CN105157923B - Method for testing tightness of isolation valve group at inlet and outlet of containment closed loop - Google Patents
Method for testing tightness of isolation valve group at inlet and outlet of containment closed loop Download PDFInfo
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- CN105157923B CN105157923B CN201510418761.3A CN201510418761A CN105157923B CN 105157923 B CN105157923 B CN 105157923B CN 201510418761 A CN201510418761 A CN 201510418761A CN 105157923 B CN105157923 B CN 105157923B
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Abstract
The invention relates to a containment inlet/outlet isolation valve block tightness test method, which comprises the following steps: confirming an inlet and outlet isolation valve bank needing to be subjected to a sealing test; a pressurizing interface is arranged on a closed loop in the containment; pressurizing one side of the inlet and outlet isolating valve group from the pressurizing interface; a branch leakage path is arranged on a loop in the containment; an air interface and a branch isolating valve are sequentially arranged on the branch; a leak test was performed and a leak rate calculation was performed. The test method can detect whether the sealing performance of the containment inlet/outlet isolation valve bank meets the requirement or not; simple structure, the practicality is strong.
Description
Technical Field
The invention belongs to the field of sealing tests, and particularly relates to a method for testing the sealing performance of an upper inlet and outlet isolating valve group of a containment closed loop.
Background
In a pressurized water reactor nuclear power plant, a fuel cladding, a primary circuit pressure boundary and a containment form three barriers for shielding radioactive substances in the nuclear power plant, wherein the containment is the third barrier for preventing the radioactive substances from being released in the nuclear power plant and the last barrier. When an accident such as a primary loop pipeline breach occurs in the nuclear power plant, the mass energy discharged into the containment vessel and the corresponding radioactive substance are contained in the containment vessel, the radioactive substance is prevented from being released to the atmosphere outside the containment vessel, and workers in the plant and public people outside the plant are protected from radioactive hazards.
The third safety barrier comprises a prestressed concrete building with a steel sealing lining on the inner surface, a two-loop water vapor part positioned in a safety shell inner pipeline, a safety shell isolation system and the like. The containment isolation system comprises all containment isolation valves, and is closed according to the radioactive shielding requirement under an accident.
The containment isolation valve needs to carry out a pressurization test on the leakage rate of the valve during debugging and normal operation of a power plant so as to test the sealing performance of the valve, and a corresponding test interface needs to be arranged during system design. For different containment vessel isolation valves, the traditional pressurized water reactor nuclear power plant tightness test method comprises a pressure reduction method, a flow method and the like; the corresponding test configurations and the corresponding system designs are also different depending on the test method. A pressure attenuation method can be adopted for the containment vessel penetrating piece isolation valve with gas as a medium, a pipeline where the isolation valve is located is filled with certain gas during testing, the pressure is gradually reduced along with valve leakage, and the leakage rate of the isolation valve is obtained by utilizing pressure change.
The containment penetration isolation valve with the medium of gas or liquid in the pipeline is characterized in that a periodical leak tightness test mainly adopts a flow method and is further divided into a leakage recovery measuring method, a replenishment measuring method and a poor measuring method, the pressure in a test system (generally, the containment design pressure) is kept constant by continuously replenishing the gas or liquid flow during the test, and the valve leakage rate is obtained by using the measured flow.
When the flow method is adopted for testing, a leakage recovery bottle, a test bottle or a rotor flowmeter is needed. The test bottle is used for pressurizing the liquid medium to a containment design pressure value and measuring the total leaked liquid volume, and the leakage recovery bottle is used for the liquid medium and is used for measuring the volume of the recovered liquid; the rotameter is used for gas media and is used for measuring the volume of supplemented or recycled gas; the test configuration is shown in fig. 4, for simplicity, the containment penetration isolation valves discussed later assume that the media flowing through the valve are all liquid, and for isolation valves using gaseous media, the test method is the same as for isolation valves using liquid media, except for the difference in flow measurement devices.
Different flow measurement methods for liquid media are illustrated in the following table:
① can be pressurized through the pressurized interface while giving a total leakage.
② the valve leakage rate is obtained by dividing △ t (the test dwell time is usually 0.5 h).
③ the first step is to obtain the leakage rate of valve A, the second step is to obtain the leakage rate of valve A + C, and then obtain the leakage rate of valve C
With the improvement of the safety requirement of the nuclear power plant, a series of passive systems adopting the principles of natural circulation and the like are arranged, which provides a challenge for the tightness test method adopted by the traditional active nuclear power plant.
