A test system and method for the thermal alternation performance of a control rod drive mechanism.

Abstract

This application provides a system and method for testing the alternating hot and cold performance of a control rod drive mechanism, relating to the technical field of reactor control rod drive mechanism testing devices. The system includes a deionized water tank, a plunger pump, an inlet-side pressure control assembly, a heater, a control rod drive mechanism test container, a cooler, and an outlet-side pressure control assembly, as well as pipelines connecting these components. The inlet and outlet-side pressure control assemblies include multiple plunger-type orifice plates with parallel regulating valves. By controlling the activation or deactivation of the regulating valves, the pressure within the loop is adjusted. The deionized water in the loop reaches different boiling points due to varying pressures, simulating the closed, high-temperature, and high-pressure environment of the control rod drive mechanism, enabling alternating temperature tests above 100°C. By controlling the activation or deactivation of the plunger-type orifice plates, the water pressure within the loop can be precisely adjusted, i.e., the water temperature can be accurately adjusted, offering advantages such as precise, rapid, and easy pressure regulation.

Description

Technical Field

[0001] This application relates to the technical field of reactor control rod drive mechanism test device, specifically to a test system and method for the cold and hot alternation performance of a control rod drive mechanism. Background Technology

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

[0003] The control rod drive mechanism is a vertically stepping magnetic lifting device. Its main function is to insert and extract control rod assemblies in the reactor core at a specific speed, introduce negative reactivity into the reactor core, and realize power regulation, temperature regulation, emergency shutdown, etc.

[0004] Nuclear submarine reactors are confined to a sealed space, and the control rod drive mechanism at the top of the reactor is subject to slight deformation due to the high temperature and humidity of the surrounding environment during actual operation. This introduces additional resistance to the raising and lowering of the control rods, potentially posing a safety hazard to reactor control. Therefore, it is necessary to conduct thermal cycling performance tests on the control rod drive mechanism to ensure its reliability in actual operation.

[0005] The inventors discovered that because the control rod drive mechanism is located in a confined space with high pressure and drastic pressure changes, it is constantly subjected to alternating temperatures above 100°C. Conventional thermal alternation performance testing equipment, such as Chinese invention patent CN112082894A - a valve thermal alternation test device, tests the performance of the component under thermal alternation by passing hot or cold water through the test device to create temperature alternation. However, conventional testing equipment cannot simulate the high temperature and high pressure environment in a reactor, nor can it perform alternating temperature tests above 100°C, and therefore cannot be used for thermal alternation performance testing of the control rod drive mechanism. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this application provides a test system and method for the thermal alternation performance of a control rod drive mechanism, which can accurately simulate the high-temperature and high-pressure environment in a reactor and achieve thermal alternation at high operating temperatures, thereby meeting the needs of testing the rapid thermal alternation performance of the control rod drive mechanism.

[0007] To achieve the above objectives, the first objective of this disclosure is to provide a system for testing the alternating hot and cold performance of a control rod drive mechanism, employing the following technical solution:

[0008] A test system for the thermal alternation performance of a control rod drive mechanism includes a deionized water tank, a plunger pump, an inlet-side pressure control component, a heater, a test container for the control rod drive mechanism, a cooler, and an outlet-side pressure control component, as well as pipelines connecting the various components. The deionized water tank is connected to the inlet of the inlet-side pressure control component via the plunger pump. The inlet-side pressure control component is connected to the test container for the control rod drive mechanism via the heater. The test container for the control rod drive mechanism is connected to the outlet-side pressure control component via the cooler. The outlet-side pressure control component is connected to the deionized water tank.

[0009] The inlet-side pressure control assembly includes multiple plunger-type orifice plates connected in series.

[0010] The outlet pressure control assembly includes multiple plunger-type orifice plates connected in series.

[0011] Furthermore, the inlet-side pressure control assembly also includes a regulating valve connected in parallel with the plunger-type orifice plate; multiple regulating valves are provided, and each of the multiple regulating valves corresponds to one of the multiple plunger-type orifice plates.

