Beryllium sleeve, core assembly and research reactor irradiation test device

Abstract

The application belongs to the technical field of nuclear engineering, and particularly relates to a beryllium sleeve, a core assembly and a research reactor irradiation test device. The beryllium sleeve comprises a support, a beryllium block, a first fixing block and a second fixing block. The support has a core channel suitable for the passage of neutrons. The beryllium block is sleeved on the support, and a plurality of beryllium blocks are arranged adjacently in the extension direction of the core channel. The first fixing block cooperates with the support and the beryllium block. The second fixing block cooperates with the support and the beryllium block. In the extension direction of the core channel, the first fixing block and the second fixing block are respectively located on the two sides of the beryllium block. The beryllium sleeve provided by the application has strong structural stability and high reliability. When the beryllium sleeve is applied to the research reactor irradiation test device in combination with the core assembly, the neutrons can be effectively reflected to slow down the number attenuation of the neutrons, and the neutron economy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear engineering, in particular to a beryllium sleeve, a core assembly and a research reactor irradiation test device. BACKGROUND

[0002] The research reactor is a nuclear reactor for research, development, education and training. The neutrons produced by the research reactor can be used for research in the fields of materials, chemistry, isotopes and medicine. Therefore, the research reactor is an important means for developing atomic energy technology. Beryllium material has weak neutron adsorption capacity and strong reflection capacity. The beryllium block made of beryllium material provides a core passage for the irradiation test device, which can effectively slow down the decay of the number of neutrons and improve the economy of neutrons. The beryllium block is made by powder metallurgy process and is prone to brittle fracture. The beryllium material itself cannot form a reliable and stable structure. SUMMARY

[0003] The present application provides a beryllium sleeve, a core assembly and a research reactor irradiation test device. The core passage is provided by the support member, and the beryllium block is arranged on the support member to enclose the core passage. The beryllium block reflects neutrons to slow down the decay of the number of neutrons, avoiding the use of beryllium material components to provide the core passage, and the overall structure is stable and reliable.

[0004] The present application is implemented by the following technical solutions:

[0005] In a first aspect, the present application provides a beryllium sleeve for a research reactor irradiation test device to provide a core passage, comprising:

[0006] a support member, the support member having a core passage suitable for neutrons to pass through;

[0007] a beryllium block, the beryllium block being sleeved on the support member, and a plurality of the beryllium blocks being arranged adjacent to each other in the extension direction of the core passage;

[0008] a first fixing block, the first fixing block cooperating with the support member and cooperating with the beryllium block;

[0009] a second fixing block, the second fixing block cooperating with the support member and cooperating with the beryllium block, wherein the first fixing block and the second fixing block are respectively located on both sides of the beryllium block in the extension direction of the core passage.

[0010] In some optional embodiments, the first fixing block and the second fixing block are respectively sleeved on the support member.

[0011] In some optional embodiments, the first fixing block and the second fixing block are respectively engaged with the beryllium block.

[0012] In some optional embodiments, a water flow hole is formed on each of the beryllium block, the first fixed block and the second fixed block, the water flow holes of adjacent beryllium blocks are communicated, the water flow hole of the first fixed block is communicated with the water flow hole of the adjacent beryllium block, and the water flow hole of the second fixed block is communicated with the water flow hole of the adjacent beryllium block.

[0013] In some optional embodiments, the beryllium sleeve further comprises a flow blocking plug, the flow blocking plug has a first abutting surface, the flow blocking plug is abutted with the support through the first abutting surface to keep relative fixation with the support, and the flow blocking plug is located on one side of the second fixed block in the extension direction of the core channel.

[0014] In some optional embodiments, the beryllium block has a non-circular profile shape in the cross section of the core channel.

[0015] In some optional embodiments, the beryllium block has a polygonal profile shape in the cross section of the core channel.

[0016] In some optional embodiments, the support is provided with a lifting interface at one end in the extension direction, the lifting interface is suitable for cooperating with a lifting device.

[0017] In some optional embodiments, the beryllium sleeve further comprises a positioning pin, the positioning pin has a second abutting surface, the positioning pin is abutted with the support through the second abutting surface to keep relative fixation with the support, and the positioning pin is located on one side of the first fixed block in the extension direction of the core channel.

