Loop type irradiation test device for reactor

Abstract

The embodiment of the invention relates to the technical field of nuclear reactor testing, in particular to a loop type irradiation test device for a reactor, which is used for placing an irradiation sample in a reactor core of the reactor for an irradiation test. The device comprises a shell, the shell comprises a body part, an upper connecting part and a lower connecting part, the upper connecting part and the lower connecting part are connected with the body part, the upper connecting part is used for being installed on a reactor top cover of a reactor, and the lower connecting part is used for being installed in a reactor core vacancy of the reactor; the inner shell is arranged in the outer shell, and the irradiation sample is arranged in the inner shell; a cooling flow path is formed in the inner shell, and 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. According to the loop type irradiation test device provided by the embodiment of the invention, a large amount of heat does not enter the reactor basically, and the influence on the reactor is small; the cooling effect of the coolant on the irradiation sample can be controlled, it can be guaranteed that the temperature of the coolant outlet is not too high, and the design difficulty of equipment outside the device is lowered.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of nuclear reactor testing, and in particular to a loop-type irradiation test device for a reactor. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The fuel materials and structural materials in the reactor will be irradiated during service, causing their performance to change, which in turn affects the safe and stable operation of the reactor. Therefore, it is necessary to study the performance changes of fuel materials and structural materials after irradiation.

[0004] In order to study the performance changes of fuel materials and structural materials after irradiation, irradiated samples made of fuel or structural materials are usually placed in irradiation containers, and then the irradiation containers are placed in reactors for irradiation tests to study the performance changes of materials after irradiation. However, since the irradiated samples (especially when the samples are irradiated components) will generate heat during the irradiation test, this heat will enter the reactor and have a certain impact on the reactor. Summary of the invention

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

[0006] In the related art, the heat generated by the irradiated sample during the irradiation test is completely carried away by the in-core coolant in the reactor. This heat will follow the in-core coolant into the reactor and have a certain impact on the reactor. Especially when the irradiated sample is a fuel assembly, the fuel assembly releases more heat during the test, which has a greater impact on the reactor.

[0007] In view of the above problems, an embodiment of the present application provides a loop-type irradiation test device for a reactor, which is used to place an irradiated sample in the core of the reactor for irradiation testing.

[0008] The loop type irradiation test device provided in the embodiment of the present application comprises an outer shell and an inner shell. The outer shell comprises a main body, an upper connecting part and a lower connecting part connected to the main body, the upper connecting part is used to be installed on the reactor top cover of the reactor, and the lower connecting part is used to be installed on the core vacancy of the reactor; the inner shell is arranged inside the outer shell, and the irradiated sample is arranged in the inner shell; wherein a cooling flow path is formed inside the inner shell, and the 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 device provided in the embodiment of the present application can utilize the first coolant outside the reactor to cool the irradiated sample. The cooled first coolant can return to the outside of the reactor, and there is an insulating cavity between the first coolant and the coolant inside the reactor so that basically no large amount of heat enters the reactor, and the impact on the reactor is small; 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 accurately controlled by adjusting the inlet temperature and flow rate of the first coolant; in addition, a heat recovery flow path is provided to allow the first coolant to exchange heat with the second coolant outside the reactor before flowing out of the irradiation device, thereby ensuring that the outlet temperature of the first coolant is not too high, thereby reducing the difficulty of designing equipment outside the device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0011] Figure 1 It is a structural schematic diagram of a loop-type irradiation test device for a reactor provided in an embodiment of the present application.

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

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

[0014] Description of reference numerals:

[0015] 100. Loop type irradiation test device;

[0016] 10. Shell; 11. Main body; 111. Coolant outlet for the stack; 12. Upper connecting part; 120. Outer cover; 121. Air inlet passage; 101. Coolant inlet for the stack;

[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 ascending channel;

[0019] 41, first partition; 42, second partition; 43, third partition; 44, fourth partition; 45, fifth partition; 431, in-stack coolant flow cavity; 400, heat recovery flow path; 401, heat recovery ascending channel; 402, heat recovery descending channel;

[0020] 501, first insulation cavity; 502, second insulation cavity; 503, third insulation cavity;

[0021] 61, first cover; 62, second cover; 63, third cover; 64, fourth cover; 65, fifth cover; 651, air inlet passage; 601, first sealed cavity; 602, second sealed cavity; 603, third sealed cavity; 604, fourth sealed cavity;

[0022] 70. Heat recovery shell;

[0023] 80. Connectors;

[0024] 90. Melt collecting part; 91. Diverter column;

[0025] 200. Irradiating the sample; 210. Irradiating the shell.

