System and method for measuring free volume and internal leakage of habitable area in main control room of nuclear power plant

Abstract

The present invention belongs to the technical field of habitability testing and evaluation of important habitable areas of nuclear facilities, and specifically relates to a system and method for measuring the free volume and internal leakage of the habitable area of ​​the main control room of a nuclear power plant. The system for measuring the free volume and internal leakage of the habitable area of ​​the main control room of a nuclear power plant is used to measure the free volume and internal leakage of the habitable area of ​​the main control room of the nuclear power plant through the ventilation system of the habitable area of ​​the main control room, including a tracer gas injection device for injecting tracer gas into the habitable area of ​​the main control room, and also including a tracer gas automatic sampling device for collecting and analyzing the tracer gas in the habitable area of ​​the main control room. The present invention can test the free volume of the habitable area of ​​the main control room of a nuclear power plant and evaluate the test results, and can also test the internal leakage of the habitable area of ​​the main control room of a nuclear power plant and evaluate the test results, providing a reference for the airtightness design of the habitable area of ​​the main control room under accident conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of habitability testing and evaluation of important habitable areas in nuclear power plants, and in particular relates to a system and method for measuring the free volume and internal leakage of a habitable area in a main control room of a nuclear power plant. Background Art

[0002] Important habitable areas of nuclear facilities refer to areas in nuclear facilities (such as nuclear power plants) that need to provide the necessary habitable atmospheric environment (air temperature, humidity, cleanliness, etc. meet the requirements for personnel residence) for on-duty personnel under abnormal conditions (nuclear leakage, biological and chemical attacks, etc.). Under abnormal conditions, staff on duty in important habitable areas can delay or terminate the development of abnormal conditions in nuclear facilities and reduce or eliminate the consequences of abnormal conditions. Therefore, important habitable areas are of great significance, especially the habitable area of ​​the main control room of a nuclear power plant, which is the key area among important habitable areas.

[0003] The air tightness test of the habitable area of ​​the main control room of a nuclear power plant is used to verify that the air tightness of the habitable area of ​​the main control room under accident conditions meets the design requirements. The specific technical indicator is that the leakage in the habitable area of ​​the main control room (unpurified air enters the habitable area of ​​the main control room through the pressure boundary of the habitable area of ​​the main control room under accident conditions) meets the design requirements. The tracer gas method is used to test the leakage in the habitable area of ​​the main control room. The free volume of the habitable area of ​​the main control room is an important basic parameter. At present, the main control room habitable free volume test and test result evaluation method and the internal leakage test and test result evaluation method are still blank at home and abroad, and it is necessary to design a corresponding test plan to meet this demand. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for free volume test and test result evaluation and internal leakage test and test result evaluation of the habitable area of ​​the main control room of a nuclear power plant. The device and method can be directly applied to free volume test and test result evaluation and internal leakage test and test result evaluation of the habitable area of ​​the main control room of a nuclear power plant.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is a system for measuring the free volume and internal leakage of the habitable area of ​​the main control room of a nuclear power plant, which is used to measure the free volume and internal leakage of the habitable area of ​​the main control room of the nuclear power plant through the ventilation system of the habitable area of ​​the main control room, including a tracer gas injection device for injecting tracer gas into the habitable area of ​​the main control room, and also including a tracer gas automatic sampling device for collecting and analyzing the tracer gas in the habitable area of ​​the main control room.

[0006] Furthermore, the tracer gas injection device includes a first pipeline with a gas cylinder at the top and a tail end connected to the habitable area of ​​the main control room, the gas cylinder is used to provide the tracer gas; it also includes a first air blower connected to the first pipeline through a second pipeline, and a second air blower connected to the first pipeline through a third pipeline, the second pipeline is close to the top of the first pipeline, and the third pipeline is close to the tail end of the first pipeline; it also includes a gas flow meter arranged on the first pipeline between the second pipeline and the third pipeline; the tracer gas is sulfur hexafluoride gas.

[0007] Furthermore, the tracer gas injection device further comprises:

[0008] a second valve disposed on the second pipeline;

[0009] a fifth valve disposed on the third pipeline;

[0010] A first valve and a fourth valve are arranged in series on the first pipeline between the second pipeline and the gas flow meter, wherein the first valve is close to the second pipeline and the fourth valve is close to the gas flow meter.

[0011] Furthermore, the tracer gas injection device further comprises:

[0012] A fourth pipeline having one end connected to the first pipeline, the fourth pipeline being connected to the first pipeline between the first valve and the fourth valve, and a third valve being arranged on the fourth pipeline;

[0013] Also comprising a fifth pipeline, one end of the fifth pipeline is connected to the first valve, and the other end is connected to the first pipeline between the first valve and the fourth pipeline;

[0014] The first valve is a pressure reducing valve, and the second valve, the third valve, the fourth valve and the fifth valve are manual valves.

[0015] further,

[0016] The tracer gas automatic sampling device comprises a plurality of sampling pipelines, the top ends of the sampling pipelines are connected to the sampling points in the habitable area of ​​the main control room, the tail ends of the sampling pipelines are connected to a gas sampling bag, and each of the sampling pipelines is provided with a sampling pump and a solenoid valve;

[0017] There are 40 sampling pipelines, including a first sampling pipeline, a second sampling pipeline, a third sampling pipeline, a fourth sampling pipeline, a fifth sampling pipeline and a sixth sampling pipeline;

[0018] A first sampling pump and a first solenoid valve are provided on the first sampling pipeline;

[0019] A second sampling pump and a second solenoid valve are provided on the second sampling pipeline;

[0020] The third sampling pipeline is provided with a third sampling pump and a third solenoid valve;

[0021] The fourth sampling pipeline is provided with a fourth sampling pump and a fourth solenoid valve;

[0022] The fifth sampling pipeline is provided with a fifth sampling pump and a fifth solenoid valve;

[0023] The sixth sampling pipeline is provided with a sixth sampling pump and a sixth solenoid valve.

[0024] Furthermore, the sampling pump and the solenoid valve on the sampling pipeline are both connected to the tracer gas concentration analysis device, and are controlled by the automatic control program in the tracer gas concentration analysis device to achieve automatic control start and stop; the tracer gas concentration analysis device provides two control modes of "air volume measurement sampling" and "other measurement sampling", and the air volume measurement sampling uses the first sampling pipeline, the second sampling pipeline, the third sampling pipeline, the fourth sampling pipeline, the fifth sampling pipeline and the sixth sampling pipeline.

[0025] further,

[0026] The main control room habitable area ventilation system includes a normal return air chamber, a normal supply air chamber, a normal fresh air chamber, an emergency return air chamber and an emergency supply air chamber;

[0027] The normal return air chamber is connected to one end of the habitable area of ​​the main control room through a first ventilation line, and the normal supply air chamber is connected to the other end of the habitable area of ​​the main control room through a second ventilation line; the normal return air chamber and the normal supply air chamber are connected through a third ventilation line and a fourth ventilation line, a first normal fan is provided on the third ventilation line, and a second normal fan is provided on the fourth ventilation line; and also includes a fifth ventilation line, one end of the fifth ventilation line is connected to the normal fresh air chamber, and the other end is divided into two paths, one path is connected to the third ventilation line between the normal return air chamber and the first normal fan through a sixth ventilation line, and the other path is connected to the fourth ventilation line between the normal return air chamber and the second normal fan through a seventh ventilation line;

[0028] The emergency return air chamber and the emergency supply air chamber are connected via the tenth ventilation pipeline and the eleventh ventilation pipeline; a first iodine adsorber and a first emergency blower are arranged in series on the tenth ventilation pipeline, wherein the first iodine adsorber is close to the emergency return air chamber; a second iodine adsorber and a second emergency blower are arranged in series on the eleventh ventilation pipeline, wherein the second iodine adsorber is close to the emergency return air chamber;

[0029] The emergency return air chamber is also connected to the first ventilation pipeline via an eighth ventilation pipeline, and the emergency air supply chamber is also connected to the normal return air chamber via a fifteenth ventilation pipeline;

[0030] The emergency return air chamber is also connected to the first emergency fresh air outlet via a twelfth ventilation pipeline, and connected to the second emergency fresh air outlet via a thirteenth ventilation pipeline, and the twelfth ventilation pipeline and the thirteenth ventilation pipeline are connected via a fourteenth ventilation pipeline;

[0031] A first ventilation valve is provided on the twelfth ventilation pipeline between the first emergency fresh air outlet and the fourteenth ventilation pipeline;

[0032] A second ventilation valve is provided on the thirteenth ventilation pipeline between the second emergency fresh air outlet and the fourteenth ventilation pipeline;

[0033] A third ventilation valve is provided on the eighth ventilation line;

[0034] It also includes a ninth ventilation pipeline provided with a fourth ventilation valve, wherein both ends of the ninth ventilation pipeline are connected to the eighth ventilation pipeline at both ends of the third ventilation valve;

[0035] A fifth ventilation valve and a sixth ventilation valve are arranged in series on the fifteenth ventilation pipeline, wherein the sixth ventilation valve is close to the normal return air chamber;

[0036] A seventh ventilation valve and an eighth ventilation valve are arranged in series on the first ventilation pipeline, wherein the seventh ventilation valve is close to the habitable area of ​​the main control room; the eighth ventilation pipeline is connected to the first ventilation pipeline between the seventh ventilation valve and the habitable area of ​​the main control room;

[0037] A ninth ventilation valve and a tenth ventilation valve are arranged in series on the fifth ventilation pipeline, wherein the ninth ventilation valve is close to the normal fresh air chamber;

[0038] The main control room habitable area ventilation system has three operating conditions, including normal operating conditions, emergency operating conditions and special operating conditions;

[0039] The normal operating conditions are:

[0040] One of the first normal fan and the second normal fan is in operation, and the first emergency fan and the second emergency fan are out of operation;

[0041] The first ventilation valve, the second ventilation valve, the third ventilation valve, the fourth ventilation valve, the fifth ventilation valve and the sixth ventilation valve are in a closed state;

[0042] The seventh ventilation valve, the eighth ventilation valve, the ninth ventilation valve and the tenth ventilation valve are in an open state;

[0043] The emergency operating conditions are:

[0044] One of the first normal fan and the second normal fan is in operation, and one of the first emergency fan and the second emergency fan is in operation;

[0045] The first ventilation valve, the second ventilation valve, the third ventilation valve, the fourth ventilation valve, the fifth ventilation valve and the sixth ventilation valve are in an open state;

[0046] The seventh ventilation valve, the eighth ventilation valve, the ninth ventilation valve and the tenth ventilation valve are in a closed state;

[0047] The special operating conditions:

[0048] One of the first normal fan and the second normal fan is in operation, and one of the first emergency fan and the second emergency fan is in operation;

[0049] The first ventilation valve, the second ventilation valve, the third ventilation valve, the fourth ventilation valve, the fifth ventilation valve, the sixth ventilation valve, the seventh ventilation valve and the eighth ventilation valve are in an open state;

[0050] The ninth ventilation valve and the tenth ventilation valve are in a closed state.

