Fuel basket assembly

Abstract

This application relates to a fuel basket assembly. The fuel basket assembly includes: two first modules spaced apart and arranged in opposite directions along a first direction, a connecting module connecting the two first modules, four panels, and four second modules; each first module includes three flat plates arranged sequentially along the first direction and six partitions arranged sequentially along a second direction; the six partitions divide the space between the second and third flat plates into three grids arranged sequentially along the second direction; the connecting module divides the space between the two first modules into three grids arranged along the second direction; the connecting structure formed by the second modules and the corresponding panels has three grids arranged sequentially along a direction parallel to the panels. In manufacturing this fuel basket assembly, each module can be processed separately and then welded together, optimizing the assembly process and reducing processing difficulty. It eliminates the need for full-length welding and ensures a reliable connection, reducing the amount and difficulty of welding and making welding thermal deformation easier to control.

Description

Technical Field

[0001] This application relates to the technical field of spent fuel storage and transportation devices for nuclear power plants, and in particular to fuel basket assemblies. Background Technology

[0002] Fuel assemblies removed from nuclear reactors are highly radioactive and continuously release decay heat, requiring them to be transferred to spent fuel pools at nuclear power plants for storage. After further decay and cooling in the spent fuel pools (a process that typically takes 6 to 10 years or even longer), the fuel assemblies must be transferred out of the pools using shielded containers and then transported to intermediate storage areas or reprocessing plants for reprocessing.

[0003] Depending on the technological approach, the mainstream intermediate storage technologies are currently divided into integrated storage and transportation container technology and concrete storage technology. Integrated storage and transportation containers can perform functions including loading fuel assemblies, in-plant and off-plant transportation, and long-term storage. Integrated storage and transportation containers generally consist of a metal container and fuel basket assemblies built into the metal container. The metal container primarily serves as radiation shielding, while the fuel basket assembly primarily maintains the subcritical state of spent fuel and supports and protects the fuel assemblies.

[0004] The overall topology of fuel basket assemblies is similar, mainly divided into square grid structures and honeycomb grid structures. The former is mainly used for square fuel assemblies, while the latter is mainly used for hexagonal fuel assemblies. Square grid structures are mainly divided into two types: plate splicing structures and multi-circular plate stacking structures. In related technologies, the manufacturing process of fuel basket assemblies with plate splicing structures mainly involves combining many plates, which is difficult to process. The plates are welded along their entire length, resulting in a large amount of welding, high welding difficulty, and difficulty in controlling welding deformation. Post-weld grinding and non-destructive testing are also difficult to perform. Summary of the Invention

[0005] Based on this, it is necessary to provide a fuel basket assembly that addresses the problems in the related technologies, such as the difficulty in manufacturing fuel basket assemblies with plate splicing structures, which mainly involve combining many plates, full-length welding between plates, large welding volume, high welding difficulty, difficulty in controlling welding deformation, and difficulty in performing post-weld grinding and non-destructive testing.

[0006] A fuel basket assembly includes: two first modules spaced apart and arranged in opposite directions along a first direction, and a connecting module connecting the two first modules; a panel is provided on both sides of the connection structure formed by the two first modules and the connecting module along the first direction and on both sides of the second direction, the second direction being perpendicular to the first direction;

[0007] The first module includes a first plate, a second plate, and a third plate arranged sequentially along a first direction, and six partitions arranged sequentially along a second direction. Each partition has a protrusion on each side along the first direction, and the protrusion has a boss protruding in the first direction. The protrusion of the partition near the connecting module engages with and is welded to a slot on the second plate, and the boss on the protrusion engages with and is welded to a mating groove on the first plate. The protrusion of the partition away from the connecting module engages with and is welded to a slot on the third plate, and the boss on the protrusion engages with and is welded to a mating groove on the corresponding panel. Among the six partitions, a sandwich is formed between the first partition and the corresponding panel, between the second and third partitions, between the fourth and fifth partitions, and between the sixth partition and the corresponding panel, such that the six partitions divide the space between the second and third plates into three grids arranged sequentially along the second direction, and each grid has a sandwich for setting neutron-absorbing material around its perimeter.

[0008] The connecting module divides the space between the two first modules into three grids arranged along a second direction; each panel has a second module on the side opposite to the connecting structure; the connecting structure formed by the second module and the corresponding panel has three grids arranged sequentially along a direction parallel to the panel; the grids are used to accommodate fuel assemblies.