[0026] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0027] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0028] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0029] An embodiment of the present application provides a loop-type irradiation test device for a reactor, which is used to place an irradiation sample in the core of the reactor for irradiation testing.

[0030] See also Figure 1 The loop type irradiation test device 100 provided in the embodiment of the present 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 and a lower connecting part connected to the main body 11, the upper connecting part 12 is used to be installed on the reactor top cover of the reactor, and the lower connecting part is used to be installed in the core vacancy of the reactor; the inner shell 20 is arranged inside the outer shell 10, and the irradiated sample 200 can be arranged in the inner shell 20; wherein, a cooling flow path 300 is formed inside the inner shell 20, and the 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 device 100 provided in the embodiment of the present application can utilize the first coolant outside the reactor (i.e., outside the reactor vessel of the reactor) to cool the irradiated sample 200. The cooled first coolant can return to the outside of the reactor, and there is an insulating cavity between the first coolant and the coolant inside the reactor so that basically no large amount of heat enters the reactor vessel of the reactor, and the impact on the reactor is small. 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 accurately controlled by adjusting the inlet temperature and flow rate of the first coolant. In addition, a heat recovery flow path 400 is provided to allow the first coolant to exchange heat with the second coolant outside the reactor before flowing out of the irradiation device, thereby ensuring that the temperature of the first coolant outlet 203 is not too high, thereby reducing the difficulty of designing equipment outside the device.

[0032] In the related art, when the irradiated sample is a fuel assembly, it can only be irradiated in the coolant in the reactor vessel. The temperature of the irradiation test also depends on the temperature of the coolant in the reactor vessel, and the irradiation test conditions are single.

[0033] The embodiment of the present application cools the irradiated sample 200 by introducing a first coolant outside the reactor. By changing the type of the first coolant and the 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 in the reactor vessel. The loop irradiation test device 100 provided in the embodiment of the present application provides an inclusive environment for the irradiated sample 200 in the reactor, isolating different test environment media from the coolant in the reactor vessel, and enriching the irradiation test conditions.

[0034] The loop type irradiation test device 100 provided in the embodiment of the present application is installed in the core of the reactor through the upper connecting part 12 and the lower connecting part, so that the irradiation sample 200 is installed in the core of the reactor for irradiation test, which is easy 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 includes a plurality of fuel elements assembled together.

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

[0038] In some embodiments, the structure of the lower connecting portion may be the same as the structure of the connecting portion of the core assembly for inserting into the core vacant space. During installation, the lower connecting portion may be directly inserted into the core vacant space of the grid header of the core.

[0039] In some embodiments, a heat recovery flow path 400 may also be formed in the inner shell 20, and the second coolant outside the reactor can enter the heat recovery flow path 400 to cool the first coolant in the cooling flow path 300 after passing through the irradiated sample 200, and then return to the outside of the reactor. In such an embodiment, the second coolant outside the reactor can be used to take away the heat of the cooling flow path 300, reduce the temperature of the first coolant in the cooling flow path 300 after heat exchange with the irradiated sample 200, and reduce the difficulty of designing the equipment outside the device. The second coolant is, for example, liquid sodium.

[0040] See also Figure 1 In some embodiments, the cooling flow path 300 may include a cooling down channel 301 located on the radial outer side and a cooling up channel 302 located on the radial inner side; wherein the irradiated sample 200 is located at the bottom of the cooling up channel 302, and the first coolant from the cooling down channel 301 enters the cooling up channel 302, and takes away the heat of the irradiated sample 200 when flowing through the irradiated sample 200. In such an embodiment, the temperature of the first coolant from the cooling down channel 301 is relatively low, and the first coolant with a relatively low temperature flows downward to enter the cooling up channel 302, exchanges heat with the irradiated sample 200, and the first coolant with a higher temperature flows upward along the cooling up channel 302 to leave the reactor. Since the cooling down channel 301 is located on the radial outer side, the cooling up channel 302 is located on the radial inner side, and the irradiated sample 200 is located at the bottom of the cooling up channel 302, the cooling down channel 301 located on the radial outer side can be used to separate the irradiated sample 200 from the coolant in the reactor, thereby reducing the heat transfer of the irradiated sample 200 to the reactor.

