High-temperature neutron irradiation device

Abstract

The invention relates to a high-temperature neutron irradiation device, and belongs to the technical field of irradiation. The high-temperature neutron irradiation device comprises a plurality of irradiation containers, two heat insulation pieces and a shell. A cavity for accommodating an irradiation sample is formed in the irradiation container, and protruding pieces are arranged at the two ends of the irradiation container in the preset direction; the irradiation container is made of zirconium; the two heat insulation pieces are arranged at the two ends of the multiple irradiation containers in the preset direction respectively, and the heat insulation pieces are used for being arranged outside the protruding pieces of the multiple irradiation containers in a sleeving mode at the same time, so that the multiple irradiation containers are arranged in the circumferential direction in the preset direction, and the adjacent irradiation containers abut against each other; the two ends, in the preset direction, of the shell are detachably connected with end covers. The irradiation container and the heat insulation piece are both contained in the shell, and the end, away from the irradiation container, of the heat insulation piece is detachably connected with the corresponding end cover. The device can realize high-temperature irradiation and irradiation environments with high temperature in the shell and normal temperature outside the shell, samples placed in each irradiation container can be flexibly selected according to experimental requirements, and the applicability is high; the assembly is convenient and the structure is stable.

Description

Technical Field

[0001] This application relates to the field of irradiation technology, and in particular to a high-temperature neutron irradiation device. Background Technology

[0002] Irradiation testing of nuclear power materials is a crucial step in the research and development of these materials. The performance data obtained through irradiation testing is vital for analyzing and evaluating the radiation resistance of nuclear power materials, and it also provides strong support for establishing performance models of irradiated materials and assessing reactor safety. Irradiation testing of nuclear power materials requires the use of irradiation facilities.

[0003] With the continuous development of nuclear power materials, high-temperature irradiation environments are sometimes required when conducting irradiation tests in irradiation devices. However, some nuclear power materials (such as long strip-shaped thin nickel-based alloy samples) have low irradiation heat generation rates when irradiated, making it very difficult and not easy to maintain them at high temperatures for irradiation tests. Summary of the Invention

[0004] The purpose of this application is to provide a high-temperature neutron irradiation device that can achieve both high-temperature irradiation and irradiation environments with high temperature inside the shell and normal temperature outside the shell. The sample placed in each irradiation container can be flexibly selected according to experimental needs, making it highly adaptable. The entire device is easy to assemble and disassemble and has a stable structure.

[0005] This application provides a high-temperature neutron irradiation device, comprising: multiple irradiation containers, two heat insulation components, and a shell; each irradiation container has a cavity for accommodating irradiated samples, and each irradiation container has protrusions at both ends along a predetermined direction; the irradiation containers are made of zirconium; the two heat insulation components are respectively disposed at both ends of the multiple irradiation containers along the predetermined direction, and the heat insulation components are used to simultaneously fit over the protrusions of the multiple irradiation containers, so that the multiple irradiation containers are arranged circumferentially around the predetermined direction, and adjacent irradiation containers abut against each other; end caps are detachably connected to both ends of the shell along the predetermined direction; the irradiation containers and heat insulation components are both housed within the shell, and the end of each heat insulation component away from the irradiation container is detachably connected to the corresponding end cap.

[0006] The zirconium irradiation container for the high-temperature neutron irradiation device provided in this application features irradiation self-heating, solving the problem of low sample self-heating rate leading to difficulty in reaching high temperatures within the irradiation device. This design is suitable for high-temperature irradiation of long strips or thin sheet-like samples. The connection between the shell and the irradiation container via a heat insulation component resolves the significant temperature difference between the inside and outside of the shell, achieving a high-temperature irradiation environment inside the shell and a normal-temperature environment outside. Furthermore, by setting multiple irradiation containers, the irradiated sample placed in each container can be flexibly selected according to experimental needs. Different irradiation containers can also be marked as needed to distinguish different irradiated samples, demonstrating strong applicability. The protruding fitting design of the heat insulation component and multiple irradiation containers solves the positioning problem between the irradiation container and the heat insulation component. Multiple irradiation containers can be directly assembled together using the heat insulation component, resulting in a stable overall structure. Removing the heat insulation component automatically separates the multiple irradiation containers, making operation convenient.