[0018] In the second aspect, the application provides a core assembly, which is used for cooperating with any one of the beryllium sleeves in the first aspect, the core assembly has a cooperating cavity, the cooperating cavity has an inner wall which is suitable for the shape of the beryllium block, and a gap is formed between the beryllium block and the inner wall.

[0019] In the third aspect, the application provides a research reactor core irradiation test device, which comprises any one of the beryllium sleeves in the first aspect and the core assembly in the second aspect.

[0020] Compared with the prior art, the application has the following advantages and beneficial effects:

[0021] 1. The beryllium sleeve provided by the application can provide stable support for the whole beryllium sleeve through the support, ensure the reliability and stability of the whole structure, and after the multiple beryllium blocks are matched on the support, the beryllium blocks can form a closed form on the core channel of the support, so that the beryllium blocks can reflect the neutrons in the core channel, and the number attenuation of the neutrons after passing through the core channel is slowed down; the first fixed block and the second fixed block can improve the structural stability between the beryllium blocks and the support, thereby further ensuring the stability and reliability of the whole structure of the beryllium sleeve, and further ensuring the slowing down effect of the number attenuation of the neutrons after passing through the core channel.

[0022] 2. The core assembly provided by the application can form a water gap with the beryllium sleeve after cooperating with the beryllium sleeve provided by the application, so that the cooling medium can cool the beryllium sleeve in the water gap, avoiding excessive thermal stress from affecting the beryllium blocks.

[0023] 3. The research reactor irradiation test device provided by the application provides a core channel for neutrons by using the core assembly and the beryllium sleeve provided by the application, the number attenuation of the neutrons after passing through the core channel is slowed down, and the economy of the neutrons is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the example embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 The beryllium sleeve structure schematic diagram provided by the embodiment of the application;

[0026] Figure 2 The beryllium sleeve and the core assembly cooperation structure schematic diagram in the research reactor irradiation test device provided by the embodiment of the application.

[0027] Markings in the drawings and corresponding names of parts:

[0028] 1 - support, 2 - first fixed block, 3 - hoisting interface, 4 - beryllium block, 5 - second fixed block, 6 - choke plug, 7 - positioning pin, 8 - water flow hole, 9 - beryllium sleeve, 10 - water gap, 11 - core assembly. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the application more clear and obvious, the following will further illustrate the application by combining with the embodiments and drawings, the illustrative embodiments of the application and the description thereof are only used to explain the application, and should not be regarded as a limitation on the application.

[0030] In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details. In other instances, well-known structures, circuits, materials or the like have not been described in order to avoid obscuring the present application.

[0031] Reference throughout this specification to "one embodiment", "an embodiment", "one example", or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the application. Thus, the appearances of the phrases "in one embodiment", "in an embodiment", "in one example", or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics can be combined in any suitable

[0032] In the description of the present application, the terms "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal", "high", "low", "inner", "outer", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0033] In the description of the present application, the terms "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal", "high", "low", "inner", "outer", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. Figure 1 The beryllium sleeve for the reactor irradiation test device to provide a core channel can include a support member 1, a beryllium block 4, a first fixed block 2 and a second fixed block 5.

[0034] The support member 1 serves as a support member of the beryllium sleeve on the one hand, and provides a core channel for neutrons on the other hand, that is, a core channel is formed on the support member 1 for neutrons to pass through. The overall shape of the support member 1 can not be limited, for example, square, prismatic, circular truncated cone, cylindrical, etc. Considering space saving and easy processing and manufacturing, the overall shape of the support member 1 can be set as cylindrical; the cross-sectional shape of the core channel can not be limited, and in actual implementation, the cross-sectional shape of the core channel can be set as circular, that is, the overall structure of the support member 1 can be circular tube.

