Helium leak detection sensitivity calibration and adjustment system and method for steam generator heat transfer tubes

Abstract

The application discloses a kind of steam generator heat transfer tube helium leak detection sensitivity calibration and adjusting system and method, system includes: total gas inlet pipe and total gas outlet pipe;Several connection between the total gas inlet pipe and the total gas outlet pipe gas storage assembly, each the gas storage assembly includes gas storage tank, installs on the gas inlet electronic valve of gas storage tank import and the gas outlet electronic valve on export;Gas pump and first total valve are installed on total gas outlet pipe;Second total valve is installed on the total gas inlet pipe.The application can adapt to the demand of nuclear power detection equipment timing calibration, and can be timed to automatically carry out sensitivity calibration.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of nuclear power detection equipment, and particularly relates to a steam generator heat pipe helium leak detection sensitivity calibration and adjustment system and method. BACKGROUND

[0002] Nuclear power facilities are divided into primary and secondary circuits according to radiation characteristics: boric acid water in the primary circuit cools the nuclear fuel rods and carries out the heat of the nuclear fuel rod fission reaction; since the boric acid water in the primary circuit contacts the nuclear fuel rods, it is radioactive, and in order to prevent the leakage of radioactive substances in the primary circuit, the heat needs to be conducted out to generate steam; the secondary circuit receives the heat conducted out by the primary circuit to generate high-temperature and high-pressure steam to drive the generator to generate electricity. The steam generator physically isolates the primary circuit from the secondary circuit and conducts the heat of the primary side to the secondary side through the heat pipe to generate steam. The heat pipe bundle is dense and the pipe wall is very thin, and is easily corroded and mechanically damaged. It is extremely important to quickly and timely detect cracks and perforations of the heat pipe caused by corrosion and wear to prevent radioactive leakage.

[0003] A steam generator helium mass spectrometric leak detection system and leak detection method with the application number 201811575080.8 is disclosed, which includes a suction gun positioning device, a suction gun assembly, a flow control system, a helium mass spectrometric leak detection instrument system, a physical data measurement system, a data acquisition and analysis system. The system fills a certain concentration of high-pressure helium in the secondary side of the steam generator, and the gas in different heat pipes is extracted by the purging sniffing system and sent to the mass spectrometer in batches; when the heat pipe has cracks or other damages, the high-pressure helium in the secondary side will penetrate into the damaged heat pipe, causing the helium concentration in the corresponding heat pipe to increase, which is extracted by the purging sniffing system and sent to the mass spectrometer, and the reading of the mass spectrometer increases, thereby indicating that the heat pipe has a leak. However, the system and the commercially available Cegelec steam generator heat pipe helium leak detection system have a specification that the sensitivity and response time of the nuclear power helium leak detection equipment are calibrated every 4 hours, and manual calibration is adopted: at the time when the sensitivity and response time need to be calibrated, the calibration tank filled with high-pressure helium is manually installed into the primary side purging gas path, the calibration tank gas path valve is opened, and the detection personnel are notified to start calibration. In this process, the following problems exist: the calibration tank stores high-pressure helium, which has a risk of leakage, thereby causing insufficient calibration gas; the speed of injecting high-pressure helium in the calibration tank into the primary side purging gas path is related to the pressure of the helium and the structure of the gas path, and there is a possibility that the sensitivity and response time calibration will not pass due to slow gas injection; the calibration tank needs personnel to enter the nuclear island in time for manual connection, which increases the radiation risk of the detection personnel. Therefore, it is necessary to design a gas leak detection sensitivity calibration and adjustment system. SUMMARY

[0004] The present application aims to provide a steam generator heat transfer tube helium leak detection sensitivity calibration and adjustment system and method, which can adapt to the needs of nuclear power detection equipment timing calibration and can automatically calibrate sensitivity at regular intervals.

[0005] To solve the above technical problems, the present application adopts the following technical scheme: a steam generator heat transfer tube helium leak detection sensitivity calibration and adjustment system, which comprises: a total gas inlet pipe and a total gas outlet pipe; a plurality of gas storage assemblies connected between the total gas inlet pipe and the total gas outlet pipe, each of the gas storage assemblies comprising a gas storage tank, an inlet electronic valve installed on the inlet of the gas storage tank, and an outlet electronic valve installed on the outlet of the gas storage tank; a gas pump and a first total valve installed on the total gas outlet pipe; and a second total valve installed on the total gas inlet pipe.