[0012] The outlet pressure control assembly also includes a regulating valve connected in parallel with the plunger orifice plate; there are multiple regulating valves, and each regulating valve corresponds to one of the multiple plunger orifice plates.

[0013] Furthermore, a branch is provided between the plunger pump and the inlet-side pressure control assembly; the branch includes a branch plunger orifice plate and a branch regulating valve; the plunger pump is connected to the inlet of the branch plunger orifice plate; the branch plunger orifice plate is connected to the deionized water tank via the branch regulating valve.

[0014] Furthermore, a first valve is provided on the pipeline between the deionized water tank and the plunger pump; a second valve is provided at the outlet of the plunger pump; a third valve is provided at the inlet of the water inlet pressure control component; a fourth valve is provided at the inlet of the heater; and a fifth valve is provided at the outlet of the cooler.

[0015] Furthermore, a first temperature measuring device is provided at the inlet of the plunger pump; a second temperature measuring device is provided at the outlet of the heater; a third temperature measuring device is provided at the outlet of the test body of the control rod drive mechanism; and a fourth temperature measuring device is provided at the outlet of the cooler.

[0016] Furthermore, a first pressure measuring device is provided at the outlet of the plunger pump; a second pressure measuring device is provided at the inlet of the heater; a third pressure measuring device is provided at the outlet of the heater; a fourth pressure measuring device is provided at the inlet of the cooler; a fifth pressure measuring device is provided at the outlet of the cooler; and a sixth pressure measuring device is provided at the outlet of the water-side pressure control component.

[0017] Furthermore, the cooler includes an air-cooled tower; the air-cooled tower is connected to the cooler via a circulating pump; a fifth temperature measuring device is installed at the inlet of the air-cooled tower, and a sixth temperature measuring device is installed at the outlet of the air-cooled tower.

[0018] Furthermore, all temperature measuring devices employ armored K-type thermocouples.

[0019] Furthermore, the heater automatically controls its power based on the temperature measured by the second temperature measuring device.

[0020] The second objective of this disclosure is to provide a method for testing the thermal alternating performance of a control rod drive mechanism, utilizing the thermal alternating performance testing system for the control rod drive mechanism, and employing the following technical solution:

[0021] A method for testing the thermal alternation performance of a control rod drive mechanism, comprising the following steps:

[0022] 1. Open all valves in the system and start the plunger pump to allow deionized water to flow into the circuit;

[0023] 2. Close all regulating valves of the inlet pressure control assembly, and keep all regulating valves of the outlet pressure control assembly open; put all plunger orifice plates of the inlet pressure control assembly into use to build up pressure on the heater, control rod drive mechanism test vessel and cooler; turn on the heater to heat the deionized water in the circuit.

[0024] 3. Open the regulating valves of the inlet pressure control components one by one, so that the plunger orifice plates of the inlet pressure control components are disabled one by one; for each time the regulating valve of an inlet pressure control component is opened, the regulating valve of another inlet pressure control component is closed at the same time, so that the plunger orifice plates of the outlet pressure control components are activated one by one; and each time a plunger orifice plate is disabled and a plunger orifice plate is activated, the heater power is increased simultaneously, so that the temperature of the deionized water in the circuit rises in a stepwise manner, thus completing the heating and pressurization of the test container of the control rod drive mechanism.

[0025] 4. After the heating and pressurization are completed, execute the reverse process of step 3. Close the regulating valves of the inlet water pressure control components one by one, so that the plunger orifice plates of the inlet water pressure control components are activated one by one. When the regulating valve of one inlet water pressure control component is closed, the regulating valve of another inlet water pressure control component is opened at the same time, so that the plunger orifice plates of the outlet water pressure control components are deactivated one by one. And each time a plunger orifice plate is deactivated and a plunger orifice plate is activated, the heater power is reduced and the cooler power is increased at the same time, so that the temperature of the deionized water in the loop drops in a stepwise manner, thus completing the cooling and depressurization of the test container of the control rod drive mechanism.

