Nuclear fuel rod extraction inspection mockup assembly

Abstract

The application belongs to the technical field of nuclear fuel rod inspection, and particularly relates to a nuclear fuel rod extraction inspection simulation assembly, which comprises simulation fuel rods, an upper tube seat module, a lower tube seat module and a connecting assembly. The connecting assembly comprises a third simulation grid and a plurality of connecting modules. Each connecting module comprises a connecting sub-tube and first and second connecting members arranged at two ends of the connecting sub-tube. The plurality of connecting modules are detachably connected with the third simulation grid through the first and second connecting members, so that the connecting sub-tubes of the plurality of connecting modules are sequentially spliced and communicated to form accommodating holes for the simulation fuel rods to pass through. The first connecting member at one end of the connecting assembly is detachably connected with the upper tube seat module, and the second connecting member at the other end of the connecting assembly is detachably connected with the lower tube seat module. The nuclear fuel rod extraction inspection simulation assembly relies on the modular split structure, shortens the auxiliary operation time length of field operation, and improves the operation fluency of nuclear power equipment drills and re-identification tests.

Description

Technical Field

[0001] This application belongs to the field of nuclear fuel rod inspection technology, and in particular relates to a nuclear fuel rod removal inspection simulation component. Background Technology

[0002] Before nuclear fuel rod removal inspection at a nuclear power plant, a full-process operation drill and re-qualification test must be conducted on the supporting equipment to verify whether the equipment performance, accuracy and stability meet the operation standards and avoid safety risks caused by insufficient equipment compatibility. This is a necessary prerequisite for ensuring the safe and standardized implementation of overhaul operations.

[0003] Currently, the industry uses simulated fuel assemblies for practical simulation operations in the full-process drills and re-qualification tests of equipment for rod removal inspection. First, a simulated fuel assembly in the spent fuel pool of a nuclear power plant is selected as the test carrier. The simulated fuel assembly is hoisted from the spent fuel pool to the repair pool, and the underwater disassembly and assembly of the upper tube seat, the removal of the simulated fuel rod, the flipping of the simulated fuel assembly, and the underwater disassembly and assembly of the lower tube seat are completed in sequence. After all the simulated operation procedures are completed, the simulated fuel assembly is hoisted back to the spent fuel pool. This fully replicates the entire process of a real rod removal inspection, achieving a comprehensive verification of the performance of the supporting equipment.

[0004] However, during each simulated fuel assembly drill, the simulated fuel assembly must be hoisted from the spent fuel pool to the repair pool. During hoisting, specialized long-handled tools need to be assembled in advance to meet the requirements of the operation. The assembly of these tools, the hoisting of the simulated fuel assembly, and the disassembly of the tools are all cumbersome and complex. This not only significantly increases the difficulty and workload of on-site operations and raises the safety risks of underwater and high-altitude hoisting operations, but also makes each auxiliary operation time-consuming, labor-intensive, and protracted. This severely reduces the overall efficiency of the entire process of drills and re-qualification tests for the rod removal inspection equipment, hindering the efficient advancement of nuclear power plant overhaul operations and failing to meet the development needs of improving the quality and efficiency of nuclear power operation and maintenance. Summary of the Invention

[0005] The purpose of this application is to provide a nuclear fuel rod removal inspection simulation component, which can improve the overall work efficiency of the entire process of rod removal inspection equipment drills and re-qualification tests.

[0006] To achieve the above objectives, the technical solution adopted in this application is: a nuclear fuel rod removal inspection simulation assembly, comprising a simulated fuel rod, an upper tube seat module, a lower tube seat module, and a connecting assembly; the upper tube seat module includes an upper tube seat, a first connecting pipe, and a first simulated grid, one end of the first connecting pipe being detachably connected to the upper tube seat, and the other end of the first connecting pipe being connected to the first simulated grid; the lower tube seat module includes a lower tube seat, a second connecting pipe, and a second simulated grid, one end of the second connecting pipe being detachably connected to the lower tube seat, and the other end of the second connecting pipe being connected to the second simulated grid; the connecting assembly includes multiple connecting modules and a third module disposed between two adjacent connecting modules. The simulated grid includes a connecting sub-tube and a first connector and a second connector at both ends of the connecting sub-tube. Multiple connecting modules are detachably connected to the third simulated grid through the first connector and the second connector, so that the connecting sub-tubes of multiple connecting modules are sequentially spliced ​​and connected to form a receiving hole, in which a simulated fuel rod is inserted. The first connector at one end of the connecting assembly is detachably connected to the first simulated grid, and the second connector at the other end of the connecting assembly is detachably connected to the second simulated grid. The first simulated grid has a first through hole for the simulated fuel rod to pass through the receiving hole. A sealing plate is provided at the end of the receiving hole facing the lower tube seat module to block the opening of the receiving hole.

[0007] Optionally, the first connector includes a first body and a first flange edge surrounding the first body, the first body being fitted and fixed to one end of the connecting sub-tube; the second connector includes a second body and a second flange edge surrounding the second body, the second body being fitted and fixed to the other end of the connecting sub-tube; the nuclear fuel rod removal inspection simulation assembly further includes a first fastener, at the connection of two adjacent connecting sub-tubes, the first fastener sequentially passes through the first flange edge, the third simulation grid, and the second flange edge, so that the first flange edge and the second flange edge clamp and fix the third simulation grid.

[0008] Optionally, the first body part includes a first body segment and a second body segment connected together, the second body part includes a third body segment and a fourth body segment connected together, a first flange edge is provided on the outer peripheral surface of the first body segment, and a second flange edge is provided on the outer peripheral surface of the third body segment; the third simulation grid is provided with a second through hole, the second body segment and the fourth body segment pass through the second through hole and are connected, so that the connecting sub-pipes of the two adjacent connecting modules are connected, and the second through hole can restrict the rotation of the second body segment and the fourth body segment within the second through hole.

[0009] Optionally, the wall of the second through hole is provided with a first limiting plane, and the second and fourth sleeve segments are provided with a second limiting plane for abutting against the first limiting plane.

[0010] Optionally, the connecting tube includes an inner tube for inserting the simulated fuel rod and an outer tube sleeved outside the inner tube. One end of the outer tube is inserted and fixed inside the first sleeve section, and one end of the inner tube protrudes from the outer tube and is inserted and fixed inside the second sleeve section. The other end of the outer tube is inserted and fixed inside the third sleeve section, and the other end of the inner tube protrudes from the outer tube and is inserted and fixed inside the fourth sleeve section.

[0011] Optionally, the connecting tube also includes a limiting member, which is located inside the outer tube and has a limiting hole, through which the inner tube passes.

[0012] Optionally, the first connecting tube includes a fixed tube and a locking connecting component. One end of the fixed tube is connected to the first simulated grid, and the locking connecting component is connected to the upper tube seat and the other end of the fixed tube, so that the locking connecting component can lock and unlock the upper tube seat and the fixed tube.

[0013] Optionally, the locking connection component includes a first retaining ring with a first locking protrusion on its outer peripheral surface; the upper tube seat has a locking hole with a notch in the hole wall for the first locking protrusion to pass through; the outer peripheral surface of the fixed tube has a first limiting protrusion, the fixed tube passes through the locking hole, the first limiting protrusion is located on the side of the upper tube seat facing the first simulated grid, and the first retaining ring is movably sleeved on the fixed tube and located on the side of the upper tube seat facing away from the first simulated grid, so that the first retaining ring can rotate relative to the fixed tube, thereby causing the first locking protrusion to be misaligned with the notch, and thus the upper tube seat and the fixed tube are fastened by the first limiting protrusion and the first locking protrusion.

[0014] Optionally, the locking connection component further includes a second retaining ring and an elastic element sleeved outside the fixed tube. The first limiting protrusion, the elastic element, the second retaining ring, and the first retaining ring are distributed sequentially along the axial direction of the fixed tube. The outer peripheral surface of the second retaining ring is provided with a second locking protrusion, which is located within a notch. The surface of the first locking protrusion facing the elastic element is provided with a first limiting structure, and the surface of the second locking protrusion facing away from the elastic element is provided with a second limiting structure. The first limiting structure and the second limiting structure cooperate to restrict the rotation of the first retaining ring.

[0015] Optionally, one of the first limiting structure and the second limiting structure is a protruding structure, and the other is a groove structure.

[0016] Optionally, the first connecting pipe is detachably connected to the first simulated grid.

[0017] Optionally, the upper tube socket module includes a second fastener, and the first analog grid is provided with a first connection hole, through which the second fastener passes and connects to the first connecting tube.

[0018] Optionally, the lower tube seat module includes a third fastener, and the lower tube seat is provided with a second connecting hole, through which the third fastener passes and connects to the second connecting tube.

[0019] Optionally, the second connecting hole has a locking groove on its wall, and the head of the third fastener has an expansion portion located in the second connecting hole. The expansion portion can form a protrusion for protruding into the locking groove, and the protrusion is used to insert into the locking groove.

[0020] Optionally, the second connecting pipe is detachably connected to the second simulated grid.

[0021] Optionally, the lower tube socket module includes a fourth fastener, and the second analog grid is provided with a third connecting hole. The fourth fastener passes through the third connecting hole and connects to the second connecting tube.

[0022] The nuclear fuel rod removal inspection simulation assembly provided in this application has at least one of the following technical effects: When in use, the nuclear fuel rod removal inspection simulation assembly can first be assembled by connecting the first connector, the second connector, and the third simulation grid, forming a through-hole through which the simulated fuel rod is inserted. Then, the two ends of the assembly are connected to the first simulation grid of the upper tube socket module and the second simulation grid of the lower tube socket module via corresponding first and second connectors, respectively, completing the overall assembly of the nuclear fuel rod removal inspection simulation assembly. During simulation exercises, the upper tube socket can be disassembled by separating the connection structure between the first connector and the upper tube socket; the simulated fuel rod can be removed from the accommodating hole through the first through-hole, completing the fuel rod removal simulation; after flipping the nuclear fuel rod removal inspection simulation assembly, the connection structure between the second connector and the lower tube socket can be disassembled, completing the lower tube socket disassembly simulation. The nuclear fuel rod removal inspection simulation component relies on a modular, split structure, eliminating the need to use simulated fuel assemblies in the spent fuel pool as a training platform. It can be used directly to conduct simulated rod removal inspection operations, thereby eliminating the need for hoisting the simulation component from the spent fuel pool to the repair pool, as well as auxiliary operations such as assembling long-handled tools, hoisting the simulation component, and dismantling long-handled tools. This shortens the auxiliary operation time on-site and improves the smoothness of nuclear power equipment drills and re-qualification tests. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a nuclear fuel rod removal inspection simulation assembly provided in some embodiments of this application.