[0035] The beryllium block 4 is sleeved on the support member 1, that is, when the overall structure of the support member 1 is in a circular tube shape, a matching hole is formed on the beryllium block 4 and is adapted to the outer diameter of the support member 1, and the beryllium block 4 is sleeved on the outer wall of the support member 1 through the matching hole, wherein the beryllium block 4 and the support member 1 form a transition fit, and in actual implementation, the hole wall of the matching hole of the beryllium block 4 is as close as possible to the outer wall of the support member 1, which can ensure the stability of the beryllium block 4 in the radial direction of the support member 1, and the beryllium block 4 has a large contact area with the support member 1, which is beneficial to heat dissipation of the beryllium block 4; the overall shape of the beryllium sleeve can not be limited, but considering that the beryllium sleeve finally needs to be matched with the core assembly 11, in order to ensure the convenience of implementation in the matching process, the cross-sectional shape of the beryllium sleeve is the same everywhere. In the extension direction of the core channel, a plurality of beryllium blocks 4 are arranged adjacent to each other, that is, in the axial direction of the support member 1, a plurality of beryllium blocks 4 are arranged adjacent to each other to realize full coverage of the core channel in the axial direction of the support member 1; meanwhile, a plurality of beryllium blocks 4 are used to realize coverage in the axial direction of the support member 1, and the length of each beryllium block 4 in the axial direction of the support member 1 is shorter, which is easy to process and form and is not prone to brittle fracture, so that the structural stability of the entire beryllium sleeve can be further guaranteed.

[0036] The first fixed block 2 mainly serves as one of the limiting members of the beryllium block 4 in the axial direction of the support member 1, and the first fixed block 2 is matched with the support member 1 to enable the first fixed block 2 to form a relatively fixed state with the support member 1, the first fixed block 2 is located at one end in the axial direction of the support member 1, and the first fixed block 2 is matched with the beryllium block 4 close to the one end in the axial direction, so that the first fixed block 2 and the beryllium block 4 form a relatively fixed state in the circumferential direction of the support member 1.

[0037] The second fixed block 5 mainly serves as the other limiting member of the beryllium block 4 in the axial direction of the support member 1, and the second fixed block 5 is matched with the support member 1 to enable the second fixed block 5 to form a relatively fixed state with the support member 1, the second fixed block 5 is located at the other end in the axial direction of the support member 1, and the second fixed block 5 is matched with the beryllium block 4 close to the other end in the axial direction, so that the second fixed block 5 and the beryllium block 4 form a relatively fixed state in the circumferential direction of the support member 1.

[0038] Compared with the way of directly processing and manufacturing the beryllium material member into the core channel member commonly used in the art, since the beryllium material member is made by a powder metallurgy process, brittle fracture is prone to occur, and therefore the longer beryllium material member also makes the stability and reliability of the overall structure lower. The beryllium sleeve provided by the embodiment of the application uses the support piece 1 to support the overall structure, the beryllium sleeve as a whole has certain structural stability and reliability, and a plurality of beryllium blocks 4 are provided outside the support piece 1 to surround the core channel to effectively reflect neutrons, the length of the single beryllium block 4 is reduced, the beryllium block 4 is not prone to brittle fracture, and the structural stability of the beryllium block 4 and the support piece 1 can be improved through the arrangement of the first fixing block 2 and the second fixing block 5, thereby further ensuring the stability and reliability of the overall structure of the beryllium sleeve.

[0039] The matching mode of the first fixing block 2 and the second fixing block 5 with the support piece 1 can not be limited, as long as the relative fixing between the first fixing block 2 and the support piece 1 and the relative fixing between the second fixing block 5 and the support piece 1 can be achieved, for example, in actual implementation, the detachable connection between the first fixing block 2, the second fixing block 5 and the support piece 1 can be usually achieved by bolts.

[0040] In some optional embodiments, the first fixing block 2 and the second fixing block 5 are respectively sleeved on the support piece 1. That is, when the support piece 1 is configured in a circular tube shape, the first fixing block 2 and the second fixing block 5 are respectively provided with matching holes which are adapted to the outer diameter of the support piece 1, and the first fixing block 2 and the second fixing block 5 form a transition fit with the support piece 1 through the respective matching holes, so that the first fixing block 2 and the second fixing block 5 have a larger contact area with the support piece 1, and the first fixing block 2 and the second fixing block 5 can improve the structural stability of the support piece 1 to a certain extent.

[0041] In actual implementation, in the axial direction of the support piece 1, the contour shadow of the beryllium block 4 can completely coincide with the contour shadow of the first fixing block 2 and the second fixing block 5, thereby facilitating the assembly work of the beryllium sleeve and the core assembly, that is, the hole type for the beryllium sleeve to pass through on the core assembly can be configured as a straight hole.

[0042] In some optional embodiments, the first fixing block 2 and the second fixing block 5 are respectively engaged with the beryllium block 4. After the first fixing block 2 and the second fixing block 5 are connected with the beryllium block 4 in the engagement mode, the separation of the first fixing block 2, the second fixing block 5 and the beryllium block 4 can be facilitated, thereby facilitating the disassembly work of the beryllium block 4, especially in the remote disassembly work process, the engagement mode can greatly improve the separation efficiency, thereby improving the disassembly efficiency.

