Loop irradiation test apparatus for reactors

Abstract

Embodiments of the present application relate to the technical field of nuclear reactor testing, and particularly relate to a loop irradiation test device for a reactor, which is used for placing an irradiation sample in a core of the reactor for irradiation test. The device comprises: a shell, which comprises a body part, an upper connecting part connected with the body part and a lower connecting part connected with the body part, the upper connecting part is used for being installed on a head cover of the reactor, and the lower connecting part is used for being installed on a core vacancy of the reactor; an inner shell, which is arranged in an interior of the shell, and the irradiation sample is arranged in the inner shell; a cooling flow path is formed in the inner shell, a coolant outside the reactor can enter the cooling flow path to cool the irradiation sample, and then return to the outside of the reactor. The loop irradiation test device provided by the embodiments of the present application makes that basically no large amount of heat enters the reactor, and the influence on the reactor is small; it is beneficial to control the cooling effect of the coolant on the irradiation sample, and can ensure that the outlet temperature of the coolant is not too large, and the design difficulty of the equipment outside the device is reduced.

Description

Technical Field

[0001] The embodiments of this application relate to the field of nuclear reactor testing, and more specifically to a loop-type irradiation test apparatus for reactors. Background Technology

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

[0003] During service, the fuel and structural materials in a reactor may undergo changes in performance due to irradiation, which may affect the safe and stable operation of the reactor. Therefore, it is necessary to study the performance changes of fuel and structural materials after irradiation.

[0004] To study the performance changes of fuel and structural materials after irradiation, irradiated samples made of fuel or structural materials are usually placed in an irradiation container, which is then placed in a reactor for irradiation tests to study the performance changes of the materials after irradiation. However, because irradiated samples (especially when the samples are irradiated components) generate heat during the irradiation test, this heat can enter the reactor and have a certain impact on the reactor. Summary of the Invention

[0005] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] In related technologies, the heat generated by the irradiated sample during the irradiation test is entirely carried away by the in-reactor coolant. This heat will enter the reactor along with the in-reactor coolant, causing a certain impact on the reactor. In particular, when the irradiated sample is a fuel assembly, the fuel assembly releases a lot of heat during the test, resulting in a greater impact on the reactor.

[0007] To address the aforementioned issues, embodiments of this application provide a loop-type irradiation test apparatus for reactors, used to place irradiated samples in the reactor core for irradiation testing.

[0008] The loop-type irradiation test apparatus provided in the embodiments of this application includes an outer shell and an inner shell. The outer shell includes a main body, an upper connecting part and a lower connecting part connected to the main body, the upper connecting part being used for installation on the reactor top cover, and the lower connecting part being used for installation in a reactor core vacancy; the inner shell is disposed inside the outer shell, and the irradiated sample is disposed in the inner shell; wherein, a cooling flow path is formed inside the inner shell, and a first coolant outside the reactor can enter the cooling flow path to cool the irradiated sample, and then return to the outside of the reactor.

[0009] The loop-type irradiation test apparatus provided in the embodiments of this application can cool the irradiated sample using a first coolant outside the reactor. The cooled first coolant can return to the outside of the reactor, and there is a heat insulation cavity between the first coolant and the coolant inside the reactor, so that a large amount of heat does not enter the reactor, minimizing the impact on the reactor. At the same time, the first coolant enters the cooling flow path to cool the irradiated sample, and the cooling effect of the irradiated sample can be precisely controlled by adjusting the inlet temperature and flow rate of the first coolant. In addition, a regenerative flow path is set up so that the first coolant exchanges heat with the second coolant outside the reactor before flowing out of the irradiation device, ensuring that the outlet temperature of the first coolant is not too high, reducing the difficulty of designing the external equipment. Attached Figure Description

[0010] Other objects and advantages of this application will become apparent from the following description of embodiments of this application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of this application.

[0011] Figure 1 This is a schematic diagram of the structure of a loop-type irradiation test apparatus for a reactor provided in an embodiment of this application.

