Performance verification test system and test method for passive safety injection system

Abstract

The invention provides a performance verification test system and test method of a passive safety injection system, the test system comprises a gas supplementing flow channel and a water supplementing flow channel, one end of the gas supplementing flow channel extends to a gas space of a safety injection box; one end of the water supplementing runner extends to the liquid space of the safety injection tank; a safety injection pipeline and a drainage pipeline are arranged on the safety injection tank, one end of the safety injection pipeline extends to the reactor pressure vessel, one end of the drainage pipeline extends to the water storage tank, a liquid level meter is arranged in the safety injection tank, and a temporary test flowmeter is arranged on the drainage pipeline; the device further comprises a control system, and the control system is used for collecting time-varying data of the liquid level meter and the flow meter during the MAP test to obtain a first target relational expression of the outflow volume of the safety injection tank and the liquid level; the control system is used for collecting data of the liquid level meter during a safety injection test and obtaining a second target relational expression that the liquid level of the safety injection tank changes along with time; and calculating the flow values at different moments in the safety injection test process by using the first target relational expression and the second target relational expression.

Description

Technical Field

[0001] This invention relates to the field of passive safety injection system performance verification technology, specifically to a performance verification test system and test method for passive safety injection systems. Background Technology

[0002] The passive safety injection system is an important component of the passive dedicated safety system of advanced pressurized water reactors. In the event of an accident, it uses a passive design concept to safely inject and remove heat from the reactor core, ensuring the integrity of the reactor and ultimately preventing the release of radioactive materials into the environment.

[0003] Therefore, in order to practically eliminate the possibility of a large release of radioactive materials from the design, the function of the passive safety injection system must be guaranteed in the event of an accident.

[0004] During the commissioning and periodic testing phases after the completion of nuclear power plant construction, the passive safety injection system will be systematically commissioned to verify that its performance meets design requirements. This mainly includes verification of flow resistance, injection flow rate, and the relationship between liquid level and volume in the safety injection tank.

[0005] All of the above experiments require flow data from the experiment to support the analysis. However, after the construction is completed, the formal steel structure pipeline has been installed. At this time, it is no longer possible to install a high-precision flow measurement device in the system flow channel. At the same time, due to the rapid instantaneous change in system flow during the injection process of the passive injection system, the accuracy and instantaneous response of the measurement device are extremely important. Using a traditional ultrasonic flow measurement device would be difficult to meet the measurement accuracy requirements.

[0006] Based on this, the inventors of this application propose a performance verification test system and test method for a passive safety injection system, in order to solve one or more of the above-mentioned technical problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defect of low flow measurement accuracy in the passive safety injection system in the prior art, and to provide a performance verification test system and test method for a passive safety injection system.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution:

[0009] This invention provides a performance verification test system for a passive safety injection system, comprising:

[0010] The make-up flow channel extends at one end into the gas space of the injection box;

[0011] The water supply channel extends at one end into the liquid space of the injection tank;

[0012] The safety injection tank is equipped with a safety injection line and a condensate drain line. One end of the safety injection line extends to the reactor pressure vessel, and the other end of the condensate drain line extends to a water storage tank. A level gauge is installed inside the safety injection tank, and a temporary test flow meter is installed on the condensate drain line.

[0013] It also includes a control system, which is used during the MAP test to collect data on the changes of the level gauge and the flow meter over time to obtain a first target relationship between the outflow volume of the injection tank and the liquid level;

[0014] The control system is used to collect data from the level gauge and obtain a second objective relationship between the liquid level in the injection tank and time during the injection test.

[0015] The flow rate values ​​at different times during the safety injection test are calculated using the first objective relation and the second objective relation.

[0016] According to one embodiment of the present invention, the first target relation is: dV / dL;

[0017] In the MAP test, the level gauge measures the change in liquid level in the injection tank over time, L(t); the flow meter measures the change in cumulative outflow volume in the injection tank over time, V(t).

[0018] Based on the time-varying data L(t) of the liquid level in the injection tank and the time-varying data V(t) of the cumulative outflow volume in the injection tank, the relationship between the outflow volume and the liquid level in the injection tank is obtained by fitting the data. The derivative of V(L) is then used to obtain dV / dL.

[0019] According to one embodiment of the present invention, the relationship between the liquid level in the injection tank and time is dL / dt;

[0020] The liquid level gauge measures the change in liquid level in the injection tank over time, L(t), during the injection test, and calculates its derivative to obtain dL / dt.