[0051] To achieve the above objectives, the present invention also discloses a circulating air volume measurement method using the above-mentioned nuclear power plant main control room habitable area free volume and internal leakage measurement system, comprising the following steps:

[0052] Step S1, an upstream sampling point and an injection point are set on the upstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room, and a downstream sampling point is set on the downstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room, and the injection point is located downstream of the upstream sampling point; the fourth sampling pipeline, the fifth sampling pipeline and the sixth sampling pipeline of the tracer gas automatic sampling device are connected to the upstream sampling point; the first sampling pipeline, the second sampling pipeline and the third sampling pipeline of the tracer gas automatic sampling device are connected to the downstream sampling point; the tail end of the first pipeline of the tracer gas injection device is connected to the injection point;

[0053] Step S2, pipeline purging, opening the first valve, the second valve, the third valve, the fourth valve and the fifth valve, opening the first air purge device and the second air purge device, and purging the first pipeline, the purging time is 5-10 minutes, and the purging flow rate is 50-100 ml / min;

[0054] Step S3, closing the first valve, the second valve, the third valve and the fifth valve, and keeping the fourth valve open;

[0055] Step S4, setting the required tracer gas injection flow rate on the gas flow meter;

[0056] Step S5, opening the gas cylinder and injecting the sulfur hexafluoride gas into the first pipeline;

[0057] Step S6, adjusting the first valve to a desired opening;

[0058] Step S7, after the tracer gas flow rate on the gas flow meter is stable, start the tracer gas automatic sampling device, the tracer gas injection flow rate is recorded as q, unit: ml / h; the fourth sampling pipeline, the fifth sampling pipeline and the sixth sampling pipeline are controlled by the automatic control program to start at a first start time, the first start time is recorded as T0, and the sampling time is 5s; the first sampling pipeline, the second sampling pipeline and the third sampling pipeline are controlled by the automatic control program to start at a second start time, the second start time is recorded as T1, and the sampling time is 5s, and the second start time is 1s after the first start time;

[0059] Step S8: The three sampling concentrations of the fourth sampling line, the fifth sampling line and the sixth sampling line of the upstream sampling point are C 11 , C 12 and C 13 , the average value is C1, unit: ppm; the three sampling concentrations of the first sampling line, the second sampling line and the third sampling line of the downstream sampling point are C 21 , C 22 and C 23 , the average value is C2, unit: ppm; when the C 11 , said C 12 and the C 13 The deviation of any one of them from C1 does not exceed 10%, and the C 21 , said C 22 and the C 23If the deviation of any one of them from C2 does not exceed 10%, the air volume Q used for measuring the free volume of the habitable area of ​​the main control room is Q = q / (C2-C1), unit: m 3 / h;

[0060] Step S9, if the C 11 , said C 12 and the C 13 Any deviation from C1 exceeds 10% or the C 21 , said C 22 and the C 23 If any of the above deviates from C2 by more than 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest;

[0061] Step S10, injection ends;

[0062] Step S11, closing the gas cylinder;

[0063] Step S12, closing the fourth valve;

[0064] Step S13, opening the fifth valve;

[0065] Step S14, using the second air purger to purge the first pipeline for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0066] Step S15, closing the fifth valve;

[0067] Step S16, opening the third valve;

[0068] Step S17, using the first air purger to purge the first pipeline for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0069] Step S18, closing the third valve;

[0070] Step S19, closing the first valve.

[0071] further,

[0072] In step S1,

[0073] The injection point is selected upstream of the elbow or reducer of the upstream air duct;

[0074] The position of the upstream sampling point or the position of the downstream sampling point is selected on the long straight pipe section of the upstream air duct or the downstream air duct;

[0075] The distance between the position of the upstream sampling point or the position of the downstream sampling point and the position of the injection point is ≥5D; when the long straight pipe section is a circular pipe, D refers to the diameter of the long straight pipe section; when the long straight pipe section is a square pipe, D refers to the equivalent diameter of the long straight pipe section;

[0076] When the location of the upstream sampling point or the location of the downstream sampling point is a square tube, the ports of the three sampling lines are arranged equidistantly along a horizontal straight line at the center point of the cross section of the square tube;

[0077] When the location of the upstream sampling point or the location of the downstream sampling point is a circular tube, the ports of the three sampling lines are arranged at equal distances around the center point of the cross section of the circular tube.

[0078] To achieve the above purpose, the present invention also discloses a method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant using the above-mentioned free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant, comprising the following steps:

[0079] Step S1, setting an injection point on the upstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room, and connecting the tail end of the first pipeline of the tracer gas injection device to the injection point; setting 40 sampling points in each room of the habitable area of ​​the main control room, and connecting the 40 sampling pipelines of the tracer gas automatic sampling device to the 40 sampling points one by one;

[0080] Step S2, pipeline purging, opening the first valve, the second valve, the third valve, the fourth valve and the fifth valve, opening the first air purge device and the second air purge device, and purging the first pipeline, the purging time is 5-10 minutes, and the purging flow rate is 50-100 ml / min;

[0081] Step S3, closing the first valve, the second valve, the third valve and the fifth valve, and keeping the fourth valve open;

[0082] Step S4, setting the required tracer gas injection amount on the gas flow meter;

[0083] Step S5, adjusting the ventilation system of the habitable area of ​​the main control room to a normal operating condition;

[0084] Step S6, opening the gas cylinder and injecting the sulfur hexafluoride gas into the first pipeline;

[0085] Step S7, adjusting the first valve to a desired opening;

[0086] Step S8, using a circulating air volume measurement method as described above to test the air volume of the habitable area of ​​the main control room, denoted as Q s , unit: m 3 / h

[0087] Step S9, injection ends;

[0088] Step S10, the tracer gas injection amount is read by the gas flow meter and is recorded as Q2, unit: ml;

[0089] Step S11, closing the gas cylinder;

[0090] Step S12, closing the fourth valve;

[0091] Step S13, opening the fifth valve;

[0092] Step S14, using the second air purger to purge the first pipeline for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0093] Step S15, closing the fifth valve;

[0094] Step S16, opening the third valve;

[0095] Step S17, using the first air purger to purge the first pipeline for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0096] Step S18, closing the third valve;

[0097] Step S19, closing the first valve;

[0098] Step S20: The designed volume of the habitable area of ​​the main control room is V d , unit: m 3 , after the set time, the tracer gas automatic sampling device is started to sample; the set time is V d / Q s , unit: h;

[0099] Step S21, the tracer gas concentration corresponding to the 40 sampling points is recorded as C vi , 1≤i≤40, unit: ppm, the average concentration of the 40 sampling points is C v , unit: ppm, each of the C vi With the C v The deviation does not exceed 10%, then the free volume of the habitable area of ​​the main control room V = Q s / C v , unit: m 3 ;

[0100] Step S22, if one of the C vi With the C v If the deviation exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest.

[0101] To achieve the above purpose, the present invention also discloses a measurement result evaluation method for the above-mentioned measurement method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant, comprising the following steps:

[0102] Step S1, determining the resolution δ1 of the gas flow meter; unit: ml / h;

[0103] Step S2, determine the tracer gas injection flow rate q1; unit: ml / h;

[0104] Step S3, calculating the uncertainty u(q1)=0.29δ1 of the tracer gas injection flow rate q1; unit: ml / min;

[0105] Step S4, determining the resolution δ2 of the tracer gas injection time t1; u(t1)=0.29δ2=0; unit: s;

[0106] Step S5, determining the tracer gas injection time t; unit: s;

[0107] Step S6, calculating the uncertainty of the tracer gas injection time u(t)=0; unit: s;

[0108] Step S7, calculate the tracer gas injection amount Q = q*t / 3600; unit: ml;

[0109] Step S8, calculating the uncertainty of the tracer gas injection amount Q, u(Q)=tu(q) / 3600; unit: ml;

[0110] Step S9, calculating the equilibrium concentration of the tracer gas Unit: ppm;

[0111] C vp,ij Refers to the tracer gas concentration at the jth sampling point in the i-th measurement; unit: ppm;

[0112] Step S10, determining the resolution δ3 of the tracer gas analyzer used for tracer gas analysis; unit: ppm;

[0113] Step S11, calculating the uncertainty u(C vp ,i)=0.046*δ3;Unit: ppm;

[0114] Step S12, calculating the uncertainty of the free volume of the habitable area of ​​the main control room Unit: m 3 ;

[0115] Step S13, calculating the uncertainty of n measurements of the free volume of the habitable area of ​​the main control room

[0116] Step S14, determine the t corresponding to the t distribution when the degree of freedom is (n-1) 95％ value;

[0117] Step S15, calculate the comprehensive uncertainty of n measurements of the free volume of the habitable area of ​​the main control room: U(Ve)=t95%*u(Ve); unit: m 3 ;

[0118] Step S16, draw the conclusion: the self-use volume test result Ve of the habitable area of ​​the main control room, the confidence interval [-U(Ve), U(Ve)], the confidence probability 95%; unit: m 3 .

[0119] To achieve the above purpose, the present invention also discloses a method for measuring the fresh air volume in the habitable area of ​​the main control room of a nuclear power plant, which adopts the free volume and internal leakage measurement system of the habitable area of ​​the main control room of the nuclear power plant as described above, and comprises the following steps:

[0120] Step S1, an injection point is set on the upstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room, and the tail end of the first pipeline of the tracer gas injection device is connected to the injection point; a sampling point is set on the downstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room; the first sampling pipeline, the second sampling pipeline and the third sampling pipeline of the tracer gas automatic sampling device are connected to the sampling point;

[0121] Step S2, pipeline purging, opening the first valve, the second valve, the third valve, the fourth valve and the fifth valve, opening the first air purge device and the second air purge device, and purging the first pipeline, the purging time is 5-10 minutes, and the purging flow rate is 50-100 ml / min;

[0122] Step S3, closing the first valve, the second valve, the third valve and the fifth valve, and keeping the fourth valve open;

[0123] Step S4, setting the required tracer gas injection flow rate on the gas flow meter;

[0124] Step S5, opening the gas cylinder and injecting the sulfur hexafluoride gas into the first pipeline;

[0125] Step S6, adjusting the first valve to a desired opening;

[0126] Step S7, after the tracer gas flow rate on the gas flow meter is stable, start the tracer gas automatic sampling device, the tracer gas injection flow rate is recorded as q2, unit: ml / h; the first sampling pipeline, the second sampling pipeline and the third sampling pipeline are controlled by the automatic control program to start at the same start time, the start time is recorded as T3, and the sampling time is 5s;

[0127] Step S8: The three sampling concentrations of the first sampling line, the second sampling line and the third sampling line at the sampling point are C n1 , C n2 and C n3 , whose average value is C n , unit: ppm; when the C n1 , said C n2 and the C n3 Any one of the C n The deviation does not exceed 10%, then the fresh air volume Q used for measuring the internal leakage of the habitable area of ​​the main control room is n =q2 / C n , unit: m 3 / h;

[0128] Step S9, if the C n1 , said C n2 and the C n3 Any one of the C n If the deviation exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest;

[0129] Step S10, injection ends;

[0130] Step S11, closing the gas cylinder;

[0131] Step S12, closing the fourth valve;

[0132] Step S13, opening the fifth valve;

[0133] Step S14, using the second air purger to purge the first pipeline for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0134] Step S15, closing the fifth valve;

[0135] Step S16, opening the third valve;

[0136] Step S17, using the first air purger to purge the first pipeline for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0137] Step S18, closing the third valve;

[0138] Step S19, closing the first valve.

[0139] further,

[0140] In step S1,

[0141] The injection point is selected upstream of the elbow or reducer of the upstream air duct;

[0142] The sampling point is located on the long straight section of the downstream air duct;

[0143] The interval between the sampling point and the injection point is ≥5D; when the long straight pipe section is a circular pipe, D refers to the diameter of the long straight pipe section; when the long straight pipe section is a square pipe, D refers to the equivalent diameter of the long straight pipe section;

[0144] When the sampling point is located at a square tube, the ports of the three sampling lines are arranged equidistantly along a horizontal straight line at the center point of the cross section of the square tube;

[0145] When the sampling point is located at a circular tube, the ports of the three sampling lines are arranged at equal distances around the center point of the cross section of the circular tube.