[0012] Figure 2 yes Figure 1 A partially enlarged view of the loop-type irradiation test apparatus is shown.

[0013] Figure 3 yes Figure 1 Another enlarged view of the loop-type irradiation test apparatus is shown.

[0014] Explanation of reference numerals in the attached figures:

[0015] 100. Loop-type irradiation test apparatus;

[0016] 10. Outer shell; 11. Main body; 111. In-core coolant outlet; 12. Upper connection; 120. Outer cover; 121. Air inlet passage; 101. In-core coolant inlet;

[0017] 20. Inner shell; 201. First coolant inlet; 202. Second coolant inlet; 203. First coolant outlet; 204. Second coolant outlet; 205. Air inlet;

[0018] 300. Cooling flow path; 301. Cooling descending channel; 302. Cooling rising channel;

[0019] 41. First partition section; 42. Second partition section; 43. Third partition section; 44. Fourth partition section; 45. Fifth partition section; 431. In-core coolant flow chamber; 400. Regenerative flow path; 401. Regenerative rising channel; 402. Regenerative descending channel;

[0020] 501, First heat insulation cavity; 502, Second heat insulation cavity; 503, Third heat insulation cavity;

[0021] 61. First cover; 62. Second cover; 63. Third cover; 64. Fourth cover; 65. Fifth cover; 651. Air intake passage; 601. First sealing cavity; 602. Second sealing cavity; 603. Third sealing cavity; 604. Fourth sealing cavity;

[0022] 70. Regenerating shell;

[0023] 80. Connectors;

[0024] 90. Molten material collector; 91. Diverter column;

[0025] 200. Irradiated sample; 210. Irradiated shell.

[0026] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0027] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0028] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0029] Embodiments of this application provide a loop-type irradiation test apparatus for a reactor, used to place irradiated samples in the reactor core for irradiation testing.

[0030] See Figure 1 The loop-type irradiation test apparatus 100 provided in the embodiments of this application may include an outer shell 10 and an inner shell 20. The outer shell 10 may include a main body 11, an upper connecting part 12 connected to the main body 11, and a lower connecting part. The upper connecting part 12 is used to install on the reactor top cover, and the lower connecting part is used to install on the reactor core vacancy. The inner shell 20 is disposed inside the outer shell 10, and the irradiated sample 200 may be disposed in the inner shell 20. A cooling flow path 300 is formed inside the inner shell 20, and a first coolant outside the reactor can enter the cooling flow path 300 to cool the irradiated sample 200, and then return to the outside of the reactor.

[0031] The loop-type irradiation test apparatus 100 provided in the embodiments of this application can cool the irradiated sample 200 using a first coolant outside the reactor (i.e., outside the reactor's reactor vessel). The cooled first coolant can return to the outside of the reactor, and there is a heat insulation cavity between the first coolant and the coolant inside the reactor, so that basically no large amount of heat enters the reactor vessel, minimizing the impact on the reactor. At the same time, the first coolant enters the cooling flow path 300 to cool the irradiated sample 200, and the cooling effect on the irradiated sample 200 can be precisely controlled by adjusting the inlet temperature and flow rate of the first coolant. In addition, a regenerative flow path 400 is provided so that the first coolant exchanges heat with the second coolant outside the reactor before flowing out of the irradiation device, ensuring that the temperature of the first coolant outlet 203 is not too high, reducing the difficulty of designing external equipment.

[0032] In related technologies, when the irradiated sample is a fuel assembly, the irradiation test can only be conducted in the coolant within the reactor's reactor vessel. The irradiation test temperature also depends on the temperature of the coolant within the reactor's reactor vessel, resulting in a single irradiation test condition.