[0021] The product of the first objective relation and the second objective relation yields the change data Q of the injection flow rate over time during the injection test, where,

[0022] Q = dV / dt.

[0023] According to one embodiment of the present invention, the injection tank is further provided with a pressure measuring mechanism, which is used to measure the pressure value inside the injection tank;

[0024] The resistance of the passive safety injection system is calculated using the pressure value, the bottom elevation of the safety injection tank, and the elevation of the pressure vessel flange face; wherein...

[0025] The formula for calculating the resistance is: R = ΔH / Q 2 ;

[0026] Where △H is the sum of the bottom elevation of the injection tank, the liquid level in the injection tank, and the pressure value in the injection tank, minus the elevation of the pressure vessel flange face, and Q is the change data of the injection flow rate over time during the injection test.

[0027] According to one embodiment of the present invention, the shape of the injection box includes a spherical shape and a cylindrical shape; wherein,

[0028] The formula for calculating V(L) of the spherical injection tank is:

[0029] V(L)=A1L 6 +B1L 5 +C1L 4 +D1L 3 +E1L 2 +F1L+G1;

[0030] The formula for calculating V(L) of the cylindrical injection tank is:

[0031] V(L)=A1L+B1.

[0032] According to one embodiment of the present invention, an air compressor and an air supply control valve are sequentially provided on the air supply channel;

[0033] The water replenishment channel is sequentially equipped with a demineralized water tank, an inlet control valve, a water replenishment pump, and another water replenishment control valve.

[0034] The control system is communicatively connected to the air compressor, the air replenishment control valve, the water inlet control valve, the water replenishment pump, and the water replenishment control valve, respectively.

[0035] It also includes a data acquisition system, which is communicatively connected to the pressure measuring mechanism, the level gauge and the flow meter.

[0036] According to one embodiment of the present invention, a drain valve is provided on the drain line and an injection control valve is provided on the injection line.

[0037] The present invention also provides a performance verification test method for a passive injection system, employing the performance verification test system for a passive injection system as described above, the test method comprising:

[0038] Step 1: In the MAP test, the liquid level in the injection tank changes over time (L(t)) and the cumulative outflow volume in the injection tank changes over time (V(t)) using a level gauge and a flow meter, respectively.

[0039] Step 2: Based on the data of the liquid level in the injection tank changing over time L(t) and the data of the cumulative outflow volume in the injection tank changing over time V(t), fit the relationship between the outflow volume in the injection tank and the liquid level in the injection tank V(L), and take the derivative of V(L) to obtain dV / dL;

[0040] Step 3: Use a level gauge to measure the change in liquid level in the injection tank over time, L(t), and calculate its derivative to obtain dL / dt;

[0041] Step 4: Multiply the dV / dL and the dL / dt to obtain the change data Q of the injection flow rate over time during the injection test; where Q = dV / dt.

[0042] According to an embodiment of the present invention, the steps preceding step 1 include:

[0043] Step 11: Before the MAP test, connect the drain line after the drain valve of the injection tank, install a temporary test flow meter on the drain line, and then place the outlet end of the drain line in the water storage tank.

[0044] Step 12: Complete the measurement of safety injection parameters; including measuring the bottom elevation of the safety injection tank and the elevation of the reactor pressure vessel flange face;

[0045] Step 13: Using the control system, open the inlet control valve, the water supply pump, and the water supply control valve to transport the demineralized water in the demineralized water tank to the injection tank through the water supply channel. When the liquid level in the injection tank reaches the test requirements, close the inlet control valve, the water supply pump, and the water supply control valve.

[0046] According to an embodiment of the present invention, step 1 includes:

[0047] After the control system is turned on, the drain valve and the air supply control valve are opened, and the demineralized water in the injection tank is discharged to the water storage tank under the action of gravity. The liquid level in the injection tank changes with time L(t) and the drain flow rate changes with time q(t). The cumulative outflow volume in the injection tank changes with time V(t) by accumulating the q(t).

[0048] According to an embodiment of the present invention, step 3 includes:

[0049] Step 31: Close the drain valve, and replenish the demineralized water into the injection tank again through the water replenishment pump. After the liquid level in the injection tank reaches the required value for the test, close the water replenishment pump, the water inlet control valve and the water replenishment control valve.