[0041] See also Figure 1 and Figure 2 In some embodiments, a first heat-insulating cavity 501 may be formed in the inner shell 20, and is disposed between the cooling descending channel 301 and the cooling ascending channel 302, so as to reduce the heat exchange between the first coolant in the cooling descending channel 301 and the irradiated sample 200 and the first coolant in the cooling ascending channel 302, thereby ensuring that the temperature of the first coolant with a relatively low temperature (e.g., 300°C) can be kept at a relatively low temperature when not flowing through the irradiated sample 200, thereby ensuring the cooling effect on the irradiated sample 200. In addition, in such an embodiment, by controlling the temperature and flow rate of the first coolant inlet 201, the heat of the irradiation container brought out by the first coolant in the cooling descending channel 301 is reduced, so that the temperature of the first coolant at the upper end outlet of the irradiated sample 200 can be increased. When the irradiated sample 200 is a fuel assembly, the working condition that the outlet of the fuel assembly is at a higher temperature (e.g., 900°C) can be simulated, and this temperature is much higher than the outlet temperature of the irradiated sample when the irradiation test is performed on the irradiated sample 200 using the reactor internal coolant.

[0042] In some embodiments, gas may be filled into the first insulation cavity 501 and a certain pressure may be maintained. The gas filled into the first insulation cavity 501 may be an inert gas, such as argon. By setting the type and concentration of the gas in the first insulation cavity 501, the thermal conductivity of the first insulation cavity 501 may be adjusted to control the heat exchange between 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 also Figure 1 and Figure 2In some embodiments, the loop type irradiation test device 100 may further include a first partition 41 and a second partition 42. The first partition 41 and the second partition 42 are arranged in the inner shell 20, and the first partition 41 is arranged radially outside 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; wherein 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 and the second partition 42, and the irradiation shell 210 of the irradiated sample 200 form a first heat insulation cavity 501. In such an embodiment, a cooling ascending channel 302 and a cooling descending channel 301 are formed in the inner shell 20 by providing the first partition 41 and the second partition 42, which is beneficial for the first coolant to flow in the inner shell 20 and for the first coolant to cool the irradiated sample 200; at the same time, a first heat-insulating cavity 501 can be formed by the first partition 41, the second partition 42 and the irradiation shell 210 of the irradiated sample 200 to reduce 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.

[0044] See also Figure 1 and Figure 2 In some embodiments, the loop type irradiation test device 100 may further include a connector 80, which is disposed at the bottom of the second partition 42 and is used to connect the second partition 42 with the first partition 41. Since the first partition 41 and the second partition 42 are relatively long, the connector 80 can prevent the first partition 41 and the second partition 42 from radially shaking, which is conducive to ensuring the stability of the flow of the first coolant. In such an embodiment, 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 irradiation sample 200 is connected to the lower end of the second partition 42 , disposing the connecting member 80 at the bottom of the second partition 42 is also beneficial to improving the stability of the irradiation sample 200 .

