Irradiation test device for reactor

Abstract

The embodiment of the invention relates to the technical field of nuclear reactor testing, in particular to an irradiation test device for a reactor, which comprises an outer shell and an inner shell. The shell comprises a body part, a first connecting part and a second connecting part, the first connecting part and the second connecting part are connected with the body part, the first connecting part is mounted on a reactor top cover of a reactor, and the second connecting part is mounted 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; wherein a test coolant is contained in the inner shell, and the test coolant forms a cooling loop in the inner shell, so that the test coolant is used for cooling the irradiation sample. According to the embodiment of the invention, the test coolant forms the cooling loop in the inner shell, and the irradiation sample can be placed in various different coolants (namely test environment media) for irradiation test by changing the variety of the test coolant without being limited to coolants in a reactor, so that the irradiation test conditions are enriched.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of nuclear reactor testing, and in particular to an 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] During service, the materials in the reactor will be irradiated by the reactor core, which will cause changes in their performance, thus affecting the safe and stable operation of the reactor. Therefore, it is necessary to study the performance changes of the materials after irradiation.

[0004] In order to study the performance changes of materials after irradiation, irradiated samples made of 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. At present, the structure of irradiation equipment limits the irradiation test conditions for irradiated samples. 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, 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.

[0007] In view of the above problems, an embodiment of the present application provides an 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 irradiation test device provided in the embodiment of the present application includes an outer shell and an inner shell. The outer shell includes a main body, a first connection part connected to the main body, and a second connection part, the first connection part is used to be installed on the reactor top cover of the reactor, and the second connection part is used to be installed on the core vacancy of the reactor; the inner shell is arranged inside the outer shell, and the irradiation sample is arranged in the inner shell; wherein the inner shell contains a test coolant, and the test coolant forms a cooling circuit in the inner shell, so as to use the test coolant to cool the irradiation sample.

[0009] The embodiments of the present application form a cooling circuit in the inner shell with the test coolant. By changing the type of the test coolant, the irradiated sample can be placed in a variety of coolants (i.e., test environment media) for irradiation testing, and is not limited to the coolant in the reactor. By changing the flow rate of the test coolant, the temperature of the irradiated sample can be changed, thereby performing irradiation tests at different temperatures. The irradiation test device provided in the embodiments of the present application provides a containment environment for the irradiated sample in the reactor, isolates different test environment media from the coolant in the reactor, and enriches the irradiation test conditions. 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 schematic structural diagram of an 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 irradiation test device is shown.

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

[0014] Description of reference numerals:

[0015] 100. Irradiation test equipment;

[0016] 10. Shell; 11. Main body; 110. Coolant outlet for the stack; 111. First pipe; 112. First cover; 12. First connection; 13. Second connection; 130. Coolant inlet for the stack;

[0017] 20. Inner shell; 21. Second pipe; 22. Second cover; 23. Sample connection part; 24. Cooling circuit; 241. Ascending channel; 242. Descending channel;

[0018] 30. First partition; 31. Inner pipe; 32. Outer pipe; 33. End cover; 301. Insulation cavity;

[0019] 40. driving unit; 41. impeller; 411. liquid suction port; 412. liquid discharge port;

[0020] 50, charging pipeline; 60, second partition; 601, in-pile coolant flow cavity; 602, heat conduction cavity;

[0021] 70. Melt collecting part; 71. Diverter column;

[0022] 81. first connecting member; 82. second connecting member; 90. impurity removal device;

[0023] 200. Stack cover; 300. Irradiated samples.

[0024] 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

[0025] 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.

[0026] 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.

[0027] An embodiment of the present application provides an irradiation test device for a reactor, which is used to place an irradiation sample in a core of a reactor for irradiation testing.

[0028] See also Figure 1 , the 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 body portion 11, a first connection portion 12 and a second connection portion 13 connected to the body portion 11, the first connection portion 12 is used to be installed on the reactor top cover 200 of the reactor, and the second connection portion 13 is used to be installed on the core vacancy of the reactor; the inner shell 20 is arranged inside the outer shell 10, and the irradiation sample 300 is arranged in the inner shell 20; wherein the inner shell 20 contains a test coolant, and the test coolant forms a cooling circuit 24 in the inner shell 20, so as to cool the irradiation sample 300 using the test coolant.

