Re-submerging device and method for irradiation cladding tube
By designing an irradiation cladding tube reflooding device, the reflooding process of zirconium alloy cladding tubes under loss-of-water accident conditions was simulated, solving the problem of difficulty in studying its high-temperature oxidation behavior in existing technologies, improving reactor safety and reducing radioactive damage.
Patent Information
- Application Number
- CN202511098048.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-06
- Publication Date
- 2025-12-16
AI Technical Summary
Existing technologies cannot effectively simulate the reflooding process of zirconium alloy cladding tubes under loss-of-water accident conditions, which affects the study of their high-temperature oxidation behavior and thus the safety of the reactor.
Design a reflooding device for irradiated cladding tubes, including a heating furnace and a quenching water tank. Use a robotic arm to place test samples, and simulate the reflooding process through heating, heat preservation, pressurization and rapid water filling. Equipped with shielding equipment to reduce radiation damage.
The simulation of the oxidation behavior of zirconium alloy cladding tubes in high-temperature steam was achieved, providing design and R&D support for zirconium alloy cladding materials for reactors and reducing the radioactive risk to experimental operators.
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Figure CN121148754A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of loss of coolant accident test, in particular to a re-submerging device and method for irradiated cladding tube. BACKGROUND
[0002] Loss of coolant accident (LOCA) is a coolant loss accident caused by the breakage of nuclear reactor primary loop pipe, which is a very serious accident in the operation of the reactor, and is considered as a benchmark accident in the design of the reactor. When the loss of coolant accident occurs, the zirconium alloy cladding tube is oxidized by high-temperature steam and eventually quenched due to the refilling of the reactor core, which reduces the thickness and ductility of the zirconium alloy cladding tube, and the hydrogen generated by the zirconium-water reaction may cause hydrogen explosion, which poses a threat to the safety of the reactor. Therefore, it is very important to study the oxidation behavior of the zirconium alloy cladding tube in high-temperature steam for the safety of the reactor under LOCA conditions. How to provide a re-submerging device that can simulate the re-submerging process of the zirconium alloy cladding tube under the LOCA condition is the key to realizing the study of the oxidation behavior of the zirconium alloy cladding tube in high-temperature steam. SUMMARY
[0003] The present application aims to provide a re-submerging device and method for irradiated cladding tube to simulate the re-submerging process of the zirconium alloy cladding tube under the LOCA condition and realize the study of the oxidation behavior of the zirconium alloy cladding tube in high-temperature steam.
[0004] The present application is realized by the following technical solutions: A re-submerging device for irradiated cladding tube, comprising a heating furnace arranged inside a shielding device and a quenching water tank arranged outside the shielding device; a test sample is placed inside the heating furnace, and the quenching tank is in communication with the furnace body through a water inlet pipeline to provide deionized water for the heating furnace to submerge the test sample. The water inlet pipeline is provided with a water inlet valve; the heating furnace is connected with a drainage pipeline for draining the wastewater after the test, and the drainage pipeline is provided with a drainage valve.
[0005] Further, the quenching water tank is connected with a pressure charging assembly through a pressurizing pipeline, the pressure charging assembly is used for introducing compressed air into the quenching water tank, and the connecting port of the pressurizing pipeline on the quenching water tank is located above the liquid level inside the quenching water tank.
[0006] Further, the pressure charging assembly comprises a compressed air source and a pressurizing electromagnetic valve.
[0007] Further, the quenching water tank is connected with a water source storage tank through a water supplementing pipeline for storing deionized water, and the water supplementing pipeline is provided with a water supplementing pump and a water supplementing electromagnetic valve to supplement the deionized water for the quenching water tank.
[0008] Further, the quenching water tank is provided with a lower liquid level detection element and an upper liquid level detection element to supplement the deionized water when the liquid level inside the quenching water tank is below a preset lower limit height and to stop supplementing the deionized water when the liquid level reaches a preset upper limit height.
[0009] Further, the heating furnace is connected with a steam discharge pipeline to discharge the deionized water attached to the inner wall of the heating furnace in the form of steam before the test.
[0010] Further, the drain pipeline is connected with a waste water tank, and the waste outlet of the waste water tank is connected with a waste discharge valve.
[0011] Further, the waste water tank is provided with a waste water liquid level detection element to discharge the waste water from the waste water tank when the waste water reaches a preset height.