[0146] To achieve the above purpose, the present invention also discloses a method for measuring the internal leakage of the habitable area of ​​the main control room of a nuclear power plant using the free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as described above, which adopts the concentration decay method and includes the following steps:

[0147] Step S1, a tracer gas injection point is respectively set on the twelfth ventilation pipeline and the thirteenth ventilation pipeline upstream of the fan of the ventilation system of the habitable area of ​​the main control room, and the tail end of the first pipeline of the tracer gas injection device is divided into two paths connected to the two tracer gas injection points; 40 sampling points are set in each room of the habitable area of ​​the main control room, and the 40 sampling pipelines of the tracer gas automatic sampling device are connected to the 40 sampling points one by one;

[0148] Step S2, pipeline purging, opening the first valve, the second valve, the third valve, the fourth valve and the fifth valve, opening the first air purge device and the second air purge device, and purging the first pipeline, the purging time is 5-10 minutes, and the purging flow rate is 50-100 ml / min;

[0149] Step S3, closing the first valve, the second valve, the third valve and the fifth valve, and keeping the fourth valve open;

[0150] Step S4, setting the required tracer gas injection amount on the gas flow meter;

[0151] Step S5, adjusting the ventilation system of the habitable area of ​​the main control room to the special operating condition;

[0152] Step S6, opening the gas cylinder and injecting the sulfur hexafluoride gas into the first pipeline;

[0153] Step S7, adjusting the first valve to a desired opening;

[0154] Step S8, using a circulating air volume measurement method as described above, to test the circulating air volume of the habitable area of ​​the main control room, denoted as Q C , unit: m 3 / h;

[0155] Step S9, injection ends;

[0156] Step S10, the tracer gas injection amount is read by the gas flow meter and is recorded as Q3, unit: ml;

[0157] Step S11, closing the gas cylinder;

[0158] Step S12, closing the fourth valve;

[0159] Step S13, opening the fifth valve;

[0160] Step S14, using the second air purger to purge the first pipeline for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0161] Step S15, closing the fifth valve;

[0162] Step S16, opening the third valve;

[0163] Step S17, using the first air purger to purge the first pipeline for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0164] Step S18, closing the third valve;

[0165] Step S19, closing the first valve;

[0166] Step S20, testing the background concentration of the habitable area of ​​the main control room, recorded as C0, unit: ppm;

[0167] Step S21, using the above-mentioned method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant to obtain the free volume V, unit: m 3 After the first sampling time, the ventilation system of the habitable area of ​​the main control room is switched from the special operating condition to the emergency operating condition, and the automatic tracer gas sampling device is started to perform the first sampling of the 40 sampling points; the first sampling time is V / Q C , unit: h;

[0168] Step S22: In the first sampling, the first tracer gas concentration corresponding to the 40 sampling points is recorded as C 3i , 1≤i≤40, unit: ppm, the average concentration of the first tracer gas at the 40 sampling points is C3, unit: ppm, each C 3i The deviation from the stated C3 does not exceed 10%;

[0169] Step S23, a separate air volume measurement sampling point is set on the twelfth ventilation pipeline and the thirteenth ventilation pipeline upstream of the fan of the ventilation system in the habitable area of ​​the main control room, respectively, and the first sampling is performed at the two separate air volume measurement sampling points. The average value of the tracer gas concentration of the two separate air volume measurement sampling points is recorded as C b1 , unit: ppm, the C b1 The deviation from the stated C3 does not exceed 10%;

[0170] Step S24, testing the fresh air volume in the habitable area of ​​the main control room, denoted as Q n2 , unit: m 3 / h;

[0171] Step S25, setting the second sampling time for the 40 sampling points to T4 ≥ V / Q n2 , unit: h;

[0172] Step S26, in the second sampling, the second tracer gas concentration corresponding to the 40 sampling points is recorded as C 4i , 1≤i≤40, unit: ppm, the average concentration of the second tracer gas at the 40 sampling points is C4, unit: ppm, each C 4i The deviation from the stated C4 does not exceed 10%;

[0173] Step S27, a second sampling is performed at the two separate air volume measurement sampling points, and the average value of the tracer gas concentration at the two separate air volume measurement sampling points is recorded as C b2 , unit: ppm, the C b2 The deviation from the stated C4 does not exceed 10%;

[0174] Step S28, if the C3i Deviation from C3, C b1 Deviation from C3, C 4i Deviation from the C4 or the C b2 If the deviation from C4 exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest;

[0175] Step S29, calculating the ventilation rate of the habitable area of ​​the main control room: A = (lnC3-lnC4) / T4;

[0176] Step S30, calculating the internal leakage of the habitable area of ​​the main control room: Q leak =A*VQ n2 , unit: m 3 / h.

[0177] To achieve the above object, the present invention also discloses a method for evaluating measurement results using the above-mentioned method for measuring leakage in the habitable area of ​​the main control room of a nuclear power plant, comprising the following steps:

[0178] Step S1, determining the resolution δ1 of the gas flow meter; unit: ml / h;

[0179] Step S2, determining the tracer gas injection flow rate q2; unit: ml / h;

[0180] Step S3, calculating the uncertainty of the tracer gas injection flow rate q2 u(q2) = 0.29δ1; unit: ml / min;

[0181] Step S4, determining the resolution δ3 of the tracer gas analyzer; unit: ppm;

[0182] Step S5, using the steps in the fresh air volume measurement method for measuring leakage in the habitable area of ​​the main control room of a nuclear power plant as described above, calculate the tracer gas concentration C at the air volume measurement point n =(C n1 +C n2 +C n3 ) / 3; unit: ppm;

[0183] Step S6, calculating the uncertainty of the tracer gas concentration u(C n )=0.167δ2; unit: ppm;

[0184] Step S7, calculate the fresh air volume Qn = q2 / C n ; Unit: m 3 / h;

[0185] Step S8, calculate the uncertainty of the fresh air volume, Unit: m3 / h;

[0186] Step S9, determining the tracer gas sampling interval T in the habitable area of ​​the main control room; unit: h;

[0187] Step S10, calculating the uncertainty u(T) of the sampling interval time T of the tracer gas in the habitable area of ​​the main control room = 0; unit: h;

[0188] Step S11, the first tracer gas concentration corresponding to the 40 sampling points in the first sampling is recorded as C 3i The second tracer gas concentration corresponding to the 40 sampling points in the second sampling is recorded as C 4i , 1≤i≤40; unit: ppm;

[0189] Step S12, calculating the uncertainty u(C 3i )=u(C 4i )=0.29δ3; unit: ppm;

[0190] Step S13, calculating the uncertainty u(C i，3 )=u(C i，4 )=0.046*δ3; unit: ppm;

[0191] C i,3 It refers to the average concentration of tracer gas in the first sampling of the ith test, unit: ppm;

[0192] C i,4 It refers to the average concentration of tracer gas in the second sampling of the ith test, unit: ppm;

[0193] Step S14, calculating the average ventilation rate A of the habitable area of ​​the main control room i =(lnC i,3 -lnC i,4 ) / T; Unit: times / h;

[0194] Step S15, calculating the uncertainty of the average ventilation rate of the habitable area of ​​the main control room Unit: times / h;

[0195] Step S16, calculating the internal leakage Q of the habitable area of ​​the main control room i,leak =A i *VQ n2 ; Unit: m 3 / h;

[0196] Step S17, calculating the uncertainty of the internal leakage of the habitable area of ​​the main control room Unit: m3 / h;

[0197] Step S18, calculating the uncertainty of n measurements of the internal leakage in the habitable area of ​​the main control room Unit: m 3 / h;

[0198] Step S19, determine the t corresponding to the t distribution when the degree of freedom is (n-1) 95％ value;

[0199] Step S20, calculating the comprehensive uncertainty of n measurements of the internal leakage in the habitable area of ​​the main control room: U(Q e,leak ) = t 95％ *u(Q e,leak ); Unit: m 3 / h;

[0200] Step S21, draw the conclusion: the internal leakage test result Q of the habitable area of ​​the main control room is e,leak , confidence interval [-U(Q e,leak ),U(Q e,leak )], confidence probability 95%; unit: m 3 / h.

[0201] The beneficial effects of the present invention are as follows: the present invention can test the free volume of the habitable area of ​​the main control room of a nuclear power plant and evaluate the test results, and can also test the internal leakage of the habitable area of ​​the main control room of a nuclear power plant and evaluate the test results, providing a reference for the airtightness design of the habitable area of ​​the main control room under accident conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0202] Figure 1 is a schematic diagram of a ventilation system for a habitable area of ​​a main control room according to a specific embodiment of the present invention;

[0203] Figure 2 is a schematic diagram of a tracer gas injection device according to a specific embodiment of the present invention, the tracer gas injection device is arranged on the pipeline of the ventilation system of the habitable area of ​​the main control room, and also includes the first sampling pipeline to the sixth sampling pipeline of the tracer gas automatic sampling device;

[0204] Figure 3 is a schematic diagram of the automatic sampling device for tracer gas described in a specific embodiment of the present invention;

[0205] Figure 4 It is a diagram of the arrangement of sampling points inside the air duct described in a specific embodiment of the present invention;

[0206] Figure 5It is a sampling point arrangement diagram of the habitable area of ​​the main control room described in the specific embodiment of the present invention, indicating the positions of 40 sampling points used in a measurement method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant (method 2) and a measurement method for measuring the leakage in the habitable area of ​​the main control room of a nuclear power plant using a concentration decay method (method 5) (the sampling points are used to connect with the tracer gas automatic sampling device);

[0207] Figure 6 It is a schematic diagram of the tracer gas injection device described in a specific embodiment of the present invention (arranged on the pipeline of the ventilation system of the habitable area of ​​the main control room, and also includes the first sampling pipeline to the third sampling pipeline of the tracer gas automatic sampling device, used for a method for measuring the air volume in the habitable area of ​​the main control room of a nuclear power plant (method four) Equipment connection;

[0208] Figure 7 A schematic diagram of a ventilation system for a habitable area of ​​a main control room according to a specific embodiment of the present invention, in which the scope of the internal leakage measurement test (see the dotted area) is indicated, and a tracer gas injection point 136 and a separate air volume measurement sampling point 137 for a measurement method (method five) for measuring internal leakage in a habitable area of ​​a main control room of a nuclear power plant are also indicated;

[0209] In the figure: 1-gas cylinder, 2-first air purge, 3-second air purge, 4-first valve, 5-second valve, 6-third valve, 7-fourth valve, 8-fifth valve, 9-gas flow meter, 10-first pipeline, 11-second pipeline, 12-third pipeline, 13-fourth pipeline, 14-fifth pipeline, 15-first sampling pump, 16-second sampling pump, 17-third sampling pump, 18-fourth sampling pump, 19-fifth sampling pump, 20-sixth sampling pump, 21-seventh sampling pump, 22-eighth sampling pump, 23-ninth sampling pump, 24-tenth sampling pump, 25-eleventh sampling pump, 26-twelfth sampling pump, 27-thirteenth sampling pump, 28-fourteenth sampling pump, 29-fifteenth sampling pump , 30-the sixteenth sampling pump, 31-the seventeenth sampling pump, 32-the eighteenth sampling pump, 33-the nineteenth sampling pump, 34-the twentieth sampling pump, 35-the twenty-first sampling pump, 36-the twenty-second sampling pump, 37-the twenty-third sampling pump, 38-the twenty-fourth sampling pump, 39-the twenty-fifth sampling pump, 40-the twenty-sixth sampling pump, 41-the twenty-seventh sampling pump, 42-the twenty-eighth sampling pump, 43-the twenty-ninth sampling pump, 44-the thirtieth sampling pump, 45-the thirty-first sampling pump, 46-the thirty-second sampling pump, 47-the thirty-third sampling pump, 48-the thirty-fourth sampling pump, 49-the thirty-fifth sampling pump, 50-the thirty-sixth sampling pump, 51-the thirty-seventh sampling pump, 52-the thirty-eighth sampling pump, 53 - the thirty-ninth sampling pump, 54- the fortieth sampling pump, 55- the first solenoid valve, 56- the second solenoid valve, 57- the third solenoid valve, 58- the fourth solenoid valve, 59- the fifth solenoid valve, 60- the sixth solenoid valve, 61- the seventh solenoid valve, 62- the eighth solenoid valve, 63- the ninth solenoid valve, 64- the tenth solenoid valve, 65- the eleventh solenoid valve, 66- the twelfth solenoid valve, 67- the thirteenth solenoid valve, 68- the fourteenth solenoid valve, 69- the fifteenth solenoid valve, 70- the sixteenth solenoid valve, 71- the seventeenth solenoid valve, 72- the eighteenth solenoid valve, 73- the nineteenth solenoid valve, 74- the twentieth solenoid valve, 75- the twenty-first solenoid valve, 76- the twenty-second solenoid valve, 77- the twenty-third solenoid valve, 78- the twenty-fourth solenoid valve Magnetic valve, 79-the 25th solenoid valve, 80-the 26th solenoid valve, 81-the 27th solenoid valve, 82-the 28th solenoid valve, 83-the 29th solenoid valve, 84-the 30th solenoid valve, 85-the 31st solenoid valve, 86-the 32nd solenoid valve, 87-the 33rd solenoid valve, 88-the 34th solenoid valve, 89-the 35th solenoid valve, 90-the 36th solenoid valve, 91-the 37th solenoid valve, 92-the 38th solenoid valve, 93-the 39th solenoid valve, 94-the 40th solenoid valve, 95-the tracer gas concentration analysis device, 96-the gas collection bag, 97-the main control room habitable area, 98-the normal return air chamber, 99-the normal supply air chamber, 100-the normal fresh air chamber, 101-the emergency return air chamber,102-emergency air supply room, 103-first ventilation pipeline, 104-second ventilation pipeline, 105-third ventilation pipeline, 106-fourth ventilation pipeline, 107-fifth ventilation pipeline, 108-sixth ventilation pipeline, 109-seventh ventilation pipeline, 110-eighth ventilation pipeline, 111-ninth ventilation pipeline, 112-tenth ventilation pipeline, 113-eleventh ventilation pipeline, 114-twelfth ventilation pipeline, 115-thirteenth ventilation pipeline, 116-fourteenth ventilation pipeline, 117-fifteenth ventilation pipeline, 118-first normal fan, 119-second normal fan, 120-first emergency fan, 121-second emergency fan, 122-first iodine adsorber, 123-second iodine adsorber, 124-first emergency fresh air outlet, 125-second emergency fresh air outlet, 126-first ventilation valve, 127-second ventilation valve, 128-third ventilation valve, 129-fourth ventilation valve, 130-fifth ventilation valve, 131-sixth ventilation valve, 132-seventh ventilation valve, 133-eighth ventilation valve, 134-ninth ventilation valve, 135-tenth ventilation valve, 136-tracer gas injection point, 137-individual air volume measurement sampling point. DETAILED DESCRIPTION