[0025] Figure 2 for Figure 1 The diagram shows a disassembled assembly of a nuclear fuel rod removal inspection simulation.

[0026] Figure 3 for Figure 1 The diagram shows a structural schematic of a nuclear fuel rod removal inspection simulation assembly.

[0027] Figure 4 For along Figure 3 Sectional view along line AA in the middle.

[0028] Figure 5 for Figure 4 A magnified view of a section at point B in the middle.

[0029] Figure 6 for Figure 3 A schematic diagram of the connecting components in the diagram.

[0030] Figure 7 for Figure 6 A magnified view of a section at point F.

[0031] Figure 8 for Figure 4 A magnified view of a section at point C.

[0032] Figure 9 for Figure 4 A magnified view of a section at point D.

[0033] Figure 10 for Figure 3 A schematic diagram of the upper tube socket module.

[0034] Figure 11 for Figure 10 A magnified view of a section at point G.

[0035] Figure 12 for Figure 10 The diagram shown is an exploded view of the upper tube socket module.

[0036] Figure 13 for Figure 12 A schematic diagram of the structure of the first connecting pipe.

[0037] Figure 14 for Figure 13 The diagram shown is an exploded view of the first connecting pipe.

[0038] Figure 15 for Figure 10 A schematic diagram of the upper tube seat.

[0039] Figure 16 for Figure 4 A magnified view of a section at point E in the middle.

[0040] Figure 17 for Figure 3A schematic diagram of the lower tube socket module.

[0041] Figure 18 for Figure 17 The diagram shown is an exploded view of the lower tube socket module.

[0042] The following are the labeling elements in the figure: 100. Nuclear fuel rod removal inspection simulation assembly; 10. Simulated fuel rod; 20. Upper tube seat module; 21. Upper tube seat; 211. Locking hole; 2111. Notch; 22. First connecting tube; 221. Fixing tube; 2211. Fixing inner tube; 22111. Second limiting protrusion; 2212. Fixing outer tube; 22121. First limiting protrusion; 22122. First threaded hole; 22123. Pin; 222. Locking connection component; 2221. First retaining ring; 22211. First locking protrusion; 2 2212, First limiting structure; 2222, Second retaining ring; 22221, Second locking protrusion; 22222, Second limiting structure; 2223, Elastic element; 23, First simulated grid; 231, First through hole; 232, First connecting hole; 24, Second fastener; 25, First plate; 26, First edging piece; 27, Locking positioning plate; 271, Positioning hole; 272, Fourth through hole; 30, Lower tube seat module; 31, Lower tube seat; 311, Second connecting hole; 3111, Locking groove; 3 2. Second connecting pipe; 321. Second threaded hole; 322. Third threaded hole; 33. Second simulated grid; 331. Third through hole; 332. Third connecting hole; 34. Third fastener; 341. Expansion part; 35. Fourth fastener; 36. Second plate; 37. Second surrounding part; 40. Connecting assembly; 41. Third simulated grid; 411. Second through hole; 4111. First limiting plane; 42. Connecting module; 421. Connecting sub-pipe; 42101. Receiving hole; 4211. Inner pipe; 4 212. Outer tube; 4213. Limiting component; 42131. Limiting hole; 422. First connecting component; 42201. Second limiting plane; 4221. First body part; 42211. First body segment; 42212. Second body segment; 4222. First flange edge; 423. Second connecting component; 4231. Second body part; 42311. Third body segment; 42312. Fourth body segment; 4232. Second flange edge; 43. Third connecting pipe; 50. Sealing plate; 60. First fastener. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include at least one of that feature.

[0045] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "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 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 according to the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through 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. "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.

[0048] In the description of this application, it should be understood that the terms "inner", "outer", "side", "upper", "bottom", "front", "rear", etc., indicating the orientation or positional relationship 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.

[0049] In the description of this application, it should be noted that the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0050] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0051] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0052] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0053] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0054] A nuclear fuel assembly is a unit structure for loading nuclear fuel into a nuclear reactor. A nuclear fuel assembly includes fuel rods, an upper tube seat, a lower tube seat, positioning grids, and control rod guide tubes. The lower and upper tube seats serve as the bottom and top bases of the nuclear fuel assembly, respectively. Multiple control rod guide tubes are arranged vertically and securely connected at both ends to the lower and upper tube seats, forming the longitudinal load-bearing structure of the nuclear fuel assembly. Multiple layers of positioning grids are spaced apart along the axial direction of the control rod guide tubes and fixed to them, creating a multi-layered lateral support frame. Numerous fuel rods are arranged parallel to each other in independent grids within each layer of the positioning grid, equidistant from the control rod guide tubes, without nesting or contact. The lower tube seat bears the weight of the nuclear fuel assembly, evenly distributes the coolant flowing into the assembly, and filters foreign matter from the pipeline. The upper tube seat allows for the hoisting and transport of the nuclear fuel assembly, limits top swaying of the assembly, allows coolant outflow, and constrains the stroke of the control rod tips. The positioning grids use elastic structures to clamp the fuel rods, stabilizing the fuel rod spacing, buffering vibrations caused by coolant flow, and simultaneously regulating and guiding the coolant flow. The hollow control rod guide tube provides a channel for the vertical insertion and removal of the control rods, isolating the control rods from the fuel rods to prevent frictional damage. The fuel rods are encapsulated with zirconium alloy shells containing uranium dioxide pellets, which can seal and contain radioactive fission products, isolate the pellets from the cooling medium. The fuel rods, upper tube seat, lower tube seat, positioning grid, and control rod guide tubes are combined in the above connection method to form a complete rigid frame, stably maintaining the core geometry and ensuring effective fuel cooling and safe and controllable reactor operation.

[0055] like Figures 1-4 As shown, in some embodiments, the nuclear fuel rod removal inspection simulation assembly 100 includes a simulated fuel rod 10, an upper tube seat module 20, a lower tube seat module 30, and a connecting assembly 40; the upper tube seat module 20 includes an upper tube seat 21, a first connecting pipe 22, and a first simulated grid 23, one end of the first connecting pipe 22 is detachably connected to the upper tube seat 21, and the other end of the first connecting pipe 22 is connected to the first simulated grid 23; the lower tube seat module 30 includes a lower tube seat 31, a second connecting pipe 32, and a second simulated grid 33, one end of the second connecting pipe 32 is detachably connected to the lower tube seat 31, and the other end of the second connecting pipe 32 is connected to the second simulated grid 33; the connecting assembly 40 includes a plurality of connecting modules 42 and a third simulated grid 41 disposed between two adjacent connecting modules 42, each connecting module 42 including a connecting sub-pipe 421 and a connecting sub-pipe 421 disposed between the connecting sub-pipes 421 and the connecting sub-pipe 421. The first connector 422 and the second connector 423 at both ends of the sub-tube 421, and multiple connecting modules 42 are detachably connected to the third simulation grid 41 through the first connector 422 and the second connector 423, so that the connecting sub-tubes 421 of the multiple connecting modules 42 are sequentially spliced ​​and connected to form a receiving hole 42101, and the simulated fuel rod 10 is inserted into the receiving hole 42101; the first connector 422 located at one end of the connecting assembly 40 is detachably connected to the first simulation grid 23, and the second connector 423 located at the other end of the connecting assembly 40 is detachably connected to the second simulation grid 33; the first simulation grid 23 is provided with a first through hole 231 for the simulated fuel rod 10 to pass through the receiving hole 42101; the end of the receiving hole 42101 facing the lower tube seat module 30 is provided with a sealing plate 50 to block the opening of the receiving hole 42101.

[0056] The structure of the simulated fuel rod 10 is roughly the same as that of the fuel rod in the nuclear fuel assembly, thus simulating the nuclear fuel rod in the nuclear fuel assembly.

[0057] The upper tube socket module 20 is used to simulate the upper functional unit of the nuclear fuel assembly. The upper tube socket module 20 includes an upper tube socket 21, a first connecting pipe 22, and a first simulated grid 23. The structure of the upper tube socket 21 can be roughly the same as the structure of the upper tube socket 21 in the nuclear fuel assembly to simulate the upper tube socket 21 in the nuclear fuel assembly. The structure of the first connecting pipe 22 can be roughly the same as the upper structure of the control rod guide tube. The first connecting pipe 22 is used to simulate a section of the control rod guide tube in the nuclear fuel assembly located between the upper tube socket 21 and the topmost positioning grid.

[0058] The detachable connection structure between the first connecting pipe 22 and the upper pipe seat 21 can meet the disassembly and assembly operations of the upper pipe seat 21 in the on-site simulation operation. The first simulation grid 23 can not only realize docking and assembly with the connecting component 40, but also provide a channel for the simulated fuel rod 10 to be inserted through the first through hole 231, which is suitable for the simulated operation scenario of fuel rod grabbing and releasing.

[0059] The lower tube socket module 30 is used to simulate the lower functional unit of a nuclear fuel assembly. The lower tube socket module 30 includes a lower tube socket 31, a second connecting pipe 32, and a second simulation grid 33. The structure of the lower tube socket 31 can be approximately the same as the structure of the lower tube socket 31 in the nuclear fuel assembly to simulate the lower tube socket 31 in the nuclear fuel assembly. The structure of the second connecting pipe 32 can be approximately the same as the structure of the lower part of the control rod guide tube. The second connecting pipe 32 is used to simulate a section of the control rod guide tube in the nuclear fuel assembly located between the lower tube socket 31 and the bottommost positioning grid.

[0060] The second connecting pipe 32 and the lower pipe seat 31 are detachably connected, allowing for the simulation of disassembly and assembly of the lower pipe seat 31. The second simulation grid 33 is used to connect the lower pipe seat module 30 to the end of the connecting component 40.

[0061] The first simulated grid 23 and the second simulated grid 33 can adopt a hollow or grid-like structure to facilitate connection with the first connecting pipe 22 and the second connecting pipe 32.