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

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

[0048] See also Figure 1 and Figure 3 In some embodiments, the loop-type irradiation test device 100 may further include a heat recovery shell 70 , a fourth partition 44 and a fifth partition 45 . The heat recovery shell 70 is arranged on the radial inner side of the second partition 42, and the first coolant in the cooling ascending channel 302 flows upward along the radial outer surface of the heat recovery shell 70; the fourth partition 44 and the fifth partition 45 are arranged inside the heat recovery shell 70, and the fourth partition 44 is arranged on the radial outer side of the fifth partition 45; wherein, the fourth partition 44 and the heat recovery shell 70 form a heat recovery ascending channel 401, and the fifth partition 45 forms a heat recovery descending channel 402, and the bottoms of the heat recovery ascending channel 401 and the heat recovery descending channel 402 are connected to form a heat recovery flow path 400; a third insulation cavity 503 is formed between the fourth partition 44 and the fifth partition 45; the second coolant outside the reactor flows through the heat recovery descending channel 402 and then turns to enter the heat recovery ascending channel 401, so as to cool the first coolant in the cooling ascending channel 302 flowing through the radial outer surface of the heat recovery shell 70. In such an embodiment, since the heat recovery ascending channel 401 and the cooling ascending channel 302 are separated only by the heat recovery shell 70, it is beneficial to improve the heat exchange effect between the first coolant and the second coolant. At the same time, by providing the third heat insulation cavity 503, the heat exchange between the second coolant in the heat recovery ascending channel 401 and the second coolant in the heat recovery descending channel 402 can be reduced, which is beneficial to ensure the cooling effect of the second coolant in the heat recovery ascending channel 401 on the first coolant, and avoid the first coolant flowing to the outside of the reactor from being too high in temperature.

[0049] In some embodiments, gas may be filled into the third insulation cavity 503 to maintain pressure; the gas filled may be an inert gas, such as argon. The thermal conductivity of the third insulation cavity 503 may also be adjusted by setting the gas type and gas concentration in the third insulation cavity 503.

[0050] See also Figure 1 and Figure 3 In some embodiments, the loop-type irradiation test device 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 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, the heat recovery descending channel 402 is communicated with the first sealed cavity 601, and the second coolant outside the reactor enters the first sealed cavity 601 and then enters the heat recovery descending 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 insulation cavity 503 is communicated with the second sealed cavity 602, so that gas can be filled into the third insulation cavity 503 through the second sealed cavity 602; a third sealed cavity 60 is formed between the third cover 63 and the fourth cover 64. 3. The heat recovery shell 70 is connected to the fourth cover 64, and the heat recovery rising channel 401 is connected to the third sealed cavity 603; the second coolant in the heat recovery rising channel 401 enters the third sealed cavity 603 and then flows out of the inner shell 20; the fourth sealed 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 sealed cavity 604, and the first coolant in the cooling rising channel 302 enters the fourth sealed 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 such an embodiment, by cutting the inner shell 20 at the position corresponding to different sealed cavities, the corresponding components can be extracted, disassembled, and replaced.

[0051] See also Figure 1 and Figure 2 In some embodiments, the loop type irradiation test device 100 may further include an outer cover 120, which is sealed with the upper connection portion 12 of the outer shell 10, the third partition 43, and the inner shell 20. The inner shell 20 extends upward through the outer cover 120 to the top of the reactor top cover, and the outer shell 10 and the third partition 43 are located below the outer cover 120. The coolant in the reactor container can flow into the in-stack coolant flow cavity 431 between the outer shell 10 and the third partition 43. The outer cover 120 seals the top of the outer shell 10 and the third partition 43, thereby sealing the in-stack coolant flow cavity 431. In addition, the outer cover 120 is used to close the second heat insulation cavity 502 formed between the third partition 43 and the inner shell 20.

[0052] The outer cover 120 can be welded to the third partition portion 43 and sealed to the upper connecting portion 12 of the housing 10 via 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 an embodiment, the irradiation 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 gas into the second insulation cavity 502. In such an embodiment, by filling the second insulation cavity 502 with gas of a certain pressure, wherein the filled gas may be an inert gas, such as argon. By setting the gas type and gas concentration in the second insulation cavity 502, the thermal conductivity of the second insulation cavity 502 can also be adjusted.

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

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

[0057] See also Figure 1 and Figure 3 In some embodiments, the inner shell 20 may form a first coolant inlet 201, which is below the fifth cover 65. The first coolant inlet 201 is connected to the cooling descending channel 301, so that the first coolant flows into the cooling descending channel 301; the inner shell 20 may also form a first coolant outlet 203, which is connected to the fourth sealed cavity 604 and the cooling ascending channel 302, and the first coolant in the cooling ascending channel 302 can first flow into the fourth sealed 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 the cooling equipment outside the reactor, so that the coolant provided by the cooling equipment outside the reactor can enter the loop irradiation test device 100 and return to the outside of the reactor.