[0210] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0211] like Figure 1 As shown, the ventilation system of the habitable area of ​​the main control room of a nuclear power plant includes a normal return air chamber 98, a normal supply air chamber 99, a normal fresh air chamber 100, an emergency return air chamber 101 and an emergency supply air chamber 102;

[0212] The normal return air chamber 98 is connected to one end of the main control room habitable area 97 through the first ventilation pipeline 103, and the normal supply air chamber 99 is connected to the other end of the main control room habitable area 97 through the second ventilation pipeline 104; the normal return air chamber 98 and the normal supply air chamber 99 are connected through the third ventilation pipeline 105 and the fourth ventilation pipeline 106, and the third ventilation pipeline 105 is provided with a first normal fan 118, and the fourth ventilation pipeline 106 is provided with a second normal fan 119; and also includes a fifth ventilation pipeline 107, one end of the fifth ventilation pipeline 107 is connected to the normal fresh air chamber 100, and the other end is divided into two paths, one path is connected to the third ventilation pipeline 105 between the normal return air chamber 98 and the first normal fan 118 through the sixth ventilation pipeline 108, and the other path is connected to the fourth ventilation pipeline 106 between the normal return air chamber 98 and the second normal fan 119 through the seventh ventilation pipeline 109;

[0213] The emergency return air chamber 101 and the emergency supply air chamber 102 are connected via the tenth ventilation pipeline 112 and the eleventh ventilation pipeline 113; the first iodine adsorber 122 and the first emergency fan 120 are arranged in series on the tenth ventilation pipeline 112, wherein the first iodine adsorber 122 is close to the emergency return air chamber 101; the second iodine adsorber 123 and the second emergency fan 121 are arranged in series on the eleventh ventilation pipeline 113, wherein the second iodine adsorber 123 is close to the emergency return air chamber 101;

[0214] The emergency return air chamber 101 is also connected to the first ventilation line 103 via the eighth ventilation line 110, and the emergency supply air chamber 102 is also connected to the normal return air chamber 98 via the fifteenth ventilation line 117;

[0215] The emergency return air chamber 101 is also connected to the first emergency fresh air outlet 124 through the twelfth ventilation pipeline 114, and connected to the second emergency fresh air outlet 125 through the thirteenth ventilation pipeline 115. The twelfth ventilation pipeline 114 and the thirteenth ventilation pipeline 115 are connected through the fourteenth ventilation pipeline 116;

[0216] A first ventilation valve 126 is provided on the twelfth ventilation line 114 between the first emergency fresh air outlet 124 and the fourteenth ventilation line 116;

[0217] A second ventilation valve 127 is provided on the thirteenth ventilation pipeline 115 between the second emergency fresh air outlet 125 and the fourteenth ventilation pipeline 116;

[0218] A third ventilation valve 128 is provided on the eighth ventilation line 110;

[0219] It also includes a ninth ventilation pipeline 111 provided with a fourth ventilation valve 129, and both ends of the ninth ventilation pipeline 111 are connected to the eighth ventilation pipeline 110 at both ends of the third ventilation valve 128;

[0220] A fifth ventilation valve 130 and a sixth ventilation valve 131 are arranged in series on the fifteenth ventilation pipeline 117, wherein the sixth ventilation valve 131 is close to the normal return air chamber 98;

[0221] A seventh ventilation valve 132 and an eighth ventilation valve 133 are arranged in series on the first ventilation pipeline 103, wherein the seventh ventilation valve 132 is close to the habitable area 97 of the main control room; the eighth ventilation pipeline 110 is connected to the first ventilation pipeline 103 between the seventh ventilation valve 132 and the habitable area 97 of the main control room;

[0222] A ninth ventilation valve 134 and a tenth ventilation valve 135 are arranged in series on the fifth ventilation pipeline 107 , wherein the ninth ventilation valve 134 is close to the normal fresh air chamber 100 .

[0223] The ventilation system of the habitable area of ​​the main control room of a nuclear power plant includes normal operating conditions, emergency operating conditions (see Table 1) and special operating conditions (see Table 2)

[0224] Table 1 Operation conditions of ventilation system in habitable area of ​​main control room

[0225]

[0226]

[0227] Table 2 Special operating conditions of the ventilation system in the habitable area of ​​the main control room (limited to the use of the concentration decay method to test the leakage in the habitable area of ​​the main control room)

[0228]

[0229] The main control room of a nuclear power plant can be used for habitable area 97, including the main control room, computer center, technical support center, safety office, study room, restaurant, locker room, toilet, corridor, morning meeting room, isolation office, duty officer's room, etc. The sampling point arrangement is detailed in Figure 5 .

[0230] A system for measuring free volume and internal leakage of habitable area in main control room of nuclear power plant

[0231] like Figure 2 and Figure 6 As shown, the present invention provides a nuclear power plant main control room habitable area free volume and internal leakage measurement system, which is used to measure the free volume and internal leakage of the main control room habitable area 97 of the nuclear power plant through the main control room habitable area ventilation system ( Figure 2 The method is used to measure the free volume. Figure 6 The system comprises a tracer gas injection device for injecting tracer gas into the habitable area 97 of the main control room, and also comprises a tracer gas automatic sampling device for collecting and analyzing the tracer gas in the habitable area 97 of the main control room.

[0232] The tracer gas injection device includes a first pipeline 10 with a gas cylinder 1 at the top and a tail end connected to the habitable area 97 of the main control room, wherein the gas cylinder 1 is used to provide tracer gas; a first air purge 2 connected to the first pipeline 10 through a second pipeline 11, and a second air purge 3 connected to the first pipeline 10 through a third pipeline 12, wherein the second pipeline 11 is close to the top of the first pipeline 10 and the third pipeline 12 is close to the tail end of the first pipeline 10; and a gas flow meter 9 arranged on the first pipeline 10 between the second pipeline 11 and the third pipeline 12, which is used to record the amount of tracer gas injected. The tracer gas is sulfur hexafluoride gas.

[0233] The tracer gas injection device also includes:

[0234] A second valve 5 disposed on the second pipeline 11;

[0235] a fifth valve 8 disposed on the third pipeline 12;

[0236] The first valve 4 and the fourth valve 7 are arranged in series on the first pipeline 10 between the second pipeline 11 and the gas flow meter 9 , the first valve 4 is close to the second pipeline 11 , and the fourth valve 7 is close to the gas flow meter 9 .

[0237] The tracer gas injection device also includes:

[0238] A fourth pipeline 13 having one end connected to the first pipeline 10, the fourth pipeline 13 is connected to the first pipeline 10 between the first valve 4 and the fourth valve 7, and the fourth pipeline 13 is provided with a third valve 6;

[0239] The fifth pipeline 14 is also included, one end of the fifth pipeline 14 is connected to the first valve 4, and the other end is connected to the first pipeline 10 between the first valve 4 and the fourth pipeline 13;

[0240] The first valve 4 is a pressure reducing valve, and the second valve 5, the third valve 6, the fourth valve 7 and the fifth valve 8 are manual valves.

[0241] The tracer gas automatic sampling device includes a plurality of sampling pipelines, the top ends of the sampling pipelines are connected to the sampling points of the habitable area 97 of the main control room, the tail ends of the sampling pipelines are connected to a gas sampling bag 96, and a sampling pump and a solenoid valve are arranged on each sampling pipeline;

[0242] There are 40 sampling pipelines, including a first sampling pipeline, a second sampling pipeline, a third sampling pipeline, a fourth sampling pipeline, a fifth sampling pipeline and a sixth sampling pipeline;

[0243] A first sampling pump 15 and a first solenoid valve 55 are provided on the first sampling pipeline;

[0244] A second sampling pump 16 and a second solenoid valve 56 are provided on the second sampling pipeline;

[0245] A third sampling pump 17 and a third solenoid valve 57 are provided on the third sampling pipeline;

[0246] A fourth sampling pump 18 and a fourth solenoid valve 58 are provided on the fourth sampling pipeline;

[0247] A fifth sampling pump 19 and a fifth solenoid valve 59 are provided on the fifth sampling pipeline;

[0248] A sixth sampling pump 20 and a sixth solenoid valve 60 are provided on the sixth sampling pipeline.

[0249] like Figure 3As shown, the sampling pump and the solenoid valve on the sampling pipeline are connected to the tracer gas concentration analysis device 95, and are controlled by the automatic control program in the tracer gas concentration analysis device 95 to realize automatic control start and stop; the tracer gas concentration analysis device 95 provides two control modes of "air volume measurement sampling" and "other measurement sampling", and the air volume measurement sampling uses the first sampling pipeline, the second sampling pipeline, the third sampling pipeline, the fourth sampling pipeline, the fifth sampling pipeline and the sixth sampling pipeline.

[0250] Method 1: A circulating air volume measurement method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant

[0251] The present invention also discloses a method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant, which adopts the above-mentioned free volume and internal leakage measurement system of the habitable area of ​​the main control room of the nuclear power plant, and comprises the following steps:

[0252] Step S1, such as Figure 2 As shown, an upstream sampling point and an injection point are set in the upstream air duct of the fan of the ventilation system in the habitable area of ​​the main control room, and a downstream sampling point is set in the downstream air duct of the fan of the ventilation system in the habitable area of ​​the main control room, and the injection point is located downstream of the upstream sampling point (the injection point is closer to the fan than the upstream sampling point); the fourth sampling line, the fifth sampling line and the sixth sampling line of the automatic sampling device of the tracer gas are connected to the upstream sampling point; the first sampling line, the second sampling line and the third sampling line of the automatic sampling device of the tracer gas are connected to the downstream sampling point; the tail end of the first pipeline 10 of the tracer gas injection device is connected to the injection point;

[0253] The injection point is selected at the elbow or reducer upstream of the upstream air duct to facilitate the diffusion and mixing of the tracer gas;

[0254] The location of the upstream sampling point or the downstream sampling point is selected on the long straight pipe section of the upstream air duct or the downstream air duct;

[0255] The distance between the upstream sampling point or the downstream sampling point and the injection point is ≥5D; when the long straight pipe section is a circular pipe, D refers to the diameter of the long straight pipe section; when the long straight pipe section is a square pipe, D refers to the equivalent diameter of the long straight pipe section;

[0256] like Figure 4 As shown, when the location of the upstream sampling point or the location of the downstream sampling point is a square tube, the ports of the three sampling lines are arranged at equal distances along a horizontal straight line at the center point of the cross section of the square tube;

[0257] like Figure 4 As shown, when the location of the upstream sampling point or the location of the downstream sampling point is a circular tube, the ports of the three sampling lines are arranged around the center point of the cross section of the circular tube at equal distances;

[0258] Step S2, pipeline purging, open the first valve 4, the second valve 5, the third valve 6, the fourth valve 7 and the fifth valve 8, open the first air purge 2 and the second air purge 3, purge the first pipeline 10 (injection pipeline), the purge time is 5-10min, and the purge flow rate is 50-100ml / min;

[0259] Step S3, closing the first valve 4, the second valve 5, the third valve 6 and the fifth valve 8, and keeping the fourth valve 7 open;

[0260] Step S4, setting the required tracer gas injection flow rate on the gas flow meter 9;

[0261] Step S5, opening the gas cylinder 1 and injecting sulfur hexafluoride gas into the first pipeline 10;

[0262] Step S6, adjusting the first valve 4 to a desired opening;

[0263] Step S7, after the tracer gas flow rate on the gas flow meter 9 is stable, start the tracer gas automatic sampling device, the tracer gas injection flow rate is recorded as q, unit: ml / h; the fourth sampling line, the fifth sampling line and the sixth sampling line are controlled by the automatic control program to start at the first start time, the first start time is recorded as T0, and the sampling time is 5s; the first sampling line, the second sampling line and the third sampling line are controlled by the automatic control program to start at the second start time, the second start time is recorded as T1, the sampling time is 5s, and the second start time is 1s after the first start time;

[0264] Step S8: The three sampling concentrations of the fourth sampling line, the fifth sampling line and the sixth sampling line of the upstream sampling point are C 11 , C 12 and C 13 , the average value is C1, unit: ppm; the three sampling concentrations of the first sampling pipeline, the second sampling pipeline and the third sampling pipeline of the downstream sampling point are C 21 , C 22 and C 23 , the average value is C2, unit: ppm; when C 11 , C 12 and C 13 The deviation of any of them from C1 does not exceed 10%, and C 21 , C 22 and C 23 If the deviation between any one of them and C2 does not exceed 10%, the air volume Q used to measure the free volume of the habitable area 97 of the main control room is Q = q / (C2-C1), unit: m 3 / h;

[0265] Step S9, if C11 , C 12 and C 13 Any deviation from C1 exceeds 10% or C 21 , C 22 and C 23 If the deviation between any one of the above and C2 exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest.