[0043] In some optional embodiments, when the number of beryllium blocks 4 is two, the two beryllium blocks 4 can not be connected, and the two beryllium blocks 4 are arranged by end face lamination. When the number of beryllium blocks 4 is more than three, the two adjacent beryllium blocks 4 can be connected by meshing, so as to realize the limiting of the first fixed block 2 and the second fixed block 5 on the beryllium blocks 4 in the circumferential direction of the core channel.

[0044] In the embodiments of the present application, the meshing can be realized by tooth meshing structure.

[0045] In some optional embodiments, the beryllium block 4, the first fixed block 2 and the second fixed block 5 are respectively provided with water flow holes 8, the water flow holes 8 of the adjacent beryllium blocks 4 are communicated, the water flow hole 8 of the first fixed block 2 is communicated with the water flow hole 8 of the adjacent beryllium block 4, and the water flow hole 8 of the second fixed block 5 is communicated with the water flow hole 8 of the adjacent beryllium block 4, so that the water flow holes 8 of the first fixed block 2, the second fixed block 5 and the beryllium block 4 form a through water flow channel, and the cooling water can flow in the water flow channel to internally cool the beryllium block 4, so as to prevent the beryllium block 4 from being excessively affected by excessive thermal stress. A plurality of water flow holes 8 can be respectively formed on the first fixed block 2, the second fixed block 5 and the beryllium block 4, for example, for a single beryllium block 4, the plurality of water flow holes 8 are circumferentially distributed, so that the cooling water can be more comprehensively and uniformly cooled from the inside of the beryllium block 4, thereby improving the heat dissipation efficiency of the beryllium block 4.

[0046] In some optional embodiments, the beryllium sleeve further comprises a flow blocking plug 6, the flow blocking plug 6 has a first lamination surface, the flow blocking plug 6 is laminated with the support 1 through the first lamination surface to keep relative fixation with the support 1, when the support 1 is provided as a circular tube structure, the first lamination surface here is an arc surface, and the cross-sectional shape of the entire flow blocking plug 6 can be provided as a crescent shape, in the extension direction of the core channel, the flow blocking plug 6 is located on one side of the second fixed block 5, and the flow blocking plug 6 and the second fixed block 5 have a certain gap to enable the cooling water to enter the water flow hole 8 of the second fixed block 5. By providing the flow blocking plug 6, the scouring intensity of the cooling water on the second fixed block 5 can be weakened to a certain extent, so as to ensure the connection stability between the second fixed block 5 and the support 1, and further ensure the overall structural stability of the beryllium sleeve.

[0047] In some optional embodiments, on the cross section of the core channel, the profile shape of the beryllium block 4 is non-circular. That is, in the axial view of the core channel, the outer profile shape of the beryllium block 4 is non-circular, so that the beryllium block 4 can have a larger area of the outer surface as much as possible, which is conducive to the rapid dissipation of heat.

[0048] In some optional embodiments, the outline shape of the beryllium block 4 is a polygonal line in the cross-section of the core channel. When the outline shape of the beryllium block 4 is polygonal, it has a larger outer surface area, ensuring better heat dissipation efficiency. Simultaneously, with its polygonal outline shape, the beryllium block 4 can have multiple straight edges and corners, making it easier to distribute external forces, resulting in better bending and torsional resistance. The corners also resist compressive and shear forces, thus giving the beryllium block higher strength and stability.

[0049] In some optional embodiments, one end of the support member 1 is provided with a lifting interface 3 suitable for use with lifting equipment. Preferably, the lifting interface 3 can be configured as a bayonet type to facilitate the use of lifting equipment with the support member 1.

[0050] In some optional embodiments, the beryllium sleeve further includes a positioning pin 7. The positioning pin 7 has a second contact surface, which is used to contact the support member 1 to maintain relative fixation. When the support member 1 is configured as a circular tube structure, the second contact surface is an arc surface, and the cross-sectional shape of the entire positioning pin 7 can be set as crescent-shaped. The positioning pin 7 can cooperate with the core assembly to form a pin connection, thereby facilitating remote positioning operations between the beryllium sleeve and the core assembly. In the extension direction of the core channel, the positioning pin 7 is located on one side of the first fixing block 2. Preferably, the end of the positioning pin 7 can be provided with a guide surface to facilitate the insertion and engagement of the positioning pin 7 with the core assembly; for example, the end of the positioning pin 7 can be constructed as a cone shape.