[0009] In one embodiment, the connecting module includes a first connecting plate, two hollow square tubes, and a second connecting plate arranged sequentially at intervals along a second direction, such that the connecting module divides the space between the two first modules into three grids arranged along the second direction; the space inside the hollow square tubes forms a sandwich for setting neutron absorbing material; the first connecting plate is aligned with the first partition plate such that a sandwich for setting neutron absorbing material is formed between the first connecting plate and the corresponding panel; the second connecting plate is aligned with the sixth partition plate such that a sandwich for setting neutron absorbing material is formed between the second connecting plate and the corresponding panel.

[0010] In one embodiment, the second module includes a bent plate, which includes a main board and two side plates located at both ends of the main board, such that the bent plate forms a groove, and two hollow square tubes are spaced apart between the two side plates; the open end of the bent plate faces the corresponding panel, so that the connection structure formed by the second module and the corresponding panel forms three grids arranged sequentially in a direction parallel to the panel; the space inside the hollow square tube forms a sandwich for setting neutron absorbing material.

[0011] In one embodiment, the fuel basket assembly further includes a first heat-dissipating aluminum block; a receiving groove is formed between two adjacent side plates of two adjacent second modules, and a plurality of support blocks are arranged at intervals along a third direction in the receiving groove; the first heat-dissipating aluminum block is provided with support grooves that correspond one-to-one with the support blocks, the first heat-dissipating aluminum block is bolted to the support blocks, and the third direction is perpendicular to the first direction and the second direction.

[0012] In one embodiment, each of the receiving slots is provided with at least two first heat-dissipating aluminum blocks arranged sequentially along the third direction; there is a gap between adjacent first heat-dissipating aluminum blocks along the third direction.

[0013] In one embodiment, two adjacent support blocks of each first heat dissipation aluminum block are arranged perpendicularly to each other; and of the two adjacent support blocks, one support block is attached to one of the two adjacent side plates, and the other support block is attached to the other side plate of the two adjacent side plates.

[0014] In one embodiment, the fuel basket assembly further includes a second heat-dissipating aluminum block; the second module has a plurality of support pins spaced apart along a third direction on the side opposite to the corresponding panel, and a plurality of connecting blocks spaced apart along a third direction are respectively provided on both sides of the plurality of support pins; the second heat-dissipating aluminum block has pin holes that mate with the support pins one by one and connecting holes that mate with the connecting blocks one by one; the second heat-dissipating aluminum block is bolted to the connecting blocks.

[0015] In one embodiment, each second module has at least two second heat dissipation aluminum blocks arranged sequentially along the third direction on the side opposite to the corresponding panel, and there is a gap between adjacent second heat dissipation aluminum blocks along the third direction.

[0016] In one embodiment, the second module is provided with an anti-rotation limiting block on the side opposite to the corresponding panel. The anti-rotation limiting block is used to cooperate with the anti-rotation limiting groove on the inner wall of the metal container of the integrated storage and transportation container.

[0017] In one embodiment, a guide block is welded above each of the interlayers, and each guide block has a slope on both sides, the slope facing the center of the corresponding grid and inclined outward from the grid.

[0018] In one embodiment, two neutron absorbing plates are arranged in the interlayer along the thickness direction of the interlayer; an aluminum adjustment plate is provided between the two neutron absorbing plates, the aluminum adjustment plate being used to adjust the fitting gap of the neutron absorbing plates in the interlayer; a support block is provided at the bottom of the interlayer along a third direction, the support block being used to support the two neutron absorbing plates and the aluminum adjustment plate.

[0019] In one embodiment, an active segment limiting block is provided at the top of the interlayer along a third direction, and the neutron absorber plate is located between the active segment limiting block and the support block. The active segment limiting block is used to limit the neutron absorber plate within the range corresponding to the active segment of the fuel assembly.

[0020] An integrated storage and transportation container includes a metal container and a fuel basket assembly as described in any of the above embodiments, wherein the fuel basket assembly is disposed within the metal container.