[0007] In an optional embodiment of this application, the heat insulation component is made of zirconium oxide.

[0008] In the above technical solution, the heat insulation component is made of high-temperature resistant and heat-insulating zirconium oxide, which can achieve good heat insulation and effectively solve the problem of high temperature difference between the inside and outside of the shell, thereby better realizing the irradiation environment of high temperature inside the shell and normal temperature outside the shell.

[0009] In an optional embodiment of this application, when the heat insulation component is used to simultaneously cover the protrusions of multiple irradiation containers, the heat insulation component is simultaneously engaged with multiple protrusions.

[0010] The above technical solution makes it easy to assemble multiple irradiation containers together, and the overall structure after assembly is stable.

[0011] In an optional embodiment of this application, when the heat insulation component is used to simultaneously cover the protrusions of multiple irradiation containers, the multiple protrusions located at the same end in a preset direction are arranged circumferentially around the preset direction and together form an annular structure; the heat insulation component has a through hole penetrating the heat insulation component along the preset direction, and the annular structure is used to engage with the inner wall of the through hole of the corresponding heat insulation component.

[0012] The above technical solution makes it easy to assemble multiple irradiation containers together, and the overall structure after assembly is stable.

[0013] In an optional embodiment of this application, each end cap has a boss on its surface facing the heat insulation component, and the inner wall of the through hole at the end of the heat insulation component away from the irradiation container engages with the boss of the corresponding end cap.

[0014] The above technical solution makes it convenient to assemble the end cap and the heat insulation component together, and the overall structure after assembly is stable.

[0015] In an optional embodiment of this application, one end of the irradiation container along a predetermined direction has a cap, which is detachably connected to the substrate of the irradiation container and used to seal the cavity; a protrusion is provided on the surface of the cap away from the substrate.

[0016] The above technical solution facilitates the placement and removal of irradiated samples; and the sealing design prevents the irradiated samples from falling out when the irradiation device is inverted.

[0017] In an optional embodiment of this application, a limiting member is provided on the end face of the substrate facing the cover, and the limiting member has a limiting groove; the cover has a connecting part, which extends into the limiting groove and engages with the groove wall of the limiting groove.

[0018] In the above technical solution, the limiting groove of the limiting component and the connecting part of the cap can be engaged to make the sealing structure of the cap to the cavity stable and the cap disassembly and assembly operation convenient.

[0019] In an optional embodiment of this application, the substrate has two limiting members, which are respectively disposed on opposite sides of the substrate; the connecting part of the cap is used to extend into the limiting groove of the corresponding limiting member.

[0020] The above technical solution makes the encapsulation structure of the cavity more stable.

[0021] In an optional embodiment of this application, the end face of the substrate facing the cap has a groove, which communicates with the cavity; the irradiation container also has a limiting plug, one end of which is used to extend into the cavity and the other end is used to engage with the groove wall.

[0022] The above technical solution is suitable for small irradiation samples. It can limit the movement of small irradiation samples to prevent them from shaking inside the cavity and being damaged when the entire irradiation device is being picked up or placed, or when the irradiation device is inverted.

[0023] In an optional embodiment of this application, the number of irradiation containers is 4, and each irradiation container is a 1 / 4 cylindrical structure; when the 4 irradiation containers are arranged circumferentially around a preset direction, they form a cylindrical structure. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the external structure of the high-temperature neutron irradiation device provided in the embodiments of this application.

[0026] Figure 2 This is a schematic diagram of the internal structure of the high-temperature neutron irradiation device provided in the embodiments of this application.

[0027] Figure 3 This is a schematic diagram of the internal explosion of a high-temperature neutron irradiation device provided in an embodiment of this application.

[0028] Figure 4 An exploded schematic diagram of the irradiation container and heat insulation component provided in the embodiments of this application.