[0006] Optimally, the system further comprises a control and communication module for controlling the first total valve, the second total valve, the outlet electronic valve, the inlet electronic valve, and the gas pump.

[0007] Optimally, the gas storage assembly further comprises a status indicator lamp controlled by the control and communication module and used to display whether the standard gas helium in each of the gas storage tanks is full.

[0008] Optimally, the gas storage assembly further comprises a button controlled by the communication module and used to reset the status of the standard gas helium in the gas storage tank.

[0009] Optimally, a manual valve is connected to the inlet and the outlet of each of the gas storage tanks, respectively.

[0010] The present application also provides an adjustment method based on the above system, which is used to provide standard gas helium for a helium leak detection system and calibrate and adjust the standard gas helium, and comprises the following steps:

[0011] a. Connect the sensitivity calibration and adjustment system to the helium leak detection system, connect the total gas inlet pipe in the sensitivity calibration and adjustment system to the standard gas flushing interface of the helium leak detection system, and connect the gas path standard gas total gas outlet pipe in the sensitivity calibration and adjustment system to the standard gas injection interface of the helium leak detection system, and ensure the airtightness of the two connections;

[0012] b. Connect all the helium gas storage tanks to the gas path in the sensitivity calibration and adjustment system, respectively, and confirm the airtightness of the gas storage tank connections; after confirming that the airtightness of the gas storage tank connections is good, open the manual valves of the gas storage tanks;

[0013] c. Clear the installation and system status of the gas storage tanks, output the signal that the gas storage tanks are full of normal pressure helium and have not been used to the control and communication module and through the communication interface to the helium leak detection system;

[0014] d. After the helium leak detection system works for h hours, the system industrial computer in the helium leak detection system counts and confirms that the sensitivity and response time calibration needs to be performed once, and the system industrial computer sends a calibration command to the control and communication module to perform calibration once;

[0015] e. The control and communication module receives the calibration command and injects the calibration gas helium in a certain gas tank into the one-loop purge gas path in sequence: the first calibration after the helium leak detection system works for h hours, the gas tanks are filled with normal pressure helium and are not used, the first total valve and the second total valve are opened;

[0016] f. One of the electromagnetic gas valves corresponding to the gas tank is opened, the electromagnetic gas valves corresponding to the remaining gas tanks are closed, the gas pump is started, and the gas pump extracts air in the one-loop purge gas path from the total air inlet pipe, and injects the calibration gas helium in the gas tank into the one-loop purge gas path from the total air outlet pipe; the air extraction rate of the gas pump needs to be determined according to the air extraction rate in the one-loop purge gas path, and the helium concentration in the mixed gas generated by filling the calibration gas helium into the one-loop purge gas path should meet the sensitivity calibration requirements;

[0017] g. When the calibration gas helium in the currently connected gas tank is extracted, the control and communication module stops the operation of the gas pump, and informs the helium leak detection system through the communication interface that the calibration gas helium injection is completed, the response time is tested, and it is informed that the calibration gas helium in the gas tank is consumed; the control and communication module indicates that the calibration gas helium in the gas tank is consumed;

[0018] h. Repeat steps f-g to sequentially connect other gas tanks until the helium leak detection is completed.

[0019] The beneficial effects of the present application are that the present application can adapt to the needs of nuclear power detection equipment timing calibration, and can automatically perform sensitivity calibration at regular intervals; the present application can control the injection amount and injection speed of the calibration gas, and meet the requirements of the minimum calibration sensitivity of the nuclear power steam generator heat pipe equipment; the present application uses multiple normal pressure helium calibration gas tanks, cooperates with electromagnetic gas valves, avoids the leakage of high-pressure calibration gas tanks, and can be installed in the system for a long time, does not need to be installed in the system within the specified sensitivity calibration time, and can be automatically calibrated for several times in succession; the present application realizes automatic sensitivity calibration, does not need manual intervention in the calibration process, makes the reaction time test of the tracer gas detection more accurate, and eliminates the delay time caused by manual injection of the tracer gas. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the principle schematic diagram of the present application. DETAILED DESCRIPTION

