Nuclear power plant material crevice corrosion test device

Abstract

The utility model relates to a crevice corrosion test device for a nuclear power plant material. The crevice corrosion test device comprises an autoclave, a corrosion sample and a circulation loop for simulating a loop coolant environment, the corrosion sample is detachably arranged in the autoclave and comprises a sample structure and a gap construction part, and the gap construction part is detachably arranged on the sample structure to construct a gap; and the high-pressure kettle is arranged in the circulation loop. According to the application, the scaling corrosion behavior of the gap between the material sample and the gap assembly sample can be researched under the condition closer to the actual service environment, and the accuracy of the corrosion test is improved, so that more real and accurate corrosion test data can be obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power, more particularly, to a nuclear power plant material crevice corrosion test device. BACKGROUND

[0002] The primary loop system of a nuclear power plant generally includes main equipment such as a pressure vessel, a steam generator, a main pump, a pressurizer, and a main pipe. During the operation of the nuclear power plant, the structural material of the primary loop system is exposed to high-temperature and high-pressure reactor coolant, and surface corrosion, release and deposition of corrosion products of the material occur. There are crevices at some local positions on the main equipment, such as between the electric heater of the pressurizer and the support plate, between the fuel rod and the structural assembly, and between the heat transfer tube of the steam generator and the support. When the material surface is locally overheated and boiling occurs, the ion concentration in the crevice is accelerated, thereby greatly accelerating the deposition of dirt in the crevice between the material and the support plate or other assembly, and crevice corrosion is prone to occur, affecting the safety of the material.

[0003] Therefore, it is generally necessary to carry out uniform corrosion tests on the structural material of the primary loop to test the corrosion performance of the structural material in the high-temperature and high-pressure water chemical environment of the primary loop. In conventional corrosion tests, the structural material is generally processed into small-sized metal coupons or short pipes, which are suspended inside an autoclave to test the corrosion performance thereof in the high-temperature and high-pressure water chemical environment. This method cannot simulate the corrosion conditions at the local crevices of the equipment, and conventional tests also cannot truly simulate the heating conditions of the material surface for some local heating positions, such as the electric heater of the pressurizer and the heat transfer tube. CONTENT OF THE UTILITY MODEL

[0004] The technical problem to be solved by the present application is to provide a nuclear power plant material crevice corrosion test device in view of the above defects of the prior art.

[0005] The technical solution adopted by the present application to solve the technical problem is that a nuclear power plant material crevice corrosion test device is constructed, which comprises:

[0006] an autoclave;

[0007] a corrosion test sample, which is detachably arranged in the autoclave and comprises a test sample structure and a crevice structure member, the crevice structure member being detachably arranged on the test sample structure to construct a crevice;

[0008] a circulating loop for simulating a primary loop coolant environment, and the autoclave is arranged in the circulating loop.

[0009] In some embodiments, the test sample structure is arranged in a tubular shape, and the crevice structure member is arranged in a hoop shape and detachably sleeved on the test sample structure.

[0010] In some embodiments, the sample structure comprises a sample tube and a support tube; the support tube is detachably arranged on the autoclave; the sample tube is arranged in the autoclave and sleeved on the support tube.

[0011] In some embodiments, the sample structure further comprises a heater, which is detachably arranged in the support tube and located in the sample tube.

[0012] In some embodiments, the corrosion sample further comprises a gap detection assembly for detecting water quality and / or temperature, which is arranged on the autoclave and extends to the position corresponding to the gap structure.

[0013] In some embodiments, the gap detection assembly comprises a sampling tube, a temperature detection tube and a water cooling jacket; the water cooling jacket is arranged on the autoclave, and the sampling tube and the temperature detection tube are arranged in the water cooling jacket; one end of the sampling tube extends to the gap between the gap structure and the sample structure, and one end of the temperature detection tube extends to the surface of the sample structure.

[0014] In some embodiments, the circulation loop comprises a water circulation pipeline and a water quality detection pipeline for detecting water quality; two ends of the water quality detection pipeline are respectively connected to the water circulation pipeline, and the autoclave is arranged on the water circulation pipeline.

