System for testing a natural circulation valve by simulating a reactor environment

Abstract

The embodiment of the application relates to the test of a natural circulation valve, and particularly relates to a system for testing a natural circulation valve by simulating a reactor environment, which comprises a container, a differential pressure simulation piece, a pump, a jet pipeline and a bypass pipeline. The container has a mounting port, and a valve body of the natural circulation valve is mounted at the mounting port inside the container; the differential pressure simulation piece is used for simulating a differential pressure environment inside and outside the natural circulation valve in the reactor together with the container, is arranged outside the container, and is communicated with the valve body of the natural circulation valve through the mounting port; the pump is used for providing a flowing pressure for a test medium; the jet pipeline is used for providing a flow path of cooling water flowing to the natural circulation valve in the reactor; and the bypass pipeline is used for providing a flow path of cooling water flowing through a reactor core in the reactor. The system provided by the embodiment of the application can test the performance of the natural circulation valve under the simulated reactor environment, and is favorable for improving the accuracy of performance verification of the natural circulation valve.

Description

Technical Field

[0001] Embodiments of this application relate to the testing of natural circulation valves, specifically to a system for testing natural circulation valves by simulating a reactor environment. Background Technology

[0002] The statements herein are provided merely as background information in connection with this application and do not necessarily constitute prior art.

[0003] Under normal reactor operation, the natural circulation valve maintains reliable closure and sealing by relying on jet flow. In the event of reactor shutdown or accident, the natural circulation valve can open by its own mechanical structure, allowing residual heat from the reactor core to be discharged through natural circulation, thus ensuring reactor safety. Summary of the Invention

[0004] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0005] This application provides a system for testing a natural circulation valve by simulating a reactor environment. The system includes a container, a differential pressure simulation element, a pump, a jet pipeline, and a bypass pipeline. The container has an installation port, and the valve body of the natural circulation valve is installed inside the container at the installation port. The differential pressure simulation element includes a housing for containing the test medium. The housing, together with the container, simulates the differential pressure environment inside and outside the natural circulation valve within the reactor. The housing is located outside the container and communicates with the valve body of the natural circulation valve through the installation port. The pump provides the pressure for the flow of the test medium. The jet pipeline provides a simulated flow path for cooling water to flow to the natural circulation valve within the reactor. The jet pipeline is connected to the pump outlet and receives a portion of the test medium from the pump outlet, and provides a portion of the test medium to the valve cover of the natural circulation valve in the form of a jet. The bypass pipeline provides a simulated flow path for cooling water to flow through the reactor core within the reactor. The bypass pipeline is connected to the pump outlet and receives the remaining portion of the test medium from the pump outlet.

[0006] The system provided in the embodiments of this application simulates the pressure difference environment inside and outside the natural circulation valve in the reactor through the box and container. It provides cooling water flow paths to the natural circulation valve and the reactor core in the reactor through jet pipes and bypass pipes, respectively, thereby simulating the reactor environment. This allows for the testing of the performance of the natural circulation valve in the simulated reactor environment, which helps to improve the accuracy of the test results. Attached Figure Description

[0007] Other objects and advantages of this application will become apparent from the following description of embodiments of this application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of this application.

[0008] Figure 1 This is a schematic diagram of a system for testing a natural circulation valve, provided in an embodiment of this application.

[0009] Figure 2 This is a schematic diagram of the structure of the system provided in the embodiments of this application after the container and the box are connected.

[0010] Figure 3 This invention illustrates one flow pattern of the test medium in a system when testing a natural circulation valve with the valve cover located outside the valve body using the system provided by an embodiment of this application.

[0011] Figure 4 This invention illustrates an alternative flow pattern of the test medium in a system when testing a natural circulation valve with the valve cover located outside the valve body using the system provided by the embodiments of this application.

[0012] Figure 5 This illustrates another flow pattern of the test medium in the system when testing a natural circulation valve with the valve cover located outside the valve body using the system provided by the embodiments of this application.

[0013] Figure 6 This invention illustrates one flow pattern of the test medium in a system when testing a natural circulation valve with the valve cover located inside the valve body using the system provided by an embodiment of this application.

[0014] Figure 7 This invention illustrates an alternative flow pattern of the test medium in a system when testing a natural circulation valve with the valve cover located inside the valve body using the system provided by the embodiments of this application.

[0015] Explanation of reference numerals in the attached figures:

[0016] 100. System;

[0017] 10. Container; 101. Mounting port; 102. Jet mounting port; 103. Bypass inlet; 104. Fluid outlet; 105. Second overflow hole; 11. Differential pressure simulation element; 111. Housing; 112. Overflow chamber; 113. First overflow hole; 114. Heating element; 12. Pump; 13. Heating element; 141. First air supply interface; 1411. First pressure regulating pipeline; 142. Second air supply interface; 1421. Second pressure regulating pipeline; 143. Third pressure regulating pipeline; 15. Differential pressure measuring element; 151. Differential pressure measuring element interface; 16. First temperature measuring element; 161. First temperature measuring element interface; 17. Second temperature measuring element; 171. Second temperature measuring element interface; 18. First flow measuring element; 19. Second flow measuring element; 20. First switch; 21. First overflow line; 211. Overflow switch; 22. Measuring element; 221. Measuring cylinder; 222. Level gauge; 23. Angle detection element; 24. First line; 25. Second line; 251. Second switch; 26. Third line; 27. Fourth line; 271. Fourth switch; 28. Fifth line; 29. ​​Sixth line; 291. Sixth switch; 30. Seventh line; 31. Eighth line; 311. Eighth switch; 32. Ninth line; 33. Tenth line; 331. Tenth switch; 34. Eleventh line; 341. Eleventh switch; 35. Pressure measuring element; 351. Pressure measuring element interface; 36. Observation window; 37. Flange manhole; 38. Overflow return pump; 39. Support element; 40. Drain line; 401. Drain switch;

[0018] 200. Natural circulation valve; 201. Valve body; 202. Valve seat; 203. Valve cover; 204. Connecting parts.

[0019] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0020] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0021] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0022] The switching capability, sealing performance, and resistance characteristics of the natural circulation valve affect its normal operation and thus the safety of the reactor. Therefore, it is necessary to conduct tests on the performance of the natural circulation valve.

[0023] The relevant technologies lack performance testing for the working environment of natural circulation valves. The inventors of this application have discovered that when conducting performance tests on natural circulation valves installed on the core basket of a deep-water reactor, the influence of factors such as the pressure difference between the inside and outside of the valve needs to be considered in order to obtain more accurate test results.

[0024] Therefore, embodiments of this application provide a system for testing natural circulation valves by simulating a reactor environment.