[0051] Secondly, embodiments of this application provide a core assembly for cooperating with any of the beryllium sleeves of the first aspect. The core assembly has a mating cavity with an inner wall adapted to the shape of the beryllium block 4, wherein there is a gap between the beryllium block 4 and the inner wall.

[0052] The core assembly also has a positioning hole suitable for the insertion of the positioning pin 7 and a mating groove that is adapted to the shape of the flow-blocking plug 6, so that the flow-blocking plug 6 and the positioning pin 7 on the beryllium sleeve can work together to play a positioning role.

[0053] Thirdly, please refer to Figure 2 This application provides a reactor irradiation testing device, including a beryllium sleeve 9 as described in the first aspect and a core assembly 11 as described in the second aspect, wherein... Figure 2 Three different specifications / types of beryllium sleeves 9 and reactor core assembly 11 are shown in their mating structures. After the beryllium sleeve 9 and reactor core assembly 11 are assembled, the contour shape of the beryllium sleeve 9 in the axial view of the reactor core channel is a broken line, which can form a water gap 10 with a large cross-sectional area between the two. The cooling water can efficiently cool the outer wall of the beryllium block 4 when flowing through the water gap 10. Combined with the setting of the water flow hole 8 on the beryllium block 4, the heat dissipation efficiency of the beryllium block 4 can be further improved, thereby preventing excessive thermal stress from affecting the beryllium block 4.

[0054] The above detailed description has shown, described and pointed out the manner in which the above-recited and other features and acts can be performed on and / or via the disclosed application, but it will be understood that various omissions, substitutions and changes in the form of the detail of the application illustrated, as well as the use of other forms, can be made by those skilled in the art without departing from the spirit of the disclosure and the disclosure is not limited to the embodiments described herein.

Claims

1. A beryllium sleeve for use in a reactor irradiation test facility to provide a core channel, characterised in that, The application relates to a beryllium sleeve (9) and a core assembly (11). The beryllium sleeve (9) comprises: a support (1) adapted to a core channel through which neutrons pass; a beryllium block (4) sleeved on the support (1), a plurality of the beryllium blocks (4) are arranged adjacently in the extension direction of the core channel, and the overall profile shape of the structure of the beryllium block (4) is a broken line in the cross section of the core channel; a first fixing block (2) matched with the support (1) and matched with the beryllium block (4); a second fixing block (5) matched with the support (1) and matched with the beryllium block (4), wherein the first fixing block (2) and the second fixing block (5) are respectively located on the two sides of the beryllium block (4) in the extension direction of the core channel; a flow resistance plug (6) having a first abutting surface, the flow resistance plug (6) is abutted with the support (1) through the first abutting surface to keep relative fixation with the support (1), and the flow resistance plug (6) is located on one side of the second fixing block (5) in the extension direction of the core channel; and a positioning pin (7) having a second abutting surface, the positioning pin (7) is abutted with the support (1) through the second abutting surface to keep relative fixation with the support (1), and the positioning pin (7) is located on one side of the first fixing block (2) in the extension direction of the core channel. The first fixing block (2) and the second fixing block (5) are respectively sleeved on the support (1). The first fixing block (2) and the second fixing block (5) are respectively engaged with the beryllium block (4). In the cross section of the core channel, the profile shape of the beryllium block (4) is non-circular. The support (1) is provided with a hoisting interface (3) adapted to cooperate with hoisting equipment at one end in the extension direction. The core assembly has a matching cavity with an inner wall matched with the shape of the beryllium block (4), and a gap is formed between the beryllium block (4) and the inner wall. The application further discloses a core assembly (11) comprising the beryllium sleeve (9) according to any one of claims 1-5 and the core assembly (11) according to claim 6.

2. The beryllium sleeve of claim 1, wherein, ​ 3. The beryllium sleeve of claim 1, wherein, ​ 4. The beryllium sleeve of claim 1, wherein, ​ 5. The beryllium sleeve of claim 1, wherein, ​ 6. A core assembly for use with the beryllium sleeve of any one of claims 1-5, wherein, ​ 7. A research reactor irradiation test facility characterized by, ​

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