[0033] The embodiments of this application cool the irradiated sample 200 by introducing a first coolant outside the reactor. By changing the type, temperature, and flow rate of the first coolant, the irradiated sample 200 can be placed in various coolant environments (i.e., test environment media) for irradiation testing, rather than being limited to the coolant environment inside the reactor vessel. The loop-type irradiation test apparatus 100 provided by the embodiments of this application provides an enclosed environment for the irradiated sample 200 inside the reactor, isolating different test environment media from the coolant inside the reactor vessel, thus enriching the irradiation test conditions.

[0034] The loop-type irradiation test apparatus 100 provided in the embodiments of this application is installed in the reactor core through the upper connecting part 12 and the lower connecting part, so as to install the irradiated sample 200 in the reactor core for irradiation test, which is convenient to operate.

[0035] In some embodiments, the first coolant is, for example, liquid sodium.

[0036] In some embodiments, the irradiated sample 200 may be a fuel assembly, wherein the fuel assembly comprises a plurality of fuel elements assembled together.

[0037] In some embodiments, the upper connection 12 is installed at the cock of the reactor top cover. The cock may be provided with a pipe seat, and the upper connection 12 is connected to the pipe seat of the cock by a flange and bolts.

[0038] In some embodiments, the structure of the lower connector can be the same as that of the connector of the core assembly used for inserting into the core cavity. During installation, the lower connector can be directly inserted into the core cavity of the grid header of the core.

[0039] In some embodiments, a regenerative flow path 400 may also be formed within the inner shell 20, allowing a second coolant from outside the reactor to enter the regenerative flow path 400 to cool the first coolant flowing through the irradiated sample 200 in the cooling flow path 300, before returning to the outside of the reactor. In such an embodiment, the second coolant outside the reactor can remove heat from the cooling flow path 300, lowering the temperature of the first coolant in the cooling flow path 300 after heat exchange with the irradiated sample 200, thus simplifying the design of external equipment. The second coolant may be, for example, liquid sodium.

[0040] See Figure 1 In some embodiments, the cooling flow path 300 may include a cooling descending channel 301 located radially outward and a cooling ascending channel 302 located radially inward. The irradiated sample 200 is located at the bottom of the cooling ascending channel 302. A first coolant from the cooling descending channel 301 enters the cooling ascending channel 302 and carries away heat from the irradiated sample 200 as it flows through it. In such embodiments, the first coolant from the cooling descending channel 301 has a lower temperature. This lower-temperature first coolant flows downward into the cooling ascending channel 302, exchanges heat with the irradiated sample 200, and then flows upward along the cooling ascending channel 302 away from the reactor after its temperature rises. Because the cooling descending channel 301 is located radially outward and the cooling ascending channel 302 is located radially inward, and the irradiated sample 200 is located at the bottom of the cooling ascending channel 302, the radially outward cooling descending channel 301 can separate the irradiated sample 200 from the coolant in the reactor, reducing the transfer of heat from the irradiated sample 200 to the reactor.

[0041] See Figure 1 and Figure 2 In some embodiments, a first heat-insulating cavity 501 may be formed within the inner shell 20, positioned between the cooling descending channel 301 and the cooling ascending channel 302. This reduces heat exchange between the first coolant in the cooling descending channel 301 and the irradiated sample 200, and between the first coolant in the cooling ascending channel 302. This ensures that the relatively low-temperature first coolant (e.g., 300°C) remains at a relatively low temperature before flowing through the irradiated sample 200, thus guaranteeing a cooling effect on the irradiated sample 200. Furthermore, in such embodiments, by controlling the temperature and flow rate of the first coolant inlet 201, the heat carried out of the irradiation container by the first coolant in the cooling descending channel 301 is reduced. This increases the temperature of the first coolant at the upper outlet of the irradiated sample 200. When the irradiated sample 200 is a fuel assembly, it can simulate a condition where the fuel assembly outlet is at a higher temperature (e.g., 900°C), which is much higher than the outlet temperature of the irradiated sample when using the reactor internal coolant to conduct an irradiation test on the irradiated sample 200.