[0029] Figure 5 This is a schematic diagram of the structure of the irradiation container provided in an embodiment of this application.

[0030] Figure 6 This is an explosion diagram of an irradiation container provided in an embodiment of this application.

[0031] Figure 7 This is a cross-sectional schematic diagram of an irradiation container provided in an embodiment of this application.

[0032] Icons: 100-High-temperature neutron irradiation device; 101-Preset direction; 110-Irradiation container; 111-Protrusion; 112-Cap; 1121-Connecting part; 113-Base; 1131-Groove; 114-Limiting part; 1141-Limiting groove; 115-Limiting plug; 1151-Extension part; 1152-Snap-fit ​​part; 120-Heat insulation part; 121-Through hole; 130-Shell; 140-End cap; 141-Boss; 200-Irradiated sample. Detailed Implementation

[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments of this application, the technical terms "length", "upper", "lower", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "connection" and other such terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0039] This application provides an irradiation device. Figure 1 This is a schematic diagram of the external structure of the high-temperature neutron irradiation device provided in the embodiments of this application. Figure 2 This is a schematic diagram of the internal structure of the high-temperature neutron irradiation device provided in an embodiment of this application. Figure 3 For a schematic diagram of the internal explosion of the high-temperature neutron irradiation device provided in the embodiments of this application, please refer to... Figures 1 to 3 The high-temperature neutron irradiation device 100 includes: multiple irradiation containers 110, two heat insulation components 120, and a housing 130.

[0040] Each irradiation container 110 has a cavity for containing the irradiated sample, and each irradiation container 110 has protrusions 111 at both ends along a predetermined direction 101. The irradiation container 110 is made of zirconium.

[0041] Two heat insulation components 120 are respectively disposed at both ends of a plurality of irradiation containers 110 along a preset direction 101. The heat insulation components 120 are used to simultaneously fit over the protrusions 111 of the plurality of irradiation containers 110, so that the plurality of irradiation containers 110 are arranged circumferentially around the preset direction 101, and adjacent irradiation containers 110 abut against each other.

[0042] Both ends of the housing 130 along the preset direction 101 are detachably connected to end caps 140; the irradiation container 110 and the heat insulation component 120 are both used to be housed in the housing 130, and the end of each heat insulation component 120 away from the irradiation container 110 is detachably connected to the corresponding end cap 140.

[0043] The high-temperature neutron irradiation device 100 provided in this application uses a zirconium irradiation container 110 to solve the problem of the low self-heating rate of the sample, which makes it difficult to reach high temperatures inside the irradiation device. This makes it suitable for high-temperature irradiation of long strips or long strip-shaped sheets. The heat insulation component 120 connects the shell 130 and the irradiation container 110, solving the problem of a large temperature difference between the inside and outside of the shell 130, and achieving an irradiation environment with high temperature inside the shell 130 and room temperature outside the shell 130.

[0044] Furthermore, by setting up multiple irradiation containers 110, this application allows for flexible selection of the irradiation sample placed in each irradiation container 110 according to experimental needs. Different irradiation containers 110 can also be marked as needed to distinguish different irradiation samples, demonstrating strong applicability. The design of the heat insulation component 120 and the protruding parts 111 of the multiple irradiation containers 110 solves the positioning problem between the irradiation containers 110 and the heat insulation component 120. Multiple irradiation containers 110 can be assembled together by fitting the heat insulation component 120, resulting in a stable overall structure. Removing the heat insulation component 120 automatically separates the multiple irradiation containers 110, making operation convenient.

[0045] In some optional embodiments of this application, the heat insulation component 120 is made of zirconium oxide. In the above embodiments, the heat insulation component 120 is made of high-temperature resistant and heat-insulating zirconium oxide, which can achieve good heat insulation and effectively solve the problem of high temperature difference between the inside and outside of the shell 130, thereby better realizing the irradiation environment of high temperature inside the shell 130 and normal temperature outside the shell 130.

[0046] It should be noted that in other feasible embodiments of this application, the material of the heat insulation component 120 can also be other high-temperature resistant heat insulation materials.