[0025] like Figure 1 The diagram illustrates a schematic of a system 100 for testing a natural circulation valve 200 according to an embodiment of this application. The system 100 may include a container 10, a differential pressure simulation element 11, a pump 12, a jet pipeline, and a bypass pipeline. The container 10 has an installation port 101, and the valve body 201 of the natural circulation valve 200 is installed inside the container 10 at the installation port 101. The differential pressure simulation element 11 includes a housing 111 for containing the test medium. The housing 111, together with the container 10, simulates the differential pressure environment inside and outside the natural circulation valve 200 within the reactor. The housing 111 is located outside the container 10 and communicates with the valve body 201 of the natural circulation valve 200 through the installation port 101. The pump 12 provides the pressure for the flow of the test medium. The jet pipe provides a flow path for cooling water to flow through the natural circulation valve 200 within the simulated reactor core. The jet pipe is connected to the outlet of pump 12 to receive a portion of the test medium from the outlet of pump 12 and to supply a portion of the test medium in jet form to the valve cover 203 of the natural circulation valve 200. The bypass pipe provides a flow path for cooling water to flow through the reactor core within the simulated reactor core. The bypass pipe is connected to the outlet of pump 12 to receive the remaining test medium from the outlet of pump 12.

[0026] The system 100 provided in the embodiments of this application simulates the pressure difference environment inside and outside the natural circulation valve 200 in the reactor through the box 111 and the container 10. The system provides cooling water flow paths to the natural circulation valve 200 in the reactor and cooling water flow paths through the reactor core in the reactor through the jet pipe and the bypass pipe, respectively, thereby simulating the reactor environment. This allows for the testing of the performance of the natural circulation valve 200 in the simulated reactor environment, which helps to improve the accuracy of the test results.

[0027] In embodiments of this application, pump 12 can simulate the main pump of a reactor, thereby regulating jet flow rate and differential pressure changes through both jet piping and bypass piping. In some embodiments, pump 12 can change the pressure of the flow supplied to the test medium by changing its frequency.

[0028] In some embodiments, the test medium flowing out of the jet line flows to the natural circulation valve 200, and the test medium flowing out of the bypass line can return to the inlet of the pump 12 through the line.

[0029] In some embodiments, the system 100 can be used to conduct performance tests on the natural circulation valve 200, whose valve cover 203 is located outside the valve body 201. In such an embodiment, the jet line enters the container 10.

[0030] In other embodiments, the system 100 can be used to perform performance tests on the natural circulation valve 200, whose cover 203 is located inside the valve body 201. In such embodiments, the jet conduit is in fluid communication with the housing 111.

[0031] In some embodiments, the test medium may be deionized water.

[0032] In some embodiments, the system may include a return line for returning the test medium in container 10 and housing 111 to the inlet of pump 12, thereby circulating the test medium. The return line may include a first return line and a second return line. The first return line is used to return the test medium in container 10 to the inlet of pump 12. The second return line is used to return the test medium in housing 111 to the inlet of pump 12.

[0033] See Figure 1 In some embodiments, the container 10 may be cylindrical. In some embodiments, the box body 111 may be fixed to the outside of the container 10 by welding.

[0034] like Figure 2The diagram illustrates the structure of the system 100 provided in the embodiments of this application after the container 10 and the box 111 are connected. In some embodiments, the box 111 can be welded to the container 10. In some embodiments, the system 100 may also include a support member 39, one end of which is fixedly connected to the side wall of the container 10, and the other end is fixedly connected to the bottom of the box 111 to support the box 111 and ensure the stability of the box 111.

[0035] In some embodiments, the valve body 201 can be fixedly installed inside the container 10 via welding through the mounting port 101. See also Figure 1 and Figure 2 In some embodiments, the axis of the valve body 201 forms a certain angle with the inner wall of the container 10, for example, it can be 45°.

[0036] See Figure 1 In some embodiments, the natural circulation valve 200 may further include a connector 204, through which the valve cover 203 is connected to the valve body 201. In some embodiments, the connector 204 is a hinge, allowing the valve cover 203 to rotate relative to the valve body 201. A valve seat 202 is provided at the end of the valve body 201 facing the valve cover 203. During the rotation of the valve cover 203 relative to the valve body 201, the valve seat 202 can be opened or closed.

[0037] In some embodiments, the outlet of the jet conduit faces the side of the valve cover 203 that is opposite to the valve seat 202, so that the valve cover 203 can close the valve seat 202 under the action of the test medium flowing out of the jet conduit. Since the housing 111 is connected to the container 10 through the valve body 201, by allowing the test medium flowing out of the jet conduit to enter the container 10 or the housing 111, the system 100 of this embodiment can test two types of natural circulation valves 200 with the valve cover 203 located inside and outside the valve body 201.

[0038] See Figure 2 In some embodiments, the differential pressure simulation element 11 may further include a heating element 114 for heating the housing 111. See also Figure 1 For the natural circulation valve 200 with the valve cover 203 located outside the valve body 201, the chamber 111 is heated by the heating element 114 so that the temperature of the test medium inside the chamber 111 is higher than the temperature inside the container 10, which can simulate the working condition of the high temperature cooling medium temperature on the reactor core side.

[0039] In some embodiments, the system 100 further includes an auxiliary pipeline, through which the housing 111 and the container 10 are fluidly connected. When the pump 12 is de-energized to simulate the failure of the main pump in the reactor, the heating element 114 heats the housing 111 so that when the natural circulation valve 200 is opened, the high-temperature test medium inside the housing 111 can circulate between the housing 111, the natural circulation valve 200, the container 10, and the auxiliary pipeline to form a natural circulation flow path.

[0040] In other words, this auxiliary pipeline is used to assist in forming a natural circulation path. Specifically, when pump 12 is de-energized to simulate the failure of the main pump in the reactor, the flow rate in the jet pipeline decreases, and valve cover 203 automatically opens under the gravity of the counterweight. The heating element 114 heats the chamber 111, causing the temperature of the test medium inside the chamber 111 to gradually rise. When the temperature of the test medium reaches a certain level, the test medium inside the chamber 111 flows into the container 10 through valve body 201 and flows out of the container through fluid outlet 104. The outflowing test medium returns to the chamber 111 through the auxiliary pipeline, establishing a natural circulation path through the natural circulation valve 200. The auxiliary pipeline can be a separate pipeline or can be reused with other pipelines.

[0041] See Figure 1 In some embodiments, the system 100 may further include a first temperature measuring element 16 and a second temperature measuring element 17, which are used to measure the temperature of the test medium inside the container 10 and the box 111, respectively. The first temperature measuring element 16 and the second temperature measuring element 17 can measure the temperature of the test medium on both sides of the natural circulation valve 200, which facilitates the adjustment of the temperature of the test medium to achieve a simulated reactor environment.