[0029] The embodiment of the present application forms a cooling circuit 24 in the inner shell with the test coolant. By changing the type of the test coolant, the irradiated sample 300 can be placed in various coolants (i.e., test environment media) for irradiation testing, and is not limited to the coolant in the reactor. By changing the flow rate of the test coolant, the temperature of the irradiated sample 300 can be changed, so that the irradiation test can be performed at different temperatures. The irradiation test device 100 provided in the embodiment of the present application provides an inclusive environment for the irradiated sample 300 in the reactor, isolates different test environment media from the coolant in the reactor, and enriches the irradiation test conditions.

[0030] The irradiation test device 100 provided in the embodiment of the present application is installed in the core of the reactor through the first connection part 12 and the second connection part 13, so that the irradiation sample 300 is installed in the core of the reactor for irradiation test, which is easy to operate.

[0031] In some embodiments, the test coolant may be liquid sodium.

[0032] In some embodiments, the irradiated sample 300 may be a fuel assembly, wherein the fuel assembly includes a plurality of fuel elements assembled together.

[0033] In some embodiments, the stack cover 200 may be a plug on the reactor top. During installation, the first connection portion 12 may penetrate the plug on the reactor top and be connected to the plug on the reactor top through a flange and bolts.

[0034] In some embodiments, the structure of the second connection portion 13 may be the same as the structure of the connection portion of the core assembly for inserting into a core vacancy.

[0035] See also Figure 1 , Figure 2 and Figure 3In some embodiments, the irradiation test device 100 may further include a first partition 30 and a driving unit 40. The first partition 30 may be disposed in the inner shell 20 to separate the inner shell 20 into an ascending channel 241 located on the radial inner side and a descending channel 242 located on the radial outer side, and the descending channel 242 is in fluid communication with the bottom of the ascending channel 241; the driving unit 40 may be disposed in the outer shell 10 to drive the test coolant in the inner shell 20 to flow upward along the ascending channel 241 to enter the descending channel 242, and to make the test coolant in the descending channel 242 flow downward to enter the ascending channel 241 to form a cooling circuit 24 to cool the irradiated sample 300. In such an embodiment, after the test coolant with a lower temperature flows downward to enter the descending channel 242, it enters the ascending channel 241 to exchange heat with the irradiated sample 300, and the test coolant with a higher temperature flows upward along the ascending channel 241 to circulate into the descending channel 242. Since the descending channel 242 is located radially outward, it is beneficial for the heat of the test coolant in the descending channel 242 to diffuse outward to the coolant in the reactor, thereby ultimately diffusing the heat generated by the irradiated sample 300 during the irradiation test into the coolant in the reactor, thereby cooling the irradiated sample 300.

[0036] In some embodiments, the driving unit 40 is, for example, a pump.

[0037] See also Figure 1 and Figure 2 In some embodiments, the first partition 30 is configured to form an insulating cavity 301. In some embodiments, the irradiation test device 100 may further include an air filling pipeline 50, which is disposed on the housing 10 and is used to fill gas into the insulating cavity 301 to insulate the descending channel 242 and the ascending channel 241. In such an embodiment, by insulating the descending channel 242 and the ascending channel 241, it is possible to avoid heat exchange between the test coolant in the ascending channel 241 and the test coolant in the descending channel 242, so that there is a certain temperature difference between the test coolant in the ascending channel 241 and the test coolant in the descending channel 242, which is conducive to the test coolant in the descending channel 242 entering the ascending channel 241 to take away the heat of the irradiated sample 300, thereby cooling the irradiated sample 300.

[0038] In addition, it is ensured that the temperature of the relatively low test coolant in the descending channel 242 can be maintained at the preset test temperature when not flowing through the irradiated sample 300, thereby simulating the irradiation test of placing the irradiated sample 300 in a specific coolant at a specific temperature. In addition, in such an embodiment, since the heat of the irradiated sample 300 is not taken out in advance by the test coolant in the descending channel 242, the temperature of the test coolant at the upper end outlet of the irradiated sample 300 can be increased. When the irradiated sample 300 is a fuel assembly, it is possible to simulate not only the irradiation test at the normal operating temperature of the reactor, but also the operating condition where the fuel assembly outlet is at a higher temperature, for example, the instantaneous high temperature operating condition of the reactor. After the test is completed, the fuel assembly can be taken out in time and sent to the hot chamber for analysis.

[0039] See also Figure 1 and Figure 3 In some embodiments, the body 11 may include a first tube 111 and a first cover 112. The upper end of the first tube 111 is open, and the first cover 112 is detachably connected to the first tube 111 to seal the upper end of the first tube 111.

[0040] The first connection portion 12 is connected to the upper middle portion of the first pipe member 111 , and the second connection portion 13 is connected to the first pipe member 111 below the first pipe member 111 .