[0047] In some optional embodiments of this application, when the heat insulation member 120 is simultaneously fitted over the protrusions 111 of multiple irradiation containers 110, the heat insulation member 120 simultaneously engages with the multiple protrusions 111. This method facilitates the assembly of multiple irradiation containers 110 together, and ensures a stable overall structure after assembly.

[0048] Further, please refer to Figure 3When the heat insulation component 120 is simultaneously fitted over the protrusions 111 of multiple irradiation containers 110, the multiple protrusions 111 located at the same end of the preset direction 101 are arranged circumferentially around the preset direction 101 and together form a ring structure. Correspondingly, the heat insulation component 120 has a through hole 121 penetrating the heat insulation component 120 along the preset direction 101, and the ring structure is used to engage with the inner wall of the through hole 121 of the corresponding heat insulation component 120. The above method makes it convenient to assemble multiple irradiation containers 110 together, and the overall structure after assembly is stable.

[0049] Furthermore, in this application, the annular structure formed by the circumferential arrangement of multiple protrusions 111 around the preset direction 101 is circular, and correspondingly, the through hole 121 of the heat insulation member 120 is a circular through hole.

[0050] It should be noted that in other feasible embodiments of this application, the annular structure formed by the circumferential arrangement of multiple protrusions 111 around the preset direction 101 can also be of other shapes, and the through hole 121 of the heat insulation member 120 can be of the corresponding shape.

[0051] As mentioned above, the end of each heat insulation component 120 away from the irradiation container 110 is detachably connected to the corresponding end cap 140. When the heat insulation component 120 has a through hole 121 that penetrates the heat insulation component 120 along a preset direction 101, in order to make it convenient to assemble the end cap 140 and the heat insulation component 120 together and to ensure the stability of the overall structure after assembly, a boss 141 is provided on the surface of each end cap 140 facing the heat insulation component 120. The inner wall of the through hole 121 at the end of the heat insulation component 120 away from the irradiation container 110 is engaged with the boss 141 of the corresponding end cap 140.

[0052] Furthermore, in this application, the through hole 121 of the heat insulation component 120 is a circular through hole, and correspondingly, the boss 141 on the surface of the end cap 140 is a cylindrical boss.

[0053] As an example, such as Figure 3 As shown, in this application, the heat insulation member 120 has a circular structure. It should be noted that in other optional embodiments of this application, the heat insulation member 120 may also have other shapes, as long as it can be simultaneously fitted over the protrusions 111 of multiple irradiation containers 110 so that the multiple irradiation containers 110 are arranged circumferentially around the preset direction 101 and adjacent irradiation containers 110 abut against each other.

[0054] As mentioned above, the irradiation container 110 is made of zirconium; in this application, the irradiation container 110 is a zirconium capsule.

[0055] Figure 4 For an exploded view of the irradiation container and heat insulation component provided in the embodiments of this application, please refer to [link / reference]. Figure 4In this application, the number of irradiation containers 110 in the high-temperature neutron irradiation device 100 is 4, and each irradiation container 110 is a 1 / 4 cylindrical structure; when the 4 irradiation containers 110 are arranged circumferentially around the preset direction 101, they together form a cylindrical structure.

[0056] It should be noted that this application does not specifically limit the number of irradiation containers 110, and the number of irradiation containers 110 can be set accordingly as needed; this application also does not limit the shape formed when multiple irradiation containers 110 are arranged circumferentially around the preset direction 101. For example, the shape formed when multiple irradiation containers 110 are arranged circumferentially around the preset direction 101 can also be a quadrangular prism structure, a hexagonal prism structure, etc.

[0057] Figure 5 This is a schematic diagram of the structure of the irradiation container provided in an embodiment of this application. Figure 6 For an explosion diagram of the irradiation container provided in the embodiments of this application, please refer to... Figure 5 and Figure 6 In some optional embodiments of this application, one end of the irradiation container 110 along a predetermined direction 101 has a cap 112. The cap 112 is detachably connected to the base 113 of the irradiation container 110 and is used to seal the cavity of the irradiation container 110. A protrusion 111 is provided on the surface of the cap 112 away from the base 113. The above method facilitates the placement and removal of the irradiated sample 200; and the cap 112 can prevent the irradiated sample 200 from falling out when the high-temperature neutron irradiation device 100 is inverted.