[0042] In some embodiments, gas can be introduced into the first heat insulation cavity 501 and maintained at a certain pressure. The gas introduced into the first heat insulation cavity 501 can be an inert gas, such as argon. By setting the type and concentration of gas in the first heat insulation cavity 501, the thermal conductivity of the first heat insulation cavity 501 can also be adjusted, thereby controlling the heat exchange with the first coolant in the cooling descending channel 301 and the first coolant in the cooling ascending channel 302 and the irradiated sample 200.

[0043] See Figure 1 and Figure 2In some embodiments, the loop-type irradiation test apparatus 100 may further include a first partition 41 and a second partition 42. The first partition 41 and the second partition 42 are disposed within the inner shell 20, with the first partition 41 located radially outward of the second partition 42. The upper end of the irradiation shell 210 of the irradiated sample 200 is connected to the lower end of the second partition 42, and the lower end of the irradiation shell 210 of the irradiated sample 200 is connected to the bottom end of the first partition 41. The first partition 41 and the inner shell 20 form a cooling descending channel 301, the second partition 42 forms a cooling ascending channel 302, and the first partition 41, the second partition 42, and the irradiation shell 210 of the irradiated sample 200 form a first heat insulation cavity 501. In this embodiment, by providing the first partition 41 and the second partition 42, a cooling rising channel 302 and a cooling falling channel 301 are formed inside the inner shell 20, which facilitates the flow of the first coolant inside the inner shell 20 and facilitates the cooling of the irradiated sample 200 by the first coolant. At the same time, the first partition 41, the second partition 42 and the irradiation shell 210 of the irradiated sample 200 can form a first heat insulation cavity 501 to reduce the heat exchange between the first coolant in the cooling falling channel 301 and the irradiated sample 200, as well as between the first coolant in the cooling rising channel 302 and the first coolant in the cooling rising channel 302.

[0044] See Figure 1 and Figure 2 In some embodiments, the loop-type irradiation testing apparatus 100 may further include a connector 80, which is disposed at the bottom of the second partition 42 and used to connect the second partition 42 to the first partition 41. Since the first partition 41 and the second partition 42 are relatively long, the connector 80 can prevent radial swaying of the first partition 41 and the second partition 42, thus helping to ensure the stability of the first coolant flow. In such embodiments, since the connector 80 is disposed in the heat insulation cavity, it does not affect the flow of the first coolant in the cooling flow path 300.

[0045] Since the upper end of the irradiation shell of the irradiated sample 200 is connected to the lower end of the second partition 42, setting the connector 80 at the bottom of the second partition 42 also helps to improve the stability of the irradiated sample 200.

[0046] See Figure 1 In some embodiments, the loop-type irradiation test apparatus 100 may further include a third partition 43 disposed between the body portion 11 of the outer shell 10 and the inner shell 20. The third partition 43 and the inner shell 20 form a second heat insulation cavity 502, and the third partition 43 and the body portion 11 of the outer shell 10 form an in-pile coolant flow cavity 431. In such embodiments, the heat exchange between the in-pile coolant and the inner shell 20 can be reduced through the second heat insulation cavity 502.

[0047] See Figure 1 and Figure 2 In some embodiments, the lower connecting portion is provided with an in-core coolant inlet 101, and the main body 11 is provided with an in-core coolant outlet 111. When the lower connecting portion is installed in a core vacancy of the reactor, the in-core coolant in the reactor can enter the in-core coolant flow chamber 431 through the in-core coolant inlet 101 and return to the reactor through the in-core coolant outlet 111. In such embodiments, by providing the in-core coolant flow chamber 431, the in-core coolant inlet 101, and the in-core coolant outlet 111, it is possible to avoid affecting the flow of the in-core coolant, thereby reducing the impact on the reactor. The in-core coolant can be liquid sodium.