[0042] In some embodiments, the first temperature measuring element 16 can enter the interior of the container 10 through the first temperature measuring element interface 161 provided on the top of the container 10, and the second temperature measuring element 17 can enter the interior of the box 111 through the second temperature measuring element interface 171 provided on the top of the box 111.

[0043] In some embodiments, see Figure 2 The container 10 may include a jet mounting port 102. In some embodiments, the jet conduit may include a first jet conduit. One end of the first jet conduit is in fluid communication with the outlet of the pump 12 via a conduit, and the other end of the first jet conduit enters the interior of the container 10 via the jet mounting port 102. In such an embodiment, the system can use the first jet conduit to test the natural circulation valve 200 with the valve cover 203 located outside the valve body 201.

[0044] When testing the natural circulation valve 200 with the valve cover 203 located outside the valve body 201, the first jet conduit can provide a force to the valve cover 203 to rotate it toward the valve seat 202. The force provided by the first jet conduit can push the valve cover 203 to rotate toward the valve seat 202, which is beneficial for conducting performance tests on the natural circulation valve 200 with the valve cover 203 located outside the valve body 201.

[0045] In some embodiments, the center of the first jet conduit and the center of the valve cover 203 are at the same horizontal level to ensure that the jet from the first jet conduit can provide sufficient force to the valve cover 203. In some embodiments, there is a certain distance between the first jet conduit and the valve cover 203 to avoid damage to the valve cover 203 due to excessive force provided by the jet from the first jet conduit.

[0046] See Figure 2 In some embodiments, container 10 further includes a bypass inlet 103. In some embodiments, the bypass pipeline includes a first bypass pipeline. One end of the first bypass pipeline is in fluid communication with the outlet of pump 12 via a pipe, and the other end of the first bypass pipeline is in communication with the bypass inlet 103 of container 10. The test medium flowing through the first bypass pipeline can simulate the flow path of cooling water through the reactor core, which is beneficial for conducting performance tests on the natural circulation valve 200. The test medium flowing out of the outlet of pump 12 can simultaneously enter the first bypass pipeline and the first jet pipeline, thereby simulating the environment in which the coolant flowing from the main pump in the reactor flows to the reactor core and the natural circulation valve respectively.

[0047] In some embodiments, the bypass inlet 103 may be located at the top of the container 10. The flow path of the test medium entering through the bypass inlet 103 is close to the flow path of the coolant flowing through the reactor core, so as to simulate the environment inside the reactor.

[0048] See Figure 2 In some embodiments, container 10 may further include a fluid outlet 104, through which the test medium inside container 10 flows out of container 10 and returns to the inlet of pump 12. Specifically, the test medium flowing out of container 10 from fluid outlet 104 can return to the inlet of pump 12 through a first return line. By providing fluid outlet 104 to return the test medium inside container 10 to pump 12, the circulation of coolant within a simulated reactor is achieved.

[0049] Since the first jet pipeline is fluidly connected to the outlet of pump 12, the test medium flowing out of the outlet of pump 12 will flow to the side of valve cover 203 facing away from valve seat 202. Therefore, the environment of the side of valve cover 203 facing away from valve seat 202 is a high-pressure environment. Since valve body 201 is fluidly connected to the inlet of pump 12 through housing 111, the fluid on the side of valve cover 203 facing valve seat 202 will enter valve body 201 and flow into housing 111, making the environment of the side of valve cover 203 facing valve seat 202 a low-pressure environment. That is, the low-pressure state on the core side can be simulated through housing 111.

[0050] In some embodiments, see Figure 1 and Figure 6 The jet conduit may further include a second jet conduit, one end of which is connected to the outlet of pump 12 via a conduit, and the other end of which is connected to housing 111. In such an embodiment, the system can use the second jet conduit to test the natural circulation valve 200 whose valve cover 203 is located inside valve body 201.

[0051] When testing the natural circulation valve 200 with the valve cover 203 located inside the valve body 201, the second jet conduit can provide a force to the valve cover 203 to rotate it toward the valve seat 202. The force provided by the second jet conduit can push the valve cover 203 to rotate toward the valve seat 202, which is beneficial for conducting performance tests on the natural circulation valve 200 with the valve cover 203 located inside the valve body 201.

[0052] In some embodiments, the bypass line may further include a second bypass line, one end of which is in fluid communication with the outlet of pump 12, and the other end of which is in fluid communication with the inlet of pump 12. The remaining test medium flowing out of the outlet of pump 12 can return to the inlet of pump 12 via the second bypass line without flowing through the second jet line.

[0053] Since the second jet pipeline is fluidly connected to the outlet of pump 12, the test medium flowing out of the outlet of pump 12 will flow to the side of valve cover 203 facing away from valve seat 202. Therefore, the environment on the side of valve cover 203 facing away from valve seat 202 is a high-pressure environment. By connecting the bypass inlet 103 and / or fluid outlet 104 to the inlet of pump 12, the fluid on the side of valve cover 203 facing valve seat 202 can flow out of container 10 through bypass inlet 103 and / or fluid outlet 104, so that the environment on the side of valve cover 203 facing valve seat 202 is a low-pressure environment. Therefore, the system 100 of this embodiment can simulate the high-pressure state on the core side through the box 111.

[0054] See Figure 1In some embodiments, system 100 may further include a heating element 13 for heating the test medium at the inlet of return pump 12. Heating the test medium ensures that its temperature at the inlet of return pump 12 is substantially the same as the temperature of the coolant within the reactor. The heating element 13 may be a heater.

[0055] In some embodiments, the system 100 may further include a pressure regulating component for regulating the pressure within the container 10 and the housing 111. Regulating the pressure within the container 10 and the housing 111 using the pressure regulating component stabilizes the pressure of the system 100.

[0056] In some embodiments, the pressure regulating assembly may include a first pressure regulating line 1411 for regulating the pressure inside the container 10. The first pressure regulating line 1411 is in fluid communication with the container 10 via a first gas supply port 141 located at the top of the container 10. Exemplarily, the first pressure regulating line 1411 can be used to pressurize or depressurize the container 10 to regulate the pressure inside the container 10.

[0057] In some embodiments, the pressure regulating assembly may further include a second pressure regulating line 1421 for regulating the pressure inside the housing 111. The second pressure regulating line 1421 is in fluid communication with the housing 111 via a second air supply port 142 located at the top of the housing 111. Exemplarily, the second pressure regulating line 1421 can be used to pressurize or depressurize the gas inside the housing 111 to regulate the pressure inside the housing 111.

[0058] See Figure 1 In some embodiments, the system 100 may also include a differential pressure measuring element 15, which is used to measure the pressure difference between the container 10 and the valve body 201, that is, to measure the pressure difference between the side of the valve cover 203 facing the valve seat 202 and the side of the valve cover 203 facing away from the valve seat 202.