[0058] Furthermore, a limiting member 114 is provided on the end face of the substrate 113 facing the cover 112, and the limiting member 114 has a limiting groove 1141; the cover 112 has a connecting part 1121, which extends into the limiting groove 1141 and engages with the groove wall of the limiting groove 1141. In the above manner, by engaging the limiting groove 1141 of the limiting member 114 with the connecting part 1121 of the cover 112, the sealing structure of the cover 112 to the cavity can be made stable, and the disassembly and assembly of the cover 112 can be convenient.

[0059] Furthermore, the substrate 113 has two limiting members 114, respectively disposed on opposite sides of the substrate 113; the connecting portion 1121 of the cover 112 is respectively used to extend into the limiting groove 1141 of the corresponding limiting member 114. The above method can make the sealing structure of the cavity by the cover 112 more stable.

[0060] As an example, such as Figure 6 As shown, the limiting member 114 on the base 113 is a rectangular protrusion, the limiting groove 1141 is a rectangular through groove, and the connecting part 1121 of the cover 112 is stepped.

[0061] It should be noted that in other feasible embodiments of this application, the limiting member 114, the limiting groove 1141, and the connecting part 1121 may also be of other shapes.

[0062] In some optional implementations of this application, please refer to Figure 6 Each irradiation container 110 can have multiple cavities, and each cavity can hold an irradiated sample 200. The specific number can be selected according to the actual situation.

[0063] In some optional embodiments of this application, the cavity is cylindrical in shape. It should be noted that the shape of the cavity can also be selected according to the needs. For example, for long strip-shaped irradiated samples, the cavity is cylindrical with a large aspect ratio, and for small irradiated samples, the cavity can be cylindrical with a small aspect ratio and a small volume.

[0064] Figure 7 For a cross-sectional schematic diagram of the irradiation container provided in the embodiments of this application, please refer to [link / reference]. Figure 6 and Figure 7 To limit the movement of small irradiated samples placed inside the cavity, and to prevent damage to the samples caused by shaking within the cavity when the entire high-temperature neutron irradiation device 100 is being placed or removed, or when the high-temperature neutron irradiation device 100 is inverted; such as Figure 6 and Figure 7 As shown, the end face of the substrate 113 facing the cap 112 has a groove 1131, which communicates with the cavity; the irradiation container 110 also has a limiting plug 115, one end of which is used to extend into the cavity, and the other end of which is used to engage with the groove wall of the groove 1131. The space formed between the cavity and the limiting plug 115 is used to place the irradiated sample 200.

[0065] Furthermore, the groove 1131 is a cylindrical groove, and correspondingly, the part of the limiting plug 115 that engages with the groove 1131 is a cylindrical structure.

[0066] As an example, such as Figure 6 As shown, the limiting plug 115 is composed of an extension portion 1151 and a locking portion 1152 connected to each other. Both the extension portion 1151 and the locking portion 1152 are cylinders, and the diameter of the locking portion 1152 is larger than the diameter of the extension portion 1151.

[0067] Please refer to it again. Figure 1 In this application, the housing 130 is cylindrical. It should be noted that in other feasible embodiments of this application, the housing 130 may be designed in other shapes as needed.

[0068] In some optional embodiments of this application, both the housing 130 and the end cap 140 are made of aluminum.

[0069] In some optional embodiments of this application, the housing 130 and the end cap 140 are detachably connected or connected by welding.

[0070] In some optional embodiments of this application, the gap between the shell 130 and the irradiation container 110 can be designed accordingly as needed; the heat generation rate of the irradiated sample and structural materials is obtained through physical calculations, and the gap between the shell 130 and the irradiation container 110 is designed according to the heat generation rate.