[0050] Step 32: Turn on the air compressor and the air replenishment control valve through the control system, and inject gas into the safety injection box through the air replenishment channel to pressurize the safety injection box. When the pressure of the safety injection box reaches the test value, turn off the air compressor and the air replenishment control valve.

[0051] Step 33: After activating the data acquisition system, open the injection control valve. Water in the injection tank is injected into the reactor pressure vessel under the influence of gas pressure and gravity, and overflows through the flange into the reactor sump. Record the pressure change data P(t) in the injection tank over time and the liquid level change data L(t) in the injection tank over time; where L(t) = A³t 3 +B3t 2 +C3t+D4;

[0052] Step 34: Take the derivative of L(t) to obtain dL / dt.

[0053] According to one embodiment of the present invention, the method further includes step 5, calculating the driving force ΔH in the injection channel test based on the measured installation bottom elevation H1 of the injection tank, the liquid level change data L(t) in the injection tank over time, the flange elevation H2 of the reactor pressure vessel, and the pressure change data P(t) in the injection tank over time; wherein, ΔH=(H1+L(t)+P(t) / ρg-H2);

[0054] Based on the driving force ΔH and the value of Q, the resistance R of the injection channel is calculated; where R = ΔH / Q 2 .

[0055] The positive and progressive effects of this invention are as follows:

[0056] The performance verification test system of the passive safety injection system of this invention uses the first objective relationship calculated during the MAP test and the second objective relationship calculated during the safety injection test to calculate the flow rate value at different times during the safety injection test. This overcomes the difficulty of direct flow measurement caused by the inability to install traditional flow meters on the formal safety injection flow channel, and avoids the risk of pipeline damage caused by the installation of flow meters on the formal safety injection flow channel, thereby ensuring the flow measurement accuracy of the safety injection test. Attached Figure Description

[0057] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0058] Figure 1 This is a schematic diagram of the performance verification test system for the passive injection system of the present invention.

[0059] 1. Air supply channel; 11. Air compressor; 12. Air supply control valve;

[0060] 2. Injection tank; 21. Injection pipeline; 22. Drainage pipeline; 23. Level gauge; 24. Flow meter; 25. Pressure measuring mechanism; 26. Drainage valve; 27. Injection control valve; 28. Temperature measuring mechanism;

[0061] 3. Water supply channel; 31. Demineralized water tank; 32. Inlet water control valve; 33. Water supply pump; 34. Water supply control valve;

[0062] 4. Reactor pressure vessel;

[0063] 5. Water storage tank;

[0064] 6. Control system;

[0065] 7. Data acquisition system. Detailed Implementation

[0066] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0068] Please refer to Figure 1 This invention proposes a performance verification test system for a passive safety injection system, including a make-up gas channel 1 and a make-up water channel 3. One end of the make-up gas channel 1 extends to the gas space of the safety injection tank 2; one end of the make-up water channel 3 extends to the liquid space of the safety injection tank 2; the safety injection tank 2 is equipped with a safety injection pipeline 21 and a drain pipeline 22. One end of the safety injection pipeline 21 extends to the reactor pressure vessel 4, and one end of the drain pipeline 22 extends to the water storage tank 5. A level gauge 23 is installed inside the safety injection tank 2, and a temporary test flow meter 24 is installed on the drain pipeline 22.

[0069] Specifically, the interface between the gas supply channel 1 and the injection tank 2 is located near the upper region of the injection tank 2, thereby connecting the gas supply channel 1 and the gas space of the injection tank 2. Meanwhile, the interface between the water supply channel 3 and the injection tank 2 is located near the lower region of the injection tank 2, thereby connecting the water supply channel 3 and the liquid space of the injection tank 2.

[0070] The verification system also includes a control system 6. During the MAP test, the control system 6 is used to collect data on the changes in liquid level gauge 23 and flow meter 24 over time to obtain the first target relationship between the outflow volume and liquid level of the injection tank 2. During the injection test, the control system 6 is used to collect data on liquid level gauge 23 and obtain the second target relationship between the liquid level of the injection tank 2 and time. The flow rate values ​​at different times during the injection test are calculated using the first and second target relationships.

[0071] It is known that after the nuclear power plant construction is completed and it enters the commissioning and testing phase as well as the periodic testing phase, the passive safety injection system will be systematically commissioned to verify that the performance of the passive safety injection system meets the design requirements. However, after the construction is completed, the safety injection pipeline 21 has been installed. At this time, in order to avoid increasing the risk of damage to the safety injection pipeline 21, it is no longer possible to install high-precision measuring devices on the safety injection pipeline 21.

