A dry storage container for spent fuel loading interference inspection tool

Abstract

The present invention belongs to the technical field of dry storage of spent nuclear fuel in nuclear power plants, and particularly relates to an interference inspection tool for loading a dry storage container for spent nuclear fuel. Before loading the spent nuclear fuel into the sealed storage container, interference inspection can be carried out by using an interference inspection tool for loading a dry storage container for spent nuclear fuel provided by the embodiments of the present application, which can avoid the collision between the loading manipulator and the fixing screw of the storage grid inside the storage container after entering the spent fuel pool and prevent the occurrence of safety accidents.

Description

Technical Field

[0001] This application belongs to the technical field of dry storage of spent fuel in nuclear power plants, and particularly relates to an interference inspection tool for loading a dry storage container of spent fuel. Background Art

[0002] During the continuous power generation operation of a nuclear power plant, spent fuel assemblies are continuously generated. However, the volume of the spent fuel pool built during the initial construction of the nuclear power plant for storing spent fuel is limited. To ensure the normal operation of the nuclear power plant unit, the nuclear power plant needs to regularly transfer the spent fuel assemblies burned in the spent fuel pool out, so that there is enough volume in the spent fuel pool for storing newly generated spent fuel.

[0003] Relatively mature methods for spent fuel storage include two types: dry method and wet method. Currently, domestic nuclear power plants mainly use the dry storage operation process of spent fuel to store spent fuel assemblies by dry method. After placing the transfer container equipped with a sealed storage container at the bottom of the spent fuel pool, the manipulator of the refueling machine grabs the spent fuel assemblies in the spent fuel pool into the spent fuel storage grid inside the sealed storage container. After the transfer container is filled with spent fuel assemblies, it is sealed and transported to the concrete module by a transfer trailer for dry storage.

[0004] There are 6 storage grid fixing screws inside the sealed storage container for loading spent fuel assemblies. The top of the storage grid fixing screws is higher than the plane of the spent fuel storage grid and is relatively close to the edge storage grid. There may be a risk of interference and collision with the fixing screws during the vertical feeding process of the refueling machine's gripper manipulator, so there are relatively large potential safety hazards. Summary of the Invention

[0005] The purpose of this application is to provide an interference inspection tool for loading a dry storage container of spent fuel, so as to solve the problem of collision between the gripper manipulator with the material and the storage grid fixing screws during the loading process.

[0006] Technical solutions for achieving the purpose of this application:

[0007] An embodiment of this application provides an interference inspection tool for loading a dry storage container of spent fuel. The inspection tool includes: a base and an inspection component;

[0008] The base is used to be installed on the spent fuel storage grid;

[0009] The inspection component is rotatably fixed on the base and is used to simulate the working range of the manipulator during loading to detect the interference between the storage grid fixing screws on the spent fuel storage grid and the manipulator.

[0010] Optionally, the base is divided into upper and lower layers;

[0011] The lower layer of the base is a hexagonal structure for placement inside the spent fuel storage rack;

[0012] The upper layer of the base is a cylindrical structure for fixing the inspection assembly;

[0013] Optionally,

[0014] The diameter of the cylindrical structure is greater than the diameter of the circumcircle of the hexagonal structure.

[0015] Optionally,

[0016] A square groove is provided at the center of the upper surface of the cylindrical structure for fixing the inspection assembly.

[0017] Optionally, the inspection assembly includes: a rotating shaft, a horizontal connecting rod, and at least one vertical connecting rod;

[0018] One end of the rotating shaft is fixed inside the square groove, and the other end of the rotating shaft is installed on the horizontal connecting rod;

[0019] The horizontal connecting rod can rotate around the base, and the length of the horizontal connecting rod is related to the working range of the manipulator;

[0020] The vertical connecting rod is fixed at one end of the horizontal connecting rod.

[0021] Optionally, the inspection assembly further includes: a bearing seat;

[0022] The bearing seat is fixed inside the square groove;

[0023] One end of the rotating shaft is rotatably installed on the bearing seat.

[0024] Optionally,

[0025] A long groove extending along the length direction of the horizontal connecting rod is milled in the middle of the horizontal connecting rod;

[0026] The other end of the rotating shaft is provided with a thread, and the other end of the rotating shaft passes through the long groove and is fixed by a nut.

[0027] Optionally,

[0028] The vertical connecting rod and the horizontal connecting rod are fixedly connected by an angle code.

[0029] Optionally,

[0030] The length of the vertical connecting rod is consistent with the height difference between the top of the fixing screw of the storage rack and the plane of the spent fuel storage rack.

[0031] Optionally,

[0032] The side lengths of the hexagonal structure are all 140 mm;

[0033] The diameter of the cylindrical structure is 290 mm; the hexagonal structure and the cylindrical structure are concentric.