[0012] The application also provides a method for re-submerging an irradiated cladding tube, which adopts the re-submerging device and comprises the following steps: S1, heating furnace drying: before the experiment, the inner wall of the heating furnace is preheated by using the heating function of the heating furnace, the exhaust valve is opened, and the deionized water attached to the inner wall of the heating furnace is discharged in the form of steam; S2, high-temperature performance test of the test sample: the test sample is placed in the heating furnace by using the manipulator, and the test parameters including the test temperature are preset; when the test temperature of the test sample reaches the preset value, the holding time is set to hold the test sample; S3, quenching water tank pressure charging: during the holding, the compressed air source and the pressurizing electromagnetic valve are opened to make the quenching water tank reach a preset pressure; S4, re-submerging experiment: when the test sample reaches the preset holding time, the water inlet valve is opened, and the deionized water in the quenching water tank is quickly filled into the heating furnace under the action of the internal pressure; S5, waste water discharge: after the test, the drain valve is opened to make the deionized water in the heating furnace be discharged into the waste water tank, and when the liquid level in the waste water tank reaches the waste water liquid level detection element, the waste discharge valve is opened to make the waste water be discharged into the special discharge pipeline.
[0013] Further, before the quenching water tank is charged with pressure in step S3, the liquid level in the quenching water tank is first judged, if the liquid level is between the preset lower limit height and the preset upper limit height, no treatment is performed; if the liquid level is below the preset lower limit height, the water supplement pump and the water supplement electromagnetic valve are opened to supplement the deionized water for the quenching water tank.
[0014] The technical scheme of the present application has at least the following advantages and beneficial effects: in the present application, the heating furnace is arranged inside a shielding device (for example, a glove box or a hot chamber), which effectively shields the reflood device of the irradiated cladding tube, reduces the radioactive harm to the experimental operators and the experimental environment during the analysis process, the remaining auxiliary facilities and control system are arranged outside the shielding device, and the reflood process can be remotely controlled; in actual tests, after the test piece in the heating furnace is kept warm, the deionized water is poured into the heating furnace through the quenching water tank, the reflood process of the zirconium alloy cladding tube under the loss of coolant accident condition is simulated, and technical support is provided for the design and research and development of the zirconium alloy cladding material for the reactor. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 A structural schematic diagram of the reflood device of the irradiated cladding tube is provided in the present application. Figure 2 A flowchart of the reflood method of the irradiated cladding tube is provided in the present application. The figure shows that: 1 is a water source storage tank, 2 is a water supplement pump, 3 is a water supplement pipeline, 4 is a water supplement electromagnetic valve, 5 is a compressed air source, 6 is a quenching water tank, 7 is a pressurizing electromagnetic valve, 8 is a water inlet pipeline, 9 is a water inlet valve, 10 is a water outlet pipeline, 11 is a water outlet valve, 12 is a waste water tank, 13 is a waste water outlet valve, 14 is a heating furnace, 15 is an exhaust valve, 16 is a steam exhaust pipeline, 17 is an upper liquid level detection element, 18 is a lower liquid level detection element, and 19 is a waste water liquid level detection element. DETAILED DESCRIPTION
[0016] REFERENCE Figure 1 A reflood device of an irradiated cladding tube, comprising a heating furnace 14 and a quenching water tank 6, a test sample is placed in the heating furnace 14, the quenching tank is communicated with the furnace body through a water inlet pipeline 8 to provide deionized water for the heating furnace 14 to submerge the test sample. The water inlet pipeline 8 is provided with a water inlet valve 9, in actual tests, after the test piece in the heating furnace 14 is kept warm, the water inlet valve 9 is opened, the deionized water is poured into the heating furnace 14 through the quenching water tank 6, the reflood process of the zirconium alloy cladding tube under the loss of coolant accident condition is simulated, and technical support is provided for the design and research and development of the zirconium alloy cladding material for the reactor. In addition, The heating furnace 14 is arranged inside a shielding device (not shown in the figure, for example, a glove box or a hot chamber), which effectively shields the reflood device of the irradiated cladding tube, reduces the radioactive harm to the experimental operators and the experimental environment during the analysis process. It should be understood that a corresponding control system (not shown in the figure) should be configured to control the test parameters of the heating furnace 14 and various electrical elements, in actual application, the quenching water tank 6, the remaining auxiliary facilities and the control system are arranged outside the shielding device, and the reflood process can be remotely controlled.
[0017] The heating furnace 14 is connected with a drain pipeline 10 for discharging waste water after the test, and the drain pipeline 10 is provided with a drain valve 11. Further, the drain pipeline 10 is connected with a waste water tank 12, and the waste water tank 12 is connected with a waste discharge valve 13, so as to facilitate the centralized collection and discharge of waste water in the heating furnace 14. On this basis, the waste water tank 12 is provided with a waste water liquid level detection element 19, which is preferably a liquid level gauge (of course, it can also be a liquid level sensor or other element capable of realizing liquid level detection). In actual application, when the waste water liquid level detection element 19 detects that the liquid level in the waste water tank 12 reaches a preset height, the waste discharge valve 13 is opened to discharge the waste water in the waste water tank 12 into a special discharge pipeline (not shown in the figure).