[0026] 5. Repeat steps 3 and 4 to complete the cold and hot alternating performance test of the control rod drive mechanism.

[0027] Beneficial effects of the invention

[0028] 1. This application utilizes a plunger-type orifice plate for pressure regulation, causing the deionized water in the loop to reach different boiling points due to different pressures. This is very similar to the closed, high-temperature, and high-pressure environment of the control rod drive mechanism, realizing a reactor environment that cannot be simulated by conventional testing equipment.

[0029] 2. Compared with conventional devices that achieve alternating hot and cold temperatures by inputting hot and cold water into the circuit, this application uses pressure to control the boiling point of water in the circuit, achieving temperatures far exceeding those of conventional devices, enabling alternating temperature tests above 100°C, and realizing the alternating hot and cold performance test of the control rod drive mechanism.

[0030] 3. This application can accurately adjust the water pressure in the circuit by controlling the activation or deactivation of the plunger-type orifice plate, which means it can accurately adjust the water temperature. It has the advantages of precise, fast and easy pressure regulation. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0032] Figure 1 This is a schematic diagram of the control rod drive mechanism cold and hot alternation performance test system of Embodiment 1 of this application;

[0033] The components include: 1. Deionized water tank; 2. Plunger pump; 3. Inlet pressure control assembly; 4. Heater; 5. Control rod drive mechanism test container; 6. Cooler; 7. Outlet pressure control assembly; 8. Air-cooled tower; 9. Circulating pump; 10. Branch plunger orifice plate; 11. Branch regulating valve; 12. First valve; 13. Second valve; 14. Third valve; 15. Fourth valve; 16. Fifth valve; 17. Loop regulating valve; 18. First temperature measuring device; 19. Second temperature measuring device; 20. Third temperature measuring device; 21. Fourth temperature measuring device; 22. Fifth temperature measuring device; 23. Sixth temperature measuring device; 24. First pressure measuring device; 25. Second pressure measuring device; 26. Third pressure measuring device; 27. Fourth pressure measuring device; 28. Fifth pressure measuring device. 29. Sixth pressure measuring device; 30. Plunger orifice plate A; 31. Plunger orifice plate B; 32. Plunger orifice plate C; 33. Plunger orifice plate D; 35. Plunger orifice plate E; 36. Plunger orifice plate F; 37. Venturi flow meter. Detailed Implementation

[0034] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be described in detail below with reference to specific embodiments.

[0037] As described in the background section, conventional hot and cold alternating performance testing devices cannot simulate the high temperature and high pressure environment in a reactor, nor can they perform alternating temperature tests above 100°C. This application proposes a hot and cold alternating performance testing system and method for a control rod drive mechanism.

[0038] Example 1

[0039] One typical implementation of this application is as follows: Figure 1 As shown, a test system for the thermal alternation performance of a control rod drive mechanism is provided.

[0040] refer to Figure 1 This embodiment proposes a test system for the thermal alternation performance of a control rod drive mechanism, including a deionized water tank 1, a plunger pump 2, an inlet-side pressure control component 3, a heater 4, a test container for the control rod drive mechanism 5, a cooler 6, and an outlet-side pressure control component 7, as well as pipelines connecting each component; the deionized water tank is connected to the inlet of the inlet-side pressure control component via the plunger pump; the inlet-side pressure control component is connected to the test container for the control rod drive mechanism via the heater; the test container for the control rod drive mechanism is connected to the outlet-side pressure control component via the cooler; the outlet-side pressure control component is connected to the deionized water tank;

[0041] The inlet-side pressure control assembly includes multiple plunger-type orifice plates connected in series.

[0042] The outlet pressure control assembly includes multiple plunger-type orifice plates connected in series.