[0266] Step S10, injection ends;

[0267] Step S11, closing gas cylinder 1;

[0268] Step S12, closing the fourth valve 7;

[0269] Step S13, opening the fifth valve 8;

[0270] Step S14, using the second air purge device 3 to purge the first pipeline 10 for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0271] Step S15, closing the fifth valve 8;

[0272] Step S16, opening the third valve 6;

[0273] Step S17, using the first air purge device 2 to purge the first pipeline 10 for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0274] Step S18, closing the third valve 6;

[0275] Step S19, closing the first valve 4.

[0276] Method 2: A measurement method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant

[0277] The present invention also discloses a method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant using the above-mentioned free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant, comprising the following steps:

[0278] Step S1, an injection point is set in the upstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room, and the tail end of the first pipeline 10 of the tracer gas injection device is connected to the injection point (i.e. Figure 2 The tracer gas injection device in the Figure 5 As shown, 40 sampling points are set in each room of the habitable area 97 of the main control room, and 40 sampling lines of the tracer gas automatic sampling device are connected to the 40 sampling points one by one;

[0279] Step S2, pipeline purging, open the first valve 4, the second valve 5, the third valve 6, the fourth valve 7 and the fifth valve 8, open the first air purge 2 and the second air purge 3, purge the first pipeline 10, the purge time is 5-10min, and the purge flow rate is 50-100ml / min;

[0280] Step S3, closing the first valve 4, the second valve 5, the third valve 6 and the fifth valve 8, and keeping the fourth valve 7 open;

[0281] Step S4, setting the required tracer gas injection amount on the gas flow meter 9;

[0282] Step S5, according to Table 1, adjusting the ventilation system of the habitable area of ​​the main control room to a normal operating condition;

[0283] Step S6, opening the gas cylinder 1 and injecting sulfur hexafluoride gas into the first pipeline 10;

[0284] Step S7, adjusting the first valve 4 to a desired opening;

[0285] Step S8, using a circulating air volume measurement method as described above to test the air volume of the habitable area 97 of the main control room, denoted as Q s , unit: m 3 / h;

[0286] Step S9, injection ends;

[0287] Step S10, the tracer gas injection amount is read by the gas flow meter 9, recorded as Q2, unit: ml;

[0288] Step S11, closing gas cylinder 1;

[0289] Step S12, closing the fourth valve 7;

[0290] Step S13, opening the fifth valve 8;

[0291] Step S14, using the second air purge device 3 to purge the first pipeline 10 for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0292] Step S15, closing the fifth valve 8;

[0293] Step S16, opening the third valve 6;

[0294] Step S17, using the first air purge device 2 to purge the first pipeline 10 for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0295] Step S18, closing the third valve 6;

[0296] Step S19, closing the first valve 4;

[0297] Step S20: The designed volume of the habitable area 97 of the main control room is V d , unit: m 3 , after the set time, start the tracer gas automatic sampling device to take samples; the set time is V d / Q s , unit: h;

[0298] Step S21, the tracer gas concentration corresponding to the 40 sampling points is recorded as C vi , 1≤i≤40, unit: ppm, the average concentration of 40 sampling points is C v , unit: ppm, each C vi With C v The deviation does not exceed 10%, then the free volume V of the habitable area 97 of the main control room is Q s / C v , unit: m 3 ;

[0299] Step S22, if a C vi With C v If the deviation exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest.

[0300] Method 3: A method for evaluating the free volume measurement results of the habitable area of ​​the main control room of a nuclear power plant

[0301] The present invention also discloses a method for evaluating measurement results using the above-mentioned method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant, comprising the following steps:

[0302] Step S1, determine the resolution δ1 of the gas flow meter 9; unit: ml / h;

[0303] Step S2, determining the tracer gas injection flow rate q1; unit: ml / h;

[0304] Step S3, calculating the uncertainty of the tracer gas injection flow rate q1 u(q1) = 0.29δ1; unit: ml / min;

[0305] Step S4, determining the resolution δ2 of the tracer gas injection time t1; u(t1)=0.29δ2=0; unit: s;

[0306] Step S5, determining the tracer gas injection time t; unit: s;

[0307] Step S6, calculating the uncertainty of the tracer gas injection time u(t)=0; unit: s;

[0308] Step S7, calculate the tracer gas injection amount Q = q*t / 3600; unit: ml;

[0309] Step S8, calculating the uncertainty of the tracer gas injection amount Q u(Q) = tu(q) / 3600; unit: ml;

[0310] Step S9, calculating the equilibrium concentration of tracer gas Unit: ppm;

[0311] C vp,ij Refers to the tracer gas concentration at the jth sampling point (40 sampling points in total) in the i-th measurement (n measurements in total); unit: ppm;

[0312] Step S10, determining the resolution δ3 of the tracer gas analyzer; unit: ppm;

[0313] Step S11, calculating the uncertainty u(C vp ,i)=0.046*δ3;Unit: ppm;

[0314] Step S12, uncertainty of the free volume of the habitable area 97 of the main control room Unit: m 3 ;

[0315] Step S13, calculating the uncertainty of n measurements of the free volume of the habitable area 97 of the main control room

[0316] Step S14, determine the t corresponding to the t distribution when the degree of freedom is (n-1) 95％ value;

[0317] Step S15, calculate the comprehensive uncertainty of n measurements of the free volume of the habitable area of ​​the main control room: U(Ve)=t95%*u(Ve); unit: m 3 ;

[0318] Step S16, conclusion: the test result of the self-use volume of the habitable area of ​​the main control room Ve, confidence interval [-U(Ve), U(Ve)], confidence probability 95%; unit: m 3 .

[0319] Method 4: A fresh air volume measurement method for measuring leakage in the habitable area of ​​the main control room of a nuclear power plant

[0320] The present invention also discloses a method for measuring the internal leakage of the habitable area of ​​the main control room of a nuclear power plant, which adopts the free volume and internal leakage measurement system of the habitable area of ​​the main control room of the nuclear power plant as described above, and comprises the following steps:

[0321] Step S1, such as Figure 6As shown in the figure, an injection point is set in the upstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room (at Figure 7 The tail end of the first pipeline 10 of the tracer gas injection device is connected to the injection point; a sampling point ( Figure 6 The sampling points in Figure 7 The first sampling line, the second sampling line and the third sampling line of the tracer gas automatic sampling device are connected to the sampling point;

[0322] The injection point is selected at the elbow or reducer upstream of the upstream air duct to facilitate the diffusion and mixing of the tracer gas;

[0323] The sampling point is selected on the long straight section of the downstream air duct;

[0324] The interval between the sampling point and the injection point is ≥5D; when the long straight pipe section is a circular pipe, D refers to the diameter of the long straight pipe section; when the long straight pipe section is a square pipe, D refers to the equivalent diameter of the long straight pipe section;

[0325] like Figure 4 As shown, when the sampling point is located at a square tube, the ports of the three sampling lines are arranged at equal distances along a horizontal straight line at the center point of the cross section of the square tube;

[0326] like Figure 4 As shown, when the sampling point is located at a circular tube, the ports of the three sampling lines are arranged at equal distances around the center point of the cross section of the circular tube.

[0327] Step S2, pipeline purging, open the first valve 4, the second valve 5, the third valve 6, the fourth valve 7 and the fifth valve 8, open the first air purge 2 and the second air purge 3, purge the first pipeline 10, the purge time is 5-10min, and the purge flow rate is 50-100ml / min;

[0328] Step S3, closing the first valve 4, the second valve 5, the third valve 6 and the fifth valve 8, and keeping the fourth valve 7 open;

[0329] Step S4, setting the required tracer gas injection flow rate on the gas flow meter 9;

[0330] Step S5, opening the gas cylinder 1 and injecting sulfur hexafluoride gas into the first pipeline 10;

[0331] Step S6, adjusting the first valve 4 to a desired opening;

[0332] Step S7, after the tracer gas flow rate on the gas flow meter 9 is stable, start the tracer gas automatic sampling device, the tracer gas injection flow rate is recorded as q2, unit: ml / h; the first sampling pipeline, the second sampling pipeline and the third sampling pipeline are controlled by the automatic control program to start at the same start time, the start time is recorded as T3, and the sampling time is 5s;

[0333] Step S8: The three sampling concentrations of the first sampling line, the second sampling line and the third sampling line at the sampling point are C n1 , C n2 and C n3 , whose average value is C n , unit: ppm; when C n1 , C n2 and C n3 Any one of C n If the deviation does not exceed 10%, the air volume Q used for measuring the internal leakage of the habitable area 97 of the main control room n =q2 / C n , unit: m 3 / h;

[0334] Step S9, if C n1 , C n2 and C n3 Any one of C n If the deviation exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest;

[0335] Step S10, injection ends;

[0336] Step S11, closing gas cylinder 1;

[0337] Step S12, closing the fourth valve 7;

[0338] Step S13, opening the fifth valve 8;

[0339] Step S14, using the second air purge device 3 to purge the first pipeline 10 for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0340] Step S15, closing the fifth valve 8;

[0341] Step S16, opening the third valve 6;

[0342] Step S17, using the first air purge device 2 to purge the first pipeline 10 for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0343] Step S18, closing the third valve 6;

[0344] Step S19, closing the first valve 4.