[0062] The connecting assembly 40 is the part that supports the simulated fuel rod 10, and the connecting assembly 40 adopts a modular splicing structure. The connecting assembly 40 includes a third simulated grid 41 and multiple connecting modules 42. The third simulated grid 41 is used to simulate the positioning grid in the middle of the nuclear fuel assembly. The third simulated grid 41 can adopt a hollow, grid-like structure, or a non-hollow flat plate structure.

[0063] Each connection module 42 includes a connection sub-tube 421, a first connector 422, and a second connector 423. The first connector 422 and the second connector 423 are respectively fixed to both ends of the connection sub-tube 421. Multiple connection modules 42 can be detachably assembled with the third simulation grid 41 through the first connector 422 and the second connector 423 at both ends. After assembly, each connection sub-tube 421 is sequentially spliced ​​to form a third connection tube 43. The inner hole of the third connection tube 43 forms a receiving hole 42101, which provides installation space for the simulated fuel rod 10.

[0064] After multiple connecting modules 42 are spliced ​​together, multiple first connecting pieces 422 and multiple second connecting pieces 423 are distributed alternately along the axial direction of the connecting sub-tube 421. The first connecting pieces 422 and the second connecting pieces 423 located at both ends are connected to the first simulation grid 23 and the second simulation grid 33, respectively, to realize the overall assembly of the upper tube seat module 20, the connecting assembly 40, and the lower tube seat module 30, thereby combining them into an integrated nuclear fuel rod removal inspection simulation assembly 100. In addition, if the connecting module 42 is damaged, it can also be replaced individually.

[0065] A sealing plate 50 is provided at the opening position of the receiving hole 42101 facing the lower pipe seat module 30. The sealing plate 50 can block the lower opening of the receiving hole 42101, thereby limiting the simulated fuel rod 10 within the receiving hole 42101, so that the simulated fuel rod 10 will not come out from the lower position of the third connecting pipe 43, which is suitable for the simulated working conditions where the simulated fuel rod 10 is placed vertically and taken out from the top.

[0066] In some examples, the detachable connection structure between the above components can adopt assembly forms such as bolt connection, snap-fit ​​assembly, quick-release connector, etc., which makes the disassembly and assembly process simple and does not require special complicated tooling.

[0067] In this embodiment of the nuclear fuel rod removal inspection simulation assembly 100, when in use, the connecting assembly 40 can be assembled by first connecting the first connector 422, the second connector 423 and the third simulation grid 41. The connecting sub-tubes 421 are spliced ​​to form a through receiving hole 42101, and the simulated fuel rod 10 is inserted into the receiving hole 42101. Then, the two ends of the connecting assembly 40 are respectively connected to the first simulation grid 23 of the upper tube seat module 20 and the second simulation grid 33 of the lower tube seat module 30 through the corresponding first connector 422 and second connector 423, to complete the overall assembly of the nuclear fuel rod removal inspection simulation assembly 100. During simulation exercises, the connection structure between the first connecting pipe 22 and the upper pipe seat 21 can be disassembled to simulate the disassembly and assembly of the upper pipe seat 21; the simulated fuel rod 10 can be removed from the receiving hole 42101 through the first through hole 231 to simulate the fuel rod removal; after flipping the nuclear fuel rod removal inspection simulation assembly 100, the connection structure between the second connecting pipe 32 and the lower pipe seat 31 can be disassembled to simulate the disassembly and assembly of the lower pipe seat 31. The nuclear fuel rod removal inspection simulation assembly 100 relies on a modular split structure, eliminating the need to use the simulated fuel assembly in the spent fuel pool as a training carrier. The nuclear fuel rod removal inspection simulation assembly 100 can be used directly to carry out rod removal inspection simulation operations, thereby eliminating the hoisting process of transporting the simulated assembly from the spent fuel pool to the repair pool, as well as auxiliary operations such as assembling long-handled tools, hoisting the simulated assembly, and disassembling long-handled tools. This shortens the auxiliary operation time on site and improves the smoothness of nuclear power equipment drills and re-qualification tests.

[0068] In some embodiments, the nuclear fuel rod removal inspection simulation component 100 can be used for underwater drills or water drills.

[0069] In some embodiments, the nuclear fuel rod removal test simulation component 100 can be stored in the nuclear fuel storage unit or fuel assembly transport container in the spent water pool, and can also be used for the grabbing and releasing operation test of fuel handling tools, as well as the straightness verification of the fuel assembly storage container.

[0070] See Figure 5As shown, in some embodiments, the first connector 422 includes a first body portion 4221 and a first flange edge portion 4222 surrounding the first body portion 4221, the first body portion 4221 being sleeved and fixed to one end of the connecting sub-tube 421; the second connector 423 includes a second body portion 4231 and a second flange edge portion 4232 surrounding the second body portion 4231, the second body portion 4231 being sleeved and fixed to the other end of the connecting sub-tube 421; the nuclear fuel rod removal inspection simulation assembly 100 also includes a first fastener 60, at the connection of two adjacent connecting sub-tubes 421, the first fastener 60 sequentially passes through the first flange edge portion 4222, the third simulation grid 41 and the second flange edge portion 4232, so that the first flange edge portion 4222 and the second flange edge portion 4232 clamp and fix the third simulation grid 41.

[0071] The first body part 4221 of the first connector 422 is installed at the end of the connecting sub-pipe 421 by a sleeve fixing method, and the first flange edge 4222 is arranged in a ring outside the first body part 4221; the second body part 4231 of the second connector 423 is also fixed to the other end of the connecting sub-pipe 421 by a sleeve fixing method, and the second flange edge 4232 is arranged in a ring outside the second body part 4231. The overall structure is symmetrical and regular, and is suitable for splicing and assembly conditions.

[0072] The first fastener 60 is a locking and fixing component for connecting the sub-pipe 421 and the third simulated grid 41. During assembly, the first fastener 60 can penetrate the overlapping first flange edge 4222, the third simulated grid 41, and the second flange edge 4232, so that the first flange edge 4222 and the second flange edge 4232 clamp and fix the third simulated grid 41, thereby fixing the third simulated grid 41 to the ends of the two adjacent connecting sub-pipes 421, and thus completing the splicing and combination of multiple connecting sub-pipes 421.

[0073] In some examples, the first fastener 60 can be a conventional standard part such as a fastening bolt, a locking pin, or a combination fastening connector, which is suitable for the assembly and use scenarios of nuclear power simulation operations and has strong accessory versatility. The first body part 4221 and the connecting sub-tube 421, as well as the second body part 4231 and the connecting sub-tube 421, can be fixed by means of interference fit, adhesive fixation, screw locking, etc.

[0074] When using the nuclear fuel rod removal inspection simulation assembly 100, the first body part 4221 and the second body part 4231 are first fitted and fixed to both ends of the corresponding connecting sub-pipe 421. The first flange edge 4222 and the second flange edge 4232 are respectively attached to the opposite sides of the third simulation grid 41. After the assembly holes on the first flange edge 4222, the second flange edge 4232 and the third simulation grid 41 are aligned, they are locked by the first fastener 60, thus completing the splicing and assembly of multiple connecting modules 42. The entire connection structure is adapted to the requirements of modular rapid assembly and disassembly, and is suitable for repeated assembly and disassembly drills of simulated fuel assemblies.

[0075] By adopting the technical solution of this embodiment, the first set of body parts 4221 and the second set of body parts 4231 are used to fix the connecting sub-tubes 421, and the fasteners of the first flange edge 4222, the second flange edge 4232 and the third simulated grid 41 are locked. This allows for precise positioning of the splicing positions of multiple connecting sub-tubes 421, improving the coaxiality of each connecting sub-tube 421 after splicing, and ensuring that the receiving hole 42101 formed by the overall splicing is regular and smooth, thereby improving the coaxiality of the simulated fuel rod 10 within the receiving hole 42101. In addition, the flange-type docking and fastener-through locking assembly method simplifies the operation steps, eliminates the need for complex alignment and calibration procedures, and reduces the operational difficulty of module splicing.

[0076] See Figure 5 As shown, in some embodiments, the first body portion 4221 includes a first body segment 42211 and a second body segment 42212 connected together, and the second body portion 4231 includes a third body segment 42311 and a fourth body segment 42312 connected together. A first flange edge 4222 is provided on the outer peripheral surface of the first body segment 42211, and a second flange edge 4232 is provided on the outer peripheral surface of the third body segment 42311. The third simulated grid 41 is provided with a second through hole 411, and the second body segment 42212 and the fourth body segment 42312 pass through and connect in the second through hole 411 so that the connecting sub-pipes 421 of two adjacent connecting modules 42 are connected. The second through hole 411 can restrict the second body segment 42212 and the fourth body segment 42312 from rotating in the second through hole 411.

[0077] The first body part 4221 has a multi-segment structure, comprising a first body segment 42211 and a second body segment 42212 connected to each other, with a first flange edge 4222 surrounding the first body segment 42211. The outer diameters of the first body segment 42211 and the second body segment 42212 may be the same or different.

[0078] In some examples, the outer diameter of the first body segment 42211 is larger than the outer diameter of the second body segment 42212, so that a first step surface can be formed between the first body segment 42211 and the second body segment 42212. The first step surface can abut against the side of the third simulated grid 41, thereby limiting the depth of the first body segment 4221 inserted into the second through hole 411, thereby achieving axial positioning of the first body segment 4221 and the third simulated grid 41, which facilitates the assembly of the first connector 422 and the third simulated grid 41.

[0079] The second body section 4231 has a multi-segment structure, comprising a third body segment 42311 and a fourth body segment 42312 that are interconnected. The second flange edge 4232 is arranged around the third body segment 42311. The outer diameters of the third body segment 42311 and the fourth body segment 42312 may be the same or different.

[0080] In some examples, the outer diameter of the third body segment 42311 is larger than the outer diameter of the fourth body segment 42312, so that a second step surface can be formed between the third body segment 42311 and the fourth body segment 42312. The second step surface can abut against the side of the third simulated grid 41, thereby limiting the depth of the second body segment 4231 inserted into the second through hole 411, thereby achieving axial positioning of the second body segment 4231 and the third simulated grid 41, which facilitates the assembly of the second connector 423 and the third simulated grid 41.