[0015] In some embodiments, the water circulation pipeline comprises an inlet pipeline, an outlet pipeline, a return pipeline, a water supply pipeline, a heat exchanger and a water storage tank.

[0016] The outlet end of the inlet pipeline and the inlet end of the outlet pipeline are respectively connected to the autoclave, the outlet end of the return pipeline and the inlet end of the water supply pipeline are respectively connected to the water storage tank, and the inlet end of the inlet pipeline, the outlet end of the outlet pipeline, the inlet end of the return pipeline and the outlet end of the water supply pipeline are respectively connected to the heat exchanger.

[0017] In some embodiments, a preheater is arranged on the inlet pipeline.

[0018] And / or, a condenser is arranged on the return pipeline.

[0019] In some embodiments, two ends of the water quality detection pipeline are respectively connected to the return pipeline and the water supply pipeline.

[0020] In some embodiments, the water quality detection pipeline comprises a water quality detection pipeline and a dissolved oxygen detection probe, and / or a pH value detection probe, and / or an electrical conductivity detection probe arranged on the water quality detection pipeline.

[0021] The present application has at least the following beneficial effects:

[0022] The present application can accurately simulate the special environment of the primary loop by setting the autoclave and the circulation loop; the simulation of the gap structure on the equipment can be realized by setting the sample structure and the gap structure component, the gap fouling corrosion behavior between the material sample and the gap component sample can be researched under the condition of being closer to the actual service environment, the accuracy of the corrosion test can be improved, and more real and accurate corrosion test data can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0024] Figure 1 is a structural schematic diagram of a nuclear power plant material gap corrosion test device in some embodiments of the present application. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "up", "down", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0028] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connect", "fix" and the like should be broadly understood, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature can be above the second feature, which can be directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature can be below the second feature, which can be directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0030] Figure 1 A nuclear power plant material crevice corrosion test device 1 in an embodiment of the present application is shown, which can perform corrosion tests on various materials of equipment in the primary loop of a nuclear power plant, and can realize test detection of corrosion at the crevice thereof.

[0031] The nuclear power plant material crevice corrosion test device 1 can include an autoclave 10, a corrosion test sample 20, and a circulating loop 30. The autoclave 10 is arranged on the circulating loop 30 and is used to construct a high-pressure environment simulating the equipment in the primary loop. The corrosion test sample 20 is detachably arranged in the autoclave 10 and is used as a detection sample to be tested, simulating the equipment in the primary loop that needs to be tested for corrosion. The circulating loop 30 is used to construct a water circulating environment with specific water quality, simulating the environment of the primary loop coolant circulation, and improving the accuracy of the test environment of the corrosion test sample 20.

[0032] The corrosion test sample 20 can include a test sample structure 21 and a crevice structure 22. The test sample structure 21 is mainly used to simulate the equipment in the primary loop that needs to be tested for corrosion. The crevice structure 22 is detachably arranged on the test sample structure 21 and is used to construct a crevice by connecting with the test sample structure 21, thereby simulating the crevice on the equipment to be tested.

[0033] It should be understood that the equipment in the primary loop that needs to be tested for corrosion includes, but is not limited to, pressure vessels, steam generators, main pumps, pressure stabilizers, main pipes, etc., and also includes electric heaters, heat transfer pipes, etc. in the above-mentioned equipment, which are of various types. Therefore, the equipment simulated by the test sample structure 21 is not specifically limited here.

[0034] After the specific test, the corrosion sample 20 can be taken out of the autoclave 10 first, and then the corrosion sample 20 is cut to divide the sample structure 21 part (the part connected with the gap structure 22) and the rest of the sample structure 21. Further, the two parts after the division can be respectively detected and analyzed macroscopically and microscopically, and then the corrosion test results at the general position of the simulated related equipment and the corrosion test results at the gap position are obtained.