[0021] Compared to existing fuel basket assemblies consisting of plates with the same number of grids, the aforementioned fuel basket assembly includes two first modules, a connecting module, four second modules, and a panel module (i.e., four panels). In manufacturing the fuel basket assembly of this application, each module can be processed separately and then welded together, optimizing the assembly process, facilitating assembly and welding, and reducing processing difficulty. Specifically, the plates in the first module are welded at the snap-fit ​​structures (i.e., the snap-fit ​​positions of the protrusions and bosses), thus eliminating the need for full-length welding and ensuring a secure connection. This reduces the amount of welding, simplifies welding difficulty, makes welding thermal deformation easier to control, and facilitates post-weld grinding and non-destructive testing. Furthermore, the arrangement of the plates in the first module allows each of the three grids in the first module to have a sandwich layer around its perimeter for storing neutron-absorbing material. This not only effectively absorbs neutrons released by the fuel assembly within each of the three grids, but the sandwich layer also increases the structural rigidity of the fuel basket assembly, and eliminates the need for additional welding of the sandwich layer, simplifying processing. Meanwhile, using a sandwich structure to fix the neutron absorbing material overcomes the disadvantage of the difficulty in processing such brittle materials, and the sandwich structure can provide effective protection for the neutron absorbing material. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a fuel basket assembly according to one embodiment.

[0023] Figure 2 for Figure 1 A schematic diagram of the connection structure of the first module, second module, connecting module, and panel of the fuel basket assembly.

[0024] Figure 3 for Figure 2 Top view.

[0025] Figure 4 for Figure 3 The module breakdown diagram.

[0026] Figure 5 for Figure 4 The structural breakdown diagram of the first module.

[0027] Figure 6 for Figure 4 A schematic diagram of the structure of the connection module.

[0028] Figure 7 for Figure 4 The structural breakdown diagram of the second module.

[0029] Figure 8 for Figure 1 A schematic diagram of the fuel basket assembly removing the first and second heat dissipation aluminum blocks.

[0030] Figure 9 for Figure 1 Fuel basket assembly removal Figure 8 A schematic diagram of its structure.

[0031] Figure 10 for Figure 9 A schematic diagram from another perspective of the first heat dissipation aluminum block.

[0032] Figure 11 for Figure 9 A schematic diagram from another perspective of the second heat dissipation aluminum block.

[0033] Figure 12 for Figure 1 , Figure 8 A schematic diagram of the guide block structure.

[0034] Figure 13 This is a perspective view of a mezzanine in one embodiment.

[0035] Figure 14 for Figure 13 An exploded view of the internal structure of the interlayer.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Fuel basket assembly;

[0038] 10. Square frame;

[0039] 100. First module; 111. First plate; 1111. Mating groove on first plate 111; 112. Second plate; 1121. Slot on second plate 112; 113. Third plate; 1131. Slot on third plate 113; 121. First partition; 122. Second partition; 123. Third partition; 124. Fourth partition; 125. Fifth partition; 126. Sixth partition; 131. Protrusion; 132. Boss;

[0040] 200. Connecting module; 210. First connecting plate; 220. Second connecting plate;

[0041] 300, Panel;

[0042] 400. Second module; 410. Main board; 420. Side panel; 421. First side panel; 422. Second side panel;

[0043] 510. Grid; 520. Mezzanine; 530. Hollow square tube; 540. Guide block; 541. Inclined surface;

[0044] 610. First heat dissipation aluminum block; 611. Receiving groove; 612. Support block; 613. Support groove; 620. Second heat dissipation aluminum block; 621. Support pin; 622. Connecting block; 623. Pin hole; 624. Connecting hole; 630. Anti-rotation limiting block; 631. Fixing part; 632. Mating key;

[0045] 710. Neutron absorber plate; 720. Aluminum adjustment plate; 730. Support block; 740. Active segment limiting block. Detailed Implementation

[0046] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0047] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing 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, and therefore should not be construed as a limitation of this application.

[0048] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0052] Please refer to Figure 1 This application provides a fuel basket assembly 1 in one embodiment. For ease of explanation, the directions are described below using a first direction X, a second direction Y, and a third direction Z. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other. In actual use, the third direction Z is along the length direction of the fuel basket assembly 1 (i.e., the length direction of the fuel assembly). Combined with... Figures 2 to 4 The fuel basket assembly 1 includes: two first modules 100 spaced apart and arranged in opposite directions along a first direction X, and a connecting module 200 connecting the two first modules 100. A panel 300 is provided on each side of the connecting structure formed by the two first modules 100 and the connecting module 200 along the first direction X and on each side along the second direction Y. The panel 300 can be connected to the connecting structure by welding. The connecting module 200 can be connected to the two first modules 100 by welding.