[0081] The second through hole 411 can refer to the through hole of the third simulated grid 41. This through hole is used to accommodate the second set of body segments 42212 and the fourth set of body segments 42312. The second set of body segments 42212 and the fourth set of body segments 42312 can be inserted into the second through hole 411 from both sides of the third simulated grid 41 and complete the end docking of two adjacent connecting sub-tubes 421, so that the internal cavities of the two adjacent connecting sub-tubes 421 are interconnected, thereby continuing to form a complete and unobstructed receiving hole 42101 structure, which meets the usage requirements of the simulated fuel rod 10 through placement.

[0082] The second through hole 411 has a circumferential limiting structure, which can form a rotation constraint on the second body segment 42212 and the fourth body segment 42312 that pass through the second through hole 411, restricting the second body segment 42212 and the fourth body segment 42312 from rotating circumferentially within the second through hole 411, and fixing the circumferential assembly angle and relative position between the connecting sub-tube 421 and the third simulated grid 41.

[0083] In some examples, the second through hole 411 can adopt a structural form such as an irregular hole or a round hole with a limiting groove, which can be adapted to the external contour of the second body segment 42212 and the fourth body segment 42312 to stably achieve the circumferential anti-rotation limiting effect.

[0084] By adopting the technical solution of this embodiment, the second through hole 411 provides circumferential limiting for the second set of body segments 42212 and the fourth set of body segments 42312, enabling precise circumferential alignment and assembly of the connecting sub-tube 421 and the third simulation grid 41. This ensures that the connecting sub-tube 421 has good centering and positioning reference, effectively improving the overall straightness and centering accuracy of the nuclear fuel rod removal inspection simulation assembly 100 after the multi-segment connecting sub-tubes 421 are spliced ​​together, and improving the regularity of the receiving hole 42101. Furthermore, the second set of body segments 42212 and the fourth set of body segments 42312 are inserted into the second through hole 411 of the third simulation grid 41 and completed docking. The operation is simple, the assembly and alignment process is simple, and no additional calibration or auxiliary operation is required.

[0085] See Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, the wall of the second through hole 411 is provided with a first limiting plane 4111, and the second sleeve segment 42212 and the fourth sleeve segment 42312 are provided with a second limiting plane 42201 for abutting against the first limiting plane 4111.

[0086] The first limiting plane 4111 can refer to a section of plane formed on the inner wall of the second through hole 411, and the second limiting plane 42201 can refer to a section of plane set on the outer peripheral surface of the second sleeve segment 42212 or the fourth sleeve segment 42312. After the second sleeve segment 42212 and the fourth sleeve segment 42312 are inserted into the second through hole 411, the first limiting plane 4111 and the second limiting plane 42201 are set opposite to each other, forming a circumferential constraint on the second sleeve segment 42212 and the fourth sleeve segment 42312 inserted into the second through hole 411, restricting the second sleeve segment 42212 and the fourth sleeve segment 42312 from circumferentially rotating in the second through hole 411, thereby fixing the circumferential relative position of the connecting sub-tube 421 and the third simulated grid 41, and realizing the circumferential limiting and positioning of the assembly structure.

[0087] The number of first limiting planes 4111 can be flexibly adjusted, and one or more can be set according to actual assembly requirements.

[0088] In some examples, a first limiting plane 4111 can be arranged on each of the opposite sides of the second through hole 411, so that the second through hole 411 is roughly waist-shaped. The second body segment 42212 and the fourth body segment 42312 are respectively provided with two second limiting planes 42201. The second body segment 42212 and the fourth body segment 42312 are roughly flat structures, so that the first limiting plane 4111 can be arranged opposite to the second limiting plane 42201, thereby realizing the circumferential limiting and positioning of the assembly structure.

[0089] By adopting the technical solution of this embodiment, the limiting structure of the first limiting plane 4111 and the second limiting plane 42201 is used to achieve the limiting function based on the structure's own configuration, without the need for additional auxiliary limiting components, resulting in a simple overall structure. The alignment and limiting are achieved through the relative arrangement of the first limiting plane 4111 and the second limiting plane 42201, resulting in high structural fit accuracy and good assembly positioning accuracy. This ensures that the connecting sub-tube 421 has good centering and positioning reference, effectively improving the overall straightness and centering accuracy of the nuclear fuel rod removal inspection simulation assembly 100 after the multi-segment connecting sub-tubes 421 are assembled, and guaranteeing the regularity of the receiving hole 42101.

[0090] See Figure 4 As shown, in some embodiments, in the first connector 422 located at one end of the connecting assembly 40, the first flange edge 4222 can be directly connected to the first simulation grid 23 by fasteners. The second body segment 42212 is also inserted into the first through hole 231. The hole wall of the first through hole 231 is provided with a first limiting plane 4111, and the second body segment 42212 is also provided with a second limiting plane 42201. The first limiting plane 4111 and the second limiting plane 42201 are arranged opposite to each other to restrict the circumferential positioning of the connecting sub-tube 421 and the first simulation grid 23, so as to improve the overall straightness and centering accuracy of the entire nuclear fuel rod removal inspection simulation assembly 100.

[0091] See Figure 4 As shown, in some embodiments, in the second connector 423 located at the other end of the connecting assembly 40, the second flange edge 4232 can be directly connected to the second simulation grid 33 by fasteners. The second simulation grid 33 is provided with a third through hole 331, and the fourth body segment 42312 is also provided in the third through hole 331. The hole wall of the third through hole 331 is provided with a first limiting plane 4111, and the fourth body segment 42312 is also provided with a second limiting plane 42201. The first limiting plane 4111 and the second limiting plane 42201 are arranged opposite to each other to limit the circumferential positioning of the connecting sub-tube 421 and the second simulation grid 33, so as to improve the overall straightness and centering accuracy of the entire nuclear fuel rod removal inspection simulation assembly 100.

[0092] See Figure 4 As shown, in some embodiments, the sealing plate 50 is located at the end of the fourth body segment 42312 facing away from the third body segment 42311, and the sealing plate 50 is located inside the third through hole 331 to provide protection for the sealing plate 50.

[0093] See Figure 5 and Figure 8As shown, in some embodiments, the connecting tube 421 includes an inner tube 4211 for the simulated fuel rod 10 to pass through and an outer tube 4212 sleeved outside the inner tube 4211. One end of the outer tube 4212 is inserted and fixed inside the first sleeve segment 42211, and one end of the inner tube 4211 protrudes from the outer tube 4212 and is inserted and fixed inside the second sleeve segment 42212. The other end of the outer tube 4212 is inserted and fixed inside the third sleeve segment 42311, and the other end of the inner tube 4211 protrudes from the outer tube 4212 and is inserted and fixed inside the fourth sleeve segment 42312.

[0094] The connecting sub-tube 421 adopts a double-layer sleeve structure, including an inner tube 4211 and an outer tube 4212. The connecting sub-tube 421 serves as the main support for the simulated fuel rod 10. Among them, the inner tube 4211 is the direct receiving and passing structure for the simulated fuel rod 10. The inner holes of multiple connecting sub-tubes 4211 are joined together to form a receiving hole 42101.

[0095] The outer tube 4212 is nested outside the inner tube 4211. The two ends of the outer tube 4212 are respectively inserted and fixed inside the first set of body segments 42211 and the third set of body segments 42311, realizing the docking and positioning of the connecting sub-tube 421 with the first connecting member 422 and the second connecting member 423. The inner tube 4211 is nested inside the outer tube 4212, and the two ends of the inner tube 4211 protrude from the end face of the outer tube 4212, respectively, and are correspondingly inserted and fixed inside the second set of body segments 42212 and the fourth set of body segments 42312. This forms a layered assembly form in which the ends of the outer tube 4212 are fixed and the inner tube 4211 extends and docks. This assembly structure has good coaxiality, which is beneficial to improving the overall straightness and centering accuracy of the entire nuclear fuel rod removal inspection simulation assembly 100.

[0096] In some examples, the inner tube 4211 and the outer tube 4212 are arranged coaxially, which helps to improve the straightness of the splicing of multiple connecting sub-tubes 421.

[0097] The inner tube 4211 can be assembled with the corresponding second body segment 42212 and fourth body segment 42312, and the outer tube 4212 can be assembled with the corresponding first body segment 42211 and third body segment 42311 by means of interference fit, adhesive bonding, screw tightening, etc.

[0098] By adopting the technical solution of this embodiment, the connecting tube 421 adopts a double-layer sleeve structure, which can shield and protect the inner tube 4211 and the simulated fuel rod 10 through the outer tube 4212, thus providing good protection. At the same time, the inner tube 4211 can reduce the radial movement gap of the simulated fuel rod 10 inside the receiving hole 42101, reduce the radial offset of the simulated fuel rod 10, and make the state of the rod pulling simulation operation more in line with the real working conditions, thereby improving the accuracy of the rod pulling operation drill.

[0099] See Figure 4 and Figure 8 As shown, in some embodiments, the connecting sub-tube 421 further includes a limiting member 4213, which is disposed inside the outer tube 4212. The limiting member 4213 is provided with a limiting hole 42131, and the inner tube 4211 passes through the limiting hole 42131.

[0100] The limiting member 4213 can be an annular structure sleeved on the outer tube 4211. The limiting member 4213 is fixed in the inner cavity of the outer tube 4212, and a limiting hole 42131 is provided at the center of the limiting member 4213, through which the inner tube 4211 can pass.

[0101] The limiting hole 42131 can form a radial constraint on the inner tube 4211 that passes through it, limit the radial assembly position of the inner tube 4211 inside the outer tube 4212, restrict the relative assembly posture of the inner tube 4211 and the outer tube 4212, and reduce the radial offset and assembly deviation generated during the assembly process of the inner tube 4211 and the outer tube 4212.

[0102] In some examples, the limiting element 4213 can take the form of a ring-shaped positioning sleeve, a plate-type positioning spacer, etc., and can be fixed inside the outer tube 4212 by means of snap-fit, interference fit, or bonding. Multiple sets of limiting elements 4213 can be arranged at intervals along the axial direction of the outer tube 4212 to further improve the positioning stability of the entire sleeve structure.