[0071] In summary, the irradiation heating of the zirconium irradiation container for the high-temperature neutron irradiation device provided in this application solves the problem of the low self-heating rate of the sample, which makes it difficult to reach high temperatures inside the irradiation device. It is suitable for high-temperature irradiation of long strips or thin sheet-like samples. The connection between the shell and the irradiation container via a heat insulation component solves the problem of a large temperature difference between the inside and outside of the shell, achieving an irradiation environment with high temperature inside the shell and room temperature outside. Furthermore, by setting multiple irradiation containers, the irradiated sample placed in each container can be flexibly selected according to experimental needs. Different irradiation containers can also be marked as needed to distinguish different irradiated samples, making it highly adaptable. The design of the heat insulation component and the protruding parts of the multiple irradiation containers solves the positioning problem between the irradiation container and the heat insulation component; multiple irradiation containers can be assembled together by the heat insulation component, resulting in a stable overall structure; and the multiple irradiation containers automatically separate when the heat insulation component is removed, making operation convenient.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-temperature neutron irradiation device, characterized in that, include: Multiple irradiation containers, each having a cavity for containing irradiated samples, and each having protrusions at both ends along a predetermined direction; the irradiation containers are made of zirconium. Two heat insulation components are respectively disposed at both ends of the plurality of irradiation containers along the preset direction. The heat insulation components are used to simultaneously sleeve the protrusions of the plurality of irradiation containers so that the plurality of irradiation containers are arranged circumferentially around the preset direction and adjacent irradiation containers abut against each other. The housing has end caps detachably connected to both ends along the preset direction; the irradiation container and the heat insulation component are both housed within the housing, and the end of each heat insulation component away from the irradiation container is detachably connected to the corresponding end cap.

2. The high-temperature neutron irradiation device according to claim 1, characterized in that, The heat insulation component is made of zirconium oxide.

3. The high-temperature neutron irradiation device according to claim 1, characterized in that, When the heat insulation element is used to simultaneously be fitted over the protrusions of multiple irradiation containers, the heat insulation element is simultaneously engaged with multiple protrusions.

4. The high-temperature neutron irradiation device according to claim 3, characterized in that, When the heat insulation component is used to simultaneously cover the protrusions of multiple irradiation containers, the multiple protrusions located at the same end in the preset direction are arranged circumferentially around the preset direction and together form a ring structure. The heat insulation component has a through hole extending through the heat insulation component along the preset direction, and the annular structure is used to engage with the inner wall of the corresponding through hole of the heat insulation component.

5. The high-temperature neutron irradiation device according to claim 4, characterized in that, Each end cap has a boss on its surface facing the heat insulation member, and the inner wall of the through hole at the end of the heat insulation member away from the irradiation container engages with the boss of the corresponding end cap.

6. The high-temperature neutron irradiation device according to any one of claims 1 to 5, characterized in that, The irradiation container has a cap at one end along the preset direction. The cap is detachably connected to the base of the irradiation container and is used to close the cavity. The protrusion is disposed on the surface of the cap away from the base.

7. The high-temperature neutron irradiation device according to claim 6, characterized in that, A limiting member is provided on the end face of the substrate facing the cap, and the limiting member has a limiting groove; The cap has a connecting part that extends into the limiting groove and engages with the groove wall.

8. The high-temperature neutron irradiation device according to claim 7, characterized in that, The base has two limiting members, which are respectively disposed on opposite sides of the base; the connecting part of the cover is used to extend into the limiting groove of the corresponding limiting member.

9. The high-temperature neutron irradiation device according to claim 6, characterized in that, The substrate has a groove on the end face facing the cap, and the groove communicates with the cavity; The irradiation container also has a limiting plug, one end of which is used to extend into the cavity and the other end is used to engage with the groove wall of the groove.

10. The high-temperature neutron irradiation device according to any one of claims 1 to 5, characterized in that, The number of irradiation containers is 4, and each irradiation container is a 1 / 4 cylindrical structure; when the 4 irradiation containers are arranged circumferentially around the preset direction, they form a cylindrical structure.

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