In a traditional containment vessel isolation valve tightness test, a boundary valve needs to be closed to prevent other fluids from flowing in or uncontrollably losing fluids needing to be recovered, and therefore an isolation valve needs to be arranged on a pipeline where the containment vessel isolation valve is located. In a general mechanical system, a relevant (manual, automatic) valve is arranged for the reasons of online, maintenance and the like, so as to meet the requirements of operation, maintenance and the like. During the containment isolation test, the test boundary can be isolated by the valve.
But for the following (but not limited to) circuit, as shown in fig. 5:
1. is a closed loop in a containment
2. The closed loop is provided with an inlet and an outlet isolation valve
3. Besides, no other isolation equipment is arranged on the main pipeline
When the containment vessel isolation valve is used for a tightness test, if a leakage recovery method (taking 001VD in FIG. 5 as an example) is adopted, an isolation valve needs to be added at the downstream of 001 VD; the adoption of the flow compensation method also needs to add an isolation valve at the downstream of 001 VD; the adoption of the worse method needs to add an isolation valve on the main pipeline between 001VD and 002VD, and needs to add an isolation valve at the downstream of 001 VD. The traditional flow method cannot be directly applied due to the lack of corresponding isolation valves on the main pipeline.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for testing the tightness of an isolation valve group at an inlet and an outlet of a containment closed loop, which can detect whether the tightness of the isolation valve group meets the requirement of safety criteria without adding an isolation valve; simple and reliable, and strong practicability.
In order to achieve the above purposes, the invention adopts the technical scheme that: the method for testing the tightness of the isolating valve group at the inlet and the outlet of the closed containment loop comprises the following steps:
a. confirming an isolation valve group which needs to be subjected to a sealing test;
b. a closed loop in the containment is provided with a pressurizing interface for pressurizing one side of the isolation valve group;
c. confirming the leakage path of the branch pipe on the closed loop;
d. an air interface and a branch pipe isolation valve are arranged on the branch pipe;
e. a seal test was performed.
Further, in step b, the other side of the isolation valve group is vented to the atmosphere or is maintained in a pressurized state.
Further, in step b, a pressurizing device for measuring the total leakage amount is arranged on the pressurizing interface.
Further, in step d, a branch pipe leakage recovery device is arranged on the empty interface.
Further, in step e, the test is finished, and the leakage rate of the isolating valve group is calculated.
Further, if the result of the leakage rate meets the requirement, the test is ended; and if the result of the leakage rate does not meet the requirement, checking and overhauling the isolation valve group, and then returning to the step e for retesting.
The invention has the beneficial technical effects that:
(1) the sealing performance of the inlet and outlet containment vessel isolation valves on the closed loop in the containment vessel is detected as valve groups, so that the sealing performance test speed is improved;
(2) the non-pressurized side of the containment vessel isolation valve is communicated with the atmosphere or the pressurized state is maintained, so that the influence of external pressure on the tightness test can be avoided;
(3) through set up the air interface on the branch pipe, can retrieve the branch pipe and go up the leakage fluid, avoid increasing isolation valve on the trunk line, optimized system performance.
(4) Through the tightness test, the requirement of the tightness test of the novel passive system is effectively met.
Drawings
FIG. 1 is a flow chart of a method of testing the sealability of an isolation valve block of the present invention;
FIG. 2 is a schematic structural diagram of a leak tightness test circuit of the isolating valve group of the present invention;
FIG. 3 is a flow diagram of a containment cooling system circuit;
FIG. 4 is a schematic view of a prior art flow-method test setup;
FIG. 5 is a schematic diagram of a prior art isolation valve set for an inlet and an outlet of a containment vessel.
In the figure:
1-containment 2-heat exchange water tank 3-heat exchanger 4-pressurization interface
5. 6-air interface
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the method for testing the tightness of the containment inlet and outlet isolation valve banks on the containment closed loop provided by the invention can detect the tightness of the containment inlet and outlet isolation valve banks, ensure that the tightness of the isolation valve banks meets the leakage rate requirement, and avoid the problem that radioactive substances are released to the atmosphere outside the containment to influence the safety of personnel outside the plant in the plant due to the fact that the isolation valves do not meet the requirement when an accident occurs in a nuclear power plant. The specific test method is as follows:
1) determining an isolation valve set to be tested
During testing, the leakage rate of a single isolation valve is not required to be obtained, and the inlet and outlet isolation valves 002VD and 001VD are used as an isolation valve group for carrying out the tightness test. As the whole leakage rate of the containment is the only safety criterion which needs to be enforced, the requirement of the safety criterion can be met as long as the leakage rate of the isolation valve bank is lower than the leakage rate limit value corresponding to the pipe diameter of the isolation valve bank (the pipe diameter of the 001VD isolation valve is added with that of the 002VD isolation valve).