[0072] Based on this, this application uses the control system 6 to collect data on the changes of liquid level gauge 23 and flow meter 24 over time during the MAP test to obtain the first target relationship between the outflow volume of the injection tank 2 and the liquid level. Then, during the injection test, the control system 6 is used to collect data from the liquid level gauge 23 to obtain the second target relationship between the liquid level of the injection tank 2 and the time. The flow rate values ​​at different times during the injection test are calculated using the first target relationship and the second target relationship.

[0073] It can be seen that the MAP (Maximum Accumulator Pressure Test) test corresponds to the maximum accumulator pressure test.

[0074] Therefore, this application can accurately measure the test flow rate without installing a flow measurement device on the injection pipeline 21, thereby overcoming the problem of difficulty in direct flow measurement caused by the inability to install the flow meter 24, and ensuring the accuracy of flow measurement in the injection test.

[0075] Specifically, the first objective relation is: dV / dL;

[0076] In the MAP test, the level gauge 23 measured the change in liquid level L(t) in the injection tank 2 over time; the flow meter 24 measured the change in cumulative outflow volume V(t) in the injection tank 2 over time.

[0077] Based on the data L(t) of the liquid level change in the injection tank 2 over time and the data V(t) of the cumulative outflow volume in the injection tank 2 over time, the relationship between the outflow volume and the liquid level in the injection tank 2 is obtained by fitting the data. The derivative of V(L) is then used to obtain dV / dL.

[0078] The relationship between the liquid level in the injection tank 2 and time is expressed as dL / dt;

[0079] Among them, the liquid level gauge 23 measures the liquid level change data L(t) in the injection tank 2 over time during the injection test, and the derivative is obtained to get dL / dt;

[0080] The product of the first objective relation and the second objective relation yields the change in injection flow rate over time, Q, during the injection test.

[0081] Q = dV / dt.

[0082] Furthermore, the injection tank 2 is also equipped with a pressure measuring mechanism 25, which is used to measure the pressure value inside the injection tank 2; the resistance of the passive injection system is calculated using the pressure value, the bottom elevation of the injection tank 2, and the elevation of the pressure vessel flange face; among which,

[0083] The formula for calculating resistance is: R = ΔH / Q 2 ;

[0084] Wherein, △H is the sum of the bottom elevation of the injection tank 2, the liquid level in the injection tank 2, and the pressure value in the injection tank 2, minus the elevation of the pressure vessel flange face, and Q is the change data of the injection flow rate over time during the injection test.

[0085] That is, this application conducts a MAP test before the formal injection test. A flow meter 24 is installed on the drainage pipe 22 installed on the drainage port of the injection tank 2. During the MAP test, the liquid level change data L(t) during the MAP test is measured by the liquid level gauge 23 in the injection tank 2. The cumulative outflow volume change data V(t) during the MAP test is obtained by the flow meter 24 installed on the drainage pipe 22. Based on the liquid level change data L(t) and the cumulative volume change data obtained above, the relationship between the cumulative volume and the liquid level V(L) is calculated.

[0086] Optionally, the shape of the injection tank 2 includes a spherical shape and a cylindrical shape; wherein,

[0087] The formula for calculating V(L) of the spherical injection tank 2 is:

[0088] V(L)=A1L 6 +B1L 5 +C1L 4 +D1L 3 +E1L 2 +F1L+G1;

[0089] The formula for calculating V(L) of cylindrical injection tank 2 is:

[0090] V(L)=A1L+B1.

[0091] Then, by taking the derivative of V(L), we obtain the dV / dL relation, which also corresponds to the first objective relation.

[0092] After completing the MAP test, the injection test was carried out through the formal injection channel. During the test, the liquid level change data over time was measured by the liquid level gauge 23 installed in the injection tank 2, and the relationship L(t) was obtained by fitting. The derivative of L(t) was obtained to get dL / dt, which also corresponds to the second target relationship.

[0093] Multiplying the first objective relational expression and the second objective relational expression yields the data Q, which shows the change in injection flow rate over time during the injection test.

[0094] Specifically, Q = (dV / dL) × (dL / dt) = dV / dt.