[0103] By adopting the technical solution of this embodiment, the limiting member 4213 can effectively reduce the radial error after the inner tube 4211 and the outer tube 4212 are assembled, improve the coaxial assembly effect of the inner tube 4211 and the outer tube 4212, improve the overall straightness and centering accuracy of the entire nuclear fuel rod removal inspection simulation assembly 100 after assembly, and improve the regularity of the overall structure after the splicing of multiple sets of connecting modules 42.

[0104] See Figure 9 As shown, in some embodiments, the first connecting pipe 22 includes a fixed pipe 221 and a locking connecting component 222. One end of the fixed pipe 221 is connected to the first simulated grid 23, and the locking connecting component 222 is connected to the upper pipe seat 21 and the other end of the fixed pipe 221, so that the locking connecting component 222 can lock and unlock the upper pipe seat 21 and the fixed pipe 221.

[0105] The fixed tube 221 may refer to the tube body portion of the first connecting tube 22, and the locking connection component 222 may refer to the component used to connect the upper tube seat 21 and the first connecting tube 22. One end of the fixed tube 221 is connected to the first simulated grid 23, and the other end of the fixed tube 221 is connected to the upper tube seat 21 through the locking connection component 222, so as to realize the connection between the upper tube seat 21 and the first simulated grid 23.

[0106] The locking connection component 222 can be a controllable assembly locking structure. The locking connection component 222 can realize the locking and unlocking separation of the upper tube seat 21 and the fixed tube 221 through state switching to match the simulated working conditions of disassembling and assembling the upper tube seat 21.

[0107] When the upper tube seat 21 needs to be assembled, after aligning the ends of the upper tube seat 21 and the fixed tube 221, adjust the locking connection component 222 to switch to the locked state to complete the assembly and fixation of the upper tube seat 21 and the first connecting tube 22; when the upper tube seat 21 needs to be disassembled, switch the locking connection component 222 to the unlocked state to separate the upper tube seat 21 and the fixed tube 221, quickly complete the disassembly of the upper tube seat 21, and adapt to the operation requirements of the full-process rod pulling inspection simulation exercise.

[0108] In some examples, the locking connection component 222 can adopt a controllable locking structure such as a quick-release latch, a rotary locking joint, or a bolt locking assembly. The locking connection component 222 is easy to operate and can repeatedly complete the locking and unlocking switching actions, adapting to the needs of multiple drill operations.

[0109] By adopting the technical solution of this embodiment, the fixed pipe 221 and the upper pipe seat 21 are connected by a locking connection component 222. By switching the unlocking and locking states of the locking connection component 222, the disassembly and assembly of the upper pipe seat 21 and the fixed pipe 221 can be completed without the need for complex disassembly and assembly tools, which effectively simplifies the loading and unloading operation process of the upper pipe seat 21 and reduces the operational difficulty of on-site simulation operations.

[0110] See Figures 9-11 As shown, in some embodiments, the locking connection component 222 includes a first retaining ring 2221, the outer peripheral surface of which is provided with a first locking protrusion 22211; the upper tube seat 21 is provided with a locking hole 211, the hole wall of which is provided with a notch 2111 for the first locking protrusion 22211 to pass through; the outer peripheral surface of the fixing tube 221 is provided with a first limiting protrusion 22121, the fixing tube 221 passes through the locking hole 211, and the first limiting protrusion 22121... 21 is located on the side of the upper tube seat 21 facing the first simulated grid 23. The first retaining ring 2221 is movably sleeved on the fixed tube 221 and located on the side of the upper tube seat 21 facing away from the first simulated grid 23, so that the first retaining ring 2221 can rotate relative to the fixed tube 221, thereby causing the first locking protrusion 22211 to be misaligned with the notch 2111, and then locking the upper tube seat 21 and the fixed tube 221 by the first limiting protrusion 22121 and the first locking protrusion 22211.

[0111] The first retaining ring 2221 is movably fitted onto the outside of the fixed tube 221 and can rotate circumferentially relative to the fixed tube 221. The first locking protrusion 22211 is a limiting and locking structure located on the outer circumferential surface of the first retaining ring 2221. It rotates synchronously with the first retaining ring 2221 and is used to cooperate with the notch 2111 to complete the alignment, insertion, and misalignment locking actions.

[0112] The locking hole 211 is a through hole of the upper tube seat 21, through which the fixing tube 221 can pass, realizing the alignment and sleeve connection between the upper tube seat 21 and the fixing tube 221. The notch 2111 provided in the hole wall of the locking hole 211 is adapted to the first locking protrusion 22211. During the assembly and disassembly of the upper tube seat 21 and the fixing tube 221, the first locking protrusion 22211 can pass through the notch 2111, thereby realizing the quick assembly and disassembly of the upper tube seat 21.

[0113] The first limiting protrusion 22121 is a protruding structure on the outside of the fixed tube 221. After the upper tube seat 21 is assembled on the fixed tube 221, the first limiting protrusion 22121 is located on the side of the upper tube seat 21 facing the first simulated grid 23. It can form a one-sided axial limiting block on the upper tube seat 21. Together with the first retaining ring 2221 on the other side, it forms a two-way limiting structure to restrict the axial relative displacement between the upper tube seat 21 and the fixed tube 221.

[0114] The first retaining ring 2221 is assembled on the side of the upper tube seat 21 facing away from the first simulated grid 23, and is in a movable sleeve state with the fixed tube 221, allowing free circumferential rotation. The first locking protrusion 22211 is a protruding structure on the outer circumferential surface of the first retaining ring 2221.

[0115] When the first retaining ring 2221 rotates to a position where the first locking protrusion 22211 and the notch 2111 are offset from each other, the first locking protrusion 22211 can press against one side of the upper tube seat 21, and the first limiting protrusion 22121 is located on the other side of the upper tube seat 21. The first locking protrusion 22211 and the first limiting protrusion 22121 restrict the axial relative displacement between the upper tube seat 21 and the fixed tube 221, thereby achieving the locking of the upper tube seat 21 and the fixed tube 221.

[0116] When the upper tube seat 21 needs to be installed, first rotate the first retaining ring 2221 to align the first locking protrusion 22211 with the notch 2111. Then, fit the locking hole 211 of the upper tube seat 21 onto the end of the fixed tube 221. At the same time, the first locking protrusion 22211 passes through the notch 2111. After the first locking protrusion 22211 has completely passed through the notch 2111, rotate the first retaining ring 2221 to make the first locking protrusion 22211 and the notch 2111 offset from each other. At this time, the first limiting protrusion 22121 and the first retaining ring 2221 are located on opposite sides of the upper tube seat 21. The first locking protrusion 22211 and the first limiting protrusion 22121 restrict the axial relative displacement between the upper tube seat 21 and the fixed tube 221, thereby locking the upper tube seat 21 and the fixed tube 221.

[0117] When it is necessary to disassemble the upper tube seat 21, rotate the first retaining ring 2221 in the opposite direction so that the first locking protrusion 22211 is realigned with the notch 2111, thereby releasing the lock and separating the upper tube seat 21 from the fixed tube 221.

[0118] In some examples, one or more first locking protrusions 22211 may be provided, and the number of notches 2111 corresponds to and matches the number of first locking protrusions 22211 to adapt to different locking and positioning requirements.

[0119] By adopting the technical solution of this embodiment, the rotational locking structure in which the first locking protrusion 22211 and the notch 2111 cooperate can be used to switch between locking and unlocking the upper tube seat 21 and the fixed tube 221 by rotating the first retaining ring 2221. The operation process is simple and further simplifies the simulated operation steps of disassembling and assembling the upper tube seat 21.

[0120] See Figures 9-15 As shown, in some embodiments, the locking connection component 222 further includes a second retaining ring 2222 and an elastic member 2223 sleeved outside the fixed tube 221. The first limiting protrusion 22121, the elastic member 2223, the second retaining ring 2222 and the first retaining ring 2221 are distributed sequentially along the axial direction of the fixed tube 221. The outer peripheral surface of the second retaining ring 2222 is provided with a second locking protrusion 22221, which is located inside the notch 2111. The surface of the first locking protrusion 22211 facing the elastic member 2223 is provided with a first limiting structure 22212, and the surface of the second locking protrusion 22221 facing away from the elastic member 2223 is provided with a second limiting structure 22222. The first limiting structure 22212 and the second limiting structure 22222 cooperate to restrict the rotation of the first retaining ring 2221.

[0121] The second retaining ring 2222 can refer to an annular structure used to cooperate with the first retaining ring 2221, and the elastic element 2223 can refer to an elastic component used to push the second retaining ring 2222 against the first retaining ring 2221. The second retaining ring 2222 and the elastic element 2223 are both sleeved on the outside of the fixed tube 221. The first limiting protrusion 22121, the elastic element 2223, the second retaining ring 2222, and the first retaining ring 2221 are arranged sequentially along the axial direction of the fixed tube 221.

[0122] The second locking protrusion 22221 is a protruding structure on the outer circumferential surface of the second retaining ring 2222. After the upper tube seat 21 is assembled, the second retaining ring 2222 is located in the locking hole 211. The second locking protrusion 22221 is embedded in the notch 2111 of the locking hole 211, which can limit the circumferential position of the second retaining ring 2222 and constrain the circumferential position of the second retaining ring 2222.

[0123] The first limiting structure 22212 and the second limiting structure 22222 are mutually compatible interlocking limiting structures, respectively arranged on the relatively mating end faces of the first locking protrusion 22211 and the second locking protrusion 22221. The first limiting structure 22212 rotates synchronously with the first retaining ring 2221, and the second limiting structure 22222 is located at the notch 2111 with the second locking protrusion 22221, thereby keeping the second retaining ring 2222 and the second limiting structure 22222 in a fixed posture relative to the upper tube seat 21. The first limiting structure 22212 and the second limiting structure 22222 engage with each other, which can constrain the circumferential rotation of the first retaining ring 2221, thereby keeping the first retaining ring 2221 in a fixed posture relative to the upper tube seat 21.

[0124] In some examples, the first limiting structure 22212 and the second limiting structure 22222 can take the form of matching tooth structures, concave-convex locking structures, limiting step structures, etc., to adapt to the meshing and self-locking requirements. The elastic element 2223 can be an elastic component such as a spring or elastic washer, which can provide axial clamping force so that the first limiting structure 22212 and the second limiting structure 22222 can fit tightly together.