[0048] See Figure 1 and Figure 3 In some embodiments, the loop irradiation test apparatus 100 may further include a regenerating shell 70, a fourth partition 44, and a fifth partition 45. The regenerating shell 70 is located radially inside the second partition 42, and the first coolant in the cooling rising channel 302 flows upward along the radial outer surface of the regenerating shell 70. The fourth partition 44 and the fifth partition 45 are located inside the regenerating shell 70, with the fourth partition 44 located radially outside the fifth partition 45. The fourth partition 44 and the regenerating shell 70 form a regenerating rising channel 401, and the fifth partition 45 forms a regenerating descending channel 402. The bottoms of the regenerating rising channel 401 and the regenerating descending channel 402 are connected to form a regenerating flow path 400. A third heat insulation cavity 503 is formed between the fourth partition 44 and the fifth partition 45. The second coolant outside the reactor flows through the regenerating descending channel 402 and then turns to enter the regenerating rising channel 401 to cool the first coolant in the cooling rising channel 302 that flows through the radial outer surface of the regenerating shell 70. In this embodiment, since the regenerating rising channel 401 and the cooling rising channel 302 are separated only by the regenerating shell 70, the heat exchange effect between the first coolant and the second coolant is improved. Simultaneously, by providing the third heat insulation cavity 503, the heat exchange between the second coolant in the regenerating rising channel 401 and the second coolant in the regenerating descending channel 402 can be reduced, which helps to ensure the cooling effect of the second coolant in the regenerating rising channel 401 on the first coolant and prevents the temperature of the first coolant flowing outside the reactor from becoming too high.

[0049] In some embodiments, gas can be introduced into the third insulation chamber 503 to maintain pressure; wherein the introduced gas can be an inert gas, such as argon. By setting the type and concentration of gas in the third insulation chamber 503, the thermal conductivity of the third insulation chamber 503 can also be adjusted.

[0050] See Figure 1 and Figure 3 In some embodiments, the loop-type irradiation test apparatus 100 may further include: a first cover 61, a second cover 62, a third cover 63, a fourth cover 64, and a fifth cover 65, which are respectively arranged from top to bottom in the space above the reactor top cover of the inner shell 20. A first sealed cavity 601 is formed between the first cover 61 and the second cover 62, the fifth partition 45 is connected to the second cover 62, and the regenerative descent channel 402 is connected to the first sealed cavity 601. The second coolant outside the reactor enters the first sealed cavity 601 and then enters the regenerative descent channel 402. A second sealed cavity 602 is formed between the second cover 62 and the third cover 63, the fourth partition 44 is connected to the third cover 63, and the third heat insulation cavity 503 is connected to the second sealed cavity 602 to allow gas to be introduced into the third heat insulation cavity 503 through the second sealed cavity 602. A third sealed cavity 603 is formed between the third cover 63 and the fourth cover 64. 3. The regenerating shell 70 is connected to the fourth cover 64, and the regenerating rising channel 401 is connected to the third sealing cavity 603. The second coolant in the regenerating rising channel 401 enters the third sealing cavity 603 and then flows out of the inner shell 20. A fourth sealing cavity 604 is formed between the fourth cover 64 and the fifth cover 65. The first partition 41 and the second partition 42 are connected to the fifth cover 65. The cooling rising channel 302 is connected to the fourth sealing cavity 604, and the first coolant in the cooling rising channel 302 enters the fourth sealing cavity 604 and then flows out of the inner shell 20. The fifth cover 65 is provided with an air inlet channel 651 for filling the first heat insulation cavity 501 with gas. In this embodiment, by cutting the inner shell 20 at the positions corresponding to different sealing cavities, the corresponding components can be extracted, disassembled, and replaced.