[0095] Furthermore, based on the pre-test measurements of the installation bottom elevation (H1) of the injection tank 2, the time-varying liquid level L(t) in the injection tank 2, the pressure vessel flange elevation (H2), and the pressure P in the injection tank 2, the driving force ΔH for the injection test is calculated, thus completing the resistance calculation of the passive injection system: R = ΔH / Q. 2 .

[0096] Therefore, by combining the MAP test and the formal injection test, this invention obtains the relationship between the outflow volume of the injection tank 2 and the liquid level of the injection tank 2 (dV / dL), and the relationship between the liquid level of the injection tank 2 and the time (dL / dt) during the injection test. This allows for the calculation of the flow rate values ​​at different times during the injection test, overcoming the problem of flow meter 24 being unable to be installed during the formal injection test, which leads to difficulties in flow measurement. It also avoids the risk of damage to the injection pipeline 21 caused by installing the flow meter 24 on the formal injection channel, ensuring the accuracy of flow measurement during the injection test.

[0097] Moreover, the execution of the MAP test in the safety injection system can effectively verify whether the relationship between the volume of the safety injection tank 2 and the liquid level meets the design requirements, ensure the rationality of the liquid level instrument setting value, and greatly improve the safety of the unit.

[0098] Moreover, it greatly improves the convenience of the experiment, effectively reduces the experiment cost, and shortens the experiment cycle.

[0099] Please continue to refer to Figure 1An air compressor 11 and an air supply control valve 12 are sequentially arranged on the air supply channel 1; a demineralized water tank 31, a water inlet control valve 32, a water supply pump 33, and a water supply control valve 34 are sequentially arranged on the water supply channel 3; a control system 6 is communicatively connected to the air compressor 11, the air supply control valve 12, the water inlet control valve 32, the water supply pump 33, and the water supply control valve 34, and the control system 6 is used to control the opening and closing of the air compressor 11, the air supply control valve 12, the water inlet control valve 32, the water supply pump 33, and the water supply control valve 34, respectively; it also includes a data acquisition system 7, which is communicatively connected to the pressure measuring mechanism 25, the level gauge 23, the flow meter 24, and the temperature measuring mechanism 28, respectively.

[0100] The injection box 2 is also equipped with a temperature measuring mechanism 28, and the data acquisition system 7 is connected to the temperature measuring mechanism 28.

[0101] Furthermore, a drain valve 26 is provided on the drain line 22, and an injection control valve 27 is provided on the injection line 21. The injection control valve 27 is used to control the on / off state of the injection line 21.

[0102] This invention also proposes a performance verification test method for a passive safety injection system, employing the above-mentioned performance verification test system for passive safety injection systems, and the test method includes:

[0103] Step 1: In the MAP test, the liquid level change data L(t) in the injection tank 2 and the cumulative outflow volume change data V(t) in the injection tank 2 over time are measured using the level gauge 23 and the flow meter 24, respectively.

[0104] Step 2: Based on the data of the liquid level change L(t) in the injection tank 2 and the data of the cumulative outflow volume V(t) in the injection tank 2 over time, fit the relationship between the outflow volume and the liquid level in the injection tank 2, and obtain the derivative of V(L) to get dV / dL;

[0105] Step 3: Use level gauge 23 to measure the change in liquid level L(t) in the injection tank 2 over time during the injection test, and take its derivative to obtain dL / dt;

[0106] Step 4: Multiply dV / dL and dL / dt to obtain the change data Q of the injection flow rate over time during the injection test; where Q = dV / dt.

[0107] Specifically, step 1 includes:

[0108] After the control system 6 is turned on, the drain valve 26 and the air supply control valve 12 are turned on. Under the action of gravity, the demineralized water in the injection tank 2 is discharged to the water storage tank 5, and the liquid level in the injection tank 2 changes with time L(t) and the drain flow rate changes with time q(t) are recorded. The cumulative outflow volume in the injection tank 2 changes with time V(t) by accumulating q(t).

[0109] For step 3, step 3 includes:

[0110] Step 31: Close the drain valve 26, and replenish the demineralized water into the injection tank 2 again through the water replenishment pump 33. After the liquid level in the injection tank 2 reaches the required value for the test, close the water replenishment pump 33, the water inlet control valve 32 and the water replenishment control valve 34.

[0111] Step 32: Turn on the air compressor 11 and the air replenishment control valve 12 through the control system 6, and inject gas into the safety injection box 2 through the air replenishment channel 1 to complete the pressurization of the safety injection box 2. When the pressure of the safety injection box 2 reaches the test value, turn off the air compressor 11 and the air replenishment control valve 12.