[0021] The present application will be described in detail below in combination with the embodiments shown in the drawings:

[0022] A steam generator heat transfer tube helium leak detection sensitivity calibration and adjustment system includes: a main inlet pipe 26 and a main outlet pipe 27; several gas storage components connected between the main inlet pipe 26 and the main outlet pipe 27, each gas storage component including a gas storage tank, an inlet electronic valve installed at the inlet of the gas storage tank and an outlet electronic valve installed at the outlet of the gas storage tank, and manual valves respectively connected to the inlet and outlet of each gas storage tank; a gas pump 25 installed on the main outlet pipe 27; a first main valve 23; a first external pipe 29 for connecting the main outlet pipe 27 to the atmosphere; and a first external electronic valve 24 installed on the first external pipe 29 for connecting the main inlet pipe 26 to the atmosphere. The system includes a second external pipe 28 connecting the gas pipe 26 to the atmosphere, and a second external electronic valve 18 installed on the second external pipe 28; a second main valve 17 installed on the main inlet pipe; a control and communication module 30 for controlling the first main valve 23, the second main valve 17, the outlet electronic valve, the inlet electronic valve, the external electronic valve, and the air pump 25; a button 31 and status indicator lights corresponding to the gas storage tanks, the status indicator lights being controlled by the control and communication module 30 and used to display whether the standard helium gas in each of the gas storage tanks is full, and the button being controlled by the control and communication module 30 and used to reset the standard helium gas status in the gas storage tanks.

[0023] like Figure 1 As shown, in this embodiment, there are four gas storage components: a first gas storage component, a second gas storage component, a third gas storage component, and a fourth gas storage component. The first gas storage component includes a first gas storage tank 1, a first inlet electronic valve 13 installed at the inlet of the first gas storage tank, a first outlet electronic valve 19 installed at the outlet of the first gas storage tank, and a first inlet manual valve 5 connected to the inlet of the first gas storage tank and a first outlet manual valve 6 connected to the outlet of the first gas storage tank. The second gas storage component includes a second gas storage tank 2, a second inlet electronic valve 14 installed at the inlet of the second gas storage tank, and a second outlet electronic valve 20 installed at the outlet of the second gas storage tank. The first gas storage assembly includes a second inlet manual valve 7 and a second outlet manual valve 8. The third gas storage assembly includes a third gas storage tank 3, a third inlet electronic valve 15 installed at the inlet of the third gas storage tank and a third outlet electronic valve 21 installed at the outlet, and a third inlet manual valve 9 connected to the inlet of the third gas storage tank and a third outlet manual valve 10 connected to the outlet of the third gas storage tank. The fourth gas storage assembly includes a fourth gas storage tank 4, a fourth inlet electronic valve 16 installed at the inlet of the fourth gas storage tank and a fourth outlet electronic valve 22 installed at the outlet, and a fourth inlet manual valve 11 connected to the inlet of the fourth gas storage tank and a fourth outlet manual valve 12 connected to the outlet of the fourth gas storage tank. The status indicator lights are respectively a first indicator light 32 corresponding to the first gas storage tank 1, a second indicator light 33 corresponding to the second gas storage tank 2, a third indicator light 34 corresponding to the third gas storage tank 3, and a fourth indicator light 35 corresponding to the fourth gas storage tank 4.