[0034] The beneficial technical effects of this application are as follows:

[0035] (1) A tool for checking interference in loading a spent fuel dry storage container provided by an embodiment of this application. The lower layer of the base and the spent fuel storage grid are both hexagonal structures. The tool can be installed and removed conveniently and quickly, improving the efficiency of interference inspection work. The tool material is selected as polyethylene, and the overall mass of the tool is relatively light, reducing the labor intensity of workers during the work process;

[0036] (2) A tool for checking interference in loading a spent fuel dry storage container provided by an embodiment of this application has fewer components and is entirely covered above the storage grid. During the interference inspection process, the risk of parts falling to the bottom of the sealed storage container can be effectively reduced, and the processing and assembly of parts are simple and the operation is convenient;

[0037] (3) A tool for checking interference in loading a spent fuel dry storage container provided by an embodiment of this application. The connecting bolt at the top of the rotating shaft is fixedly connected to the horizontal connecting rod. By loosening the connecting bolt at the top, the horizontal connecting rod moves along the direction of the long slot, and the interference inspection area can be adjusted according to the working space of different manipulators; the installation of the vertical connecting rod increases the inspection area in the vertical direction, and can effectively increase the reliability of the tool in interference inspection in the vertical direction;

[0038] (4) Before the sealed storage container loads spent fuel, interference inspection is carried out through a tool for checking interference in loading a spent fuel dry storage container provided by an embodiment of this application, which can avoid the collision between the loading manipulator and the fixing screw of the storage grid inside the storage container after entering the spent fuel pool, and avoid the occurrence of safety accidents. Description of the Drawings

[0039] Figure 1 It is a schematic structural diagram of an existing spent fuel sealed storage container;

[0040] Figure 2 It is a schematic structural diagram of a tool for checking interference in loading a spent fuel dry storage container provided by an embodiment of this application;

[0041] Figure 3 It is a schematic structural diagram of a base in a tool for checking interference in loading a spent fuel dry storage container provided by an embodiment of this application;

[0042] Figure 4 It is another schematic structural diagram of a base in a tool for checking interference in loading a spent fuel dry storage container provided by an embodiment of this application;

[0043] Figure 5 The structural schematic diagram of the horizontal connecting rod in a dry storage container loading interference inspection tool provided by an embodiment of the present application.

[0044] In the figure:

[0045] 1-Fuel storage and sealing container; 11-Fixed screw for storage grid, 12-Fuel storage grid;

[0046] 2-Base; 21-Lower layer; 22-Upper layer; 23-Square groove;

[0047] 3-Inspection component; 31-Rotating shaft; 32-Horizontal connecting rod; 33-Vertical connecting rod; 34-Bearing seat; 35-Long groove; 36-Nut; 37-Angle code. Detailed implementation manners

[0048] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the following described embodiments are only a part of the embodiments of the present application, rather than all. Based on the embodiments described in the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of protection of the present application.

[0049] As Figure 1 shown in the fuel storage and sealing container 1, there are 6 fixed screws 11 for the storage grid inside the fuel storage and sealing container 1 carrying the spent fuel assembly. The top of the fixed screw 11 for the storage grid is higher than the plane of the fuel storage grid 12 and is closer to the edge of the fuel storage grid 12. There may be a risk of interference and collision with the fixed screw 11 for the storage grid during the vertical feeding process of the manipulator of the refueling machine. Therefore, there are relatively large potential safety hazards.

[0050] For this reason, the embodiment of the present application provides a dry storage container loading interference inspection tool for spent fuel. Before the sealed storage container is loaded into the spent fuel pool, only the bottom of the interference inspection tool needs to be placed in the storage grid of the sealed storage container. When the tool is placed in the storage grid, by rotating the horizontal connecting rod and observing whether the vertical connecting rod will collide with the fixed screw of the storage grid of the sealed storage container during the rotation process, it is possible to prevent the manipulator from colliding with the fixed screw during the loading process after entering the spent fuel pool, effectively reducing the occurrence of safety accidents and ensuring the safety of the corresponding personnel and equipment. Adjust the rotation radius of the horizontal connecting rod according to the working area during the vertical feeding process of the manipulator.

[0051] Based on the above content, in order to clearly and detailedly illustrate the above advantages of the present application, the specific implementation manners of the present application will be described below with reference to the accompanying drawings.

[0052] See Figure 2, This figure is a schematic structural diagram of a tool for checking the interference during the loading of a dry storage container for spent fuel provided by an embodiment of the present application.

[0053] A tool for checking the interference during the loading of a dry storage container for spent fuel provided by an embodiment of the present application includes: a base 2 and an inspection assembly 3;

[0054] The base 2 is used to be installed on the spent fuel storage grid 12;

[0055] The inspection assembly 3 is rotatably fixed on the base 2 and is used to simulate the working range of the manipulator during loading to detect the interference between the fixing screw 11 of the storage grid on the spent fuel storage grid 12 and the manipulator.