[0345] Method 5: A method for measuring leakage in the habitable area of ​​the main control room of a nuclear power plant

[0346] The present invention also discloses a method for measuring the internal leakage of the habitable area of ​​the main control room of a nuclear power plant using the free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as described above, which adopts the concentration decay method and includes the following steps:

[0347] Step S1, such as Figure 7 As shown, a tracer gas injection point 136 is respectively set on the twelfth ventilation pipeline 114 and the thirteenth ventilation pipeline 115 upstream of the fan of the ventilation system in the habitable area of ​​the main control room, and the tail end of the first pipeline 10 of the tracer gas injection device is divided into two paths connected to the two tracer gas injection points 136; Figure 5 As shown, 40 sampling points are set in each room of the habitable area 97 of the main control room, and 40 sampling lines of the tracer gas automatic sampling device are connected to the 40 sampling points one by one;

[0348] Step S2, pipeline purging, open the first valve 4, the second valve 5, the third valve 6, the fourth valve 7 and the fifth valve 8, open the first air purge 2 and the second air purge 3, purge the first pipeline 10, the purge time is 5-10min, and the purge flow rate is 50-100ml / min;

[0349] Step S3, closing the first valve 4, the second valve 5, the third valve 6 and the fifth valve 8, and keeping the fourth valve 7 open;

[0350] Step S4, setting the required tracer gas injection amount on the gas flow meter 9;

[0351] Step S5, adjusting the ventilation system of the habitable area of ​​the main control room to a special operating condition (see Table 2);

[0352] Step S6, opening the gas cylinder 1 and injecting sulfur hexafluoride gas into the first pipeline 10;

[0353] Step S7, adjusting the first valve 4 to a desired opening;

[0354] Step S8, testing the circulating air volume in the habitable area of ​​the main control room, denoted as Q C , unit: m 3 / h

[0355] Step S9, injection ends;

[0356] Step S10, the tracer gas injection amount is read by the gas flow meter 9, recorded as Q3, unit: ml;

[0357] Step S11, closing gas cylinder 1;

[0358] Step S12, closing the fourth valve 7;

[0359] Step S13, opening the fifth valve 8;

[0360] Step S14, using the second air purge device 3 to purge the first pipeline 10 for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0361] Step S15, closing the fifth valve 8;

[0362] Step S16, opening the third valve 6;

[0363] Step S17, using the first air purge device 2 to purge the first pipeline 10 for 3-5 minutes, with a purge flow rate of 50-100 ml / min;

[0364] Step S18, closing the third valve 6;

[0365] Step S19, closing the first valve 4;

[0366] Step S20, testing the background concentration in the habitable area of ​​the main control room, recorded as C0, unit: ppm;

[0367] Step S21, using the above-mentioned method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant to obtain the free volume V, unit: m 3 After the first sampling time, the ventilation system in the habitable area of ​​the main control room is switched from the special operating conditions in Table 2 to the emergency operating conditions in Table 1, and the automatic sampling device for tracer gas is started to perform the first sampling of 40 sampling points; the first sampling time is V / Q C , unit: h;

[0368] Step S22, the first tracer gas concentration corresponding to the 40 sampling points is recorded as C 3i , 1≤i≤40, unit: ppm, the average concentration of the first tracer gas at the 40 sampling points is C3, unit: ppm, each C 3i The deviation from C3 does not exceed 10%;

[0369] Step S23, as Figure 7 As shown in FIG. 1 , a separate air volume measurement sampling point 137 is respectively set on the twelfth ventilation pipeline 114 and the thirteenth ventilation pipeline 115 upstream of the fan of the ventilation system in the habitable area of ​​the main control room. The first sampling (separate sampling, not through the tracer gas automatic sampling device) is performed at the two separate air volume measurement sampling points 137. The average value of the tracer gas concentration of the two separate air volume measurement sampling points 137 is recorded as C b1 , unit: ppm, C b1The deviation from C3 does not exceed 10%;

[0370] Step S24, testing the fresh air volume in the habitable area of ​​the main control room, denoted as Q n2 , unit: m 3 / h;

[0371] Step S25, set the second sampling time for 40 sampling points to T4 ≥ V / Q n2 , unit: h;

[0372] Step S26, the second tracer gas concentration corresponding to the 40 sampling points is recorded as C 4i , 1≤i≤40, unit: ppm, the average concentration of the second tracer gas at 40 sampling points is C4, unit: ppm, each C 4i The deviation from C4 does not exceed 10%;

[0373] Step S27, as Figure 7 As shown, a second sampling is performed at two separate air volume measurement sampling points 137 (separate sampling, not by the tracer gas automatic sampling device), and the average value of the tracer gas concentration at the two separate air volume measurement sampling points 137 is recorded as C b2 , unit: ppm, C b2 The deviation from C4 does not exceed 10%;

[0374] Step S28, if C 3i Deviation from C3, C b1 Deviation from C3, C 4i Deviation from C4 or C b2 If the deviation from C4 exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest;

[0375] Step S29, calculating the ventilation rate of the habitable area 97 of the main control room: A = (lnC3-lnC4) / T4;

[0376] Step S30, calculate the internal leakage of the habitable area 97 of the main control room: Q leak =A*VQ n2 , unit: m 3 / h;

[0377] Step S31, repeat the test n times, n≥1, calculate the internal leakage of the habitable area 97 of the main control room respectively, and the average value is taken as the final test result.

[0378] Method 6: A measurement result evaluation method

[0379] The present invention also discloses a measurement result evaluation method for the above-mentioned method for measuring leakage in the habitable area of ​​the main control room of a nuclear power plant (based on the concentration decay method), comprising the following steps:

[0380] Step S1, determine the resolution δ1 of the gas flow meter 9; unit: ml / h;

[0381] Step S2, determining the tracer gas injection flow rate q2; unit: ml / h;

[0382] Step S3, calculating the uncertainty of the tracer gas injection flow rate q2 u(q2) = 0.29δ1; unit: ml / min;

[0383] Step S4, determining the resolution δ3 of the tracer gas analyzer; unit: ppm;

[0384] Step S5, using the steps in the fresh air volume measurement method for measuring leakage in the habitable area of ​​the main control room of a nuclear power plant as described above (specifically in step S8 of the method), calculate the tracer gas concentration C at the air volume measurement point n =(C n1 +C n2 +C n3 ) / 3; unit: ppm;

[0385] Step S6, calculate the uncertainty of the tracer gas concentration u(C n )=0.167δ2; Unit: ppm; (“air volume measurement point” is a sampling point in step S1 of a new air volume measurement method for measuring leakage in the habitable area of ​​a nuclear power plant main control room)

[0386] Step S7, calculate the fresh air volume Qn = q2 / C n ; Unit: m 3 / h;

[0387] Step S8, calculate the uncertainty of the fresh air volume, u(Q n )=√(1 / C n ) 2 u 2 (q)+(-q / C n 2 ) 2 u 2 (C n ), unit: m 3 / h;

[0388] Step S9, determining the tracer gas sampling interval T in the habitable area of ​​the main control room; unit: h;

[0389] Step S10, calculating the uncertainty u(T) of the sampling interval time T of the tracer gas in the habitable area of ​​the main control room = 0, the calculation software timing, this value can be considered as 0; unit; h;

[0390] Step S11: The first tracer gas concentration corresponding to the 40 sampling points in the first sampling is recorded as C 3i The second tracer gas concentration corresponding to the 40 sampling points in the second sampling is recorded as C 4i , 1≤i≤40; unit: ppm;

[0391] Step S12, calculate the uncertainty u(C 3i )=u(C 4i )=0.29δ3; unit: ppm;

[0392] Step S13, calculating the uncertainty u(C i,3 )=u(C i,4 )=0.046*δ3; unit: ppm;

[0393] C i,3 It refers to the average concentration of the tracer gas sampled for the first time in the i-th test (a total of n tests are performed), unit: ppm;

[0394] C i,4 It refers to the average concentration of tracer gas in the second sampling of the ith test (a total of n tests are performed), unit: ppm;

[0395] Step S14, calculate the average ventilation rate A of the habitable area 97 of the main control room i =(lnC i,3 -lnC i,4 ) / T; Unit: times / h;

[0396] Step S15, calculating the uncertainty of the average ventilation rate of the habitable area 97 of the main control room Unit: times / h;

[0397] Step S16, calculate the internal leakage Q of the habitable area 97 of the main control room i,leak =A i *VQ n2 ; Unit: m 3 / h;

[0398] Step S17, calculate the uncertainty of the internal leakage of the habitable area 97 of the main control room Unit: m 3 / h;

[0399] Step S19, calculate the uncertainty of n measurements of the internal leakage of the habitable area 97 of the main control room Unit: m 3 / h;

[0400] Step S20, determining the t corresponding to the t distribution when the degree of freedom is (n-1)95％ value;

[0401] Step S21, calculate the combined uncertainty of n measurements of the internal leakage of the habitable area 97 of the main control room: U(Q e,leak ) = t 95％ *u(Q e,leak ); Unit: m 3 / h;

[0402] Step S22, conclusion: the internal leakage test result Q of the habitable area 97 of the main control room e,leak , confidence interval [-U(Q e,leak ),U(Q e,leak )], confidence probability 95%; unit: m 3 / h.

[0403] The device described in the present invention is not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the technical innovation scope of the present invention.

Claims

1. A system for measuring the free volume and internal leakage of the habitable area of ​​a nuclear power plant main control room, characterized by: Used to measure the free volume and internal leakage of the habitable area (97) of the main control room of a nuclear power plant through the main control room habitable area ventilation system, comprising a tracer gas injection device for injecting tracer gas into the habitable area (97) of the main control room, and also comprising a tracer gas automatic sampling device for collecting and analyzing the tracer gas in the habitable area (97) of the main control room; The main control room habitable area ventilation system comprises a normal return air chamber (98), a normal supply air chamber (99), a normal fresh air chamber (100), an emergency return air chamber (101) and an emergency supply air chamber (102); The normal return air chamber (98) is connected to one end of the main control room habitable area (97) through a first ventilation pipeline (103), and the normal supply air chamber (99) is connected to the other end of the main control room habitable area (97) through a second ventilation pipeline (104); the normal return air chamber (98) and the normal supply air chamber (99) are connected through a third ventilation pipeline (105) and a fourth ventilation pipeline (106), wherein the third ventilation pipeline (105) is provided with a first normal fan (118), and the fourth ventilation pipeline (106) is provided with a second normal fan (119). The invention also comprises a fifth ventilation pipeline (107), one end of which is connected to the normal fresh air chamber (100), and the other end of which is divided into two paths, one of which is connected to the third ventilation pipeline (105) between the normal return air chamber (98) and the first normal fan (118) through a sixth ventilation pipeline (108), and the other of which is connected to the fourth ventilation pipeline (106) between the normal return air chamber (98) and the second normal fan (119) through a seventh ventilation pipeline (109); The emergency return air chamber (101) and the emergency supply air chamber (102) are connected via a tenth ventilation pipeline (112) and an eleventh ventilation pipeline (113); a first iodine adsorber (122) and a first emergency fan (120) are arranged in series on the tenth ventilation pipeline (112), wherein the first iodine adsorber (122) is close to the emergency return air chamber (101); a second iodine adsorber (123) and a second emergency fan (121) are arranged in series on the eleventh ventilation pipeline (113), wherein the second iodine adsorber (123) is close to the emergency return air chamber (101); The emergency return air chamber (101) is also connected to the first ventilation pipeline (103) via an eighth ventilation pipeline (110), and the emergency air supply chamber (102) is also connected to the normal return air chamber (98) via a fifteenth ventilation pipeline (117); The emergency return air chamber (101) is also connected to the first emergency fresh air outlet (124) via a twelfth ventilation pipeline (114), and is connected to the second emergency fresh air outlet (125) via a thirteenth ventilation pipeline (115); the twelfth ventilation pipeline (114) and the thirteenth ventilation pipeline (115) are connected via a fourteenth ventilation pipeline (116); A first ventilation valve (126) is provided on the twelfth ventilation pipeline (114) between the first emergency fresh air outlet (124) and the fourteenth ventilation pipeline (116); A second ventilation valve (127) is provided on the thirteenth ventilation pipeline (115) between the second emergency fresh air outlet (125) and the fourteenth ventilation pipeline (116); A third ventilation valve (128) is provided on the eighth ventilation line (110); It also includes a ninth ventilation pipeline (111) provided with a fourth ventilation valve (129), and two ends of the ninth ventilation pipeline (111) are connected to the eighth ventilation pipeline (110) at two ends of the third ventilation valve (128); A fifth ventilation valve (130) and a sixth ventilation valve (131) are arranged in series on the fifteenth ventilation pipeline (117), wherein the sixth ventilation valve (131) is close to the normal return air chamber (98); A seventh ventilation valve (132) and an eighth ventilation valve (133) are arranged in series on the first ventilation pipeline (103), wherein the seventh ventilation valve (132) is close to the habitable area (97) of the main control room; the eighth ventilation pipeline (110) is connected to the first ventilation pipeline (103) between the seventh ventilation valve (132) and the habitable area (97) of the main control room; A ninth ventilation valve (134) and a tenth ventilation valve (135) are arranged in series on the fifth ventilation pipeline (107), wherein the ninth ventilation valve (134) is close to the normal fresh air chamber (100); The main control room habitable area ventilation system has three operating conditions, including normal operating conditions, emergency operating conditions and special operating conditions; The normal operating conditions are: One of the first normal fan (118) and the second normal fan (119) is in operation, and the first emergency fan (120) and the second emergency fan (121) are out of operation; The first ventilation valve (126), the second ventilation valve (127), the third ventilation valve (128), the fourth ventilation valve (129), the fifth ventilation valve (130) and the sixth ventilation valve (131) are in a closed state; The seventh ventilation valve (132), the eighth ventilation valve (133), the ninth ventilation valve (134) and the tenth ventilation valve (135) are in an open state; The emergency operating conditions are: One of the first normal fan (118) and the second normal fan (119) is in operation, and one of the first emergency fan (120) and the second emergency fan (121) is in operation; The first ventilation valve (126), the second ventilation valve (127), the third ventilation valve (128), the fourth ventilation valve (129), the fifth ventilation valve (130) and the sixth ventilation valve (131) are in an open state; The seventh ventilation valve (132), the eighth ventilation valve (133), the ninth ventilation valve (134) and the tenth ventilation valve (135) are in a closed state; The special operating conditions: One of the first normal fan (118) and the second normal fan (119) is in operation, and one of the first emergency fan (120) and the second emergency fan (121) is in operation; The first ventilation valve (126), the second ventilation valve (127), the third ventilation valve (128), the fourth ventilation valve (129), the fifth ventilation valve (130), the sixth ventilation valve (131), the seventh ventilation valve (132) and the eighth ventilation valve (133) are in an open state; The ninth ventilation valve (134) and the tenth ventilation valve (135) are in a closed state.