[0043] Specifically, the cooler includes an air-cooled tower 8; the air-cooled tower is connected to the cooler via a circulating pump 9, and dissipates heat to the outside through the air-cooled tower to reduce the water temperature in the circuit.

[0044] A branch circuit is also provided between the plunger pump and the inlet-side pressure control assembly; the branch circuit includes a branch plunger orifice plate 10 and a branch regulating valve 11; the plunger pump is connected to the inlet of the branch plunger orifice plate; the branch plunger orifice plate is connected to the deionized water tank via the branch regulating valve; the performance parameters of the branch plunger orifice plate are: pressure drop of 13MPa at a deionized water flow rate of 100kg / h.

[0045] Furthermore, a first valve 12 is provided on the pipeline between the deionized water tank and the plunger pump; a second valve 13 is provided at the outlet of the plunger pump; a third valve 14 is provided at the inlet of the inlet pressure control component; a fourth valve 15 is provided at the inlet of the heater; a fifth valve 16 is provided at the outlet of the cooler; and a loop regulating valve 17 is provided at the outlet of the outlet pressure control component.

[0046] It is understandable that by controlling the opening of the control loop regulating valve and the branch regulating valve, a small amount of pressure can be precisely applied to the entire loop in order to achieve the target pressure within the loop.

[0047] A first temperature measuring device 18 is installed at the inlet of the plunger pump; a second temperature measuring device 19 is installed at the outlet of the heater; a third temperature measuring device 20 is installed at the outlet of the test body of the control rod drive mechanism; a fourth temperature measuring device 21 is installed at the outlet of the cooler; a fifth temperature measuring device 22 is installed at the inlet of the air-cooled tower; and a sixth temperature measuring device 23 is installed at the outlet of the air-cooled tower; all temperature measuring devices are armored K-type thermocouples.

[0048] A first pressure measuring device 24 is installed at the outlet of the plunger pump; a second pressure measuring device 25 is installed at the inlet of the heater; a third pressure measuring device 26 is installed at the outlet of the heater; a fourth pressure measuring device 27 is installed at the inlet of the cooler; a fifth pressure measuring device 28 is installed at the outlet of the cooler; and a sixth pressure measuring device 29 is installed at the outlet of the water-side pressure control component; all pressure measuring devices are pressure gauges with 4-20mA remote transmission signals.

[0049] By observing the reading of the second pressure measuring device, the pressure between the heater, the test container of the control rod drive mechanism, and the cooler can be obtained, that is, the pressure on the test container of the control rod drive mechanism; while the water temperature inside the test container of the control rod drive mechanism can be obtained through the third temperature measuring device.

[0050] In this embodiment, the deionized water tank, plunger pump, inlet-side pressure control component, heater, control rod drive mechanism test container, cooler, and outlet-side pressure control component constitute an open loop. Considering the operating environment of the control rod drive mechanism, the target pressure control range of the open loop in this embodiment is 0.1-15.5 MPa, and the target maximum operating temperature of the loop is 350°C.

[0051] Specifically, the inlet-side pressure control assembly includes plunger-type orifice plate A30, plunger-type orifice plate B31, and plunger-type orifice plate C32; the outlet-side pressure control assembly includes plunger-type orifice plate D33, plunger-type orifice plate E34, and plunger-type orifice plate F35; the performance parameters of plunger-type orifice plates A to F are: pressure drop of 4.5 MPa at a deionized water flow rate of 100 kg / h;

[0052] Furthermore, to achieve the target pressure control range of 0.1-15.5 MPa, the outlet pressure control component also includes a plunger-type orifice plate G36; the performance parameters of the plunger-type orifice plate G are: pressure drop of 1.5 MPa under a deionized water flow rate of 100 kg / h.

[0053] To enable or disable the plunger orifice plates, each of the plunger orifice plates A to G is connected in parallel with a regulating valve; specifically, each of the plunger orifice plates A to G corresponds one-to-one with a regulating valve A to G.