[0053] Combination Figure 4 and Figure 5 The first module 100 includes a first plate 111, a second plate 112, and a third plate 113 arranged sequentially along a first direction X, and six partitions arranged sequentially along a second direction Y. The six partitions arranged sequentially along the second direction Y are a first partition 121, a second partition 122, a third partition 123, a fourth partition 124, a fifth partition 125, and a sixth partition 126. Each partition has a protrusion 131 on both sides along the first direction X, and the protrusion 131 has a boss 132 protruding in the first direction X. The protrusion 131 on the side of the partition closest to the connecting module 200 mates with and is welded to a slot 1121 on the second plate 112, and the boss 132 on the protrusion 131 mates with and is welded to a mating groove 1111 on the first plate 111. The protrusion 131 on the side of the partition away from the connecting module 200 engages with and is welded to the slot 1131 on the third plate 113. The boss 132 on the protrusion 131 engages with and is welded to the corresponding mating groove (not shown) on the panel 300.

[0054] Of the six partitions, a sandwich 520 is formed between the first partition 121 and the corresponding panel 300 (i.e., the panel 300 on the side of the first partition 121 facing away from the second partition 122), a sandwich 520 is formed between the second partition 122 and the third partition 123, a sandwich 520 is formed between the fourth partition 124 and the fifth partition 125, and a sandwich 520 is formed between the sixth partition 126 and the corresponding panel 300 (i.e., the panel 300 on the side of the sixth partition 126 facing away from the fifth partition 125). Thus, the six partitions divide the space between the second plate 112 and the third plate 113 into three grids 510 arranged sequentially along the second direction Y, and each of the three grids 510 has a sandwich 520 around its perimeter for setting neutron absorbing material. The first partition 121, the second partition 122, the second plate 112, and the third plate 113 form a grid 510; the third partition 123, the fourth partition 124, the second plate 112, and the third plate 113 form a grid 510; and the fifth partition 125, the fourth partition 126, the second plate 112, and the third plate 113 form a grid 510. Three interlayers 510 are formed between the first plate 111 and the second plate 112, and these three interlayers 510 correspond one-to-one with the three grids 510. Three interlayers 510 are formed between the third plate 113 and the corresponding panel 300, and these three interlayers 510 correspond one-to-one with the three grids 510.

[0055] The connecting module 200 divides the space between the two first modules 100 into three grids 510 arranged along the second direction Y. Each panel 300 has a second module 400 on the side opposite to the connecting structure. The second module 400 can be connected to the corresponding panel 300 by welding. The connecting structure formed by the second module 400 and the corresponding panel 300 has three grids 510 arranged sequentially along a direction parallel to the panel 300.

[0056] Each of the aforementioned grids 510 is used to accommodate a fuel assembly. The thickness of the interlayer 520 is less than the length of any side of the grid 510.

[0057] Compared to existing fuel basket assemblies consisting of sheet metal panels with the same number of grids, the aforementioned fuel basket assembly 1 includes two first modules 100, a connecting module 200, four second modules 400, and panel modules (i.e., four panels 300). In manufacturing the fuel basket assembly 1 of this application, each module can be processed separately and then welded together, optimizing the assembly process, facilitating assembly and welding, and reducing processing difficulty. Specifically, the individual plates in the first module 100 are welded at the snap-fit ​​structures (i.e., the snap-fit ​​positions of the protrusions and bosses), thus eliminating the need for full-length welding and ensuring a secure connection. This reduces the amount of welding, decreases welding difficulty, makes welding thermal deformation easier to control, and facilitates post-weld grinding and non-destructive testing. Furthermore, the arrangement of the plates in the first module 100 ensures that each of the three grids 510 in the first module 100 has a sandwich layer 520 around its perimeter for placing neutron-absorbing material. This not only effectively absorbs neutrons released from the fuel assembly within each of the three grids 510, but also increases the structural rigidity of the fuel basket assembly 1. Moreover, the sandwich layer 520 eliminates the need for additional welding, simplifying manufacturing. Simultaneously, using a sandwich layer to fix the neutron-absorbing material overcomes the difficulty in processing such brittle materials, and provides effective protection for the neutron-absorbing material through the sandwich layer 520.

[0058] During assembly, the two first modules 100, the connecting module 200, and the four panels 300 can be assembled and welded together to form a stable square frame 10 structure. Then, the second module 400 is welded onto the square frame 10 structure to obtain the main structure of the fuel basket assembly 1.