2. The free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as claimed in claim 1, characterized in that: The tracer gas injection device comprises a first pipeline (10) with a gas cylinder (1) at the top and a tail end connected to the habitable area (97) of the main control room, wherein the gas cylinder (1) is used to provide the tracer gas; it also comprises a first air purge (2) connected to the first pipeline (10) through a second pipeline (11), and a second air purge (3) connected to the first pipeline (10) through a third pipeline (12), wherein the second pipeline (11) is close to the top of the first pipeline (10), and the third pipeline (12) is close to the tail end of the first pipeline (10); it also comprises a gas flow meter (9) arranged on the first pipeline (10) between the second pipeline (11) and the third pipeline (12); the tracer gas is sulfur hexafluoride gas.

3. The free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as claimed in claim 2, characterized in that: The tracer gas injection device also includes: a second valve (5) disposed on the second pipeline (11); a fifth valve (8) disposed on the third pipeline (12); A first valve (4) and a fourth valve (7) are arranged in series on the first pipeline (10) between the second pipeline (11) and the gas flow meter (9), wherein the first valve (4) is close to the second pipeline (11) and the fourth valve (7) is close to the gas flow meter (9).

4. The free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as claimed in claim 3, characterized in that: The tracer gas injection device also includes: a fourth pipeline (13) having one end connected to the first pipeline (10), the fourth pipeline (13) being connected to the first pipeline (10) between the first valve (4) and the fourth valve (7), and a third valve (6) being provided on the fourth pipeline (13); It also includes a fifth pipeline (14), one end of which is connected to the first valve (4), and the other end of which is connected to the first pipeline (10) between the first valve (4) and the fourth pipeline (13); The first valve (4) is a pressure reducing valve, and the second valve (5), the third valve (6), the fourth valve (7) and the fifth valve (8) are manual valves.

5. The free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as claimed in claim 4, characterized in that: The tracer gas automatic sampling device comprises a plurality of sampling pipelines, the top ends of the sampling pipelines are connected to the sampling points of the habitable area (97) of the main control room, the tail ends of the sampling pipelines are connected to a gas sampling bag (96), and each of the sampling pipelines is provided with a sampling pump and a solenoid valve; There are 40 sampling pipelines, including a first sampling pipeline, a second sampling pipeline, a third sampling pipeline, a fourth sampling pipeline, a fifth sampling pipeline and a sixth sampling pipeline; The first sampling pipeline is provided with a first sampling pump (15) and a first solenoid valve (55); The second sampling pipeline is provided with a second sampling pump (16) and a second solenoid valve (56); The third sampling pipeline is provided with a third sampling pump (17) and a third solenoid valve (57); The fourth sampling pipeline is provided with a fourth sampling pump (18) and a fourth solenoid valve (58); The fifth sampling pipeline is provided with a fifth sampling pump (19) and a fifth solenoid valve (59); The sixth sampling pipeline is provided with a sixth sampling pump (20) and a sixth solenoid valve (60).

6. The free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as claimed in claim 5, characterized in that: The sampling pump and the electromagnetic valve on the sampling pipeline are both connected to a tracer gas concentration analysis device (95), and are controlled by an automatic control program in the tracer gas concentration analysis device (95) to realize automatic control start and stop; the tracer gas concentration analysis device (95) provides two control modes, namely "air volume measurement sampling" and "other measurement sampling", and the air volume measurement sampling uses the first sampling pipeline, the second sampling pipeline, the third sampling pipeline, the fourth sampling pipeline, the fifth sampling pipeline and the sixth sampling pipeline.

7. A circulating air volume measurement method using the free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as claimed in claim 6, comprising the following steps: Step S1, an upstream sampling point and an injection point are set on the upstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room, and a downstream sampling point is set on the downstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room, and the injection point is located downstream of the upstream sampling point; the fourth sampling pipeline, the fifth sampling pipeline and the sixth sampling pipeline of the tracer gas automatic sampling device are connected to the upstream sampling point; the first sampling pipeline, the second sampling pipeline and the third sampling pipeline of the tracer gas automatic sampling device are connected to the downstream sampling point; the tail end of the first pipeline (10) of the tracer gas injection device is connected to the injection point; Step S2, pipeline purging, opening the first valve (4), the second valve (5), the third valve (6), the fourth valve (7) and the fifth valve (8), opening the first air purge (2) and the second air purge (3), and purging the first pipeline (10), the purging time is 5-10 minutes, and the purging flow rate is 50-100 ml / min; Step S3, closing the first valve (4), the second valve (5), the third valve (6) and the fifth valve (8), and keeping the fourth valve (7) open; Step S4, setting the required tracer gas injection flow rate on the gas flow meter (9); Step S5, opening the gas cylinder (1) and injecting the sulfur hexafluoride gas into the first pipeline (10); Step S6, adjusting the first valve (4) to a desired opening; Step S7, after the tracer gas flow rate on the gas flow meter (9) is stable, start the tracer gas automatic sampling device, the tracer gas injection flow rate is recorded as q, unit: ml / h; the fourth sampling pipeline, the fifth sampling pipeline and the sixth sampling pipeline are controlled by the automatic control program to start at a first start time, the first start time is recorded as T0, and the sampling time is 5s; the first sampling pipeline, the second sampling pipeline and the third sampling pipeline are controlled by the automatic control program to start at a second start time, the second start time is recorded as T1, and the sampling time is 5s, and the second start time is 1s after the first start time; Step S8: The three sampling concentrations of the fourth sampling line, the fifth sampling line and the sixth sampling line of the upstream sampling point are C 11 , C 12 and C 13 , the average value is C1, unit: ppm; the three sampling concentrations of the first sampling line, the second sampling line and the third sampling line of the downstream sampling point are C 21 , C 22 and C 23 , the average value is C2, unit: ppm; when the C 11 , said C 12 and the C 13 The deviation of any one of them from C1 does not exceed 10%, and the C 21 , said C 22 and the C 23 If the deviation of any one of them from C2 does not exceed 10%, the air volume Q used for measuring the free volume of the habitable area (97) of the main control room is Q=q / (C2-C1), unit: m 3 / h; Step S9, if the C 11 , said C 12 and the C 13 Any deviation from C1 exceeds 10% or the C 21 , said C 22 and the C 23 If any of the above deviates from C2 by more than 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest; Step S10, injection ends; Step S11, closing the gas cylinder (1); Step S12, closing the fourth valve (7); Step S13, opening the fifth valve (8); Step S14, using the second air purge device (3) to purge the first pipeline (10) for 3-5 minutes, with a purge flow rate of 50-100 ml / min; Step S15, closing the fifth valve (8); Step S16, opening the third valve (6); Step S17, using the first air purge device (2) to purge the first pipeline (10) for 3-5 minutes, with a purge flow rate of 50-100 ml / min; Step S18, closing the third valve (6); Step S19, closing the first valve (4).

8. The method according to claim 7, characterized in that: exist In the step S1, The injection point is selected upstream of the elbow or reducer of the upstream air duct; The position of the upstream sampling point or the position of the downstream sampling point is selected on the long straight pipe section of the upstream air duct or the downstream air duct; The distance between the position of the upstream sampling point or the position of the downstream sampling point and the position of the injection point is ≥5D; when the long straight pipe section is a circular pipe, D refers to the diameter of the long straight pipe section; when the long straight pipe section is a square pipe, D refers to the equivalent diameter of the long straight pipe section; When the location of the upstream sampling point or the location of the downstream sampling point is a square tube, the ports of the three sampling lines are arranged equidistantly along a horizontal straight line at the center point of the cross section of the square tube; When the location of the upstream sampling point or the location of the downstream sampling point is a circular tube, the ports of the three sampling lines are arranged at equal distances around the center point of the cross section of the circular tube.

9. A method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant using the free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as claimed in claim 6, comprising the following steps: Step S1, an injection point is set in the upstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room, and the tail end of the first pipeline (10) of the tracer gas injection device is connected to the injection point; 40 sampling points are set in each room of the habitable area (97) of the main control room, and the 40 sampling pipelines of the tracer gas automatic sampling device are connected to the 40 sampling points in a one-to-one correspondence; Step S2, pipeline purging, opening the first valve (4), the second valve (5), the third valve (6), the fourth valve (7) and the fifth valve (8), opening the first air purge (2) and the second air purge (3), and purging the first pipeline (10), the purging time is 5-10 minutes, and the purging flow rate is 50-100 ml / min; Step S3, closing the first valve (4), the second valve (5), the third valve (6) and the fifth valve (8), and keeping the fourth valve (7) open; Step S4, setting the required tracer gas injection amount on the gas flow meter (9); Step S5, adjusting the ventilation system of the habitable area of ​​the main control room to a normal operating condition; Step S6, opening the gas cylinder (1) and injecting the sulfur hexafluoride gas into the first pipeline (10); Step S7, adjusting the first valve (4) to a desired opening; Step S8, using a circulating air volume measurement method as described in claim 7 to test the air volume of the habitable area (97) of the main control room, denoted as Q s , unit: m 3 / h Step S9, injection ends; Step S10, the tracer gas injection amount is read by the gas flow meter (9), recorded as Q2, unit: ml; Step S11, closing the gas cylinder (1); Step S12, closing the fourth valve (7); Step S13, opening the fifth valve (8); Step S14, using the second air purge device (3) to purge the first pipeline (10) for 3-5 minutes, with a purge flow rate of 50-100 ml / min; Step S15, closing the fifth valve (8); Step S16, opening the third valve (6); Step S17, using the first air purge device (2) to purge the first pipeline (10) for 3-5 minutes, with a purge flow rate of 50-100 ml / min; Step S18, closing the third valve (6); Step S19, closing the first valve (4); Step S20, the design volume of the habitable area (97) of the main control room is V d , unit: m 3 , after the set time, the tracer gas automatic sampling device is started to sample; the set time is V d / Q s , unit: h; Step S21, the tracer gas concentration corresponding to the 40 sampling points is recorded as C vi , 1≤i≤40, unit: ppm, the average concentration of the 40 sampling points is C v , unit: ppm, each of the C vi With the C v The deviation of does not exceed 10%, then the free volume V of the habitable area (97) of the main control room is Q s / C v , unit: m 3 ; Step S22, if one of the C vi With the C v If the deviation exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest.

10. A method for evaluating measurement results of the method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant as claimed in claim 9, comprising the following steps: Step S1, determining the resolution δ1 of the gas flow meter (9); unit: ml / h; Step S2, determine the tracer gas injection flow rate q1; unit: ml / h; Step S3, calculating the uncertainty u(q1)=0.29δ1 of the tracer gas injection flow rate q1; unit: ml / min; Step S4, determining the resolution δ2 of the tracer gas injection time t1; u(t1)=0.29δ2=0; Unit: s; Step S5, determining the tracer gas injection time t; Unit: s; Step S6, calculating the uncertainty of the tracer gas injection time u(t)=0; Unit: s; Step S7, calculate the tracer gas injection amount Q = q*t / 3600; unit: ml; Step S8, calculating the uncertainty of the tracer gas injection amount Q, u(Q)=tu(q) / 3600; unit: ml; Step S9, calculating the equilibrium concentration of the tracer gas Unit: ppm; C vp,ij Refers to the tracer gas concentration at the jth sampling point in the i-th measurement; unit: ppm; Step S10, determining the resolution δ3 of the tracer gas analyzer used for tracer gas analysis; unit: ppm; Step S11, calculating the uncertainty u(C vp ,i)=0.046*δ3;Unit: ppm; Step S12, calculating the uncertainty of the free volume of the habitable area (97) of the main control room Unit: m 3 ; Step S13, calculating the uncertainty of n measurements of the free volume of the habitable area (97) of the main control room Step S14, determine the t corresponding to the t distribution when the degree of freedom is (n-1) 95％ value; Step S15, calculating the combined uncertainty of n measurements of the free volume of the habitable area (97) of the main control room: U(Ve)=t95%*u(Ve); unit: m 3 ; Step S16, draw the conclusion: the self-use volume test result Ve of the habitable area (97) of the main control room, the confidence interval [-U(Ve), U(Ve)], the confidence probability 95%; unit: m 3 .