[0059] See Figure 2 In some embodiments, the system 100 may include two differential pressure measuring interfaces 151, one of which is disposed on the container 10 and the other on the valve body 201, with both interfaces at the same horizontal level. The differential pressure measuring element 15 can achieve fluid communication with the container 10 and the valve seat 202 through the two interfaces 151 to measure the pressure difference within the container 10 and the valve body 201.

[0060] See Figure 1In some embodiments, system 100 may further include a flow measurement component and a flow regulation component. The flow measurement component is used to measure the flow rate of the jet line and the bypass line, and the flow regulation component is used to regulate the flow rate of the test medium entering the jet line and the bypass line. The reactor environment can be simulated by adjusting the flow rate of the test medium entering the jet line and the bypass line.

[0061] In some embodiments, the flow regulating component can be a switch, which can regulate the flow rate of the test medium entering the jet pipeline and the bypass pipeline by adjusting the opening degree of the switch.

[0062] In some embodiments, the flow measurement assembly includes a first flow measurement element 18 disposed on the jet pipeline. When the jet pipeline includes a first jet pipeline and a second jet pipeline, a first flow measurement element 18 is respectively disposed on the first jet pipeline and the second jet pipeline.

[0063] In some embodiments, the flow measurement assembly further includes a second flow measurement element 19, which may be disposed in the bypass pipeline to measure only the flow rate of the bypass pipeline; or it may be disposed at the outlet of the pump 12 to measure the total flow rate of the bypass pipeline and the jet pipeline.

[0064] See Figure 2 In some embodiments, the top of the housing 111 is provided with a first overflow hole 113.

[0065] In some embodiments, the system 100 may further include a first overflow line 21 and a measuring element 22. During a leakage test on the natural circulation valve 200 with the valve cover 203 located outside the valve body 201, the test medium leaking from the container 10 into the housing 111 enters the first overflow line 21 via the first overflow hole 113; the measuring element 22 is used to receive and measure the test medium from the first overflow line 21.

[0066] In some embodiments, the first overflow line 21 is provided with an overflow switch 211, and the leakage test medium is controlled to enter the measuring element 22 by adjusting the opening and closing of the overflow switch 211.

[0067] See Figure 2 In some embodiments, the differential pressure simulation element 11 may further include an overflow cavity 112 formed above the housing 111, the overflow cavity 112 being in fluid communication with the housing 111. In some embodiments, a first overflow hole 113 is in fluid communication with the side of the overflow cavity 112, and the test medium leaking from the container 10 into the housing 111 first enters the overflow cavity 112, and then enters the first overflow pipe 21 through the first overflow hole 113 which is in fluid communication with the overflow cavity 112.

[0068] See Figure 2In some embodiments, the second air supply port 142 is located at the top of the overflow chamber 112 to prevent a portion of the overflowed test medium from entering the second pressure regulating pipe 1421 and not all of it from entering the first overflow pipe 21 through the first overflow hole 113, which would result in a smaller total amount received in the measuring element 22. At the same time, it can also prevent the test medium from entering the first overflow pipe 21 when the overflow volume is not being tested, thus preventing a larger total amount received in the measuring element 22.

[0069] See Figure 2 In some embodiments, the container 10 has a second overflow hole 105 at its upper part. In some embodiments, the system 100 may also include a second overflow line (not shown in the figures). When a leakage test is performed on the natural circulation valve 200 with the valve cover 203 inside the valve body 201, the test medium leaking from the housing 111 into the container 10 enters the second overflow line via the second overflow hole 105. In some embodiments, the measuring element 22 is also used to receive and measure the test medium from the second overflow line. When a leakage test is performed on the natural circulation valve 200 with the valve cover 203 inside the valve body 201, the test medium leaking from the housing 111 is sent to the measuring element 22 for measurement via the second overflow line, and the amount of test medium leaking from the valve cover 203 of the natural circulation valve 200 can be obtained.

[0070] See Figure 1 In some embodiments, the measuring element 22 can be a measuring cylinder 221. A level gauge 222 can be provided on the measuring cylinder 221, which can be used to measure the change in liquid level in the measuring cylinder 221 to measure the leakage of the test medium.

[0071] See Figure 1 In some embodiments, the system 100 may further include a third pressure regulating line 143 for regulating the pressure within the measuring element 22. The third pressure regulating line 143 is in fluid communication with the measuring element 22 via a gas supply port located at the top of the measuring element 22. Exemplarily, the third pressure regulating line 143 can be used to pressurize or depressurize the gas within the measuring element 22 to regulate the pressure within the measuring element 22.

[0072] In some embodiments, the pressures of the container 10, the box 111, and the measuring element 22 can be adjusted respectively through the first pressure regulating pipe 1411, the second pressure regulating pipe 1421, and the third pressure regulating pipe 143, so that the three are under the same pressure environment, which is beneficial to the performance test.

[0073] See Figure 2In some embodiments, the system 100 may further include an angle detection element 23, which is used to detect the angle between the valve cover 203 and the valve seat 202 of the natural circulation valve 200. By detecting the angle between the valve cover 203 and the valve seat 202 of the natural circulation valve 200, it is determined whether the valve cover 203 closes the valve seat 202. In some embodiments, the angle detection element 23 may be disposed on the connector 204.

[0074] See Figure 1 In some embodiments, the system 100 may further include: a first pipe 24, a second pipe 25, a third pipe 26, a fourth pipe 27, and a fifth pipe 28. The first pipe 24 is equipped with a first switch 20, the second pipe 25 is equipped with a second switch 251 and a first flow meter 18, the third pipe 26 is equipped with a second flow meter 19, and the fourth pipe 27 is equipped with a fourth switch 271. One end of the first pipe 24 is in fluid communication with the outlet of the pump 12. The second pipe 25 and the third pipe 26 are connected in parallel to the first pipe 24 in fluid communication. The second pipe 25 extends into the container 10, and the fifth pipe 28 is connected to the third pipe 26 via the fourth pipe 27.

[0075] When testing the natural circulation valve 200 with the valve cover 203 located outside the valve body 201, the second pipeline 25 forms a first jet pipeline that can provide a force to the valve cover 203 to rotate it toward the valve seat 202; the third pipeline 26, the fourth pipeline 27 and the fifth pipeline 28 together form a first bypass pipeline for diverting the test medium from the first pipeline 24.

[0076] In some embodiments, the flow regulation component may include a first switch 20, a second switch 251, and a fourth switch 271.

[0077] See Figure 1 In some embodiments, the system 100 may further include: a sixth pipe 29, a seventh pipe 30, an eighth pipe 31, and a ninth pipe 32. The sixth pipe 29 is equipped with a sixth switch 291, the eighth pipe 31 is equipped with an eighth switch 311, the sixth pipe 29 is connected in parallel with the fourth pipe 27 and is in fluid communication with the third pipe 26, the seventh pipe 30 is connected to the housing 111, and the eighth pipe 31 is in fluid communication with the inlet end of the pump 12 through the ninth pipe 32.