[0125] After the upper tube seat 21 is assembled, the second locking protrusion 22221 of the second retaining ring 2222 is embedded in the notch 2111 of the upper tube seat 21 to complete circumferential positioning. The first locking protrusion 22211 of the first retaining ring 2221 is staggered from the notch 2111, thereby locking the upper tube seat 21 and the fixed tube 221. When the upper tube seat 21 needs to be disassembled, the first retaining ring 2221 is rotated to the position where the first locking protrusion 22211 and the notch 2111 are opposite. Relying on the axial pressing action of the elastic element 2223, the first limiting structure 22212 and the second limiting structure 22222 are tightly engaged, realizing the self-locking limitation of the first retaining ring 2221, so as to reduce the mis-rotation of the first retaining ring 2221 and improve the smoothness of disassembling the upper tube seat 21.

[0126] By adopting the technical solution of this embodiment, the first retaining ring 2221 and the second retaining ring 2222 are engaged and matched with the elastic element 2223 and the first limiting structure 22212 and the second limiting structure 22222, respectively, to achieve the self-locking cooperation between the first retaining ring 2221 and the second retaining ring 2222. This can constrain the free rotation state of the first retaining ring 2221, so that the first locking protrusion 22211 of the first retaining ring 2221 can be accurately aligned with the notch 2111, thereby improving the stability of the locking connection component 222 in the unlocked state and facilitating the disassembly of the upper tube seat 21 by the staff.

[0127] See Figure 14 As shown, in some embodiments, one of the first limiting structure 22212 and the second limiting structure 22222 is a protruding structure and the other is a groove structure.

[0128] The protruding structure and the groove structure are respectively disposed on the relatively mating end faces of the first locking protrusion 22211 and the second locking protrusion 22221, forming a concave-convex meshing limiting fit structure; under the axial pressing action of the elastic member 2223, the protruding structure is embedded into the groove structure, so that the first limiting structure 22212 and the second limiting structure 22222 are fully meshed, locking the relative position of the first locking protrusion 22211 and the second locking protrusion 22221, thereby restricting the circumferential rotation of the first retaining ring 2221.

[0129] In some examples, the first limiting structure 22212 is set as a protruding structure and the second limiting structure 22222 is set as a groove structure, or the second limiting structure 22222 is set as a protruding structure and the first limiting structure 22212 is set as a groove structure. Both of these arrangements can achieve a stable meshing and locking effect, which is suitable for the layout requirements of the overall assembly structure.

[0130] By adopting the technical solution of this embodiment, the limiting structure of the protrusion structure and the groove structure with their concave-convex matching is used, eliminating the need for additional auxiliary limiting components and resulting in a simple overall structure. Relying on the precise meshing of the protrusion structure and the groove structure, the locking and positioning of the first locking protrusion 22211 and the second locking protrusion 22221 can be stably completed, reducing the possibility of the first retaining ring 2221 becoming loose or misrotating.

[0131] See Figure 9 , Figure 13 and Figure 14 As shown, in some embodiments, the fixing tube 221 includes a fixing inner tube 2211 and a fixing outer tube 2212. The fixing inner tube 2211 is inserted into the fixing outer tube 2212. One end of the fixing outer tube 2212 is connected to the first simulated grid 23. The end of the fixing inner tube 2211 facing the first simulated grid 23 and the fixing outer tube 2212 can be connected by a radially inserted pin 22123. The end of the fixing outer tube 2212 facing away from the first simulated grid 23 is inserted into the locking hole 211. A first limiting protrusion 22121 is provided on the outside of the fixing outer tube 2212. One end of 2211 facing away from the first simulated grid 23 extends out of the fixed outer tube 2212 and is provided with a second limiting protrusion 22111. The elastic element 2223, the second retaining ring 2222 and the first retaining ring 2221 are sequentially sleeved on the outside of the fixed inner tube 2211. The elastic element 2223, the second retaining ring 2222 and the first retaining ring 2221 are located between the second limiting protrusion 22111 and the first limiting protrusion 22121. The first retaining ring 2221 and the second retaining ring 2222 are axially positioned by the action of the first limiting protrusion 22121, the second limiting protrusion 22111 and the elastic element 2223 along the axial direction of the fixed tube 221.

[0132] See Figure 9 As shown, in some embodiments, the first connecting pipe 22 is detachably connected to the first simulated grid 23.

[0133] The first connecting pipe 22 and the first simulated grid 23 are assembled in a detachable manner.

[0134] In some examples, the first connecting pipe 22 and the first simulated grid 23 can be connected by bolts, snap-fit ​​joints, quick-release connectors or other detachable assembly methods. The disassembly and assembly process is simple, no special tooling is required, and it is convenient for quick disassembly and assembly on site.

[0135] In some examples, the fixed outer tube 2212 is detachably connected to the first simulated grid 23.

[0136] After repeated disassembly and reassembly of the upper tube seat 21 and rod removal drills, the nuclear fuel rod removal inspection simulation assembly 100 may suffer irreversible damage to the first connecting pipe 22, such as jamming of the locking connection component 222 or inability to tighten or loosen properly. Ultimately, this would render the nuclear fuel rod removal inspection simulation assembly 100 unusable. If the nuclear fuel rod removal inspection simulation assembly 100 is subjected to water removal for maintenance, it could also pose a radioactive contamination safety hazard. Currently, each unit is equipped with only one nuclear fuel rod removal inspection simulation assembly 100, and its damage would directly affect preventive maintenance work on overhaul and refueling equipment.

[0137] By adopting the technical solution of this embodiment, the first connecting pipe 22 can be detachably connected to both the upper pipe seat 21 and the first simulated grid 23. Thus, in scenarios where the first connecting pipe 22 experiences impact or structural damage during the disassembly and assembly drills of the lower pipe seat 31, the damaged first connecting pipe 22 can be removed from the upper pipe seat 21 and the first simulated grid 23. After removing the damaged component, a new first connecting pipe 22 can be installed, reducing the likelihood of jamming during drills. Furthermore, it eliminates the need to replace the entire nuclear fuel rod removal and inspection simulation assembly 100, improving the continuity of equipment drill operations and reducing the impact on preventative maintenance work on the overhaul and refueling equipment. Additionally, by utilizing the first connecting pipe 22 to simulate the control rod guide tube, its short length allows for rapid replacement should damage occur.

[0138] See Figure 9 As shown, in some embodiments, the upper tube socket module 20 includes a second fastener 24, the first simulated grid 23 is provided with a first connecting hole 232, and the second fastener 24 passes through the first connecting hole 232 and is connected to the first connecting tube 22.

[0139] The second fastener 24 can refer to a fastener used between the first simulated grid 23 and the first connecting pipe 22; the first connecting hole 232 is a through hole formed on the first simulated grid 23, extending through the first simulated grid 23 along its thickness direction. The second fastener 24 can pass through the first connecting hole 232 of the first simulated grid 23 and then be locked and fixed to the first connecting pipe 22, thereby achieving the connection between the first simulated grid 23 and the first connecting pipe 22. The second fastener 24 can be a fastening bolt, quick-release screw, or other fasteners.

[0140] In some examples, the end of the fixed outer tube 2212 is provided with a first threaded hole 22122. After the second fastener 24 passes through the first connecting hole 232, it is screwed into the first threaded hole 22122, thereby realizing the connection between the first simulated grid 23 and the first connecting tube 22. When disassembling, the second fastener 24 is screwed out of the first threaded hole 22122, thereby realizing the disassembly of the first simulated grid 23 and the first connecting tube 22.

[0141] By adopting the technical solution of this embodiment, when in use, the second fastener 24 is passed through the first connecting hole 232 of the first simulated grid 23 and locked and fixed with the first connecting pipe 22, thus completing the assembly connection between the first simulated grid 23 and the first connecting pipe 22; when the first connecting pipe 22 needs to be replaced, the second fastener 24 is removed, thus releasing the connection constraint between the first simulated grid 23 and the first connecting pipe 22, quickly completing the component replacement operation, and effectively improving the efficiency of the exercise.

[0142] See Figure 9 and Figure 12 As shown, in some embodiments, the upper tube seat module 20 includes a first plate 25, a first connecting hole 232 that passes through the first simulated grid 23 along the axial direction of the first connecting tube 22, and the first plate 25 is detachably connected to the side of the first simulated grid 23 away from the upper tube seat 21 and covers the first connecting hole 232.

[0143] The first connecting hole 232 extends through the first simulated grid 23 along the axial direction of the first connecting pipe 22, and the first connecting hole 232 is a through hole structure.

[0144] The first plate 25 is used to cover one side of the first simulated grid 23 facing away from the upper tube seat 21. The first plate 25 is fixed to the side of the first simulated grid 23 facing away from the upper tube seat 21. After the first plate 25 and the first simulated grid 23 are assembled, the first plate 25 can completely cover and shield the opening of the first connecting hole 232, thus blocking the second fastener 24 inside the first connecting hole 232. The shape of the first plate 25 is the same as the shape of the first simulated grid 23 to better protect the first simulated grid 23.

[0145] The first plate 25 is detachably connected to the first simulated grid 23, so that when the second fastener 24 needs to be disassembled or installed, the first connecting hole 232 can be exposed by disassembling the first plate 25, and the disassembly and installation of the second fastener 24 and the replacement of the first connecting pipe 22 can be carried out smoothly.

[0146] In some examples, the first plate 25 can be assembled using detachable methods such as bolt locking or snap fastening, which is convenient for disassembly and assembly and will not affect the daily maintenance of the second fastener 24 or the replacement of the first connecting pipe 22.

[0147] By adopting the technical solution of this embodiment, the first plate 25 can cover the first connecting hole 232, so that when the second fastener 24 falls off the first connecting pipe 22, the second fastener 24 will be blocked by the first plate 25 and will not fall off the nuclear fuel rod removal inspection simulation assembly 100.

[0148] See Figure 9 and Figure 12As shown, in some embodiments, the upper tube seat module 20 includes a first perimeter member 26, which is disposed at the edge of the first simulated grid 23 and located on the side of the first simulated grid 23 facing the upper tube seat 21.

[0149] The first edge member 26 can be a protective enclosure structure located at the edge of the first simulated grid 23. The first edge member 26 is arranged on the side of the first simulated grid 23 facing the upper tube seat 21, and the first edge member 26 is arranged along the edge of the first simulated grid 23 to form a surrounding enclosure structure.