[0041] In some embodiments, the gas filling pipeline 50 may be disposed in the first pipe 111. In some embodiments, the gas filled into the heat insulation cavity 301 by the gas filling pipeline 50 may be an inert gas, such as helium. The gas filling pipeline 50 may enter the first pipe 111 from the portion of the first pipe 111 located above the first connecting portion 12.

[0042] See also Figure 1 and Figure 2 In some embodiments, the first partition 30 may include an inner pipe 31, an outer pipe 32 arranged radially outside the inner pipe 31, and two end covers 33 connecting the inner pipe 31 and the outer pipe 32 at the top and bottom ends respectively. The inner pipe 31, the outer pipe 32 and the end covers 33 together form an insulation cavity 301.

[0043] See also Figure 1 and Figure 3 In some embodiments, the driving unit 40 may include an impeller 41, which has a liquid suction port 411 located radially inside and a liquid outlet 412 located radially outside, so as to draw the test coolant on the radial inside to the radial outside; the liquid suction port 411 of the impeller 41 is in fluid communication with the ascending channel 241, and the liquid outlet 412 is in fluid communication with the descending channel 242. In such an embodiment, the test coolant is driven to circulate in the ascending channel 241 and the cooling channel by the impeller 41, which is conducive to accelerating the cooling of the irradiated sample 300.

[0044] In such an embodiment, the flow rate of the test coolant in the cooling circuit 24 can be adjusted by adjusting the rotation speed of the impeller 41 , thereby adjusting the cooling effect on the irradiated sample 300 .

[0045] In some embodiments, the irradiation test device 100 may further include a heating element, which is disposed in the heat-insulating cavity 301 and is used to heat the first partition 30. In such an embodiment, before filling the test coolant into the inner shell 20, the first partition 30 and the inner shell 20 can be heated by the heating element to prevent the test coolant in the inner shell 20 from solidifying; and during the irradiation test, the test coolant in the inner shell 20 can also be heated by the heating element, so that the test coolant in the inner shell 20 is at different temperatures to simulate the irradiation test of the irradiated sample 300 in the coolant at different temperatures. Since the heating element is in the heat-insulating cavity 301 and is separated from the test coolant, the heating element is not easily damaged and is easy to replace.

[0046] The heating element may be, for example, an electric heating element. The heating element is in the heat-insulating cavity 301, which makes it easier to arrange cables. In some embodiments, the test coolant in the inner shell 20 may be at different temperatures by adjusting the electric heating power of the heating element, thereby performing irradiation tests on the irradiation sample 300 at different temperatures.

[0047] See also Figure 1 and Figure 2 In some embodiments, the irradiation test device 100 may further include a second partition 60, which is disposed between the inner shell 20 and the body 11 of the outer shell 10, and the second partition 60 and the inner shell 20 form a heat conduction cavity 602, and the second partition 60 and the body 11 of the outer shell 10 form an in-stack coolant flow cavity 601. In such an embodiment, the heat of the test coolant in the descending channel 242 can be transferred to the in-stack coolant flow cavity 601 through the heat conduction cavity 602, so that the heat of the irradiated sample 300 is taken away by the coolant in the stack container.

[0048] See also Figure 1 In some embodiments, the gas charging pipeline 50 is also used to charge the heat transfer cavity 602 with gas to adjust the thermal conductivity in the heat transfer cavity 602. In such an embodiment, the heat exchange between the in-core coolant and the inner shell 20 can be adjusted by adjusting the thermal conductivity in the heat transfer cavity 602, thereby changing the temperature of the test coolant in the inner shell 20. Specifically, the thermal conductivity in the heat transfer cavity 602 can be adjusted by adjusting the gas pressure and gas composition in the heat transfer cavity 602.

[0049] See also Figure 1In some embodiments, the second connection part 13 is provided with an in-core coolant inlet 130, and the main body 11 is provided with an in-core coolant outlet 110. When the second connection part 13 is installed in the empty space of the reactor core, the in-core coolant in the reactor can enter the in-core coolant flow cavity 601 through the in-core coolant inlet 130, cool the inner shell 20, and then return to the reactor through the in-core coolant outlet 110. In such an embodiment, the coolant entering the ascending channel 241 brings the heat of the irradiated sample 300 to the descending channel 242, and then the in-core coolant takes away the heat of the irradiated sample 300 carried by the coolant in the descending channel 242, thereby cooling the irradiated sample 300.