[0018] The heating furnace 14 is connected with a steam discharge pipeline 16 provided with an exhaust valve 15. Before the test starts or after the test ends, the deionized water attached to the inner wall of the heating furnace 14 is difficult to discharge completely, and needs to be changed into a steam state by using the self-heating function of the heating furnace 14. The exhaust valve 15 is opened to discharge the deionized water from the steam discharge pipeline 16.
[0019] As an option, the above-mentioned water inlet valve 9, drain valve 11, waste discharge valve 13 and exhaust valve 15 are all air control ball valves, which can be automatically opened and closed by the control system. In other embodiments, they can also be electric valves.
[0020] In the present embodiment, the quenching water tank 6 is connected with a water source storage tank 1 through a water supplement pipeline 3 for storing deionized water. The water supplement pipeline 3 is provided with a water supplement pump 2 and a water supplement electromagnetic valve 4, which are opened to supplement deionized water to the quenching water tank 6. Further, the quenching water tank 6 is provided with a lower liquid level detection element 18 and an upper liquid level detection element 17. As can be easily understood, the lower liquid level detection element 18 detects a lower limit of the preset liquid level, and the upper liquid level detection element 17 detects an upper limit of the preset liquid level. In actual application, deionized water is supplemented when the liquid level in the quenching water tank 6 is lower than the preset lower limit, and the supplementation of deionized water is stopped when the liquid level reaches the preset upper limit. As an option, the lower liquid level detection element 18 and the upper liquid level detection element 17 are both liquid level gauges; in other embodiments, they can also be liquid level sensors or other elements capable of realizing liquid level detection.
[0021] As an option, the power of the deionized water in the quenching water tank 6 flowing into the heating furnace 14 in the embodiment adopts compressed air, facilitating the rapid filling of the deionized water into the heating furnace 14, and in actual application, the re-flooding speed thereof can be controlled within 1-10 seconds. Specifically, the quenching water tank 6 is connected with a pressurizing assembly through a pressurizing pipeline, and the connecting port of the pressurizing pipeline on the quenching water tank 6 is located above the liquid level inside the quenching water tank 6. Further, the pressurizing assembly comprises a compressed air source 5 and a pressurizing electromagnetic valve 7, and in actual application, the quenching water tank 6 can be pressurized by opening the compressed air source 5 and the pressurizing electromagnetic valve 7, and when the deionized water needs to be filled into the heating furnace 14, the water inlet valve 9 can be opened to fill the deionized water in the quenching water tank 6 into the heating furnace 14 under the action of the pressure.
[0022] It should be understood that the compressed air source 5 generally comprises an air compressor and an air storage tank, and the air compressor works to generate compressed air which is stored in the air storage tank. The pressurizing electromagnetic valve 7 is a switch for the compressed air to enter the quenching water tank 6, and in actual application, an electromagnetic valve with a pressure sensor or a separate pressure sensor on the quenching water tank 6 can be selected to facilitate the control of the pressurizing pressure.
[0023] Reference Figure 2 The embodiment also provides a re-flooding method of an irradiation cladding tube, which adopts the re-flooding device and comprises the following steps: S1, drying of the heating furnace 14: before the experiment, the inner wall of the heating furnace 14 is preheated by using the heating function of the heating furnace 14, the exhaust valve 15 is opened, and the deionized water adhering to the inner wall of the heating furnace 14 is discharged in the form of steam, so as to ensure that there is no deionized water remaining in the heating furnace 14 before the experiment; S2, high-temperature performance test of the test sample: the test sample is placed in the heating furnace 14 by using a mechanical hand, and each test parameter is preset, including the test temperature, the test atmosphere and the like; when the test temperature of the test sample reaches the preset value, the heat preservation time is set to perform heat preservation on the test sample; S3, pressurization of the quenching water tank 6: during the heat preservation, the compressed air source 5 and the pressurizing electromagnetic valve 7 are opened, so that the quenching water tank 6 reaches the preset pressure; in actual application, before the quenching water tank 6 is pressurized, the control system first judges the liquid level in the quenching water tank 6, and if the liquid level is between the preset lower limit height and the preset upper limit height, no treatment is performed; if the liquid level is lower than the preset lower limit height, the water supplement pump 2 and the water supplement electromagnetic valve 4 are opened to supplement the deionized water in the quenching water tank 6, and the supplement of the deionized water is stopped until the liquid level in the quenching water tank 6 reaches the preset upper limit height; S4, re-flooding experiment: when the test sample reaches the preset heat preservation time, the water inlet valve 9 is opened, and the deionized water in the quenching water tank 6 rapidly fills the heating furnace 14 under the action of the internal pressure; S5, wastewater discharge: after the end of the test, open the drain valve 11, make the deionized water in the heating furnace 14 discharge into the wastewater tank 12, when the liquid level in the wastewater tank 12 reaches the wastewater liquid level detection element 19, open the waste valve 13, make the wastewater discharge into the special discharge pipeline.