[0112] Step 33: After starting the data acquisition system 7, open the safety injection control valve 27. The water in the safety injection tank 2 is injected into the reactor pressure vessel 4 under the action of gas pressure and gravity, and overflows into the reactor pit through the flange face. Record the pressure change data P(t) in the safety injection tank 2 over time and the liquid level change data L(t) in the safety injection tank 2 over time.

[0113] In one implementation, L(t) = A3t 3 +B3t 2 +C3t+D4.

[0114] Step 34: Take the derivative of L(t) to obtain dL / dt.

[0115] Step 5 also includes step 5, which calculates the driving force ΔH in the injection channel test based on the measured installation bottom elevation H1 of injection tank 2, the liquid level change data L(t) in injection tank 2 over time, the flange elevation H2 of reactor pressure vessel 4, and the pressure change data P(t) in injection tank 2 over time; where ΔH=(H1+L(t)+P(t) / ρg-H2);

[0116] The resistance R of the injection channel is calculated based on the driving force ΔH and Q; where R = ΔH / Q 2 .

[0117] Please continue to refer to Figure 1 The performance verification test method of the passive injection system of the present invention is divided into two stages: the MAP test stage and the injection flow channel test.

[0118] Before the MAP test begins, connect the drain line 22 after the drain valve 26 of the injection tank 2, install the flow meter 24 on the drain line 22, and place the outlet of the drain line 22 into the water storage tank 5.

[0119] The measurement of safety injection parameters includes the bottom elevation H1 of safety injection tank 2 and the flange elevation H2 of reactor pressure vessel 4.

[0120] The inlet control valve 32, the water supply pump 33, and the water supply control valve 34 are opened by the control system 6. The demineralized water in the demineralized water tank 31 is transported to the injection tank 2 through the drainage pipeline 22. When the liquid level in the injection tank 2 reaches the test requirements, the inlet control valve 32, the water supply pump 33, and the water supply control valve 34 are closed.

[0121] After the data acquisition system 7 is turned on, the drain valve 26 and the air supply control valve 12 of the injection tank 2 are opened. Under the action of gravity, the demineralized water in the injection tank 2 is discharged to the water storage tank 5. During this process, the liquid level in the injection tank 2 changes with time L(t) and the drain flow rate changes with time q(t).

[0122] The discharge volume V(t) is obtained by accumulating the condensate flow rate over time data q(t). The relationship between the outflow volume and the liquid level in the ambulance 2 is obtained by fitting the liquid level L(t) in the ambulance 2 and the discharge volume V(t).

[0123] Optionally, for the spherical injection box 2, the following formula of degree six or higher is used: V(L)=A1L 6 +B1L 5 +C1L 4 +D1L 3 +E1L 2 +F1L+G1, for a cylindrical pressure vessel, the linear equation V(L)=A2L+B2 is derived using data from the straight section, and the derivative is used to obtain the dV / dL relationship.

[0124] Then close the drain valve 26 and replenish the demineralized water into the injection tank 2 again through the water replenishment pump 33. After the liquid level in the injection tank 2 reaches the test requirements, close the water replenishment pump 33, the inlet control valve 32, and the water replenishment control valve 34.

[0125] The air compressor 11 and the air replenishment control valve 12 are turned on by the control system 6. Gas is injected into the safety injection box 2 through the air replenishment pipeline 1 to complete the pressurization of the safety injection box 2. When the pressure in the safety injection box 2 reaches the test value, the air compressor 11 and the air replenishment control valve 12 are turned off.

[0126] After the data acquisition system 7 is turned on, the safety injection control valve 27 is opened. The water in the safety injection tank 2 is injected into the reactor pressure vessel 4 under the action of gas pressure and gravity, and overflows into the reactor pit through the flange face.

[0127] During the experiment, the pressure change data P(t) and the liquid level change data L(t) in the injection tank 2 over time were recorded.

[0128] Specifically, the formula for fitting the liquid level change over time in the injection tank 2 is: L(t)=A3t 3 +B3t 2 +C3t+D4, and take the derivative of this relationship to obtain the dL / dt relationship. Multiply the dL / dt obtained from the safety injection flow channel test with the dV / dL obtained from the MAP test to get dL / dt×dV / dL=dV / dt, which is the flow rate Q injected in the safety injection flow channel test.