[0078] When testing the natural circulation valve 200, where the valve cover 203 is located inside the valve body 201, the first pipe 24, the third pipe 26, and the sixth pipe 29 together form a general pipeline connected to the outlet of the pump 12, and the seventh pipe 30 and the eighth pipe 31 are connected in parallel to this general pipeline. The seventh pipe 30 forms a second jet pipeline capable of providing a force to the valve cover 203 to rotate it toward the valve seat 202; the eighth pipe 31 forms a second bypass pipeline for diverting the test medium that enters the third pipe 26 via the first pipe 24.

[0079] In some embodiments, the seventh conduit 30 is provided with a first flow measurement element 18. The flow regulation assembly may include a first switch 20, a sixth switch 291, and an eighth switch 311.

[0080] See Figure 1 In some embodiments, system 100 may further include a tenth line 33. The tenth line 33 is used to fluidly communicate container 10 with the ninth line 32 to allow test medium in container 10 to return to pump 12, and the tenth line 33 is provided with a tenth switch 331.

[0081] The tenth pipe 33 and the ninth pipe 32 can form a first return pipe, allowing the test medium in container 10 and the test medium in box 111 to return to the inlet of pump 12. The seventh pipe 30, the eighth pipe 31, and the ninth pipe 32 can form a second return pipe, allowing the test medium in box 111 to return to the inlet of pump 12.

[0082] The tenth pipe 33, the eighth pipe 31, and the seventh pipe 30 can form auxiliary pipes to enable fluid communication between the box 111 and the container 10.

[0083] In some embodiments, the system 100 may further include an eleventh line 34. One end of the eleventh line 34 is in fluid communication with the fifth line 28 and the other end is in fluid communication with the ninth line 32, for allowing the test medium in the container 10 to return to the pump 12 via the fifth line 28 and the eleventh line 34, and the eleventh line 34 is provided with an eleventh switch 341.

[0084] In some embodiments, when testing the natural circulation valve 200 with the valve cover 203 located outside the valve body 201, the test medium in the housing 111 can return to the inlet of the pump 12 via the seventh line 30, the eighth line 31, and the ninth line 32. The return of the test medium in the housing 111 to the pump 12 is similar to the flow of coolant in the reactor, which is beneficial for simulating the reactor environment.

[0085] In some embodiments, all switches on the pipelines in system 100 are switches capable of adjusting their opening degree.

[0086] See Figure 1 In some embodiments, the system 100 may further include an overflow return pump 38, the outlet of which is in fluid communication with the eighth pipeline 31, and the inlet of which is in fluid communication with the drain pipeline of the measuring cylinder 221. The leaked test medium entering the measuring cylinder 221 can be returned to the inlet of the pump 12 through the overflow return pump 38.

[0087] See Figure 2 In some embodiments, the system 100 may also include a flange manhole 37, which may be located on the side wall of the container 10, allowing test personnel to enter the interior of the container 10 to install and inspect the natural circulation valve 200.

[0088] See Figure 2 In some embodiments, the system 100 may also include an observation window 36, which may be disposed on the side wall of the container 10, allowing the test personnel to observe the status of the natural circulation valve 200 through the observation window 36.

[0089] In some embodiments, the observation window 36 and the flange manhole 37 are at different horizontal heights. For example, the observation window 36 may be at a higher horizontal height than the flange manhole 37.

[0090] In some embodiments, the observation window 36 and the flange manhole 37 are offset from each other at a certain angle in the circumferential direction of the container 10, for example, they can be offset from each other by 90°.

[0091] See Figure 1 In some embodiments, the system 100 may further include a pressure measuring element 35, which is in fluid communication with the inside of the container 10 through a pressure measuring element interface 351 located on the top of the container 10, so as to measure the pressure inside the container 10, so as to facilitate the first pressure regulating pipeline 1411 to regulate the pressure inside the container 10.

[0092] In some embodiments, the system 100 may further include two drain pipes 40, each equipped with a drain switch 401. One drain pipe 40 is in fluid communication with the ninth pipe 32 to discharge the test medium in the flow path at the end of the test; the other drain pipe 40 is in fluid communication with the drain pipe at the bottom of the measuring cylinder 221 to discharge the test medium in the measuring cylinder 221 at the end of the test.

[0093] In some embodiments, the system of this application embodiment can be used to conduct closing tests, opening tests, leakage tests, resistance tests, metal adhesion tests, and reliability tests on the natural circulation valve 200. Specifically, the closing test can obtain the critical jet and critical pressure difference of the natural circulation valve 200 when closed under reactor operating conditions; the opening test can obtain the critical jet and critical pressure difference of the natural circulation valve 200 when opened under reactor operating conditions; the leakage test can obtain the sealing performance of the natural circulation valve 200 under different operating conditions; the resistance test can obtain the resistance characteristics of the natural circulation valve 200 when opened; the metal adhesion test can verify the metal adhesion of the natural circulation valve 200 during long-term closure; and the reliability test can verify whether the natural circulation valve 200 can still operate normally and reliably after multiple opening and closing cycles within its limited lifespan.

[0094] See Figure 1 Before conducting the test, the test medium is filled into the first pipeline 24 to the eleventh pipeline 34, the container 10 and the box 111 of the system 100. Then, the pump 12 and the heating element 13 are started. The test medium in the system 100 is heated to the preset temperature by adjusting the opening degree of all the switches on the pipeline in the system 100. Then, the pressure of the container 10 is adjusted to the preset pressure through the first pressure regulating pipeline 1411.

[0095] After the test is completed, turn off the pump 12, the heating element 13 and all switches on the pipeline in the system 100. Then adjust the pressure in the system 100 through the first pressure regulating pipeline 1411, the second pressure regulating pipeline 1421 and the third pressure regulating pipeline 143. Then open the drain switch 401 on the drain pipeline 40 to drain the test medium in the system 100.

[0096] The following describes in detail the testing process of the natural circulation valve 200 with reference to the accompanying drawings.

[0097] like Figure 3 As shown, it illustrates one flow pattern of the test medium in the system 100 when testing a natural circulation valve 200 with the valve cover 203 located outside the valve body 201 using the system 100 provided in the embodiments of this application, wherein, Figure 3 The red arrows indicate the direction of the test medium flowing out of the outlet of pump 12, and the blue arrows indicate the direction of the test medium flowing back to the inlet of pump 12. Figure 3 The flow direction of the test medium shown can be used to perform closing tests, opening tests, metal adhesion tests, and reliability tests on the natural circulation valve 200 with the valve cover 203 located outside the valve body 201.