[0054] Furthermore, in order to detect the flow rate of deionized water in the loop, this embodiment also provides a Venturi flow meter 37, which is installed between the loop branch and the third valve.

[0055] Understandably, when all regulating valves of the inlet-side pressure control assembly are closed and all regulating valves of the outlet-side pressure control assembly are open, all plunger orifice plates A to C are activated, and all plunger orifice plates D to G are deactivated. At this time, there is no obstruction to the liquid exchange between the control rod drive mechanism test container and the deionized water tank, that is, there is no pressure on the heater, the control rod drive mechanism test container and the cooler, and the reading of the second pressure measuring device is 0.

[0056] When plunger orifice plates A to C gradually fail and plunger orifice plates D to G gradually become active, the liquid exchange between the control rod drive mechanism test container and the deionized water tank is hindered by the plunger orifice plates, thereby establishing pressure in the heater, control rod drive mechanism test container and cooler.

[0057] As the pressure increases, the boiling point of deionized water between the heater, the test container of the control rod drive mechanism, and the cooler also increases. The water temperature is increased as the pressure rises by increasing the heater power. When all the plunger orifice plates D to G are activated and in conjunction with the loop regulating valve and the branch regulating valve, the target pressure of 15.5 MPa can be reached. At this time, the temperature at the test container of the control rod drive mechanism reaches 350℃, realizing the simulation of the high temperature and high pressure environment of the control rod drive mechanism.

[0058] Conversely, by gradually activating the plunger orifice plates A to C while gradually deactivating the plunger orifice plates D to G, the pressure on the heater, the test container of the control rod drive mechanism, and the cooler can be reduced, thereby lowering the boiling point of deionized water. Combined with the cooling of the circuit by the cooler, the temperature of the deionized water can be brought back to a low temperature, thus enabling the application of alternating hot and cold temperatures to the control rod drive mechanism and completing the alternating hot and cold performance test.

[0059] Example 2

[0060] Another typical embodiment of this application provides a method for testing the alternating hot and cold performance of a control rod drive mechanism.

[0061] This embodiment proposes a method for testing the thermal alternating performance of a control rod drive mechanism. The method utilizes the aforementioned thermal alternating performance testing system for the control rod drive mechanism and includes the following steps:

[0062] 1. Open all valves in the system and start the plunger pump to allow deionized water to flow into the circuit;

[0063] 2. Close all regulating valves of the inlet-side pressure control assembly, while keeping all regulating valves of the outlet-side pressure control assembly open; put all plunger orifice plates of the inlet-side pressure control assembly into operation to build pressure on the heater, control rod drive mechanism test vessel, and cooler; turn on the heater to heat the deionized water in the circuit; at this time, a pressure of 13.5 MPa is established between the main plunger pump and plunger orifice plate C and between the plunger pump and the branch plunger orifice plate. The first pressure measuring device displays 13.5 MPa. Simultaneously, the flow rate of the main line is 100 kg / h, and the flow rate of the branch line is 400 kg / h.

[0064] 3. Open the regulating valves of the inlet pressure control components one by one, so that the plunger orifice plates of the inlet pressure control components are disabled one by one; for each time the regulating valve of an inlet pressure control component is opened, the regulating valve of another inlet pressure control component is closed at the same time, so that the plunger orifice plates of the outlet pressure control components are activated one by one; and each time a plunger orifice plate is disabled and a plunger orifice plate is activated, the heater power is increased simultaneously, so that the temperature of the deionized water in the circuit rises in a stepwise manner, thus completing the heating and pressurization of the test container of the control rod drive mechanism.

[0065] Specifically, the heating and pressurization process includes: opening regulating valve A to disengage the plunger orifice plate A, and simultaneously closing regulating valve D to engage the plunger orifice plate D. At this time, a pressure of 4.5 MPa is established on the heater, control rod drive mechanism, test vessel, and cooler, and the second pressure measuring device displays 4.5 MPa;

[0066] When the heater power is applied, the temperature of the test container of the control rod drive mechanism rises rapidly to 150°C. The third temperature measuring device shows 150°C, while the second temperature measuring device shows a temperature of less than 160°C.