[0035] The present application can simulate the high-temperature and high-pressure environment of the primary loop by setting the autoclave 10. By setting the circulating loop 30, the water chemical parameters of the primary loop coolant, such as pH value, dissolved oxygen, dissolved hydrogen, etc. can be simulated. The cooperation of the autoclave 10 and the circulating loop 30 can accurately simulate the special environment of the primary loop, improve the accuracy of the corrosion test, and obtain more realistic and accurate corrosion test data.

[0036] The present application can realize the simulation of the gap structure on the equipment by setting the sample structure 21 and the gap structure 22, and research the gap fouling corrosion behavior between the material sample and the gap component sample under the condition of being closer to the actual service environment. It is of great significance to clarify the fouling mechanism on the surface of the material at the gap position and control the corrosion rate.

[0037] The present application can flexibly replace the gap structure 22 by detachably setting the gap structure 22 on the sample structure 21, so as to replace the gap structure 22 of different sizes according to different equipment conditions, and then construct gaps of different sizes, further improving the accuracy of the test.

[0038] It should be understood that the autoclave 10 can be realized by using the existing autoclave structure, including the autoclave body, the pressure control system and the like. The specific shape and size of the autoclave body can be flexibly set according to the corrosion test condition, which is not limited here.

[0039] In some embodiments, the sample structure 21 is tubular and detachably arranged in the autoclave 10. The gap structure 22 is in the form of a hoop and is detachably sleeved on the sample structure 21.

[0040] By setting the gap structure 22 in the form of a hoop, flexible disassembly and assembly can be realized. By adjusting the length of the hoop-shaped gap structure 22 along the axial direction, the size of the gap can be adjusted to simulate gaps of different sizes.

[0041] In some embodiments, the sample structure 21 comprises a sample tube 211 and a support tube 212. The sample tube 211 is arranged in the autoclave 10 and sleeved on the support tube 212 as a sample structure of the equipment to be subjected to the corrosion test. The support tube 212 is detachably arranged in the autoclave 10 and used as a support for the sample tube 211 to fix the sample tube 211 in the autoclave 10.

[0042] Further, the sample tube 211 can be a tubular structure with both ends penetrating through, and the sample structure 21 can further comprise at least two fixing members 213. The at least two fixing members 213 block both ends of the sample tube 211, and the tubular sample tube 211 can be fixed on the support tube 212 through the fixing members 213.

[0043] In Figure 1 In the illustrated embodiments, the fixing members 213 are nut-shaped plug structures, and there are four of them, two of which are arranged at each end of the sample tube 211. The support tube 212 has both ends penetrating through, and one end extends out of the autoclave 10, and the other end extends into the autoclave 10, and the whole is fixed with the autoclave 10 to support the sample tube 211.

[0044] In some embodiments, the sample structure 21 can further comprise a heater (not shown in the figure) which is detachably arranged in the hollow tube of the support tube 212 and extends into the sample tube 211 through the support tube 212. It can be connected to an external power source through the end of the support tube 212 penetrating through to heat the sample tube 211.

[0045] The arrangement of the heater can simulate the high-temperature heating condition of part of the equipment (such as the electric heating of the primary stabilizer of the nuclear power plant, the fuel assembly, the heat transfer pipe of the steam generator, etc.), further improve the accuracy of the corrosion test, and obtain more accurate and real corrosion test data.

[0046] It should be understood that the heater can adopt an existing heating rod to be arranged in the support tube 212. The heater can be provided with a fixed power density or a variable power density to realize constant temperature or variable temperature heating.

[0047] In other optional embodiments, the sample tube 211 can also be provided in a non-tubular structure such as a sheet, a block, a cylinder, etc. Correspondingly, the gap structure 22 can also be adjusted in structure, such as being provided in a sheet, a cylinder, etc. to realize connection with the sample tube 211 to correspondingly contact the gap.

[0048] In some alternative embodiments, the fixing member 213 can be omitted, and the sample tube 211 can be directly connected to the support tube 212 by changing the structure of the sample tube 211 and / or the support tube 212 (e.g., by providing a structure with hooks or a support platform) or by changing the connection process (e.g., welding) between the sample tube 211 and the support tube 212. The heater can also be directly fixed to the sample tube 211.