[0098] See Figure 3The process of conducting a closing test on the natural circulation valve 200, whose cover 203 is located outside the valve body 201, includes: adjusting the frequency of pump 12, the opening degree of the first switch 20, the opening degree of the second switch 251, and the opening degree of the fourth switch 271, so that the test medium flows from the outlet of pump 12 into the first pipeline 24, and then part of the test medium flows to the second pipeline 25 to provide a jet to the valve cover 203; at the same time, the other part of the test medium flows through the first pipeline 24, then through the third pipeline 26, the fourth pipeline 27, and the fifth pipeline 28, and enters the container 10. When the angle detection element 23 detects that the valve seat 202 is completely closed by the valve cover 203, the flow rate measured by the first flow measurement element 18 on the second pipeline 25 and the pressure difference measured by the pressure difference measurement element 15 are recorded to obtain the critical jet and critical pressure difference when the natural circulation valve 200 is closed.

[0099] See Figure 3 The process of conducting an opening test on the natural circulation valve 200, whose cover 203 is located outside the valve body 201, includes: closing the natural circulation valve 200; heating the chamber 111 by the heating element 114 on the chamber 111 to raise the temperature of the test medium inside the chamber 111; then, reducing the frequency of the pump 12 to simulate the accident conditions of reactor shutdown, establishing the natural circulation flow path of the natural circulation valve 200. During this process, the flow path of the test medium is the same as in the closing test. When the angle detection element 23 detects that the valve cover 203 is open, the flow rate measured by the flow meter on the second pipeline 25 and the pressure difference measured by the pressure difference measurement element 15 are recorded to obtain the critical jet and critical pressure difference when the natural circulation valve 200 is open.

[0100] See Figure 3 The process of conducting a metal adhesion test on the natural circulation valve 200, whose valve cover 203 is located outside the valve body 201, includes: closing the natural circulation valve 200, heating the chamber 111 through the heating element 114 on the chamber 111 to raise the temperature of the test medium inside the chamber 111; then, adjusting the opening degree of the first switch 20, the second switch 251, and the fourth switch 271 until the jet flow rate and the pressure difference between the container 10 and the valve body 201 reach preset values. During this process, the pressure of the system 100 is adjusted through the pressure regulating component; after a preset time, the frequency of the pump 12 is reduced to simulate the accident condition of reactor shutdown. When the angle detection element 23 detects that the valve cover 203 is open, the flow rate measured by the first flow measurement element 18 on the second pipeline 25 and the pressure difference measured by the pressure difference measurement element 15 are recorded to obtain the critical jet flow rate and critical pressure difference when the natural circulation valve 200 is opened after adhesion. The critical jet flow and critical pressure difference at the time of opening after bonding are compared with those obtained during the opening test to determine whether the critical jet flow and critical pressure difference have changed, thereby verifying whether the natural circulation valve 200 can open normally when closed for a long period of time. In some embodiments, the preset time can be 5 months.

[0101] See Figure 3 The process of conducting a reliability test on the natural circulation valve 200, which is located outside the valve body 201 and has a valve cover 203, includes: repeatedly closing and opening the natural circulation valve 200 a preset number of times, measuring the critical jet and critical pressure difference when the natural circulation valve 200 is closed, the critical jet and critical pressure difference when the natural circulation valve 200 is opened, and the leakage of the test medium, and comparing them with the critical jet and critical pressure difference when closed, the critical jet and critical pressure difference when opened, and the leakage of the test medium before the preset number of opening and closing cycles, in order to verify whether the natural circulation valve 200 can still work normally and reliably after multiple opening and closing cycles within its limited lifespan.

[0102] like Figure 4 As shown, this illustrates another flow pattern of the test medium in the system 100 when testing a natural circulation valve 200 with the valve cover 203 located outside the valve body 201 using the system 100 provided in the embodiments of this application, wherein... Figure 4 The red arrows indicate the direction of the test medium flowing out of the outlet of pump 12, the blue arrows indicate the direction of the test medium flowing back to the inlet of pump 12, and the purple arrows indicate the direction of the test medium leaking from container 10 to housing 111 via natural circulation valve 200. Figure 4 The flow direction of the test medium shown can be used to conduct a leakage test on the natural circulation valve 200 with the valve cover 203 located outside the valve body 201.

[0103] See Figure 4 The process of conducting a leakage test on the natural circulation valve 200, whose valve cover 203 is located outside the valve body 201, includes: closing the natural circulation valve 200; heating the chamber 111 by the heating element 114 on the chamber 111 to raise the temperature of the test medium inside the chamber 111; then adjusting the opening of the first switch 20, the second switch 251, and the fourth switch 271 until the jet flow rate and the pressure difference between the container 10 and the valve body 201 reach preset values. During this process, the pressure of the system 100 is adjusted by the pressure regulating component; then opening the overflow switch 211 to allow the test medium leaking from the container 10 to the chamber 111 to enter the first overflow pipe 21 through the first overflow hole 113; after a preset time of stable measurement, measuring the leakage amount of the test medium by the measuring element 22 to obtain the leakage amount of the test medium of the natural circulation valve 200 under this operating condition. In some embodiments, the preset time can be 5 minutes. In some embodiments, different operating conditions can be obtained by changing at least one of the following: jet size, pressure difference between container 10 and valve body 201, and temperature difference across the natural circulation valve 200. In some embodiments, leakage tests can be conducted on the natural circulation valve 200 under different operating conditions.

[0104] like Figure 5 The diagram illustrates another flow pattern of the test medium in a system used to test a natural circulation valve with its cover located outside the valve body, employing the system provided in the embodiments of this application. Wherein, Figure 5 The red arrows indicate the direction of the test medium flowing out of the outlet of pump 12, and the blue arrows indicate the direction of the test medium flowing back to the inlet of pump 12. Figure 5 The flow direction of the test medium shown can be used to conduct resistance tests on the natural circulation valve 200 with the valve cover 203 located outside the valve body 201.

[0105] See Figure 5 The process of conducting a resistance test on the natural circulation valve 200, which is located outside the valve body 201 and has the valve cover 203, includes: opening the pump 12, the first switch 20, the eleventh switch 341, the sixth switch 291, and the tenth switch 331, and closing the second switch 251, the fourth switch 271, and the eighth switch 311; then, adjusting the frequency of the pump 12 and the opening of the first switch 20 so that the jet provided by the housing 111 to the valve cover 203 reaches the set flow rate of natural circulation, recording the flow rate measured by the second flow measuring element 19 of the third pipeline 26 and the pressure difference measured by the pressure difference measuring element 15, and thus obtaining the resistance coefficient of the natural circulation valve 200.