[0067] Opening regulating valve B disengages the plunger orifice plate B, while simultaneously closing regulating valve E engages the plunger orifice plate E. At this point, a pressure of 9 MPa is established in the heater, control rod drive mechanism, test vessel, and cooler, and the second pressure measuring device displays 9 MPa.

[0068] Increasing the heater power causes the temperature of the test container of the control rod drive mechanism to rise rapidly to 200℃. The third temperature measuring device shows 200℃, while the second temperature measuring device shows a temperature of less than 210℃.

[0069] Opening regulating valve C disengages the plunger orifice plate C from use, while simultaneously closing regulating valve F engages the plunger orifice plate F. At this point, a pressure of 13.5 MPa is established in the heater, control rod drive mechanism, test vessel, and cooler, and the second pressure measuring device displays 13.5 MPa.

[0070] Closing the regulating valve F puts the plunger-type orifice plate F into operation. At this time, a pressure of 15 MPa is established on the heater, control rod drive mechanism, test vessel, and cooler, and the second pressure measuring device displays 15 MPa.

[0071] Furthermore, by reducing the opening of the loop regulating valve and the branch regulating valve, the system pressure was finely adjusted to 15.5 MPa, and the second pressure measuring device showed 15.5 MPa;

[0072] Increasing the heater power caused the temperature of the test container of the control rod drive mechanism to rise rapidly to 200℃. The third temperature measuring device showed 343℃, while the second temperature measuring device showed a temperature less than 350℃.

[0073] 4. After the heating and pressurization are completed, execute the reverse process of step 3. Close the regulating valves of the inlet water pressure control components one by one, so that the plunger orifice plates of the inlet water pressure control components are activated one by one. When the regulating valve of one inlet water pressure control component is closed, the regulating valve of another inlet water pressure control component is opened at the same time, so that the plunger orifice plates of the outlet water pressure control components are deactivated one by one. And each time a plunger orifice plate is deactivated and a plunger orifice plate is activated, the heater power is reduced and the cooler power is increased at the same time, so that the temperature of the deionized water in the loop drops in a stepwise manner, thus completing the cooling and depressurization of the test container of the control rod drive mechanism.

[0074] 5. Repeat steps 3 and 4 to complete the cold and hot alternating performance test of the control rod drive mechanism.

[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for testing the alternating hot and cold performance of a control rod drive mechanism, characterized in that, This is achieved through a thermal cycling performance testing system, which includes a deionized water tank, a plunger pump, an inlet-side pressure control component, a heater, a control rod drive mechanism test container, a cooler, and an outlet-side pressure control component, as well as pipelines connecting each component. The deionized water tank is connected to the inlet of the inlet-side pressure control component via the plunger pump. The inlet-side pressure control component is connected to the control rod drive mechanism test container via the heater. The control rod drive mechanism test container is connected to the outlet-side pressure control component via the cooler. The outlet-side pressure control component is connected to the deionized water tank. The inlet-side pressure control assembly includes multiple plunger-type orifice plates connected in series. The outlet pressure control assembly includes multiple plunger-type orifice plates connected in series. The test method includes the following steps: 1) Open all valves in the system and start the plunger pump to allow deionized water to flow into the circuit; 2) Close all regulating valves of the inlet pressure control assembly, and keep all regulating valves of the outlet pressure control assembly open; put all plunger orifice plates of the inlet pressure control assembly into use to build up pressure on the heater, control rod drive mechanism test vessel and cooler; turn on the heater to heat the deionized water in the circuit. 3) Open the regulating valves of the inlet pressure control components one by one, so that the plunger orifice plates of the inlet pressure control components are disabled one by one; for each time the regulating valve of the inlet pressure control components is opened, the regulating valve of the inlet pressure control components is closed at the same time, so that the plunger orifice plates of the outlet pressure control components are activated one by one; and each time a plunger orifice plate is disabled and a plunger orifice plate is activated, the heater power is increased simultaneously, so that the temperature of the deionized water in the circuit rises in a stepwise manner, thus completing the temperature and pressure increase of the test container of the control rod drive mechanism. 4) After the heating and pressurization are completed, the process is reversed from step 3. The regulating valves of the inlet pressure control components are closed one by one, so that the plunger orifice plates of the inlet pressure control components are activated one by one. Each time the regulating valve of an inlet pressure control component is closed, the regulating valve of an inlet pressure control component is opened at the same time, so that the plunger orifice plates of the outlet pressure control components are deactivated one by one. And each time a plunger orifice plate is deactivated and a plunger orifice plate is activated, the heater power is reduced and the cooler power is increased at the same time, so that the temperature of the deionized water in the loop drops in a stepwise manner, thus completing the cooling and depressurization of the test container of the control rod drive mechanism. 5) Repeat steps 3 and 4 to complete the cold and hot alternation performance test of the control rod drive mechanism.