[0051] See Figure 1 and Figure 2 In some embodiments, the loop irradiation test apparatus 100 may further include an outer cover 120, which is sealed to the upper connecting portion 12, the third partition 43, and the inner shell 20 of the outer casing 10. The inner shell 20 extends upward through the outer cover 120 to above the reactor top cover, and the outer casing 10 and the third partition 43 are located below the outer cover 120. Coolant within the reactor vessel can flow into the in-reactor coolant flow chamber 431 between the outer casing 10 and the third partition 43. The outer cover 120 seals the top ends of the outer casing 10 and the third partition 43, thereby sealing the in-reactor coolant flow chamber 431. Furthermore, the outer cover 120 is used to enclose the second heat insulation chamber 502 formed between the third partition 43 and the inner shell 20.

[0052] The outer cover 120 can be welded to the third partition 43 and sealed to the upper connecting part 12 of the outer shell 10 by a sealing ring.

[0053] In some embodiments, the inner shell 20 can be disassembled together with the outer cover 120 and the third partition 43. In such embodiments, the irradiated sample 200 can be replaced and the irradiation test can be performed again.

[0054] The outer cover 120 is provided with an air inlet channel 121 for filling the second heat insulation cavity 502 with gas. In this embodiment, gas at a certain pressure is filled into the second heat insulation cavity 502; wherein the filled gas can be an inert gas, such as argon. By setting the type and concentration of gas in the second heat insulation cavity 502, the thermal conductivity of the second heat insulation cavity 502 can also be adjusted.

[0055] See Figure 1 and Figure 3 In some embodiments, the inner shell 20 may form a second coolant inlet 202, which is connected to the first sealing cavity 601 and the regenerative descending channel 402. The second coolant can first flow into the first sealing cavity 601 through the second coolant inlet 202, and then flow from the first sealing cavity 601 into the regenerative descending channel 402. The inner shell 20 may also form a second coolant outlet 204, which is connected to the third sealing cavity 603 and the regenerative rising channel 401. The second coolant in the regenerative rising channel 401 can first flow into the third sealing cavity 603, and then flow out of the inner shell 20 from the second coolant outlet 204.

[0056] See Figure 1 and Figure 3 In some embodiments, the inner shell 20 may also form an air inlet 205, which is connected to the second sealing cavity 602 and the third heat insulation cavity 503. Gas can be introduced into the third heat insulation cavity 503 through the air inlet 205.

[0057] See Figure 1 and Figure 3 In some embodiments, the inner shell 20 may form a first coolant inlet 201, which is located below the fifth cover 65. The first coolant inlet 201 communicates with the cooling descending channel 301 to allow the first coolant to flow into the cooling descending channel 301. The inner shell 20 may also form a first coolant outlet 203, which communicates with the fourth sealing cavity 604 and the cooling rising channel 302. The first coolant in the cooling rising channel 302 can first flow into the fourth sealing cavity 604 and then flow out of the inner shell 20 from the first coolant outlet 203.

[0058] In some embodiments, the first coolant inlet 201, the first coolant outlet 203, the second coolant inlet 202, and the second coolant outlet 204 are all connected to cooling equipment outside the reactor, so that the coolant provided by the cooling equipment outside the reactor can enter the loop irradiation test apparatus 100 and return to the outside of the reactor.

[0059] In some embodiments, the air intake channel 121, the air inlet 205, and the air intake channel 651 are all connected to an external gas source to fill the three heat insulation chambers with gas.

[0060] In some embodiments, the bottom wall of the inner shell 20 and the bottom wall of the regenerating shell 70 are both formed with flow guides to facilitate the coolant to reduce resistance and flow smoothly into another channel under the action of the flow guides.

[0061] See Figure 1 In some embodiments, the regenerative flow path 400 may be higher than the coolant level within the reactor. In such embodiments, sufficient space is provided for the irradiated sample 200, ensuring that the first coolant flowing through the irradiated sample 200 carries away the heat generated by the irradiated sample 200. In some embodiments, the lower portion of the regenerative flow path 400 may be located within the reactor.