[0129] Based on the measured bottom elevation H1 of the injection tank 2, the liquid level change data L(t) in the injection tank 2 over time, the flange elevation H2 of the reactor pressure vessel 4, and the pressure change data P(t) in the injection tank 2 over time, the driving force ΔH = (H1 + P(t) / ρg - H2) in the injection channel test can be calculated. Combined with the previously derived injection flow rate Q, the resistance R = ΔH / Q of the entire injection channel can be obtained. 2 .

[0130] In summary, this invention eliminates the need to install a flow measurement device on the formal injection channel during the passive injection system test. A MAP test is conducted before the formal injection test to obtain the relationship between the outflow volume and the liquid level in injection tank 2, expressed as dV / dL. Based on this, the injection test is performed, and the change in liquid level over time is measured using a level gauge installed in injection tank 2, yielding the relationship between the liquid level in injection tank 2 and time, expressed as dL / dt.

[0131] This allows us to calculate the flow rate Q = dV / dt at different times during the safety injection test, overcoming the difficulty of direct flow measurement caused by the inability to install the flow meter 24, avoiding the risk of damage to the safety injection pipeline 21 caused by installing the flow meter 24 on the safety injection pipeline 21, and ensuring the accuracy of flow measurement during the safety injection test.

[0132] Moreover, the execution of the MAP test in the safety injection system can effectively verify whether the relationship between the volume of the safety injection tank 2 and the liquid level meets the design requirements, thereby ensuring the rationality of the liquid level instrument setting value, greatly improving the safety of the unit, and also greatly improving the convenience of the test, effectively reducing the test cost and shortening the test cycle.

[0133] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0134] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0135] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A performance verification test system for a passive safety injection system, characterized in that, include: The make-up flow channel extends at one end into the gas space of the injection box; The water supply channel extends at one end into the liquid space of the injection tank; The safety injection tank is equipped with a safety injection line and a condensate drain line. One end of the safety injection line extends to the reactor pressure vessel, and the other end of the condensate drain line extends to a water storage tank. A level gauge is installed inside the safety injection tank, and a temporary test flow meter is installed on the condensate drain line. It also includes a control system, which is used during the MAP test to collect data on the changes of the level gauge and the flow meter over time to obtain a first target relationship between the outflow volume of the injection tank and the liquid level; The control system is used to collect data from the level gauge and obtain a second objective relationship between the liquid level in the injection tank and time during the injection test. The flow rate values ​​at different times during the safety injection test are calculated using the first objective relation and the second objective relation.

2. The performance verification test system for the passive injection system according to claim 1, characterized in that, The first objective relation is: dV / dL; In the MAP test, the level gauge measures the change in liquid level in the injection tank over time, L(t); the flow meter measures the change in cumulative outflow volume in the injection tank over time, V(t). Based on the time-varying data L(t) of the liquid level in the injection tank and the time-varying data V(t) of the cumulative outflow volume in the injection tank, the relationship between the outflow volume and the liquid level in the injection tank is obtained by fitting the data. The derivative of V(L) is then used to obtain dV / dL.

3. The performance verification test system for the passive injection system according to claim 2, characterized in that, The relationship between the liquid level in the injection tank and time is expressed as dL / dt; The liquid level gauge measures the change in liquid level in the injection tank over time, L(t), during the injection test, and calculates its derivative to obtain dL / dt. The product of the first objective relation and the second objective relation yields the change data Q of the injection flow rate over time during the injection test, where, Q = dV / dt.

4. The performance verification test system for the passive injection system according to claim 3, characterized in that, The injection tank is also equipped with a pressure measuring mechanism, which is used to measure the pressure value inside the injection tank. The resistance of the passive safety injection system is calculated using the pressure value, the bottom elevation of the safety injection tank, and the elevation of the pressure vessel flange face; wherein... The formula for calculating the resistance is: R = ΔH / Q 2 ; Where △H is the sum of the bottom elevation of the injection tank, the liquid level in the injection tank, and the pressure value in the injection tank, minus the elevation of the pressure vessel flange face, and Q is the change data of the injection flow rate over time during the injection test.

5. The performance verification test system for the passive injection system according to claim 4, characterized in that, The shape of the ampoule container includes spherical and cylindrical shapes; wherein... The formula for calculating V(L) of the spherical injection tank is: V(L)=A1L 6 +B1L 5 +C1L 4 +D1L 3 +E1L 2 +F1L+G1: The formula for calculating V(L) of the cylindrical injection tank is: V(L)=A1L+B1.