[0106] The process of determining the resistance coefficient of the natural circulation valve 200 includes: determining the resistance coefficient of the natural circulation valve 200 based on the flow rate measured by the second flow meter 19 of the third pipeline 26 and the pressure difference measured by the pressure difference meter 15. The flow rate measured by the second flow meter 19 of the third pipeline 26, the pressure difference measured by the pressure difference meter 15, and the resistance coefficient satisfy the following relationship:

[0107]

[0108] Wherein, ΔP is the differential pressure measured by the differential pressure measuring device 15, Q is the flow rate measured by the second flow measuring device 19 of the third pipeline 26, ρ is the density of the test medium, D is the inner diameter of the valve body 201 of the natural circulation valve 200, and ξ is the resistance coefficient of the natural circulation valve 200.

[0109] like Figure 6 The diagram illustrates one flow pattern of the test medium in system 100 when testing a natural circulation valve 200 with the valve cover 203 located inside the valve body 201 using the system provided in the embodiments of this application. Figure 6 The red arrows indicate the direction of the test medium flowing out of the outlet of pump 12, and the blue arrows indicate the direction of the test medium flowing back to the inlet of pump 12. Figure 6The flow direction of the test medium shown can be used to perform closing tests, opening tests, resistance tests, metal adhesion tests, and reliability tests on the natural circulation valve 200 with the valve cover 203 located inside the valve body 201.

[0110] See Figure 6 The process of conducting a closing test on the natural circulation valve 200, whose cover 203 is located inside the valve body 201, includes: adjusting the frequency of pump 12, the opening degree of the first switch 20, the opening degree of the fourth switch 271, and the opening degree of the sixth switch 291, so that the test medium flows out from the outlet of pump 12, flows sequentially through the first pipeline 24, the third pipeline 26, the sixth pipeline 29, and the seventh pipeline 30, flows into the housing 111, and then flows from the housing 111 to the container 10, providing a jet to the valve cover 203. When the angle detection element 23 detects that the valve seat 202 is completely closed by the valve cover 203, the flow rate measured by the flow meter on the seventh pipeline 30 and the pressure difference measured by the pressure difference measurement element 15 are recorded to obtain the critical jet and critical pressure difference when the natural circulation valve 200 is closed.

[0111] See Figure 6 The process of conducting an opening test on the natural circulation valve 200, which is located inside the valve body 201 and has its cover 203, includes: adjusting the opening degree of the first switch 20 and the sixth switch 291 until the natural circulation valve 200 is closed; then, reducing the frequency of the pump 12 until the natural circulation valve 200 is opened. The flow rate measured by the flow meter on the seventh pipeline 30 and the differential pressure measured by the differential pressure measuring element 15 are recorded to obtain the critical jet and critical differential pressure when the natural circulation valve 200 is open.

[0112] See Figure 6 The process of conducting a resistance test on the natural circulation valve 200, which is located inside the valve body 201 and has a valve cover 203, includes: opening the first switch 20, the sixth switch 291, the eighth switch 311, and the tenth switch 331, and closing the second switch 251, the fourth switch 271, and the eleventh switch 341; then, adjusting the frequency of the pump 12 and the opening degree of the first switch so that the jet provided by the housing 111 to the valve cover 203 reaches the natural circulation set flow rate, recording the flow rate measured by the first flow measuring element 18 of the seventh pipeline 30 and the pressure difference measured by the pressure difference measuring element 15, and thus obtaining the resistance coefficient of the natural circulation valve 200.

[0113] See Figure 6The process of conducting a metal adhesion test on the natural circulation valve 200, whose valve cover 203 is located inside the valve body 201, includes: adjusting the opening degree of the first switch 20 and the sixth switch 291 until the jet flow rate and the pressure difference between the container 10 and the valve body 201 reach preset values. During this process, the pressure of the system 100 is adjusted through the pressure regulating component. After a preset time, the frequency of the pump 12 is reduced to simulate the accident conditions of reactor shutdown. When the angle detection element 23 detects that the valve cover 203 is open, the flow rate measured by the flow meter on the seventh pipeline 30 and the pressure difference measured by the pressure difference measuring element 15 are recorded to obtain the critical jet flow rate and critical pressure difference when the natural circulation valve 200 is opened after adhesion. The critical jet flow rate and critical pressure difference when opened after adhesion are compared with the critical jet flow rate and critical pressure difference obtained during the opening test to determine whether the critical jet flow rate and critical pressure difference have changed, thereby verifying whether the natural circulation valve 200 can open normally when closed for a long period of time. In some embodiments, the preset time can be 5 months.

[0114] See Figure 6 The process of conducting a reliability test on the natural circulation valve 200, which is located inside the valve body 201 and has a valve cover 203, includes: repeatedly closing and opening the natural circulation valve 200 a preset number of times, measuring the critical jet and critical pressure difference when the natural circulation valve 200 is closed, the critical jet and critical pressure difference when the natural circulation valve 200 is opened, and the leakage of the test medium, and comparing them with the critical jet and critical pressure difference when closed, the critical jet and critical pressure difference when opened, and the leakage of the test medium before the preset number of opening and closing cycles, in order to verify whether the natural circulation valve 200 can still work normally and reliably after multiple opening and closing cycles within its limited lifespan.

[0115] like Figure 7 As shown, this illustrates another flow pattern of the test medium in system 100 when testing a natural circulation valve 200 with the valve cover 203 located inside the valve body 201 using the system provided in the embodiments of this application. Wherein, Figure 7 The red arrows indicate the direction of the test medium flowing out of the outlet of pump 12, the blue arrows indicate the direction of the test medium flowing back to the inlet of pump 12, and the purple arrows indicate the direction of the test medium leaking from the housing 111 into the container 10 via the natural circulation valve 200. Figure 7 The flow direction of the test medium shown can be used to conduct a leakage test on the natural circulation valve 200 with the valve cover 203 located inside the valve body 201.

[0116] See Figure 7The process of conducting a leakage test on the natural circulation valve 200, whose valve cover 203 is located inside the valve body 201, includes: closing the natural circulation valve 200; heating the chamber 111 by the heating element 114 on the chamber 111 to raise the temperature of the test medium inside the chamber 111; then adjusting the opening of the first switch 20 and the sixth switch 291 until the jet flow rate and the pressure difference between the container 10 and the valve body 201 reach preset values. During this process, the pressure of the system 100 is adjusted by the pressure regulating component; then opening the overflow switch to allow the test medium leaking from the chamber 111 to the container 10 to enter the second overflow pipeline through the second overflow hole 105; after a preset time of stable measurement, measuring the leakage amount of the test medium by the measuring element 22 to obtain the leakage amount of the test medium of the natural circulation valve 200 under this operating condition. In some embodiments, the preset time can be 5 minutes. In some embodiments, different operating conditions can be obtained by changing at least one of the following: jet size, pressure difference between container 10 and valve body 201, and temperature difference across the natural circulation valve 200. In some embodiments, leakage tests can be conducted on the natural circulation valve 200 under different operating conditions.