[0062] See Figure 1 and Figure 2 In some embodiments, the loop-type irradiation test apparatus 100 may further include a melt collector 90 disposed in the second heat insulation chamber 502 to receive the melt from the irradiated sample 200 when it melts. In such embodiments, it is convenient to cool and recover the melt obtained after the irradiated sample 200 melts, thus avoiding impact on the reactor.

[0063] See Figure 1 and Figure 2 In some embodiments, a diversion column 91 is provided at the center of the melt collector 90, which can divert the melt of the irradiated sample 200, so that the melt is dispersed throughout the bottom of the melt collector 90, avoiding the accumulation of melt at the bottom center of the melt collector 90 to prevent recriticality, and also facilitating the cooling of the melt of the irradiated sample 200.

[0064] In some embodiments, to ensure that the melt collector 90 can adequately receive the melt from the irradiated sample 200, the melt collector 90 should be configured to have sufficient depth. In some embodiments, to prevent the high-temperature melt from damaging the melt collector 90, the melt collector 90 is made of a material that is more heat-resistant than the inner shell 20.

[0065] In some embodiments, a lateral support member may be provided between the outer shell 10 and the third partition 43. The lateral support member is welded to only one of the outer shell 10 and the third partition 43, and is used for positioning the outer shell 10 and the third partition 43 and for load transfer. Since the loop-type irradiation test device 100 is relatively long (approximately 15m in total length), it is prone to swaying during earthquakes, posing a safety hazard. Therefore, in such embodiments, by providing a lateral support member, the swaying of the loop-type irradiation test device 100 can be reduced, improving its safety. Similarly, in some embodiments, lateral support members may be provided between the third partition 43 and the inner shell 20, between the inner shell 20 and the first partition 41, and between the first partition 41 and the second partition 42.

[0066] In some embodiments, the diameter of the loop irradiation test apparatus 100 at its maximum point is approximately 160 mm.

[0067] The process of placing an irradiated sample 200 in the reactor core to conduct an irradiation test using the loop-type irradiation test apparatus 100 provided in the embodiments of this application is described below.

[0068] The irradiated sample 200 is assembled and sealed with the loop irradiation test apparatus 100. Then, the surface of the loop irradiation test apparatus 100 is cleaned to remove dust and impurities. Next, the loop irradiation test apparatus 100 is heated by introducing heating gas (such as argon) into the cooling and regenerating flow paths to prevent the first and second coolants added to the inner shell 20 and regenerating shell 70 from solidifying. Then, the lower connection of the irradiation test apparatus is inserted into the core cavity, and the upper connection 12 is connected to the top plug. Next, the external cooling equipment is connected to the corresponding coolant inlet and outlet, and the external gas source is connected to the inlet channel 121, inlet 205, and inlet channel 651. Then, the inner shell 20 is filled with the first coolant, the regenerating shell 70 is filled with the second coolant, and gas is introduced into the three insulation chambers. Once the conditions for the irradiation test are met, the irradiation test can be carried out.

[0069] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0070] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A loop-type irradiation test apparatus for a reactor, used to place irradiated samples in the reactor core for irradiation testing, characterized in that, The device includes: The outer casing includes a main body, an upper connecting part and a lower connecting part connected to the main body, the upper connecting part being used for installation on the reactor top cover, and the lower connecting part being used for installation in the reactor core vacancy. An inner shell is disposed inside the outer shell, and the irradiated sample is disposed in the inner shell; The inner shell forms a cooling flow path, through which a first coolant from outside the reactor can enter to cool the irradiated sample, and then return to the outside of the reactor. A regenerative flow path is also formed inside the inner shell, through which a second coolant outside the reactor can enter to cool the first coolant that has flowed through the irradiated sample in the cooling flow path, and then return to the outside of the reactor. The cooling flow path includes a cooling descending channel located on the radially outer side and a cooling ascending channel located on the radially inner side; The irradiated sample is located at the bottom of the cooling rising channel. The first coolant from the cooling falling channel enters the cooling rising channel and carries away the heat of the irradiated sample as it flows through it. A first heat insulation cavity is also formed inside the inner shell, which is located between the cooling descending channel and the cooling rising channel to reduce heat exchange between the first coolant in the cooling descending channel and the irradiated sample, as well as between the first coolant in the cooling rising channel and the irradiated sample.