2. The method for testing the alternating hot and cold performance of a control rod drive mechanism as described in claim 1, characterized in that, The inlet-side pressure control assembly also includes a regulating valve connected in parallel with the plunger orifice plate; there are multiple regulating valves, and each regulating valve corresponds to one of the multiple plunger orifice plates. The outlet pressure control assembly also includes a regulating valve connected in parallel with the plunger orifice plate; there are multiple regulating valves, and each regulating valve corresponds to one of the multiple plunger orifice plates.

3. The method for testing the thermal alternation performance of a control rod drive mechanism as described in claim 2, characterized in that, A branch is provided between the plunger pump and the inlet-side pressure control assembly; the branch includes a branch plunger orifice plate and a branch regulating valve; the plunger pump is connected to the inlet of the branch plunger orifice plate; the branch plunger orifice plate is connected to the deionized water tank via the branch regulating valve.

4. The method for testing the alternating hot and cold performance of a control rod drive mechanism as described in claim 1, characterized in that, A first valve is installed on the pipeline between the deionized water tank and the plunger pump; a second valve is installed at the outlet of the plunger pump; a third valve is installed at the inlet of the water inlet pressure control component; a fourth valve is installed at the inlet of the heater; and a fifth valve is installed at the outlet of the cooler.

5. The method for testing the alternating hot and cold performance of a control rod drive mechanism as described in claim 1, characterized in that, A first temperature measuring device is installed at the inlet of the plunger pump; a second temperature measuring device is installed at the outlet of the heater; a third temperature measuring device is installed at the outlet of the test body of the control rod drive mechanism; and a fourth temperature measuring device is installed at the outlet of the cooler.

6. The method for testing the alternating hot and cold performance of a control rod drive mechanism as described in claim 1, characterized in that, A first pressure measuring device is installed at the outlet of the plunger pump; a second pressure measuring device is installed at the inlet of the heater; a third pressure measuring device is installed at the outlet of the heater; a fourth pressure measuring device is installed at the inlet of the cooler; a fifth pressure measuring device is installed at the outlet of the cooler; and a sixth pressure measuring device is installed at the outlet of the water-side pressure control component.

7. The method for testing the alternating hot and cold performance of a control rod drive mechanism as described in claim 1, characterized in that, The cooler includes an air-cooled tower; the air-cooled tower is connected to the cooler via a circulating pump; a fifth temperature measuring device is installed at the inlet of the air-cooled tower, and a sixth temperature measuring device is installed at the outlet of the air-cooled tower.

8. The method for testing the alternating hot and cold performance of a control rod drive mechanism as described in claim 5, characterized in that, All temperature measuring devices use armored K-type thermocouples.

9. The method for testing the alternating hot and cold performance of a control rod drive mechanism as described in claim 5, characterized in that, The heater automatically controls its power based on the temperature measured by the second temperature measuring device.

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