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

[0060] In some embodiments, the bottom wall of the inner shell 20 and the bottom wall of the heat recovery shell 70 both form guide portions, so as to help the coolant reduce resistance under the action of the guide portions and flow smoothly into another channel.

[0061] See also Figure 1 In some embodiments, the heat recovery flow path 400 may be higher than the liquid level of the coolant in the reactor. In such an embodiment, sufficient space can be provided for the irradiated sample 200 and the first coolant flowing through the irradiated sample 200 can be ensured to take away the heat generated by the irradiated sample 200. In some embodiments, the lower part of the heat recovery flow path 400 may be located in the reactor.

[0062] See also Figure 1 and Figure 2 In some embodiments, the loop type irradiation test device 100 may further include a melt collecting member 90, which is disposed in the second heat insulation chamber 502 to receive the melt of the irradiated sample 200 when the irradiated sample 200 melts. In such an embodiment, the melt obtained after the irradiated sample 200 melts is easily cooled and recycled to avoid affecting the reactor.

[0063] See also Figure 1 and Figure 2 In some embodiments, a diverter column 91 is provided at the center of the melt collecting piece 90, which can divert the melt of the irradiated sample 200 so that the melt is dispersed over the entire bottom of the melt collecting piece 90, thereby preventing the melt from accumulating at the bottom center of the melt collecting piece 90 to prevent re-criticality, and also facilitating the cooling of the melt of the irradiated sample 200.

[0064] In some embodiments, the melt collecting member 90 should be configured to have a sufficient depth to ensure that the melt collecting member 90 can fully receive the melt of the irradiated sample 200. In some embodiments, the melt collecting member 90 is made of a material that is more resistant to high temperatures than the inner shell 20 to prevent the melt collecting member 90 from being damaged by the high temperature melt.

[0065] In some embodiments, a lateral support member may be provided between the outer shell 10 and the third partition 43, and the lateral support member is welded to only one of the outer shell 10 and the third partition 43, and is used to position the outer shell 10 and the third partition 43 and transfer load. Since the loop-type irradiation test device 100 is relatively long (the total length is about 15m), the loop-type irradiation test device 100 is prone to shaking when an earthquake occurs, which poses a safety hazard. Therefore, in such an embodiment, by providing a lateral support member, the shaking of the loop-type irradiation test device 100 can be reduced, thereby improving the safety of the loop-type irradiation test device 100. Similarly, in some embodiments, a lateral support member 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 maximum diameter of the loop-type irradiation test device 100 is about 160 mm.

[0067] The following describes a process of placing an irradiated sample 200 in a core of a reactor to carry out an irradiation test using the loop-type irradiation test device 100 provided in an embodiment of the present application.

[0068] Assemble and seal the irradiated sample 200 and the loop-type irradiation test device 100; then, clean the surface of the loop-type irradiation test device 100 to remove dust and impurities; then, heat the loop-type irradiation test device 100 by introducing heating gas (such as argon) into the cooling flow path and the heat recovery flow path to prevent the first coolant and the second coolant added to the inner shell 20 and the heat recovery shell 70 from solidifying; then, insert the lower connecting part of the irradiation test device into the core vacancy, and connect the upper connecting part 12 to the top of the stack plug; then, connect the external cooling equipment to the corresponding coolant inlet and outlet, and connect the external gas source to the air inlet channel 121, the air inlet 205 and the air inlet channel 651; then, fill the first coolant into the inner shell 20, fill the second coolant into the heat recovery shell 70, and fill the three insulation cavities with gas; the irradiation test can be carried out after the conditions for the irradiation test are met.

[0069] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0070] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A loop type irradiation test device for a reactor, used to place an irradiated sample in the core of a reactor for irradiation testing, characterized in that: The device comprises: A shell, the shell comprising a body, an upper connecting portion and a lower connecting portion connected to the body, the upper connecting portion being used to be installed on a reactor top cover of the reactor, and the lower connecting portion being used to be installed in a core vacancy of the reactor; An inner shell, arranged inside the outer shell, and the irradiated sample is arranged in the inner shell; A cooling flow path is formed in the inner shell, and the 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.