2) The containment vessel isolation valve is selected, and the influence of the upstream/downstream pressure of the isolation valve on the sealing test is avoided and reduced during the selection
When a traditional flow method is adopted for testing, the boundary can be effectively isolated, so that the external pressure born by the containment isolation valve can be eliminated. However, for closed circuits within the housing, the effect of external pressure needs to be taken into account due to the lack of isolation valves.
When carrying out isolation valve leakproofness, suppress 001VD isolation valve, 002VD isolation valve from the shell, 001VD isolation valve, 002VD isolation valve do not suppress the side and require to lead to the atmosphere under the general condition simultaneously to avoid external pressure to influence the leakproofness test result. However, when the left sides of the 001VD isolation valve and the 002VD isolation valve are pressurized to cause the sealing test result to be more conservative, the pressurized state can be maintained without emptying. If the safety shell isolation valve adopts a gate valve, when the gate valve is pressurized from the right side, the left side of the valve is poorer in sealing performance when pressurized than when the left side of the valve is communicated with the atmosphere, the corresponding measured leakage rate is more conservative, and the left side of the valve can be kept in a pressurized state in consideration of the convenience of operation.
This clause is summarized as follows:
(a) when a containment isolation valve on a closed loop in a containment is subjected to a sealing test, the influence of external pressure borne by the isolation valve on the sealing test needs to be considered;
(b) the non-pressurizing side of the containment isolation valve is generally required to be communicated with the atmosphere;
(c) if the term (b) is difficult to satisfy, a specific type of containment isolation valve should be selected to avoid or reduce the influence of external pressure on the tightness test.
3) Providing a pressurized interface
The pressurizing interface 4 is required to be arranged on a closed loop pipeline in the containment to pressurize the isolation valve from the inside of the containment, and meanwhile, a pressurizing device is arranged on the pressurizing interface to measure the total leakage amount.
4) Providing an air interface
The leakage of the 001VD isolation valve and the 002VD isolation valve cannot be directly measured, and for this reason, the leakage is indirectly measured by the following method: leakage amount of containment isolation valve bank is total leakage amount-leakage through other ways
For this purpose, it is necessary to collect possible leaks by other means, and the air interface is provided with corresponding possible leak paths and provided with leak collecting means for collecting the amount of leaks.
Other possible routes of leakage include non-mains valves such as 003VD traps, 004VD traps, or mains recuperator 3, as shown in FIG. 3. Leakage through the trap can be accurately collected by adding an isolation valve 005VD, 006VD downstream of the trap and an empty port 5, 6, as shown in fig. 2. The leakage through the heat exchanger 3 is generally small and can be ignored, the small leakage amount can be added into the leakage of the containment isolation valve, and the test result is more conservative.
5) Performing leak rate tests and leak rate calculations
And (3) after the steps 1-4 are finished, executing a sealing test, closing all related isolation valves during the test, pressurizing through the pressurizing connector 4, collecting the total leakage amount, recovering the leakage amount through other ways through the empty connectors 5 and 6, and maintaining the pressure for 0.5 hour during the test.
The leak rate calculation method is as follows:
containment isolation valve leak rate ═ total leak amount-leak amount through other routes ]/△ t
Wherein △ t is the dwell time during the test.
And (4) checking whether the leakage rate of the isolation valve meets the requirement or not according to the containment leakage rate criterion, and if the leakage rate of the isolation valve does not meet the requirement, checking and repairing the valve and then testing the valve again until the leakage rate of the containment meets the requirement of the safety criterion.
In order to make the present invention more clear, a certain reactor type passive containment cooling system PCS is taken as an example for explanation.