6. The performance verification test system for the passive injection system according to claim 4, characterized in that, An air compressor and an air supply control valve are sequentially installed on the air supply duct. The water replenishment channel is sequentially equipped with a demineralized water tank, an inlet control valve, a water replenishment pump, and another water replenishment control valve. The control system is communicatively connected to the air compressor, the air replenishment control valve, the water inlet control valve, the water replenishment pump, and the water replenishment control valve, respectively. It also includes a data acquisition system, which is communicatively connected to the pressure measuring mechanism, the level gauge and the flow meter.

7. The performance verification test system for the passive injection system according to claim 1, characterized in that, The drainage pipeline is equipped with a drainage valve, and the injection pipeline is equipped with an injection control valve.

8. A performance verification test method for a passive safety injection system, characterized in that, The performance verification test system for the passive injection system as described in any one of claims 1-7 is used, and the test method includes: Step 1: In the MAP test, the liquid level in the injection tank changes over time (L(t)) and the cumulative outflow volume in the injection tank changes over time (V(t)) using a level gauge and a flow meter, respectively. Step 2: Based on the data of the liquid level in the injection tank changing over time L(t) and the data of the cumulative outflow volume in the injection tank changing over time V(t), fit the relationship between the outflow volume in the injection tank and the liquid level in the injection tank V(L), and take the derivative of V(L) to obtain dV / dL; Step 3: Use a level gauge to measure the change in liquid level in the injection tank over time, L(t), and calculate its derivative to obtain dL / dt; Step 4: Multiply the dV / dL and the dL / dt to obtain the change data Q of the injection flow rate over time during the injection test; where Q = dV / dt.

9. The performance verification test method for the passive injection system according to claim 8, characterized in that, Before step 1, the following is included: Step 11: Before the MAP test, connect the drain line after the drain valve of the injection tank, install a temporary test flow meter on the drain line, and then place the outlet end of the drain line in the water storage tank. Step 12: Complete the measurement of safety injection parameters; including measuring the bottom elevation of the safety injection tank and the elevation of the reactor pressure vessel flange face; Step 13: Using the control system, open the inlet control valve, the water supply pump, and the water supply control valve to transport the demineralized water in the demineralized water tank to the injection tank through the water supply channel. When the liquid level in the injection tank reaches the test requirements, close the inlet control valve, the water supply pump, and the water supply control valve.

10. The performance verification test method for the passive injection system according to claim 9, characterized in that, Step 1 includes: After the control system is turned on, the drain valve and the air supply control valve are opened, and the demineralized water in the injection tank is discharged to the water storage tank under the action of gravity. The liquid level in the injection tank changes with time L(t) and the drain flow rate changes with time q(t). The cumulative outflow volume in the injection tank changes with time V(t) by accumulating the q(t).

11. The performance verification test method for the passive injection system according to claim 10, characterized in that, Step 3 includes: Step 31: Close the drain valve, and replenish the demineralized water into the injection tank again through the water replenishment pump. After the liquid level in the injection tank reaches the required value for the test, close the water replenishment pump, the water inlet control valve and the water replenishment control valve. Step 32: Turn on the air compressor and the air replenishment control valve through the control system, and inject gas into the safety injection box through the air replenishment channel to pressurize the safety injection box. When the pressure of the safety injection box reaches the test value, turn off the air compressor and the air replenishment control valve. Step 33: After activating the data acquisition system, open the injection control valve. Water in the injection tank is injected into the reactor pressure vessel under the influence of gas pressure and gravity, and overflows through the flange into the reactor sump. Record the pressure change data P(t) in the injection tank over time and the liquid level change data L(t) in the injection tank over time; where L(t) = A³t 3 +B3t 2 +C3t+D4; Step 34: Take the derivative of L(t) to obtain dL / dt.

12. The performance verification test method for the passive injection system according to claim 11, characterized in that, The method also includes step 5, which calculates the driving force ΔH in the injection channel test based on the measured installation bottom elevation H1 of the injection tank, the liquid level change data L(t) in the injection tank over time, the flange elevation H2 of the reactor pressure vessel, and the pressure change data P(t) in the injection tank over time; where ΔH=(H1+L(t)+P(t) / ρg-H2); Based on the driving force ΔH and the value of Q, the resistance R of the injection channel is calculated; where R = ΔH / Q 2 .

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