[0050] Specifically, since the irradiated sample 300 will generate heat during the irradiation test, the test coolant entering the ascending channel 241 will carry the heat of the irradiated sample 300 to the descending channel 242 after exchanging heat with the irradiated sample 300; at the same time, since the in-pile coolant enters the in-pile coolant flow cavity 601, it will exchange heat with the descending channel 242 through the heat conduction cavity 602, so the in-pile coolant will exchange heat with the test coolant in the descending channel 242, thereby enabling the in-pile coolant to take away the heat of the irradiated sample 300.

[0051] In some embodiments, the in-pile coolant may be liquid sodium.

[0052] In some embodiments, the thermal conductivity of the gas in the heat-conducting cavity 602 is greater than the thermal conductivity of the gas in the heat-insulating cavity 301. For example, the pressure of the gas in the heat-conducting cavity 602 is greater than the pressure of the gas in the heat-insulating cavity 301.

[0053] See also Figure 1 and Figure 3 In some embodiments, the irradiation test device 100 may further include a first connecting member 81, and the second partition 60 and the inner shell 20 may be connected to the outer shell 10 through the first connecting member 81. In some embodiments, the first connecting member 81 may be annular.

[0054] In some embodiments, the driving part 40 may be mounted on the second partition 60. In some embodiments, the top end of the second partition 60 may be flush with the top end of the inner shell 20, and both are located above the stack top cover 200.

[0055] See also Figure 1 In some embodiments, the top of the first partition 30 is higher than the in-pile coolant outlet 110. In such an embodiment, the heat exchange area between the in-pile coolant and the test coolant can be increased, which is beneficial for the in-pile coolant to take away the heat of the irradiated sample 300.

[0056] See also Figure 1 and Figure 2 In some embodiments, the irradiation test device 100 may further include a melt collector 70, which is disposed in the heat conduction cavity 602 to receive the melt of the irradiated sample 300 when the irradiated sample 300 melts. In such an embodiment, the melt collector 70 receives the melt of the irradiated sample 300, which facilitates the recovery of the melt obtained after the irradiated sample 300 is melted.

[0057] Specifically, the melt collecting member 70 is disposed in the second partition 60. The second partition 60 may include a partition tube with an opening at the lower end and a bottom cover for closing the opening at the lower end of the partition tube. The melt collecting member 70 may contact the lower end of the partition tube and the bottom cover.

[0058] join Figure 1 and Figure 2 In some embodiments, a diverter column 71 is provided at the center of the melt collecting piece 70, which can divert the melt of the irradiated sample 300 so that the melt is dispersed at the bottom of the melt collecting piece 70, avoiding the melt from accumulating at the bottom center of the melt collecting piece 70, which is beneficial to the cooling of the melt of the irradiated sample 300.

[0059] In some embodiments, the melt collecting member 70 should be configured to have a sufficient depth to ensure that the melt collecting member 70 can fully receive the melt of the irradiated sample 300. In some embodiments, the melt collecting member 70 is made of a material that is more resistant to high temperatures than the second partition 60 to prevent the melt collecting member 70 from being damaged by the high temperature melt.

[0060] See also Figure 1 and Figure 3 In some embodiments, the irradiation test device 100 may further include a decontamination device 90, which is disposed radially inward of the first partition 30 and is used to remove impurities from the test coolant. In such an embodiment, the test coolant is decontaminated by the decontamination device 90 to ensure the purity of the test coolant, thereby facilitating the quality of the test coolant and improving the safety of the irradiation test device 100.

[0061] In some embodiments, the impurity removal device 90 is, for example, a stainless steel filter. The stainless steel filter removes impurities by filtering the test coolant. In some embodiments, the impurity removal device 90 can be used to remove impurity oxygen and impurity carbon in the test coolant.

[0062] In some embodiments, the impurity removal device 90 is capable of filtering the test coolant at a relatively high temperature, such as a temperature greater than 500°C.

[0063] See also Figure 1 and Figure 2In some embodiments, the irradiation test device 100 may further include a sample connection portion 23, which is disposed on the inner shell 20 and is used to connect with the irradiation sample 300. In such an embodiment, by connecting the sample connection portion 23 with the irradiation sample 300, the irradiation sample 300 can be positioned in the inner shell 20 to prevent the irradiation sample 300 from shaking radially.

[0064] In some embodiments, the sample connection part 23 may form a connection hole to connect with the irradiated sample 300. The irradiated sample 300 has a connector adapted to the connection hole of the sample connection part 23, so that the irradiated sample 300 is installed on the sample connection part 23 by plugging the connector into the connection hole.