[0024] The adjustment method based on the above system is as follows:

[0025] (a) Connect the sensitivity calibration and adjustment system to the helium leak detection system one loop purge system, the total gas inlet pipe 26 in the sensitivity calibration and adjustment system is connected to the helium leak detection system one loop purge standard gas flushing interface; the total gas outlet pipe 27 in the sensitivity calibration and adjustment system is connected to the helium leak detection system one loop standard gas injection interface, and the air tightness of the two connections is ensured;

[0026] (b) Connect the first gas storage tank 1, the second gas storage tank 2, the third gas storage tank 3, and the fourth gas storage tank 4 to the gas path of the sensitivity calibration and adjustment system respectively, and confirm the air tightness of the gas storage tank connections; after confirming that the air tightness of the gas storage tank connections is good, open all the manual valves, and connect the first gas storage tank 1, the second gas storage tank 2, the third gas storage tank 3, and the fourth gas storage tank 4 to the gas path of the sensitivity calibration and adjustment system;

[0027] (c) Press the gas storage tank installation and system state zero button 31, and inform the control and communication module 30 that the first gas storage tank 1, the second gas storage tank 2, the third gas storage tank 3, and the fourth gas storage tank 4 are full of normal pressure helium and have not been used; the control and communication module 30 informs the helium leak detection system of this information through the communication interface;

[0028] (d) The helium leak detection system sends indicator light state control information through the communication interface, and the control and communication module 30 receives the control information to control the first indicator light 32, the second indicator light 33, the third indicator light 34, and the fourth indicator light 35 to be off, indicating that the first gas storage tank 1, the second gas storage tank 2, the third gas storage tank 3, and the fourth gas storage tank 4 are full of normal pressure helium and have not been used;

[0029] (e) After the helium leak detection system has been working for 4 hours, the system industrial computer in the helium leak detection system counts and confirms that sensitivity and response time calibration needs to be performed once, and the system industrial computer sends a calibration command to the control and communication module 30 to perform calibration once;

[0030] (f) The control and communication module 30 receives the calibration command and sequentially injects the standard gas helium in a certain gas storage tank into the one loop purge gas path: assuming that it is the first calibration after the helium leak detection system has been working for 4 hours, the first gas storage tank 1, the second gas storage tank 2, the third gas storage tank 3, and the fourth gas storage tank 4 are full of normal pressure helium and have not been used, the first total valve 23, the second total valve 17, and the corresponding first gas inlet electronic valve 13 and first gas outlet electronic valve 19 are opened, the remaining electromagnetic valves are closed, the gas pump 25 is started, and the gas pump 25 extracts air in the one loop purge gas path from the total gas inlet pipe 26, and injects the standard gas helium in the gas storage tank 1 into the one loop purge gas path from the total gas outlet pipe 27; the air extraction rate of the gas pump 25 needs to be determined according to the air extraction rate in the one loop purge gas path, and the helium concentration in the mixed gas generated by charging the standard gas helium into the one loop purge gas path should meet the sensitivity calibration requirements;

[0031] (g) When the standard gas helium in the first gas tank 1 is exhausted, the control and communication module 30 stops the operation of the air pump 25, and informs the system industrial computer in the helium leak detection system through the communication interface that the standard gas helium injection is completed, starts timing the response time, and informs that the standard gas helium in the gas tank 1 is exhausted; the control and communication module 30 controls the state indicator light 32 to be on, indicating that the standard gas helium in the gas tank 1 is exhausted;

[0032] (h) The control and communication module 30 controls the first external electronic valve 24 and the second external electronic valve 18 to be opened, preventing the standard gas in the unused gas tanks 2, 3, and 4 from seeping into the one-loop purge gas path, affecting the leakage measurement of the helium leak detection;

[0033] (i) When the sensitivity and response time calibration is performed for the second time, the first total valve 23, the second total valve 17, and the corresponding second gas inlet electronic valve 14 and the second gas outlet electronic valve 20 are opened, the remaining electromagnetic valves are closed, the air pump 25 is started, and the air pump 25 extracts the air in the one-loop purge gas path from the total gas inlet pipe 26, and injects the standard gas helium in the gas tank 2 into the one-loop purge gas path from the total gas outlet pipe 27;

[0034] (j) When the standard gas helium in the second gas tank 2 is exhausted, the control and communication module 30 stops the operation of the air pump 25, and informs the system industrial computer in the helium leak detection system through the communication interface that the standard gas helium injection is completed, starts timing the response time, and informs that the standard gas helium in the gas tank 2 is exhausted; the control and communication module 30 controls the state indicator light 33 to be on, indicating that the standard gas helium in the gas tank 2 is exhausted;

[0035] (k) The extraction of the standard gas helium in the third gas tank 3 and the fourth gas tank 4 is completed in sequence according to steps i and j;

[0036] (l) When the standard gas helium in the first gas tank 1, the second gas tank 2, the third gas tank 3, and the fourth gas tank 4 is all exhausted and the helium leak detection is not completed, the processes (b)~(k) are repeated until the helium leak detection is completed.