[0059] Combination Figure 4 and Figure 6In one embodiment, the connecting module 200 includes a first connecting plate 210, two hollow square tubes 530, and a second connecting plate 220 arranged sequentially at intervals along a second direction Y, such that the connecting module 200 divides the space between the two first modules 100 into three grids 510 arranged along the second direction Y. The first connecting plate 210, the two hollow square tubes 530, and the second connecting plate 220 are respectively welded to the two first modules 100 at their ends along a first direction X. The space inside the hollow square tubes 530 forms a sandwich 520 for setting neutron absorbing material. The first connecting plate 210 is aligned with the first partition 121, such that a sandwich 520 for setting neutron absorbing material is formed between the first connecting plate 210 and the corresponding panel 300 (i.e., the panel 300 on the side of the first partition 121 facing away from the second partition 122). The second connecting plate 220 is aligned with the sixth partition plate 126, such that a sandwich layer 520 for setting neutron absorbing material is formed between the second connecting plate 220 and the corresponding panel 300 (i.e., the panel 300 on the side of the second partition plate 122 facing away from the second partition plate 121). Thus, each of the three grids 510 in the connecting module 200 has a sandwich layer 520 for setting neutron absorbing material around its perimeter. The three sandwich layers 510 formed between the first plate 111 and the second plate 112 in each first module 100 correspond one-to-one with the three grids 510 in the connecting module 200.

[0060] Therefore, by setting up the first plate 111 and the second plate 112 in the two first modules 100, the two panels 300 on both sides of the connecting module 200 along the second direction Y, and the connecting module 200, each of the three grids 510 in the connecting module 200 has a sandwich layer 520 around its perimeter for setting neutron absorbing material. This not only fully absorbs the neutrons released by the fuel assembly in each of the three grids 510, but also improves the structural rigidity of the fuel basket assembly 1. Moreover, no additional welding of the sandwich layer 520 is required, making it easy to process.

[0061] Combination Figure 4 and Figure 7In one embodiment, the second module 400 includes a bent plate, which includes a main plate 410 and two side plates 420 located at both ends of the main plate 410, so that the bent plate forms a groove. Two hollow square tubes 530 are spaced apart between the two side plates 420. The open end of the bent plate faces the corresponding panel 300, so that the connection structure formed by the second module 400 and the corresponding panel 300 forms three grids 510 arranged sequentially in a direction parallel to the panel 300. The space inside the hollow square tubes 530 forms a sandwich layer 520 for placing neutron absorbing material. In each second module 400, the two side plates 510 and the two hollow square tubes 530 of the bent plate are respectively welded to the corresponding panel 300. The three sandwich layers 520 formed between the panel 300 and the third plate 113 of each second module 400 correspond one-to-one with the three grids 510 in the second module 400. Thus, each of the three grids 510 in the second module 400 is surrounded by a sandwich layer 520, which not only fully absorbs the neutrons released by the fuel assembly in each of the three grids 510, but also improves the structural rigidity of the fuel basket assembly 1. Moreover, no additional welding of the sandwich layer 520 is required, making it easy to process.

[0062] Please combine Figure 1 , Figure 3 , Figure 4 , Figures 8 to 10 In one embodiment, the fuel basket assembly 1 further includes a first heat-dissipating aluminum block 610 for dissipating heat from the fuel assembly. A receiving groove 611 is formed between two adjacent side plates 420 (such as the first side plate 421 and the second side plate 422) of two adjacent second modules 400. A plurality of support blocks 612 are arranged at Z-intervals along a third direction within the receiving groove 611. The first heat-dissipating aluminum block 610 has support grooves 613 that correspond one-to-one with the support blocks 612, and the first heat-dissipating aluminum block 610 is bolted to the support blocks 612.

[0063] Compared to existing technologies that rely on numerous bolts to fix the heat dissipation aluminum block, which suffers from problems such as a large number of bolts, difficulty in ensuring bolt perpendicularity, and uneven nut tightening, this embodiment addresses these issues. When assembling the first heat dissipation aluminum block 610, the support block 612 first supports and positions the first heat dissipation aluminum block 610 by engaging with the support groove 613. After ensuring the correct positioning of the first heat dissipation aluminum block 610, bolt holes are drilled in both the first heat dissipation aluminum block 610 and the support block 612. This ensures alignment of the bolt holes on the first heat dissipation aluminum block 610 and the support block 612, thereby guaranteeing bolt perpendicularity, nut flatness, and the flatness of the first heat dissipation aluminum block 610 (and the adjacent side plates 420). Furthermore, because the support block 612 supports and positions the first heat dissipation aluminum block 610, the number of connecting bolts can be reduced.