[0049] In some embodiments, the corrosion sample 20 can further include a crevice detection assembly 23. The crevice detection assembly 23 is arranged through the autoclave 10 and extends to a position corresponding to the crevice structure 22, and is used to detect the water quality and / or temperature around the crevice structure 22, so as to more accurately analyze and judge the corrosion condition at the crevice structure 22.

[0050] In Figure 1 In the illustrated embodiment, the crevice detection assembly 23 includes a sampling tube 231, a temperature detection tube 232, a first temperature detector (not shown), and a water cooling jacket 233. The water cooling jacket 233 is arranged through the autoclave 10, and the sampling tube 231 and the temperature detection tube 232 are arranged in the water cooling jacket 233 and are fixed on the autoclave 10 by the water cooling jacket 233. The first temperature detector is arranged in the temperature detection tube 232 and is used to detect the temperature at the corresponding position.

[0051] One end of the sampling tube 231 is located outside the water cooling jacket 233 and the autoclave 10, and the other end extends through the water cooling jacket 233 and the autoclave 10 and extends to between the crevice structure 22 and the sample structure 21, and is used to obtain the water sample between the crevice structure 22 and the sample structure 21.

[0052] It should be understood that, in the current test process, since the autoclave is in a closed high-temperature and high-pressure state, even if the crevice can be formed, it is difficult to obtain the real water quality of the liquid in the crevice, and thus it is difficult to clearly determine the mechanism of the accelerated deposition of the dirt in the crevice. By arranging the sampling tube 231, the water sample at the crevice can be extracted during the test process, and thus the detection and analysis of the water quality at the crevice can be realized, and the accelerated deposition mechanism of the dirt in the locally overheated crevice can be better detected and researched, and the concentration of the coolant at the local position can be analyzed.

[0053] Since the autoclave 10 is in a high-pressure environment, there is a large pressure difference between the autoclave 10 and the external environment. Since the autoclave 10 is located on the circulating loop 30, high-pressure water flows in the autoclave 10 to simulate the environment of the high-pressure coolant water in the primary loop. The sampling tube 231 is located at the pipe section of the water cooling jacket 233 and the autoclave 10, and a valve can be arranged to open and close the sampling tube 231, so as to prevent the high-pressure water in the autoclave 10 from flowing out, and thus maintain the high-pressure environment in the autoclave 10.

[0054] When water at the gap needs to be sampled, the valve can be opened to connect the space inside the autoclave 10 with the external environment through the sampling pipe 231. Since there is a pressure difference between the two ends of the sampling pipe 231, water at the gap in the autoclave 10 can automatically flow out along the sampling pipe 231 under the driving of the pressure difference, thereby achieving sampling of water quality at the gap.

[0055] The temperature detection pipe 232 can be arranged as a relatively closed hollow structure to avoid damaging the high-pressure environment inside the autoclave 10. The first temperature detector is arranged in the temperature detection pipe 232 to avoid being damaged by the water quality in the autoclave 10, and can also lead the electrically connected lead wire out through the temperature detection pipe 232. One end of the temperature detection pipe 232 is located outside the water cooling jacket 233 and the autoclave 10, and the other end extends to the surface of the sample structure 21 through the water cooling jacket 233 and the autoclave 10, and is located around the gap structure 22, for obtaining the temperature condition around the gap. When the temperature detected by the first temperature detector does not meet the target temperature required for simulation of the test at the gap, the temperature can be increased by adjusting the temperature of the circulating water in the circulating loop 30 and adjusting the heating power of the heater in the sample structure 21, thereby improving the accuracy of the test.

[0056] It should be understood that the water cooling jacket 233 can cool the pipe sections at the corresponding positions of the sampling pipe 231 and the temperature detection pipe 232.

[0057] In other optional embodiments, the gap detection assembly 23 can also only be arranged with structures for detecting water quality, or only be arranged with structures for detecting temperature.

[0058] In some embodiments, the circulating loop 30 includes a water circulating pipeline 31 and a water quality detection pipeline 32. The autoclave 10 is arranged on the water circulating pipeline 31 to simulate an environment of a loop coolant by circulating water. The two ends of the water quality detection pipeline 32 are respectively connected to two different positions on the water circulating pipeline 31 to detect the water quality of the circulating water in the water circulating pipeline 31, so that the water quality parameters of the coolant in the loop are approached, and the accuracy of the test is further improved.