[0150] In some examples, the first perimeter piece 26 may take the form of an integral perimeter plate, a segmented edge guard, or other structural forms, and be fixed to the edge of the first simulated grid 23 by means of welding, bolting, snap-fitting, or other methods.

[0151] For example, the first edge member 26 is a segmented edge, and a connecting plate is provided at the splice of two adjacent edge members. The connecting plate is connected to the two adjacent edge members to increase the structural strength of the first edge member 26.

[0152] The shape of the first edging piece 26 is adapted to the shape of the first simulated grid 23. For example, the first simulated grid 23 is a quadrilateral structure, and the first edging piece 26 is a quadrilateral ring structure.

[0153] By adopting the technical solution of this embodiment, the first perimeter 26 can effectively block components that fall onto the surface of the first simulated grid 23, avoid components falling outside the nuclear fuel rod removal inspection simulation assembly 100, reduce structural interference and operational impact caused by foreign objects falling in, and ensure the smooth conduct of the simulation exercise of the nuclear fuel rod removal inspection simulation assembly 100.

[0154] See Figure 9 and Figure 12 As shown, in some embodiments, the upper tube seat module 20 further includes a locking and positioning plate 27 disposed between the upper tube seat 21 and the first simulated grid 23. The number of first connecting tubes 22 is multiple, and the multiple first connecting tubes 22 are arranged at intervals. The locking and positioning plate 27 is provided with multiple positioning holes 271, and the multiple first connecting tubes 22 are correspondingly inserted into the multiple positioning holes 271.

[0155] The locking and positioning plate 27 is located between the upper tube seat 21 and the first simulated grid 23. The locking and positioning plate 27 has a plurality of spaced positioning holes 271 for the first connecting tubes 22 to pass through. One positioning hole 271 corresponds to one first connecting tube 22. The plurality of spaced first connecting tubes 22 simulate multiple control rod guide tubes.

[0156] By adopting the technical solution of this embodiment, multiple first connecting pipes 22 arranged at intervals are inserted into multiple positioning holes 271 of the locking positioning plate 27, which can position the assembly position of each first connecting pipe 22, effectively improving the overall positioning accuracy of multiple first connecting pipes 22 and improving the regularity and consistency of the assembly position of each first connecting pipe 22.

[0157] See Figure 9 and Figure 12 As shown, in some embodiments, the locking positioning plate 27 is provided with a fourth through hole 272, which is arranged opposite to the first through hole 231, so that after the upper tube seat 21 is disassembled, the simulated fuel rod 10 can be passed through the fourth through hole 272 to complete the rod pulling exercise.

[0158] See Figures 16-18 As shown, in some embodiments, the lower tube seat module 30 includes a third fastener 34, and the lower tube seat 31 is provided with a second connecting hole 311. The third fastener 34 passes through the second connecting hole 311 and is connected to the second connecting tube 32.

[0159] The third fastener 34 can refer to a fastener used to connect the lower tube seat 31 and the second connecting tube 32. The second connecting hole 311 can refer to a through hole in the lower tube seat 31. The third fastener 34 can pass through the second connecting hole 311 and be locked and fixed with the second connecting tube 32, thereby realizing the connection between the lower tube seat 31 and the second connecting tube 32. The third fastener 34 can be a fastening bolt, quick-release screw, or other fasteners.

[0160] In some examples, the end of the second connecting pipe 32 is provided with a second threaded hole 321. After the third fastener 34 passes through the second connecting hole 311, it is screwed into the second threaded hole 321, thereby realizing the connection between the lower pipe seat 31 and the second connecting pipe 32. When disassembling, the third fastener 34 is screwed out of the second threaded hole 321, which can realize the disassembly of the lower pipe seat 31 and the second connecting pipe 32.

[0161] By adopting the technical solution of this embodiment, the assembly structure of the third fastener 34 and the second connecting hole 311 has a small number of components, a simple structure, and concise assembly and disassembly steps. This structure can quickly release the assembly constraints between the lower tube seat 31 and the second connecting tube 32, facilitating the disassembly of the upper tube seat 21.

[0162] See Figures 16-18 As shown, in some embodiments, the wall of the second connecting hole 311 is provided with a locking groove 3111, and the head of the third fastener 34 is provided with an expansion portion 341 located in the second connecting hole 311. The expansion portion 341 can form a protrusion for protruding into the locking groove 3111, and the protrusion is used to insert into the locking groove 3111.

[0163] The expansion portion 341 can refer to an annular structure provided on the head of the third fastener 34. The annular structure is located inside the second connecting hole 311. The expansion portion 341 deforms and expands, and the periphery of the expansion portion 341 can protrude outward to form a protrusion.

[0164] The locking groove 3111 can refer to the groove structure provided on the hole wall of the second connecting hole 311; the expansion part 341 protrudes outward to form a protrusion, which can be embedded in the locking groove 3111, thereby realizing the locking and fixing of the third fastener 34 and the lower tube seat 31, and improving the stability of the fixing of the lower tube seat 31 and the second connecting tube 32.

[0165] In some examples, the locking groove 3111 can be arranged in a ring or at intervals along the wall of the second connecting hole 311 to adapt to different expansion and locking requirements. The expansion part 341 can take the form of elastic expansion structure, plastic expansion structure, etc., and can repeatedly complete the expansion and contraction reset action to adapt to the usage scenario of simulating multiple disassembly and assembly drills of components.

[0166] By adopting the technical solution of this embodiment, during use, the expansion portion 341 of the head of the third fastener 34 is bulged and deformed, causing the protrusion formed by the expansion portion 341 to embed into the locking groove 3111 inside the wall of the second connecting hole 311, thus completing the bulging and locking assembly of the third fastener 34. When it is necessary to remove the third fastener 34, the expansion portion 341 is controlled to contract and reset, causing the protrusion to disengage from the locking groove 3111, thereby releasing the locking constraint and smoothly removing the third fastener 34, completing the disassembly operation of the lower tube seat module 30. In this way, the disassembly and assembly of the lower tube seat 31 and the removal and bulging of the third fastener 34 are realized.

[0167] See Figures 16-18 As shown, in some embodiments, the second connecting pipe 32 is detachably connected to the second simulated grid 33.

[0168] The second connecting pipe 32 and the second simulated grid 33 are assembled in a detachable manner.

[0169] In some examples, the second connecting pipe 32 and the second simulated grid 33 can be connected by bolts, snap-fit ​​joints, quick-release connectors or other detachable assembly methods. The disassembly and assembly process is simple, no special tooling is required, and it is convenient for quick disassembly and assembly on site.

[0170] After repeated disassembly and assembly of the lower tube seat 31 and rod removal drills, the nuclear fuel rod removal inspection simulation component 100 may suffer irreversible damage to the second connecting pipe 32 and the lower tube seat 31, such as damage to the hole structure connecting the lower tube seat 31 and the second connecting pipe 32; ultimately rendering the nuclear fuel rod removal inspection simulation component 100 unusable.

[0171] By adopting the technical solution of this embodiment, the second connecting pipe 32 can be detachably connected to both the lower pipe seat 31 and the second simulated grid 33. Thus, in scenarios where the second connecting pipe 32 suffers impact or structural damage during the disassembly and assembly drills of the lower pipe seat 31, the damaged second connecting pipe 32 can be removed from the lower pipe seat 31 and the second simulated grid 33. After removing the damaged component, a new second connecting pipe 32 can be installed, or a new lower pipe seat 31 can be replaced. This eliminates the need to replace the entire nuclear fuel rod removal and inspection simulation assembly 100, improving equipment maintenance convenience and drill continuity, and reducing the impact on preventative maintenance work on overhaul and refueling equipment. Furthermore, since the second connecting pipe 32 is used to simulate the control rod guide tube, its short length allows for quick replacement should it be damaged.

[0172] See Figures 16-18 As shown, in some embodiments, the lower tube seat module 30 includes a fourth fastener 35, and the second simulated grid 33 is provided with a third connecting hole 332. The fourth fastener 35 passes through the third connecting hole 332 and is connected to the second connecting tube 32.

[0173] The fourth fastener 35 can refer to a fastener used between the second simulated grid 33 and the second connecting pipe 32; the third connecting hole 332 is a through hole formed on the second simulated grid 33, extending through the second simulated grid 33 along its thickness direction. The fourth fastener 35 can pass through the third connecting hole 332 of the second simulated grid 33 and be locked and fixed to the second connecting pipe 32, thereby achieving the connection between the second simulated grid 33 and the second connecting pipe 32. The fourth fastener 35 can be a fastening bolt, quick-release screw, or other fasteners.

[0174] In some examples, the end of the second connecting pipe 32 is provided with a third threaded hole 322. After the fourth fastener 35 passes through the third connecting hole 332, it is screwed into the third threaded hole 322, thereby realizing the connection between the second simulated grid 33 and the second connecting pipe 32. When disassembling, the fourth fastener 35 is screwed out of the third threaded hole 322, which can realize the disassembly of the second simulated grid 33 and the second connecting pipe 32.

[0175] By adopting the technical solution of this embodiment, when in use, the fourth fastener 35 is passed through the third connecting hole 332 of the second simulated grid 33 and locked and fixed with the second connecting pipe 32, thus completing the assembly connection between the second simulated grid 33 and the second connecting pipe 32; when the second connecting pipe 32 needs to be replaced, the fourth fastener 35 is removed, thus releasing the connection constraint between the second simulated grid 33 and the second connecting pipe 32, quickly completing the component replacement operation, and effectively improving the equipment maintenance efficiency.

[0176] In some embodiments, the lower tube seat module 30 includes a second plate 36, and a third connecting hole 332 extends through the second simulated grid 33 along the axial direction of the second connecting tube 32. The second plate 36 is detachably connected to the side of the second simulated grid 33 facing away from the lower tube seat 31 and shields the third connecting hole 332.

[0177] The third connecting hole 332 extends through the second simulated grid 33 along the axial direction of the second connecting pipe 32, and the third connecting hole 332 is a through hole structure.

[0178] The second plate 36 is used to cover one side of the second simulated grid 33 facing away from the lower tube seat 31. The second plate 36 is fixed to the side of the second simulated grid 33 facing away from the lower tube seat 31. After assembly, the second plate 36 completely covers and shields the opening of the third connecting hole 332, thus blocking the fourth fastener 35 inside the third connecting hole 332. The shape of the second plate 36 is the same as that of the second simulated grid 33 to better protect the second simulated grid 33.