[0037] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit of the present application should be covered within the protection scope of the present application.

Claims

1. A method of adjusting a steam generator heat transfer tube helium leak detection sensitivity calibration and adjustment system, the steam generator heat transfer tube helium leak detection sensitivity calibration and adjustment system comprising: A total gas inlet pipe and a total gas outlet pipe; a plurality of gas storage assemblies connected between the total gas inlet pipe and the total gas outlet pipe, each of the gas storage assemblies comprising a gas storage tank, an inlet electronic valve installed on the inlet of the gas storage tank, and an outlet electronic valve installed on the outlet of the gas storage tank; a gas pump and a first total valve installed on the total gas outlet pipe; a second total valve installed on the total gas inlet pipe; the system further comprises a control and communication module for controlling the first total valve, the second total valve, the outlet electronic valve, the inlet electronic valve, and the gas pump; the gas storage assembly further comprises a status indicator lamp controlled by the control and communication module and used for displaying whether the standard gas helium in each of the gas storage tanks is full; the gas storage assembly further comprises a button controlled by the control and communication module and used for resetting the status of the standard gas helium in the gas storage tank; a manual valve is connected to the inlet and the outlet of each of the gas storage tanks, respectively; The adjusting method is used for providing standard gas helium for a helium leak detection system and calibrating and adjusting the standard gas helium, and is characterized in that the adjusting method comprises the following steps: a. connecting the sensitivity calibration and adjustment system to the helium leak detection system, wherein the total gas inlet pipe in the sensitivity calibration and adjustment system is connected to a helium leak detection system one-loop purge standard gas flushing interface; the gas path standard gas total outlet pipe in the sensitivity calibration and adjustment system is connected to a helium leak detection system one-loop standard gas injection interface, and the air tightness of the two connection positions is ensured; b. connecting all the helium storage tanks to the gas path of the sensitivity calibration and adjustment system, respectively, and confirming the air tightness of the connection positions of the helium storage tanks; after confirming that the air tightness of the connection positions of the helium storage tanks is good, the manual valve of the helium storage tank is opened; c. resetting the installation and system status of the helium storage tank, outputting a signal that the helium storage tank is full of normal pressure helium and is not used to the control and communication module and through the communication interface to the helium leak detection system; d. after the helium leak detection system works continuously for h hours, the system industrial computer in the helium leak detection system counts and confirms that the sensitivity and response time calibration needs to be performed once, and the system industrial computer sends a calibration command to the control and communication module to perform calibration once; e. the control and communication module receives the calibration command and injects the standard gas helium in a certain helium storage tank into the one-loop purge gas path in sequence: the first calibration after the helium leak detection system works for h hours, the helium storage tanks are full of normal pressure helium and are not used, and the first total valve and the second total valve are opened; f. one of the electromagnetic gas valves corresponding to the helium storage tank is opened, the electromagnetic gas valves corresponding to the remaining helium storage tanks are closed, the gas pump is started, the gas pump extracts the air in the one-loop purge gas path from the total gas inlet pipe, and the standard gas helium in the helium storage tank is injected into the one-loop purge gas path from the total gas outlet pipe; the air extraction rate of the gas pump needs to be determined according to the air extraction rate in the one-loop purge gas path, and the helium concentration in the mixed gas generated by the standard gas helium filled into the one-loop purge gas path should meet the sensitivity calibration requirement; g. when the standard gas helium in the currently connected helium storage tank is extracted, the control and communication module stops the operation of the gas pump, informs the helium leak detection system through the communication interface that the standard gas helium injection is completed, starts the timing test of the response time, and informs that the standard gas helium in the helium storage tank is consumed; the control and communication module indicates that the standard gas helium in the helium storage tank is consumed. h. Repeat steps f-g for each additional gas reservoir until helium leak detection is complete.

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