[0059] Further, the water circulating pipeline 31 can include a water inlet pipe 311, a water outlet pipe 312, a water return pipe 313, a water delivery pipe 314, a heat exchanger 3101, and a water outlet tank 3102.

[0060] The outlet of the water inlet pipeline 311 is connected with the water inlet of the autoclave 10, and the outlet is connected with the first water outlet of the heat exchanger 3101. The inlet of the water outlet pipeline 312 is connected with the water outlet of the autoclave 10, and the outlet is connected with the first water inlet of the heat exchanger 3101. The outlet of the water return pipeline 313 is connected with the water inlet of the water storage tank 3102, and the inlet is connected with the second water outlet of the heat exchanger 3101. The inlet of the water supply pipeline 314 is connected with the water outlet of the water storage tank 3102, and the outlet is connected with the second water inlet of the heat exchanger 3101.

[0061] By arranging the heat exchanger 3101, the heat in the water circulation pipeline 31 can be recycled and reused, thereby improving the energy utilization rate of the nuclear power plant material crevice corrosion test device 1 and saving energy.

[0062] In the specific test process, the circulating water can flow out of the water outlet of the water storage tank 3102, enter the heat exchanger 3101 through the water supply pipeline 314 and the second water inlet of the heat exchanger 3101. Then, the water enters the autoclave 10 through the first water outlet of the heat exchanger 3101 and the water inlet pipeline 311. Then, the water flows out of the water outlet in the autoclave 10, enters the heat exchanger 3101 through the water outlet pipeline 312 and the first water inlet of the heat exchanger 3101. Then, the water enters the water storage tank 3102 through the second water outlet of the heat exchanger 3101 and the water return pipeline 313, and realizes circulation.

[0063] It should be understood that the water in the water return pipeline 313, the water supply pipeline 314 and the water storage tank 3102 is low-temperature water with relatively low temperature, and the water in the water inlet pipeline 311, the water outlet pipeline 312 and the autoclave 10 is high-temperature water with relatively high temperature. In the circulation process, the low-temperature water entering the heat exchanger 3101 from the water supply pipeline 314 can exchange heat with the high-temperature water entering the heat exchanger 3101 from the water outlet pipeline 312, so that the temperature of the water in the water return pipeline 313 is lower than the temperature of the water in the water outlet pipeline 312, and the temperature of the water in the water inlet pipeline 311 is higher than the temperature of the water in the water supply pipeline 314.

[0064] In some embodiments, a preheater 3103 is arranged on the water inlet pipeline 311 to preheat and warm the water in the water inlet pipeline 311, so as to control the temperature of the circulating water entering the autoclave 10.

[0065] In some embodiments, a condenser 3104 can also be arranged on the water return pipeline 313 to cool the water in the water return pipeline 313, so as to control the temperature of the circulating water returning to the water storage tank 3102.

[0066] In some other alternative embodiments, the water circulation pipeline 31 may not include a return water pipeline 313, a supply water pipeline 314, or a heat exchanger 3101. The two ends of the inlet pipe 311 can be connected to the water storage tank 3102 and the autoclave 10, respectively, and the two ends of the outlet pipe 312 can also be connected to the water storage tank 3102 and the autoclave 10, respectively. A preheater 3103 is installed on the inlet pipe 311, and a condenser 3104 is installed on the outlet pipe 312.

[0067] In some embodiments, a pressure sensor may also be provided on the water storage tank 3102 to monitor the pressure inside the water storage tank 3102.

[0068] In some embodiments, a circulation pump 3105 may also be installed on the water supply pipeline 314 to pump water out of the water storage tank 3102 and realize water circulation.

[0069] In some embodiments, a high-pressure pump 3106 may also be installed on the water supply pipeline 314, which may be located downstream of the circulation pump 3105 to increase the pressure of the circulating water flowing in the water circulation pipeline 31, thereby increasing the flow rate.