As shown in figures 2 and 3, a loop in a containment vessel 1 of the system is provided with a heat exchanger 3, a loop outside the containment vessel 1 is provided with a heat exchange water tank 2, the system brings out heat in the containment vessel under the condition of a serious accident and cools the containment vessel in a passive mode, and the system can be provided with a plurality of water tanks and the heat exchanger 3. The system is started in the case of a serious accident, cold water at the heat exchanger 3 is heated by air in the shell, the loop starts natural circulation under the driving of gravity, and the cold water flows into the heat exchanger 3 through a 002VD isolation valve, is heated by the containment vessel and then returns to the heat exchange water tank 2 through a 001VD isolation valve.
Determining a containment isolation valve group:
the pipeline in the PCS system shell meets the requirement of a closed loop in the containment, an inlet and an outlet outside the containment can be respectively provided with an isolation valve, and the tightness test objects are a 001VD isolation valve and a 002VD isolation valve of the containment isolation valve group.
Confirm the effect of valve type and isolation valve upstream/downstream pressure on the sealability test:
in this example, 001VD isolating valve and 002VD isolating valve are the parallel double-gate valve of wedge-caulking type, and 001VD isolating valve and 002VD isolating valve left side normal operating bear water pressure in the heat transfer water tank 2, because the characteristic of gate valve, when the leakproofness is experimental, heat transfer water tank 2 can not the evacuation, and corresponding leakproofness test result is more conservative.
Setting a pressurizing interface:
a pressurizing interface 4 is arranged on a closed loop pipeline in the containment 1, and the total leakage amount can be obtained by pressurizing through the pressurizing interface 4.
Branch leak paths were identified:
during pressurizing, except a 001VD (vacuum distillation) isolating valve and a 002VD isolating valve, possible leakage ways are a 003VD drain valve, a 004VD drain valve and a heat exchanger 3, the heat exchanger 3 is of a safety level, the water quality and maintenance conditions of equipment are good, the pressurizing pressure during testing is less than or equal to 0.6MPa abs, the pressure is low, and the pressure is in the designed pressure range of the heat exchanger 3, so that the leakage through the heat exchanger 3 can be ignored, and possible trace leakage is counted in the leakage of the isolating valve.
Besides, 003VD steam trap and 004VD steam trap need to set an air interface.
Setting an air interface and an isolation valve:
set up isolation valve 005VD isolating valve and 006VD isolating valve in 003VD trap and 004VD trap's low reaches, and the 005VD isolating valve, 006VD isolating valve and other drain line keep apart, and set up empty interface 5 between 003VD trap and 005VD isolating valve, set up empty interface 6 between 004VD trap and 006VD isolating valve, every sets up the leakage recovery bottle to empty interface, with accurately collecting the leakage through the branch pipe.
Sealing tests were performed and leak rate calculations were performed:
the tightness test is carried out on 001VD and 002VD isolation valve banks, the isolation valve 001VD-006VD is closed during the test, the total leakage quantity Qt is obtained by pressurizing through a pressurizing interface, a leakage recovery bottle is connected with an empty interface, the leakage flow quantities Qr1 and Qr2 through a 003VD drain valve and a 004VD drain valve are collected, and the pressure is maintained for 0.5 hour during the test.
The leakage rate Q of the isolating valve bank is (Qt-Qr1-Qr2)/0.5
The leakage rate limit values of the 001VD isolation valve and the 002VD isolation valve are in direct proportion to the pipe diameters of the 001VD and 002VD isolation valves, and the coefficients are determined according to the total leakage rate limit value of the containment and the total pipe diameter of the containment isolation valve. And determining a leakage rate limit value according to the proportional coefficient and the sum of the pipe diameters of the 001VD isolation valve and the 002VD isolation valve, comparing the leakage rate limit value with the measured leakage rate, if the leakage rate limit value is lower than the measured leakage rate limit value, meeting the requirement, otherwise, checking the system and equipment, carrying out necessary maintenance on the isolation valve group, and re-executing the sealing test until the test result meets the limit value requirement.
The method for testing the tightness of the upper outlet and the upper outlet of the containment vessel closed loop is not limited to the above specific embodiment, and those skilled in the art can derive other embodiments according to the technical scheme of the invention, and the method also belongs to the technical innovation scope of the invention.