[0117] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0118] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A system for testing a natural circulation valve by simulating a reactor environment, characterized in that, include: A container having an installation port, wherein the valve body of the natural circulation valve is installed inside the container at the installation port; A differential pressure simulation device includes a housing for containing a test medium. The housing is used together with the container to simulate the differential pressure environment inside and outside the natural circulation valve in the stack. The housing is located outside the container and is connected to the valve body of the natural circulation valve through the mounting port. Pumps are used to provide pressure for the flow of test media; A jet pipe is used to provide a flow path for cooling water to flow from the simulated reactor core to the natural circulation valve. The jet pipe is connected to the outlet of the pump and is used to receive a portion of the test medium from the outlet of the pump and to supply the portion of the test medium to the valve cover of the natural circulation valve in the form of a jet. as well as A bypass line is provided to simulate the flow path of cooling water through the reactor core within the reactor. The bypass line is connected to the outlet of the pump and is used to receive the remaining test medium from the outlet of the pump. The jet conduit includes: The second jet conduit has one end connected to the outlet fluid of the pump via a conduit, and the other end connected to the housing. When testing a natural circulation valve with the valve cover inside the valve body, the second jet conduit can provide a force to the valve cover to rotate it toward the valve seat.

2. The system according to claim 1, characterized in that, The container includes a jet mounting port, and the jet conduit includes: The first jet conduit has one end connected to the outlet of the pump via a conduit, and the other end enters the container through the jet installation port. When testing a natural circulation valve with the valve cover located outside the valve body, the first jet conduit can provide a force to the valve cover to rotate it toward the valve seat.

3. The system according to claim 2, characterized in that, The container also includes a bypass inlet, and the bypass piping includes: A first bypass pipeline, one end of which is connected to the outlet of the pump via a pipeline, and the other end of which is connected to the bypass inlet of the container.

4. The system according to claim 3, characterized in that, The bypass inlet is located at the top of the container.

5. The system according to claim 3, characterized in that, The container also includes a fluid outlet through which the test medium inside the container flows out of the container and back to the inlet of the pump.

6. The system according to claim 1, characterized in that, The bypass pipeline includes: A second bypass line is provided, with one end of the second bypass line in fluid communication with the outlet of the pump and the other end in fluid communication with the inlet of the pump.

7. The system according to claim 1, characterized in that, Also includes: A heating element is used to heat the test medium returning to the inlet of the pump.

8. The system according to claim 1, characterized in that, Also includes: A pressure regulating component is used to regulate the pressure inside the container and chamber.

9. The system according to claim 1, characterized in that, Also includes: A differential pressure measuring device is used to measure the pressure difference between the container and the valve body.

10. The system according to claim 1, characterized in that, The differential pressure simulation device also includes a heating element for heating the housing; The system also includes auxiliary pipelines, and the box body and the container are in fluid communication through the auxiliary pipelines; When the pump is de-energized to simulate the failure of the main pump in the reactor, the heating element heats the chamber so that when the natural circulation valve is opened, the test medium with a higher temperature inside the chamber can circulate between the chamber, the natural circulation valve, the container, and the auxiliary pipeline to form a natural circulation flow path.

11. The system according to claim 10, characterized in that, Also includes: The first and second temperature measuring elements are used to measure the temperature of the test medium inside the container and the chamber, respectively.

12. The system according to claim 1, characterized in that, Also includes: A flow measurement component for measuring the flow rate of the jet pipe and the bypass pipe; A flow regulating component is used to regulate the flow rate of the test medium entering the jet pipeline and the bypass pipeline.

13. The system according to claim 1, characterized in that, The top of the housing is provided with a first overflow hole, and the system also includes: a first overflow pipe and a measuring element. When conducting a leakage test on a natural circulation valve with the valve cover located outside the valve body, the test medium leaking from the container into the tank enters the first overflow pipe through the first overflow hole. The measuring device is used to receive the test medium from the first overflow pipe and to measure it.

14. The system according to claim 13, characterized in that, The container is provided with a second overflow hole at its upper part, and the system further includes: a second overflow pipe. During a leakage test on a natural circulation valve with the valve cover located inside the valve body, the test medium leaking from the housing into the container enters the second overflow pipe through the second overflow hole. The measuring device is also used to receive and measure the test medium from the second overflow pipe.

15. The system according to claim 1, characterized in that, Also includes: An angle detection element is used to detect the angle between the valve cover and the valve seat of the natural circulation valve.

16. The system according to claim 1, characterized in that, Also includes: First pipeline, second pipeline, third pipeline, fourth pipeline, and fifth pipeline; The first pipeline is equipped with a first switch; the second pipeline is equipped with a second switch and a flow measurement component; the third pipeline is equipped with a flow measurement component; and the fourth pipeline is equipped with a fourth switch. One end of the first pipeline is in fluid communication with the outlet of the pump, and the second pipeline and the third pipeline are in parallel in fluid communication with the first pipeline; The second pipeline extends into the container; The fifth pipeline is connected to the third pipeline through the fourth pipeline; In the case of testing a natural circulation valve with the valve cover located outside the valve body, the second pipeline forms a jet pipeline capable of providing a force to the valve cover to rotate it toward the valve seat; the third, fourth, and fifth pipelines together constitute the bypass pipeline for diverting the test medium from the first pipeline.

17. The system according to claim 16, characterized in that, Also includes: Sixth pipeline, seventh pipeline, eighth pipeline, and ninth pipeline; The sixth pipeline is equipped with a sixth switch, and the eighth pipeline is equipped with an eighth switch; The sixth pipeline is in parallel with the fourth pipeline and is in fluid communication with the third pipeline; The seventh pipeline is connected to the housing; The eighth pipeline is in fluid communication with the inlet end of the pump through the ninth pipeline; In the case of testing a natural circulation valve with the valve cover located inside the valve body, the seventh pipeline forms a jet pipeline capable of providing a force to the valve cover to rotate it toward the valve seat; the eighth pipeline forms a bypass pipeline for diverting the test medium that enters the third pipeline via the first pipeline.

18. The system according to claim 17, characterized in that, Also includes: A tenth line, which connects the container to the ninth line in fluid communication to allow the test medium within the container to return to the pump, is provided with a tenth switch; or The eleventh pipeline, one end of which is in fluid communication with the fifth pipeline and the other end of which is in fluid communication with the ninth pipeline, is used to allow the test medium in the container to return to the pump via the fifth pipeline and the eleventh pipeline. The eleventh pipeline is equipped with an eleventh switch.

19. The system according to claim 17, characterized in that, in, When testing a natural circulation valve with the valve cover located outside the valve body, the test medium inside the chamber can return to the pump inlet via the seventh pipeline, the eighth pipeline, and the ninth pipeline.

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