[0070] In some embodiments, a back pressure valve 3107 is provided on the return water pipe 313, which can be located at the outlet end of the condenser 3104 to control the unidirectional flow of circulating water on the return water pipe 313.

[0071] In some embodiments, valves may also be provided on the inlet pipe 311 and / or outlet pipe 312 to facilitate control of the opening and closing of the pipes. These valves may be regulating valves, solenoid valves, back pressure valves, etc., and are not limited thereto.

[0072] In some embodiments, a flow meter 3108 is installed on the return water pipe 313 and / or the supply water pipe 314 to monitor the flow rate in the pipe. During the test, the opening of the circulation pump 3105, and / or the high-pressure pump 3106, and / or the valve can be adjusted based on the flow rate feedback from the flow meter 3108, thereby controlling the flow rate in the circulation loop.

[0073] Specifically, in Figure 1 In the illustrated embodiment, the flow meter 3108 on the return water pipe 313 is located downstream of the back pressure valve 3107, and the flow meter 3108 on the water supply pipe 314 is located downstream of the high pressure pump 3106.

[0074] In some embodiments, a second temperature detector 3109 may also be provided on the water inlet pipe 311 to detect the temperature of the circulating water in the water inlet pipe 311. By detecting the water temperature in the water inlet pipe 311, the water temperature in the autoclave 10 can be determined. If there is a deviation from the target water temperature required for the test, the water temperature can be adjusted by adjusting the power of the preheater 3103.

[0075] It should be understood that the first temperature detector located in the temperature detection tube 232 and the second temperature detector 3109 on the water circulation pipeline 31 can be implemented using existing thermocouples, temperature sensors, radiation pyrometers, etc., without specific limitations.

[0076] In some embodiments, the two ends of the water quality testing pipeline 32 can be connected to the return water pipeline 313 and the water supply pipeline 314, respectively.

[0077] Specifically, the water quality testing pipeline 32 may include a water quality testing pipe 321. This water quality testing pipe 321 may be equipped with a dissolved oxygen detection probe 322, and / or a pH detection probe 323, and / or a conductivity detection probe 324. This setup allows for the determination of the similarity between the dissolved oxygen content, pH value, and / or conductivity data in the circulating water and the primary coolant, facilitating timely adjustments to the water quality in the circulating loop and further improving the accuracy of the test.

[0078] exist Figure 1 In the illustrated embodiment, the first end of the water quality testing pipe 321 is connected to the water supply pipe 314, and the second end is connected to the return water pipe 313. The dissolved oxygen detection probe 322, pH detection probe 323, and conductivity detection probe 324 are respectively installed on the water quality testing pipe 321, with the dissolved oxygen detection probe 322 located upstream of the pH detection probe 323, and the pH detection probe 323 located upstream of the conductivity detection probe 324.

[0079] Furthermore, the connection point of the first end of the water quality testing pipe 321 on the water supply pipe 314 is located between the circulating pump 3105 and the high-pressure pump 3106. This connection position facilitates the relatively gentle circulating water pumped by the circulating pump 3105 to pass through the water quality testing pipe 321 for water quality testing. The remaining circulating water then passes through the high-pressure pump 3106 located downstream of the water quality testing pipe 321, and after high-pressure output, completes the loop circulation.

[0080] In some optional embodiments, the first end of the water quality detection pipeline 32 can be connected to one of the water inlet pipeline 311, the water outlet pipeline 312, the backwater pipeline 313 and the water delivery pipeline 314, and the second end can also be connected to one of the water inlet pipeline 311, the water outlet pipeline 312, the backwater pipeline 313 and the water delivery pipeline 314. When the two ends of the water quality detection pipeline 32 are connected to the same pipeline, the two ends are connected to different positions of the pipeline.

[0081] In some embodiments, the support pipeline 212, the sampling pipeline 231, the temperature detection pipeline 232, the water inlet pipeline 311 and the water outlet pipeline 312 can be made of stainless steel to avoid corrosion and improve the stability of the test equipment.