[0064] Please combine Figure 1 , Figures 8 to 10 Each receiving slot 611 contains at least two first heat-dissipating aluminum blocks 610 arranged sequentially along the third direction Z. A gap exists between adjacent first heat-dissipating aluminum blocks 610 along the third direction Z. Using at least two first heat-dissipating aluminum blocks 610 within the third direction Z (i.e., the length direction) of the fuel basket assembly 1 (compared to using a single block) reduces processing difficulty and improves processing accuracy. Furthermore, it reduces the problem of excessive thermal stress caused by thermal expansion. The gap between adjacent first heat-dissipating aluminum blocks 610 provides space for thermal expansion, preventing adjacent first heat-dissipating aluminum blocks 610 from squeezing against each other.

[0065] Please combine Figure 1 , Figures 8 to 10 In each first heat dissipation aluminum block 610, two adjacent support blocks 612 are arranged perpendicularly to each other. In these two adjacent support blocks 612, one support block 612 is attached to one of the two adjacent side plates 420, and the other support block 612 is attached to the other side plate 420 of the two adjacent side plates 420.

[0066] exist Figures 8 to 10 In the illustrated embodiment, each first heat dissipation aluminum block 610 corresponds to three support blocks 612, with adjacent support blocks 612 arranged perpendicularly to each other. Of these two adjacent support blocks 612, one support block 612 is fitted to one of the two adjacent side plates 420 (first side plate 421), and the other support block 612 is fitted to the other of the two adjacent side plates 420 (second side plate 422). Thus, the multiple support blocks 612 corresponding to each first heat dissipation aluminum block 610 can support the first heat dissipation aluminum block 610 more accurately and reliably, thereby significantly reducing the number of connecting bolts, reducing welding, lowering manufacturing difficulty, and improving the flatness of the fit between the first heat dissipation aluminum block 610 and the adjacent two side plates 420.

[0067] Please combine Figure 1 , Figure 8 , Figure 9 , Figure 11 In one embodiment, the fuel basket assembly 1 further includes a second heat-dissipating aluminum block 620 for dissipating heat from the fuel assembly. On the side of the second module 400 opposite to the corresponding panel 300, a plurality of support pins 621 are arranged at Z-intervals along the third direction. On both sides of the plurality of support pins 621, a plurality of connecting blocks 622 are arranged at Z-intervals along the third direction. The second heat-dissipating aluminum block 620 has pin holes 623 that correspond one-to-one with the support pins 621 and connecting holes 624 that correspond one-to-one with the connecting blocks 622. The second heat-dissipating aluminum block 620 is bolted to the connecting blocks 622.

[0068] Compared to existing technologies that rely on numerous bolts to fix the heat dissipation aluminum block, which suffers from problems such as a large number of bolts, difficulty in ensuring bolt perpendicularity, and uneven nut tightening, this embodiment addresses these issues. When assembling the second heat dissipation aluminum block 620, the connecting block 622 engages with the connecting hole 624, and the pin hole 623 engages with the support pin 621. This allows the support pin 621 and connecting block 622 to support and position the second heat dissipation aluminum block 620, ensuring its correct positioning. Then, bolt holes are drilled in both the second heat dissipation aluminum block 620 and the connecting block 622. This ensures alignment of the bolt holes on the second heat dissipation aluminum block 620 and the connecting block 622, thereby guaranteeing bolt perpendicularity, nut flatness, and a smooth fit between the second heat dissipation aluminum block 620 and the second module 400. Furthermore, because the support pin 621 and connecting block 622 support and position the second heat dissipation aluminum block 620, the number of connecting bolts can be reduced.

[0069] Please combine Figure 1 , Figure 8 , Figure 9 , Figure 11 In one embodiment, each second module 400 is provided with at least two second heat dissipation aluminum blocks 620 arranged sequentially along the third direction Z on the side opposite to the corresponding panel 300, and there is a gap between adjacent second heat dissipation aluminum blocks 620 along the third direction Z.

[0070] Setting the fuel basket assembly 1 into at least two second heat dissipation aluminum blocks 620 within the third direction Z (i.e., the length direction) reduces the processing difficulty and improves processing accuracy (compared to setting a single block), and also reduces the problem of excessive thermal stress caused by thermal expansion. The gap between adjacent second heat dissipation aluminum blocks 620 along the third direction Z provides space for thermal expansion and avoids adjacent second heat dissipation aluminum blocks 620 from squeezing each other.