[0024] In addition, it is easy to understand that the re-submerging device and method provided by the embodiment can simulate the re-submerging process of the cladding tube under the condition of the loss of coolant accident, and can also simulate the high-temperature quenching test of the cladding tube. If other re-submerging or cladding tube quenching test devices are manufactured based on the design concept of the embodiment without making innovative structural design, they are still within the protection scope of the application.
[0025] The preferred embodiments of the application have been described above with the preferred embodiments, but are not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.
Claims
1. A re-submergence device for an irradiated cladding tube, characterized in that, It includes a heating furnace located inside the shielding equipment and a quenching water tank located outside the shielding equipment; the test sample is placed inside the heating furnace, and the quenching tank is connected to the furnace body through a water inlet pipe to provide deionized water to the heating furnace to submerge the test sample, and the water inlet pipe is equipped with a water inlet valve; the heating furnace is connected to a drainage pipe to discharge wastewater after the test, and the drainage pipe is equipped with a drainage valve.
2. The re-submergence device for the irradiated cladding tube according to claim 1, characterized in that, The quenching water tank is connected to a pressurization assembly via a pressurization pipeline. The pressurization assembly is used to introduce compressed air into the quenching water tank, and the connection port of the pressurization pipeline on the quenching water tank is located above the liquid level inside the quenching water tank.
3. The re-submergence device for the irradiated cladding tube according to claim 2, characterized in that, The pressurization assembly includes a compressed air source and a pressurization solenoid valve.
4. The re-submergence device for the irradiated cladding tube according to claim 3, characterized in that, The quenching water tank is connected to a water storage tank via a water supply pipeline for storing deionized water. The water supply pipeline is equipped with a water supply pump and a water supply solenoid valve to replenish the quenching water tank with deionized water.
5. The re-submergence device for the irradiated cladding tube according to claim 4, characterized in that, The quenching water tank is equipped with a lower liquid level detection element and an upper liquid level detection element, so that deionized water is added when the liquid level inside the quenching water tank is lower than the preset lower limit height, and the addition of deionized water is stopped when the liquid level reaches the preset upper limit height.
6. The re-submergence device for the irradiated cladding tube according to claim 5, characterized in that, The heating furnace is connected to a steam exhaust pipe to discharge the deionized water adhering to the inner wall of the heating furnace in the form of steam before the test. The steam exhaust pipe is equipped with an exhaust valve.
7. The re-submergence device for the irradiated cladding tube according to claim 6, characterized in that, The drainage pipe is connected to a wastewater tank, and the wastewater tank's discharge port is connected to a discharge valve.
8. The re-submergence device for the irradiated cladding tube according to claim 7, characterized in that, The wastewater tank is equipped with a wastewater level detection element to discharge the wastewater from the tank when the wastewater reaches a preset height.
9. A method for re-flooding an irradiated cladding tube, employing the re-flooding device as described in claim 8, characterized in that, Includes the following steps: S1. Drying in a heating furnace: Before the experiment begins, the inner wall of the heating furnace is preheated using its heating function. The exhaust valve is opened to discharge the deionized water adhering to the inner wall of the heating furnace in the form of steam. S2. High-temperature performance test of test specimens: The test specimens are placed in the heating furnace using a robotic arm, and test parameters, including the test temperature, are preset; after the test temperature of the test specimens reaches the preset value, the test specimens are kept at the temperature for a set time. S3. Quenching water tank pressurization: During the heat preservation period, open the compressed air source and the pressurization solenoid valve to make the quenching water tank reach the preset pressure; S4. Re-submersion test: When the test sample reaches the preset holding time, the water inlet valve is opened, and the deionized water in the quenching water tank is quickly filled into the heating furnace under the action of internal pressure. S5. Wastewater Discharge: After the test, open the drain valve to discharge the deionized water in the heating furnace into the wastewater tank. When the liquid level in the wastewater tank reaches the wastewater level detection element, open the wastewater discharge valve to discharge the wastewater into the special discharge pipeline.
10. The re-flooding method for the irradiated cladding tube according to claim 9, characterized in that, Before pressurizing the quenching water tank in step S3, the liquid level in the quenching water tank is first determined. If the liquid level is between the preset lower limit height and the preset upper limit height, no action is taken. If the liquid level is lower than the preset lower limit height, the water replenishment pump and the water replenishment solenoid valve are turned on to replenish the quenching water tank with deionized water.