2. The device according to claim 1, characterized in that A heat recovery flow path is also formed in the inner shell, and the second coolant outside the reactor can enter the heat recovery flow path to cool the first coolant in the cooling flow path after flowing through the irradiated sample, and then return to the outside of the reactor.

3. The device according to claim 2, characterized in that The cooling flow path includes a cooling descending channel located on the radial outside and a cooling ascending channel located on the radial inside; The irradiated sample is located at the bottom of the cooling ascending channel, and the first coolant from the cooling descending channel enters the cooling ascending channel and takes away the heat of the irradiated sample when flowing through the irradiated sample.

4. The device according to claim 3, characterized in that A first heat-insulating cavity is also formed in the inner shell and is disposed between the cooling descending channel and the cooling ascending channel to reduce heat exchange between the first coolant in the cooling descending channel and the irradiated sample and between the first coolant in the cooling ascending channel and the first coolant in the cooling ascending channel.

5. The device according to claim 4, characterized in that Also includes: A first partition and a second partition are arranged in the inner shell, wherein the first partition is arranged radially outside 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 thermal insulation cavity.

6. The device according to claim 5, characterized in that Also includes: A connecting member is arranged at the bottom of the second partition and is used to connect the second partition and the first partition.

7. The device according to claim 5, characterized in that Also includes: a third partition, disposed between the main body of the outer shell and the inner shell, the third partition and the inner shell forming a second heat-insulating cavity, and the third partition and the main body of the outer shell forming an in-stack coolant flow cavity; The lower connecting part is provided with an in-stack coolant inlet, and the main body is provided with an in-stack coolant outlet. When the lower connecting part is installed in the empty space of the reactor core, the in-stack coolant in the reactor can enter the in-stack coolant flow cavity through the in-stack coolant inlet and return to the reactor through the in-stack coolant outlet.

8. The device according to claim 5, characterized in that Also includes: A heat recovery shell is arranged on the radial inner side of the second partition, and the first coolant in the cooling ascending channel flows upward along the radial outer surface of the heat recovery shell; A fourth partition and a fifth partition are arranged inside the heat recovery shell, and the fourth partition is arranged radially outside the fifth partition; The fourth partition and the heat recovery shell form a heat recovery ascending channel, the fifth partition forms a heat recovery descending channel, and the bottoms of the heat recovery ascending channel and the heat recovery descending channel are connected to form the heat recovery flow path; A third heat-insulating cavity is formed between the fourth partition and the fifth partition; The second coolant outside the reactor flows through the heat recovery descending channel and enters the heat recovery ascending channel to cool the first coolant flowing through the radial outer surface of the heat recovery shell.

9. The device according to claim 8, characterized in that The upper connecting portion is arranged at the top end of the main body portion, When the lower connection portion of the outer shell is installed in the core vacancy of the reactor and the upper connection portion of the outer shell is connected to the reactor top cover of the reactor, the inner shell extends upward to above the reactor top cover; The device further comprises: 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 where the inner shell is located above the stack top cover; A first sealed cavity is formed between the first cover and the second cover, the fifth partition is connected to the second cover, the heat recovery descending channel is communicated with the first sealed cavity, and the second coolant outside the reactor enters the first sealed cavity and then enters the heat recovery descending channel; A second sealed cavity is formed between the second cover and the third cover, the fourth partition is connected to the third cover, and the third heat-insulating cavity is communicated with the second sealed cavity, so that gas can be filled into the third heat-insulating cavity through the second sealed cavity; A third sealed cavity is formed between the third cover and the fourth cover, the heat recovery shell is connected to the fourth cover, and the heat recovery ascending channel is connected to the third sealed cavity; the second coolant in the heat recovery ascending channel enters the third sealed cavity and then flows out of the inner shell; A fourth sealed 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 ascending channel is communicated with the fourth sealed cavity, and the first coolant in the cooling ascending channel enters the fourth sealed 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.

10. The device according to claim 2, characterized in that The heat recovery flow path is higher than the liquid level of the coolant in the reactor.

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