[0071] Please refer to Figure 8 In one embodiment, the second module 400 has an anti-rotation limiting block 630 on the side opposite to the corresponding panel 300. The anti-rotation limiting block 630 is used to cooperate with the anti-rotation limiting groove on the inner wall of the metal container of the integrated storage and transportation container to prevent the fuel basket assembly 1 from rotating relative to the metal container during transportation. The anti-rotation limiting block 630 includes a fixed part 631 and a mating key 632 connected to it. The fixed part 631 is connected to the second module 400, and the mating key 632 is located on the side of the fixed part 631 opposite to the second module 400 and cooperates with the anti-rotation limiting groove.

[0072] Combination Figures 1 to 3 , Figure 8 , Figure 12Each interlayer 520 has a guide block 540 welded above it. The guide block 540 has a slope 541 on each side. The slope 541 faces the center of the corresponding grid 510 and is inclined outward from the grid 510. Thus, the slopes 541 around the top of the grid 510 form a flared structure to provide guidance for the fuel assembly to enter the grid 510.

[0073] Combination Figure 13 and Figure 14 In one embodiment, two neutron absorber plates 710 are disposed within the interlayer 520, arranged along the thickness direction of the interlayer 520. The two neutron absorber plates 710 can be used to absorb neutrons released from fuel assemblies within the grids 510 on both sides of the interlayer 510.

[0074] An aluminum adjustment plate 720 is disposed between the two neutron absorber plates 710. The aluminum adjustment plate 720 is used to adjust the fitting clearance of the neutron absorber plates 710 within the interlayer 520. Neutron absorber plates 710 of different thicknesses can be used depending on the parameters of different fuel assemblies. In order to ensure that neutron absorber plates 710 of different thicknesses have a suitable fitting clearance within the interlayer 520, aluminum adjustment plates 720 of different thicknesses can be used for adjustment.

[0075] A support block 730 is provided at the bottom of the interlayer 520 along the third direction Z. The support block 730 is used to support the two neutron absorber plates 710 and the aluminum adjustment plate 720. The support block 730 can be welded to the inner wall of the interlayer 520.

[0076] In one embodiment, there is a gap between the support block 730 and a portion of the inner wall of the interlayer 520 to allow for the flow of inert gas within the integrated storage and transport container.

[0077] Combination Figure 13 and Figure 14 In one embodiment, an active segment limiting block 740 is provided at the top of the interlayer 520 along the third direction Z, and a neutron absorber plate 710 is located between the active segment limiting block 740 and the support block 730. The active segment limiting block 740 is used to limit the neutron absorber plate 710 within the range corresponding to the active segment of the fuel assembly.

[0078] The active section of a fuel assembly refers to the length of the region in the fuel assembly where the fuel pellets are loaded. This region is where neutrons can be released and needs to be absorbed by a neutron absorber plate 710.

[0079] By setting the active segment limiting block 740, on the one hand, the neutron absorber plate 710 can be kept in the interlayer 520 and not fall out. On the other hand, in the event of a drop accident of the integrated storage and transportation container, even if the top of the integrated storage and transportation container is facing down, the active segment limiting block 740 can still limit the displacement of the neutron absorber plate 710, so that the neutron absorber plate 710 is limited within the range corresponding to the active segment of the fuel assembly. Thus, the neutron absorber plate 710 can still effectively absorb the neutrons released by the active segment of the fuel assembly.

[0080] One embodiment of this application provides an integrated storage and transportation container, including a metal container and a fuel basket assembly 1 as described above, wherein the fuel basket assembly 1 is disposed inside the metal container.