2. The apparatus according to claim 1, characterized in that, Also includes: A first partition and a second partition are disposed within the inner shell, with the first partition disposed radially outward of the second partition; The upper end of the irradiation shell of the irradiated sample is connected to the lower end of the second partition, and the lower end of the irradiation shell of the irradiated sample is connected to the bottom end of the first partition. The first partition and the inner shell form the cooling descending channel, the second partition forms the cooling ascending channel, and the first partition, the second partition, and the irradiation shell of the irradiated sample form the first heat insulation cavity.

3. The apparatus according to claim 2, characterized in that, Also includes: A connector is disposed at the bottom of the second partition and is used to connect the second partition to the first partition.

4. The apparatus according to claim 2, characterized in that, Also includes: A third partition is disposed between the body of the outer shell and the inner shell. The third partition and the inner shell form a second heat insulation cavity, and the third partition and the body of the outer shell form an in-pile coolant flow cavity. The lower connecting part is provided with an in-core coolant inlet, and the main body is provided with an in-core coolant outlet. When the lower connecting part is installed in the core vacancy of the reactor, the in-core coolant in the reactor can enter the in-core coolant flow chamber through the in-core coolant inlet and return to the reactor through the in-core coolant outlet.

5. The apparatus according to claim 2, characterized in that, Also includes: A regenerating shell is disposed radially inside the second partition, and the first coolant in the cooling rising channel flows upward along the radial outer surface of the regenerating shell; The fourth and fifth partitions are disposed inside the regenerating shell, with the fourth partition disposed radially outside the fifth partition; The fourth partition and the regenerating shell form a regenerating rising channel, and the fifth partition forms a regenerating descending channel. The bottoms of the regenerating rising channel and the regenerating descending channel are connected to form the regenerating flow path. A third heat insulation cavity is formed between the fourth partition and the fifth partition; The second coolant outside the reactor flows through the regenerating descending channel into the regenerating ascending channel, cooling the first coolant flowing through the radial outer surface of the regenerating shell.

6. The apparatus according to claim 5, characterized in that, The upper connecting part is located at the top of the main body. When the lower connecting part of the outer shell is installed in the core cavity of the reactor and the upper connecting part of the outer shell is connected to the reactor top cover, the inner shell extends upward to above the reactor top cover. The device further includes: a first cover, a second cover, a third cover, a fourth cover, and a fifth cover, which are respectively arranged from top to bottom at intervals in the space above the stack top cover of the inner shell; A first sealed cavity is formed between the first cover and the second cover. The fifth partition is connected to the second cover. The regenerative descent channel is connected to the first sealed cavity. The second coolant outside the reactor enters the first sealed cavity and then enters the regenerative descent channel. A second sealing cavity is formed between the second cover and the third cover. The fourth partition is connected to the third cover. The third heat insulation cavity is connected to the second sealing cavity so that gas can be injected into the third heat insulation cavity through the second sealing cavity. A third sealing cavity is formed between the third cover and the fourth cover. The regenerating shell is connected to the fourth cover, and the regenerating rising channel communicates with the third sealing cavity. The second coolant in the regenerating rising channel enters the third sealing cavity and then flows out of the inner shell. A fourth sealing cavity is formed between the fourth cover and the fifth cover. The first partition and the second partition are connected to the fifth cover. The cooling rise channel communicates with the fourth sealing cavity. The first coolant in the cooling rise channel enters the fourth sealing cavity and then flows out of the inner shell. The fifth cover is provided with an air inlet channel for filling the first heat insulation cavity with gas.

7. The apparatus according to claim 1, characterized in that, The regenerative flow path is above the coolant level inside the reactor.

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