11. A method for measuring the fresh air volume in the habitable area of ​​a nuclear power plant main control room using the free volume and internal leakage measurement system of the habitable area of ​​a nuclear power plant main control room as claimed in claim 6, comprising the following steps: Step S1, an injection point is set on the upstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room, and the tail end of the first pipeline (10) of the tracer gas injection device is connected to the injection point; a sampling point is set on the downstream air duct of the fan of the ventilation system of the habitable area of ​​the main control room; the first sampling pipeline, the second sampling pipeline and the third sampling pipeline of the tracer gas automatic sampling device are connected to the sampling point; Step S2, pipeline purging, opening the first valve (4), the second valve (5), the third valve (6), the fourth valve (7) and the fifth valve (8), opening the first air purge (2) and the second air purge (3), and purging the first pipeline (10), the purging time is 5-10 minutes, and the purging flow rate is 50-100 ml / min; Step S3, closing the first valve (4), the second valve (5), the third valve (6) and the fifth valve (8), and keeping the fourth valve (7) open; Step S4, setting the required tracer gas injection flow rate on the gas flow meter (9); Step S5, opening the gas cylinder (1) and injecting the sulfur hexafluoride gas into the first pipeline (10); Step S6, adjusting the first valve (4) to a desired opening; Step S7, after the tracer gas flow rate on the gas flow meter (9) is stable, start the tracer gas automatic sampling device, the tracer gas injection flow rate is recorded as q2, unit: ml / h; the first sampling pipeline, the second sampling pipeline and the third sampling pipeline are controlled by the automatic control program to start at the same start time, the start time is recorded as T3, and the sampling time is 5s; Step S8: The three sampling concentrations of the first sampling line, the second sampling line and the third sampling line at the sampling point are C n1 , C n2 and C n3 , whose average value is C n , unit: ppm; when the C n1 , said C n2 and the C n3 Any one of the C n The deviation of is no more than 10%, then the fresh air volume Q used for measuring the internal leakage of the habitable area (97) of the main control room is n =q2 / C n , unit: m 3 / h; Step S9, if the C n1 , said C n2 and the C n3 Any one of the C n If the deviation exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest; Step S10, injection ends; Step S11, closing the gas cylinder (1); Step S12, closing the fourth valve (7); Step S13, opening the fifth valve (8); Step S14, using the second air purge device (3) to purge the first pipeline (10) for 3-5 minutes, with a purge flow rate of 50-100 ml / min; Step S15, closing the fifth valve (8); Step S16, opening the third valve (6); Step S17, using the first air purge device (2) to purge the first pipeline (10) for 3-5 minutes, with a purge flow rate of 50-100 ml / min; Step S18, closing the third valve (6); Step S19, closing the first valve (4).

12. The method according to claim 11, characterized in that: In step S1, The injection point is selected upstream of the elbow or reducer of the upstream air duct; The sampling point is located on the long straight section of the downstream air duct; The interval between the sampling point and the injection point is ≥5D; when the long straight pipe section is a circular pipe, D refers to the diameter of the long straight pipe section; when the long straight pipe section is a square pipe, D refers to the equivalent diameter of the long straight pipe section; When the sampling point is located at a square tube, the ports of the three sampling lines are arranged equidistantly along a horizontal straight line at the center point of the cross section of the square tube; When the sampling point is located at a circular tube, the ports of the three sampling lines are arranged at equal distances around the center point of the cross section of the circular tube.

13. A method for measuring the internal leakage of the habitable area of ​​the main control room of a nuclear power plant using the free volume and internal leakage measurement system of the habitable area of ​​the main control room of a nuclear power plant as claimed in claim 6, using a concentration decay method, comprising the following steps: Step S1, a tracer gas injection point (136) is respectively provided on the twelfth ventilation pipeline (114) and the thirteenth ventilation pipeline (115) upstream of the fan of the ventilation system of the habitable area of ​​the main control room, and the tail end of the first pipeline (10) of the tracer gas injection device is divided into two paths connected to the two tracer gas injection points (136); 40 sampling points are provided in each room of the habitable area (97) of the main control room, and the 40 sampling pipelines of the tracer gas automatic sampling device are connected to the 40 sampling points in a one-to-one correspondence; Step S2, pipeline purging, opening the first valve (4), the second valve (5), the third valve (6), the fourth valve (7) and the fifth valve (8), opening the first air purge (2) and the second air purge (3), and purging the first pipeline (10), the purging time is 5-10 minutes, and the purging flow rate is 50-100 ml / min; Step S3, closing the first valve (4), the second valve (5), the third valve (6) and the fifth valve (8), and keeping the fourth valve (7) open; Step S4, setting the required tracer gas injection amount on the gas flow meter (9); Step S5, adjusting the ventilation system of the habitable area of ​​the main control room to the special operating condition; Step S6, opening the gas cylinder (1) and injecting the sulfur hexafluoride gas into the first pipeline (10); Step S7, adjusting the first valve (4) to a desired opening; Step S8, using a circulating air volume measurement method as described in claim 7, to test the circulating air volume of the habitable area of ​​the main control room, denoted as Q C , unit: m 3 / h; Step S9, injection ends; Step S10, the tracer gas injection amount is read by the gas flow meter (9), recorded as Q3, unit: ml; Step S11, closing the gas cylinder (1); Step S12, closing the fourth valve (7); Step S13, opening the fifth valve (8); Step S14, using the second air purge device (3) to purge the first pipeline (10) for 3-5 minutes, with a purge flow rate of 50-100 ml / min; Step S15, closing the fifth valve (8); Step S16, opening the third valve (6); Step S17, using the first air purge device (2) to purge the first pipeline (10) for 3-5 minutes, with a purge flow rate of 50-100 ml / min; Step S18, closing the third valve (6); Step S19, closing the first valve (4); Step S20, testing the background concentration of the habitable area of ​​the main control room, recorded as C0, unit: ppm; Step S21, using the free volume V obtained by the measurement method for measuring the free volume of the habitable area of ​​the main control room of a nuclear power plant according to claim 9, unit: m 3 After the first sampling time, the ventilation system of the habitable area of ​​the main control room is switched from the special operating condition to the emergency operating condition, and the automatic tracer gas sampling device is started to perform the first sampling of the 40 sampling points; the first sampling time is V / Q C , unit: h; Step S22: In the first sampling, the first tracer gas concentration corresponding to the 40 sampling points is recorded as C 3i , 1≤i≤40, unit: ppm, the average concentration of the first tracer gas at the 40 sampling points is C3, unit: ppm, each C 3i The deviation from the stated C3 does not exceed 10%; Step S23, a separate air volume measurement sampling point (137) is respectively set on the twelfth ventilation pipeline (114) and the thirteenth ventilation pipeline (115) upstream of the fan of the ventilation system in the habitable area of ​​the main control room, and the first sampling is performed at the two separate air volume measurement sampling points (137). The average value of the tracer gas concentration at the two separate air volume measurement sampling points (137) is recorded as C b1 , unit: ppm, the C b1 The deviation from the stated C3 does not exceed 10%; Step S24, testing the fresh air volume of the habitable area (97) of the main control room, denoted as Q n2 , unit: m 3 / h; Step S25, setting the second sampling time for the 40 sampling points to T4 ≥ V / Q n2 , unit: h; Step S26, in the second sampling, the second tracer gas concentration corresponding to the 40 sampling points is recorded as C 4i , 1≤i≤40, unit: ppm, the average concentration of the second tracer gas at the 40 sampling points is C4, unit: ppm, each C 4i The deviation from the stated C4 does not exceed 10%; Step S27, a second sampling is performed at the two separate air volume measurement sampling points (137), and the average value of the tracer gas concentration at the two separate air volume measurement sampling points (137) is recorded as C b2 , unit: ppm, the C b2 The deviation from the stated C4 does not exceed 10%; Step S28, if the C 3i Deviation from C3, C b1 Deviation from C3, C 4i Deviation from the C4 or the C b2 If the deviation from C4 exceeds 10%, it is necessary to find the cause. After solving the problem, return to step S2 and retest; Step S29, calculating the ventilation rate of the habitable area (97) of the main control room: A=(lnC3-lnC4) / T4; Step S30, calculating the internal leakage of the habitable area (97) of the main control room: Q leak =A*VQ n2 , unit: m 3 / h; Step S31, repeat the test n times, n≥1, calculate the internal leakage of the habitable area (97) of the main control room respectively, and use the average value as the final test result.

14. A method for evaluating measurement results of a method for measuring leakage in a habitable area of ​​a main control room of a nuclear power plant as claimed in claim 13, comprising the following steps: Step S1, determining the resolution δ1 of the gas flow meter (9); unit: ml / h; Step S2, determining the tracer gas injection flow rate q2; unit: ml / h; Step S3, calculating the uncertainty of the tracer gas injection flow rate q2 u(q2) = 0.29δ1; unit: ml / min; Step S4, determining the resolution δ3 of the tracer gas analyzer; unit: ppm; Step S5, using the steps in the fresh air volume measurement method for measuring leakage in the habitable area of ​​the main control room of a nuclear power plant as described in claim 11, calculate the tracer gas concentration C at the air volume measurement point n =(C n1 +C n2 +C n3 ) / 3; unit: ppm; Step S6, calculating the uncertainty of the tracer gas concentration u(C n )=0.167δ2; Unit :ppm; Step S7, calculate the fresh air volume Qn = q2 / C n ; Unit: m 3 / h; Step S8, calculate the uncertainty of the fresh air volume, Unit: m 3 / h; Step S9, determining the tracer gas sampling interval T in the habitable area of ​​the main control room; unit: h; Step S10, calculating the uncertainty u(T) of the sampling interval time T of the tracer gas in the habitable area of ​​the main control room = 0; unit: h; Step S11, the first tracer gas concentration corresponding to the 40 sampling points in the first sampling is recorded as C 3i The second tracer gas concentration corresponding to the 40 sampling points in the second sampling is recorded as C 4i , 1≤i≤40; unit: ppm; Step S12, calculating the uncertainty u(C 3i )=u(C 4i )=0.29δ3; Unit :ppm; Step S13, calculating the uncertainty u(C i,3 )=u(C i,4 )=0.046*δ3; unit: ppm; C i,3 It refers to the average concentration of tracer gas in the first sampling of the ith test, unit: ppm; C i,4 It refers to the average concentration of tracer gas in the second sampling of the ith test, unit: ppm; Step S14, calculating the average ventilation rate A of the habitable area (97) of the main control room i =(lnC i,3 -lnC i,4 ) / T; Unit: times / h; Step S15, calculating the uncertainty of the average ventilation rate of the habitable area (97) of the main control room Unit: times / h; Step S16, calculating the internal leakage Q of the habitable area (97) of the main control room i,leak =A i *VQ n2 ; Unit: m 3 / h; Step S17, calculating the uncertainty of the internal leakage of the habitable area (97) of the main control room Unit: m 3 / h; Step S18, calculating the uncertainty of n measurements of the internal leakage of the habitable area (97) of the main control room Unit: m 3 / h; Step S19, determine the t corresponding to the t distribution when the degree of freedom is (n-1) 95％ value; Step S20, calculating the comprehensive uncertainty of n measurements of the internal leakage of the habitable area (97) of the main control room: U(Q e,leak ) = t 95％ *u(Q e,leak ); Unit: m 3 / h; Step S21, draw the conclusion: the internal leakage test result Q of the habitable area (97) of the main control room is e,leak , confidence interval [-U(Q e,leak ),U(Q e,leak )], confidence probability 95%; unit: m 3 / h.

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