[0179] The second plate 36 is detachably connected to the second simulated grid 33, so that when the fourth fastener 35 needs to be disassembled and maintained, the third connecting hole 332 can be exposed by disassembling the second plate 36, and the disassembly and assembly of the fourth fastener 35 and the replacement of the second connecting pipe 32 can be carried out smoothly.

[0180] In some examples, the second plate 36 can be assembled using detachable methods such as bolt locking or snap fastening, which is convenient for disassembly and assembly and will not affect the daily maintenance and spare parts replacement of the fourth fastener 35.

[0181] By adopting the technical solution of this embodiment, the second plate 36 can cover the third connecting hole 332, so that when the fourth fastener 35 falls off the second connecting pipe 32, the fourth fastener 35 is blocked by the second plate 36 and will not fall off the nuclear fuel rod removal inspection simulation assembly 100.

[0182] See Figures 16-18 As shown, in some embodiments, the lower tube seat module 30 includes a second perimeter member 37, which is disposed at the edge of the second simulated grid 33 and located on the side of the second simulated grid 33 opposite to the lower tube seat 31.

[0183] The second perimeter element 37 can be a protective enclosure structure located at the edge of the second simulated grid 33. The second perimeter element 37 is arranged on the side of the second simulated grid 33 away from the lower tube seat 31, and the second perimeter element 37 is arranged along the edge of the second simulated grid 33 to form a surrounding enclosure structure.

[0184] In some examples, the second perimeter piece 37 may take the form of an integral perimeter plate, a segmented edge guard, or other structural forms, and be fixed to the edge of the second simulated grid 33 by means of welding, bolting, snap-fitting, or other methods.

[0185] The shape of the second edging member 37 is adapted to the shape of the second simulated grid 33. For example, the second simulated grid 33 is a quadrilateral structure, and the second edging member 37 is a quadrilateral ring structure.

[0186] By adopting the technical solution of this embodiment, the second perimeter 37 can effectively block components that fall onto the surface of the second simulation grid 33, avoid components falling outside the nuclear fuel rod removal inspection simulation assembly 100, reduce structural interference and operational impact caused by foreign objects falling in, and ensure that the simulation exercise of the nuclear fuel rod removal inspection simulation assembly 100 is carried out smoothly.

[0187] In some embodiments, the nuclear fuel rod removal inspection simulation component 100 can eliminate the potential for jamming of the locking connection component 222 and the third fastener 34 of the lower tube seat 31 and the second connecting pipe 32 by replacing components. Furthermore, water can be used for rapid handling in the event of a jamming fault. The nuclear fuel rod removal inspection simulation component 100 supports rapid assembly and disassembly and can be flexibly transferred between units at the base. Its modular design facilitates transportation and storage, effectively improving operational efficiency and safety. The nuclear fuel rod removal inspection equipment can rely on the nuclear fuel rod removal inspection simulation component 100 to conduct functional re-evaluation and related tests, completing a full-process operational drill involving the disassembly and assembly of the upper tube seat 21, tightening and loosening of the locking connection component 222, replacement of nuclear fuel rods, disassembly and assembly of the lower tube seat 31, and the removal and bulging of the third fastener 34 of the lower tube seat 31.

[0188] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A nuclear fuel rod removal inspection simulation assembly, characterized in that, include: Simulated fuel rods; The upper tube socket module includes an upper tube socket, a first connecting tube, and a first simulated grid. One end of the first connecting tube is detachably connected to the upper tube socket, and the other end of the first connecting tube is connected to the first simulated grid. The lower tube socket module includes a lower tube socket, a second connecting pipe, and a second simulated grid frame. One end of the second connecting pipe is detachably connected to the lower tube socket, and the other end of the second connecting pipe is connected to the second simulated grid frame. A connecting assembly includes multiple connecting modules and a third simulated grid disposed between two adjacent connecting modules. Each connecting module includes a connecting sub-tube and a first connector and a second connector at both ends of the connecting sub-tube. The multiple connecting modules are detachably connected to the third simulated grid through the first connector and the second connector, so that the connecting sub-tubes of the multiple connecting modules are sequentially spliced ​​and connected to form a receiving hole, and the simulated fuel rod is inserted into the receiving hole. The first connector located at one end of the connecting assembly is detachably connected to the first simulated grid, and the second connector located at the other end of the connecting assembly is detachably connected to the second simulated grid. The first simulation grid is provided with a first through hole for the simulated fuel rod to pass through the receiving hole; the end of the receiving hole facing the lower tube seat module is provided with a sealing plate to block the opening of the receiving hole.

2. The nuclear fuel rod removal inspection simulation assembly according to claim 1, characterized in that: The first connector includes a first body portion and a first flange portion surrounding the first body portion, wherein the first body portion is sleeved and fixed to one end of the connecting sub-tube. The second connector includes a second body portion and a second flange portion surrounding the second body portion, wherein the second body portion is sleeved and fixed to the other end of the connecting sub-tube; The nuclear fuel rod removal inspection simulation assembly also includes a first fastener. At the connection of two adjacent connecting sub-tubes, the first fastener passes sequentially through the first flange edge, the third simulation grid, and the second flange edge, so that the first flange edge and the second flange edge clamp and fix the third simulation grid.

3. The nuclear fuel rod removal inspection simulation assembly according to claim 2, characterized in that: The first body part includes a first body segment and a second body segment connected together. The second body part includes a third body segment and a fourth body segment connected together. The first flange edge is provided on the outer peripheral surface of the first body segment, and the second flange edge is provided on the outer peripheral surface of the third body segment. The third simulation grid is provided with a second through hole, through which the second sleeve segment and the fourth sleeve segment pass and connect, so that the connecting sub-tubes of two adjacent connecting modules are connected. The second through hole can restrict the rotation of the second sleeve segment and the fourth sleeve segment within the second through hole.

4. The nuclear fuel rod removal inspection simulation assembly according to claim 3, characterized in that: The second through hole has a first limiting plane on its wall, and the second sleeve segment and the fourth sleeve segment have a second limiting plane for abutting against the first limiting plane.

5. The nuclear fuel rod removal inspection simulation assembly according to claim 3, characterized in that: The connecting tube includes an inner tube for the simulated fuel rod to pass through and an outer tube sleeved outside the inner tube. One end of the outer tube is inserted and fixed inside the first sleeve section, and one end of the inner tube protrudes from the outer tube and is inserted and fixed inside the second sleeve section. The other end of the outer tube is inserted and fixed inside the third sleeve section, and the other end of the inner tube protrudes from the outer tube and is inserted and fixed inside the fourth sleeve section.

6. The nuclear fuel rod removal inspection simulation assembly according to claim 5, characterized in that: The connecting tube also includes a limiting member, which is disposed inside the outer tube and has a limiting hole, through which the inner tube passes.

7. The nuclear fuel rod removal inspection simulation assembly according to any one of claims 1 to 6, characterized in that: The first connecting tube includes a fixed tube and a locking connecting component. One end of the fixed tube is connected to the first simulated grid, and the locking connecting component connects the upper tube seat and the other end of the fixed tube, so that the locking connecting component can lock and unlock the upper tube seat and the fixed tube.

8. The nuclear fuel rod removal inspection simulation assembly according to claim 7, characterized in that: The locking connection component includes a first retaining ring with a first locking protrusion on its outer peripheral surface; the upper tube seat has a locking hole with a notch in the hole wall for the first locking protrusion to pass through; the outer peripheral surface of the fixed tube has a first limiting protrusion, the fixed tube passes through the locking hole, the first limiting protrusion is located on the side of the upper tube seat facing the first simulated grid, and the first retaining ring is movably sleeved on the fixed tube and located on the side of the upper tube seat facing away from the first simulated grid, so that the first retaining ring can rotate relative to the fixed tube, thereby causing the first locking protrusion to be misaligned with the notch, and thus locking the upper tube seat and the fixed tube by the first limiting protrusion and the first locking protrusion.

9. The nuclear fuel rod removal inspection simulation assembly according to claim 8, characterized in that: The locking connection component further includes a second retaining ring and an elastic element sleeved outside the fixed tube. The first limiting protrusion, the elastic element, the second retaining ring, and the first retaining ring are distributed sequentially along the axial direction of the fixed tube. The outer peripheral surface of the second retaining ring is provided with a second locking protrusion, which is located within the notch. The surface of the first locking protrusion facing the elastic element is provided with a first limiting structure, and the surface of the second locking protrusion facing away from the elastic element is provided with a second limiting structure. The first limiting structure and the second limiting structure cooperate to restrict the rotation of the first retaining ring.

10. The nuclear fuel rod removal inspection simulation assembly according to claim 9, characterized in that: One of the first limiting structure and the second limiting structure is a protruding structure, and the other is a groove structure.

11. The nuclear fuel rod removal inspection simulation assembly according to any one of claims 1 to 6, characterized in that: The first connecting pipe is detachably connected to the first simulated grid.

12. The nuclear fuel rod removal inspection simulation assembly according to claim 11, characterized in that: The upper tube seat module includes a second fastener. The first simulated grid frame is provided with a first connecting hole, and the second fastener passes through the first connecting hole and connects to the first connecting tube.

13. The nuclear fuel rod removal inspection simulation assembly according to any one of claims 1 to 6, characterized in that: The lower tube seat module includes a third fastener, and the lower tube seat is provided with a second connecting hole. The third fastener passes through the second connecting hole and is connected to the second connecting tube.

14. The nuclear fuel rod removal inspection simulation assembly according to claim 13, characterized in that: The second connecting hole has a locking groove on its wall, and the head of the third fastener has an expansion portion located in the second connecting hole. The expansion portion can form a protrusion for protruding into the locking groove, and the protrusion is used to insert into the locking groove.

15. The nuclear fuel rod removal inspection simulation assembly according to any one of claims 1 to 6, characterized in that: The second connecting pipe is detachably connected to the second simulated grid.

16. The nuclear fuel rod removal inspection simulation assembly according to claim 15, characterized in that: The lower tube seat module includes a fourth fastener, and the second simulated grid is provided with a third connecting hole. The fourth fastener passes through the third connecting hole and is connected to the second connecting tube.

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