[0065] In some embodiments, the structure of the sample connection portion 23 may be the same as the structure of the core vacancy of the reactor.

[0066] join Figure 1 and Figure 2 In some embodiments, the inner shell 20 may include a second tube 21 and a second cover 22, and the second cover 22 is connected to an end of the second tube 21 away from the first cover 112. In some embodiments, the sample connection portion 23 may be disposed on the second cover 22.

[0067] See also Figure 1 and Figure 3 In some embodiments, the irradiation test device 100 may further include a second connector 82 for connecting the second partition 60 to the first tube 111. In some embodiments, the second connector 82 may connect the second partition 60 to the middle of the first tube 111.

[0068] In some embodiments, the irradiation test device 100 may further include a temperature measuring element, etc., which may be used to measure the temperature of the test coolant after flowing through the irradiated sample 300. In some embodiments, the temperature measuring element or other measuring element may be disposed in the heat conducting cavity 602 or the heat insulating cavity 301.

[0069] In some embodiments, the maximum diameter of the irradiation test device 100 is 160 mm, and the total height is 15 m.

[0070] The following describes a process of placing the irradiated sample 300 in the core of a reactor to carry out an irradiation test using the irradiation test device 100 provided in an embodiment of the present application.

[0071] First, connect the irradiated sample 300 to the sample connection part 23 so that the irradiated sample 300 can be set in the inner shell 20; then, assemble and seal the irradiation test device 100; then, clean the surface of the irradiation test device 100 to remove dust and impurities; then, preheat the inner shell 20 to 200℃~300℃ to prevent the test coolant added to the inner shell 20 from solidifying; then, fill the test coolant into the inner shell 20; then, insert the second connection part 13 of the irradiation test device into the empty space in the core, and connect the first connection part 12 to the top plug of the core to complete the placement of the irradiated sample 300 in the core of the reactor, and then the irradiation test can be carried out.

[0072] 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.

[0073] 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. An 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, a first connection part and a second connection part connected to the body, the first connection part being used to be installed on a reactor top cover of the reactor, and the second connection part 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; The inner shell contains a test coolant, and the test coolant forms a cooling circuit in the inner shell so as to cool the irradiated sample using the test coolant.

2. The device according to claim 1, characterized in that Also includes: A first partition, disposed in the inner shell, divides the inner shell into an ascending channel located radially inward and a descending channel located radially outward, wherein the descending channel is in fluid communication with the bottom of the ascending channel; The driving part is arranged in the outer shell, and is used to drive the test coolant in the inner shell to flow upward along the ascending channel to enter the descending channel, and to make the test coolant in the descending channel flow downward to enter the ascending channel to form the cooling circuit to cool the irradiated sample.

3. The device according to claim 2, characterized in that The first partition is configured to form an insulating cavity; The device also includes: An air filling pipeline is arranged on the shell and is used for filling gas into the heat insulation cavity to insulate the descending channel and the ascending channel.

4. The device according to claim 3, characterized in that The driving part includes: an impeller having a liquid suction port located at a radially inner side and a liquid discharge port located at a radially outer side, so as to draw the test coolant at a radially inner side to a radially outer side; The liquid suction port of the impeller is in fluid communication with the ascending channel, and the liquid discharge port is in fluid communication with the descending channel.

5. The device according to claim 3, characterized in that Also includes: A heating element is arranged in the heat-insulating cavity and is used for heating the first partition.

6. The device according to claim 3, characterized in that Also includes: a second partition, disposed between the inner shell and the main body of the outer shell, the second partition and the inner shell forming a heat conduction cavity, and the second partition and the main body of the outer shell forming an in-stack coolant flow cavity; The gas charging pipeline is also used to charge gas into the heat transfer cavity to adjust the thermal conductivity in the heat transfer cavity; The second connecting part is provided with an in-stack coolant inlet, and the main body is provided with an in-stack coolant outlet. When the second 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, cool the inner shell, and then return to the reactor through the in-stack coolant outlet.

7. The device according to claim 6, characterized in that The top of the first partition is higher than the in-stack coolant outlet.

8. The device according to claim 6, characterized in that Also includes: The melt collecting member is arranged in the heat conducting cavity to receive the melt of the irradiated sample when the irradiated sample melts.

9. The device according to claim 2, characterized in that Also includes: The impurity removal device is arranged on the radial inner side of the first partition and is used for removing impurities from the test coolant.

10. The device according to claim 1, characterized in that Also includes: The sample connecting portion is arranged on the inner shell and is used for connecting with the irradiated sample.

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