[0081] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A fuel basket assembly, characterized in that, The fuel basket assembly includes: two first modules spaced apart and arranged in opposite directions along a first direction and a connecting module connected between the two first modules; the connecting structure formed by the two first modules and the connecting module has a panel on each side along the first direction and on each side along the second direction, the second direction being perpendicular to the first direction; The first module includes a first plate, a second plate, and a third plate arranged sequentially along a first direction, and six partitions arranged sequentially along a second direction. Each partition has a protrusion on each side along the first direction, and the protrusion has a boss protruding in the first direction. The protrusion of the partition near the connecting module engages with and is welded to a slot on the second plate, and the boss on the protrusion engages with and is welded to a mating groove on the first plate. The protrusion of the partition away from the connecting module engages with and is welded to a slot on the third plate, and the boss on the protrusion engages with and is welded to a mating groove on the corresponding panel. Among the six partitions, a sandwich is formed between the first partition and the corresponding panel, between the second and third partitions, between the fourth and fifth partitions, and between the sixth partition and the corresponding panel, such that the six partitions divide the space between the second and third plates into three grids arranged sequentially along the second direction, and each grid has a sandwich for setting neutron-absorbing material around its perimeter. The connecting module divides the space between the two first modules into three grids arranged along a second direction; each panel has a second module on the side opposite to the connecting structure; the connecting structure formed by the second module and the corresponding panel has three grids arranged sequentially along a direction parallel to the panel; the grids are used to accommodate fuel assemblies; The connecting module includes a first connecting plate, two hollow square tubes, and a second connecting plate arranged sequentially at intervals along a second direction, such that the connecting module divides the space between the two first modules into three grids arranged along the second direction; the space inside the hollow square tubes forms a sandwich for setting neutron absorbing material; the first connecting plate is aligned with the first partition plate such that a sandwich for setting neutron absorbing material is formed between the first connecting plate and the corresponding panel; the second connecting plate is aligned with the sixth partition plate such that a sandwich for setting neutron absorbing material is formed between the second connecting plate and the corresponding panel. The second module includes a bent plate, which includes a main board and two side plates located at both ends of the main board, so that the bent plate forms a groove. Two hollow square tubes are spaced apart between the two side plates. The open end of the bent plate faces the corresponding panel, so that three grids are formed in sequence along a direction parallel to the panel in the connection structure formed by the second module and the corresponding panel. The space inside the hollow square tube forms a sandwich for setting neutron absorbing material.

2. The fuel basket assembly according to claim 1, characterized in that, It also includes a first heat dissipation aluminum block; a receiving groove is formed between the two adjacent side plates of the two second modules, and a plurality of support blocks are arranged at intervals along a third direction in the receiving groove; the first heat dissipation aluminum block is provided with a support groove that corresponds to the support block one by one, the first heat dissipation aluminum block is bolted to the support block, and the third direction is perpendicular to the first direction and the second direction.

3. The fuel basket assembly according to claim 2, characterized in that, Each of the receiving slots is provided with at least two first heat dissipation aluminum blocks arranged sequentially along the third direction; there is a gap between adjacent first heat dissipation aluminum blocks along the third direction.

4. The fuel basket assembly according to claim 2, characterized in that, Two adjacent support blocks are arranged perpendicularly to each of the plurality of support blocks corresponding to the first heat dissipation aluminum block; and one of the two adjacent support blocks is attached to one of the two adjacent side plates, and the other support block is attached to the other side plate of the two adjacent side plates.

5. The fuel basket assembly according to claim 1, characterized in that, It also includes a second heat dissipation aluminum block; the second module has a plurality of support pins arranged at intervals along a third direction on the side opposite to the corresponding panel, and a plurality of connecting blocks arranged at intervals along a third direction are respectively provided on both sides of the plurality of support pins; the second heat dissipation aluminum block is provided with pin holes that correspond to the support pins and connecting holes that correspond to the connecting blocks; the second heat dissipation aluminum block is bolted to the connecting blocks.

6. The fuel basket assembly according to claim 5, characterized in that, Each of the second modules has at least two second heat dissipation aluminum blocks arranged sequentially along the third direction on the side opposite to the corresponding panel, and there is a gap between adjacent second heat dissipation aluminum blocks along the third direction.

7. The fuel basket assembly according to claim 1, characterized in that, The second module has an anti-rotation limiting block on the side opposite to the corresponding panel. The anti-rotation limiting block is used to cooperate with the anti-rotation limiting groove on the inner wall of the metal container of the integrated storage and transportation container.

8. The fuel basket assembly according to claim 1, characterized in that, Each of the interlayers is welded to the top of a guide block, each guide block having a slope on both sides, the slope facing the center of the corresponding grid and tilting outward from the grid.

9. The fuel basket assembly according to claim 1, characterized in that, The interlayer contains two neutron absorbing plates arranged along the thickness direction of the interlayer. An aluminum adjustment plate is provided between the two neutron absorbers, and the aluminum adjustment plate is used to adjust the fitting gap of the neutron absorbers in the interlayer; A support block is provided at the bottom of the interlayer along a third direction, and the support block is used to support the two neutron absorption plates and the aluminum adjustment plate.

10. The fuel basket assembly according to claim 9, characterized in that, An active segment limiting block is provided at the top of the interlayer along a third direction. The neutron absorber plate is located between the active segment limiting block and the support block. The active segment limiting block is used to limit the neutron absorber plate within the range corresponding to the active segment of the fuel assembly.

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