Claims (6)
1. The containment closed loop inlet and outlet isolating valve group tightness test method comprises the following steps:
a. confirming an isolation valve group which needs to be subjected to a sealing test, wherein during the test, the leakage rate of a single isolation valve is not required to be obtained, and the inlet and outlet isolation valves are used as the isolation valve group to be subjected to the sealing test;
b. a pressurizing interface for pressurizing one side of the isolation valve group is arranged on the closed loop in the containment, the pressurizing interface is required to be arranged on a pipeline of the closed loop in the containment so as to pressurize the isolation valve from the inside of the containment, and meanwhile, a pressurizing device is arranged on the pressurizing interface to measure the total leakage amount;
c. confirming the leakage path of the branch pipe on the closed loop;
d. the branch pipe is provided with an air interface and a branch pipe isolation valve, and the leakage of the inlet and outlet isolation valves cannot be directly measured, so that the leakage is indirectly measured by the following method: the leakage amount of the containment isolation valve bank is the total leakage amount, namely the leakage through other ways;
e. a seal test was performed.
2. The method for testing the tightness of the upper outlet isolation valve group on the closed containment loop as claimed in claim 1, wherein: in step b, the other side of the isolating valve group is communicated with the atmosphere or is maintained in a pressure state.
3. The method for testing the tightness of the upper outlet isolation valve group on the closed containment loop as claimed in claim 1, wherein: in step b, a pressurizing device for measuring the total leakage amount is arranged on the pressurizing interface.
4. The method for testing the tightness of the upper outlet isolation valve group on the closed containment loop as claimed in claim 1, wherein: in step d, a branch pipe leakage recovery device is arranged on the air interface.
5. The method for testing the tightness of the upper outlet isolation valve group on the closed containment loop as claimed in claim 1, wherein: in step e, the test is finished, and the leakage rate of the isolating valve group is calculated.
6. The method for testing the tightness of the upper outlet isolation valve group on the closed containment loop as claimed in claim 5, wherein: if the result of the leakage rate meets the requirement, the test is finished; and if the result of the leakage rate does not meet the requirement, checking and overhauling the isolation valve group, and then returning to the step e for retesting.
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| CN105869689B (en) * | 2016-06-21 | 2017-11-17 | 苏州科技大学 | A kind of device and method for measuring valve tiny leakage rate |
| CN109855814B (en) * | 2019-01-22 | 2020-11-06 | 中广核工程有限公司 | Method and system for detecting tightness of RCPB isolation valve of nuclear power plant |
| CN111028962A (en) * | 2019-12-30 | 2020-04-17 | 福建福清核电有限公司 | Method for evaluating tightness test of high-low pressure safety injection penetration piece of nuclear power station |
| CN111157193B (en) * | 2020-01-06 | 2022-01-21 | 岭东核电有限公司 | Nuclear power station sealing test method, sealing test device and electronic equipment |
| CN114061855B (en) * | 2021-10-22 | 2024-01-12 | 中核核电运行管理有限公司 | Nuclear power plant containment penetration piece tightness test operation system and method |
| CN114577413B (en) * | 2022-03-04 | 2023-10-24 | 中广核核电运营有限公司 | Isolation valve tightness test device |
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| JP4157466B2 (en) * | 2003-10-28 | 2008-10-01 | 株式会社東芝 | Valve leak detection system |
| CN101858817B (en) * | 2010-06-10 | 2012-06-27 | 北京冶核技术发展有限责任公司 | Equal-pressure virtual isolation check valve sealing test method and equipment |
| JP5728309B2 (en) * | 2011-06-30 | 2015-06-03 | 株式会社東芝 | Radioactive gas leakage measuring device and radioactive gas leakage measuring method |
| CN103033322B (en) * | 2012-12-26 | 2016-06-01 | 中国核动力研究设计院 | Nuclear power station main pump cooling water system runs through part segregaion valve sealing test method |
| CN203480851U (en) * | 2013-10-18 | 2014-03-12 | 中广核核电运营有限公司 | Online sealing performance detection equipment of reactor core measuring system of pressurized water reactor nuclear power plant |
| CN203732219U (en) * | 2014-03-04 | 2014-07-23 | 江苏核电有限公司 | Double-layer containment equipment gate seal leakage monitoring device |
| CN204010703U (en) * | 2014-06-04 | 2014-12-10 | 中国核电工程有限公司 | A kind of containment sump water cooling system of active, non-active combination |
| CN104103326B (en) * | 2014-06-25 | 2017-01-25 | 中国核电工程有限公司 | Device used for sealing detection on containment outer isolation valve |
| CN104266805B (en) * | 2014-10-28 | 2016-12-07 | 中国核工业华兴建设有限公司 | Constant-voltage method detection nuclear power station gas-tight door bubble-tight detection device and detection method thereof |
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