[0082] In some embodiments, the openings of the autoclave 10 for connecting to the pipelines can be sealed by full welding to ensure a stable high-pressure environment in the autoclave during the test.

[0083] It can be understood that the above technical features can be used in any combination without limitation.

[0084] The above embodiments only express the specific implementation of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and some modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application should belong to the scope of the claims of the present application.

Claims

1. A nuclear power plant material crevice corrosion test device characterized by, The utility model relates to a corrosion test sample (20) and a circulating loop (30) for simulating a primary coolant environment. The utility model relates to a corrosion test sample (20) and a circulating loop (30) for simulating a primary coolant environment. The test sample structure (21) is tubular, and the gap structure member (22) is a hoop that is detachably sleeved on the test sample structure (21). The test sample structure (21) comprises a test sample tube (211) and a support tube (212); the support tube (212) is detachably penetrated on the autoclave (10); and the test sample tube (211) is arranged in the autoclave (10) and sleeved on the support tube (212).

2. The nuclear power plant material crevice corrosion test apparatus according to claim 1, characterized by, The test sample structure (21) further comprises a heater (214) that is detachably arranged in the support tube (212) and located in the test sample tube (211).

3. The nuclear power plant material crevice corrosion test apparatus according to claim 1, characterized by, The corrosion test sample (20) further comprises a gap detection assembly (23) for detecting water quality and / or temperature; the gap detection assembly (23) is penetrated on the autoclave (10) and extends to a position corresponding to the gap structure member (22).

4. The nuclear power plant material crevice corrosion test apparatus according to claim 3, characterized by The gap detection assembly (23) comprises a sampling tube (231), a temperature detection tube (232) and a water cooling jacket (233); the water cooling jacket (233) is penetrated on the autoclave (10), and the sampling tube (231) and the temperature detection tube (232) are penetrated in the water cooling jacket (233); one end of the sampling tube (231) extends to a position between the gap structure member (22) and the test sample structure (21), and one end of the temperature detection tube (232) extends to a surface of the test sample structure (21).

5. The nuclear power plant material crevice corrosion test apparatus according to claim 1, characterized by The circulating loop (30) comprises a water circulating pipeline (31) and a water quality detection pipeline (32) for detecting water quality; two ends of the water quality detection pipeline (32) are respectively connected with the water circulating pipeline (31), and the autoclave (10) is arranged on the water circulating pipeline (31).

6. The nuclear power plant material crevice corrosion test apparatus according to claim 5, characterized by The water circulating pipeline (31) comprises an inlet pipeline (311), an outlet pipeline (312), a return pipeline (313), a water conveying pipeline (314), a heat exchanger (3101) and a water storage tank (3102).

7. The nuclear power plant material crevice corrosion test apparatus according to any one of claims 1 to 6, characterized by The outlet end of the inlet pipeline (311) and the inlet end of the outlet pipeline (312) are respectively connected with the autoclave (10); the outlet end of the return pipeline (313) and the inlet end of the water conveying pipeline (314) are respectively connected with the water storage tank (3102); and the inlet end of the inlet pipeline (311), the outlet end of the outlet pipeline (312), the inlet end of the return pipeline (313) and the outlet end of the water conveying pipeline (314) are respectively connected with the heat exchanger (3101).

8. The nuclear power plant material crevice corrosion test apparatus according to claim 7, characterized by A preheater (3103) is arranged on the inlet pipeline (311). ​ 9. The nuclear power plant material crevice corrosion test apparatus according to claim 8, characterized by ​ And / or, a condenser (3104) is arranged on the backwater pipeline (313).

10. The nuclear power plant material crevice corrosion test apparatus according to claim 8, characterized by Two ends of the water quality detection pipeline (32) are respectively connected with the backwater pipeline (313) and the water delivery pipeline (314).

11. The nuclear power plant material crevice corrosion test apparatus according to claim 7, characterized by The water quality detection pipeline (32) comprises a water quality detection pipeline (321), and a dissolved oxygen detection probe (322), and / or a pH value detection probe (323), and / or an electric conductivity detection probe (324) arranged on the water quality detection pipeline (321).

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