[0056] In some possible implementation manners of the embodiment of the present application, as Figure 3 shown, the base 2 is divided into upper and lower layers;

[0057] The lower layer 21 of the base 2 is a hexagonal structure and is used to be placed inside the spent fuel storage grid 12;

[0058] The upper layer 22 of the base 2 is a cylindrical structure and is used to fix the inspection assembly 3;

[0059] In one example, the diameter of the cylindrical structure is greater than the diameter of the circumcircle of the hexagonal structure.

[0060] Specifically in implementation, the side length of the hexagonal structure can be 140 mm on average; the diameter of the cylindrical structure is 290 mm; the hexagonal structure and the cylindrical structure are concentric.

[0061] In some possible implementation manners of the embodiment of the present application, as Figure 4 shown, a square groove 23 is provided at the center position of the upper surface of the cylindrical structure for fixing the inspection assembly 3.

[0062] In some possible implementation manners of the embodiment of the present application, as Figure 1 shown, the inspection assembly 3 may specifically include: a rotating shaft 31, a horizontal connecting rod 32, and at least one vertical connecting rod 33;

[0063] One end of the rotating shaft 31 is fixed inside the square groove 23, and the other end of the rotating shaft 31 is installed on the horizontal connecting rod 32;

[0064] The horizontal connecting rod 32 can rotate around the base 2, and the length of the horizontal connecting rod 32 is related to the working range of the manipulator;

[0065] The vertical connecting rod 33 is fixed at one end of the horizontal connecting rod 32.

[0066] As an example, the vertical connecting rod 33 and the horizontal connecting rod 32 are fixedly connected through an angle code 37.

[0067] In one example, the inspection component 3 further includes: a bearing housing 34;

[0068] The bearing housing 34 is fixed inside the square groove 23;

[0069] One end of the rotating shaft 31 is rotatably mounted on the bearing housing 34.

[0070] It can be understood that the horizontal connecting rod 32 is fixed to the rotating shaft 31 through a nut, and then the rotating shaft 31 rotates on the bearing housing 34.

[0071] In some possible implementation manners of the embodiments of the present application, as Figure 5 shown, a long groove 35 extending along the length direction of the horizontal connecting rod 32 is milled in the middle of the horizontal connecting rod 32;

[0072] The other end of the rotating shaft 31 is provided with a thread, and the other end of the rotating shaft 31 passes through the long groove 35 and is fixed by a nut 36.

[0073] It can be understood that during specific implementation, according to the working area radius during the loading process of the manipulator, the nut 36 can be loosened so that the horizontal connecting rod 32 can slide on the rotating shaft 31 along the long groove 35, and thus the rotation radius of a fuel dry storage container loading interference inspection tool provided by the embodiments of the present application can be adjusted according to the working area of the manipulator.

[0074] In some possible implementation manners of the embodiments of the present application, the length of the vertical connecting rod 33 is kept consistent with the height difference between the top of the storage grid fixing screw 11 and the plane of the spent fuel storage grid 12 to detect the risk of interference and collision with the storage grid fixing screw 11 that may exist in the working area during the vertical loading process of the refueling machine gripper manipulator.

[0075] Next, a specific example is combined to detail the installation and use method of a fuel dry storage container loading interference inspection tool provided by the embodiments of the present application.

[0076] The installation and use steps of a fuel dry storage container loading interference inspection tool provided by the embodiments of the present application are divided into the following stages:

[0077] 1) Assemble the bearing housing 34 and the rotating shaft 31;

[0078] 2) Install the assembled bearing housing 34 in the square groove 23 of the base 2;

[0079] 3) Install the horizontal connecting rod 32 on the rotating shaft 31 through an inner hexagon bolt;

[0080] 4) Install the vertical connecting rod 33 at both ends of the horizontal connecting rod 32 through angle brackets 37 bolts and nuts;

[0081] 5) Adjust the rotation radius of the horizontal connecting rod 32 according to the working area radius of the manipulator;

[0082] 6) After adjusting the radius, place the base 2 in the spent fuel storage grid 12 of the spent fuel sealed storage container 1;

[0083] 7) Rotate the horizontal connecting rod 32 to observe the interference between the vertical connecting rod 33 and the storage grid fixing screw 11;

[0084] 8) After the inspection, take out the base 2 and repeat operations 1-7 to conduct interference inspections on the other spent fuel storage grids 12 of the spent fuel sealed storage container 1;

[0085] 9) After overall inspection shows no interference, then place the transfer container containing the spent fuel sealed storage container 1 at the bottom of the spent fuel pool for manipulator loading.

[0086] The above has described the present application in detail in conjunction with the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can also be made without departing from the purpose of the present application. Contents not described in detail in the present application can all adopt the prior art.

Claims

1. A dry storage container loading interference inspection tool for spent fuel, characterized in that, the inspection tool includes: a base and an inspection component; the base is used to be installed on the spent fuel storage grid; the inspection component is rotatably fixed on the base and is used to simulate the working range of the manipulator during loading to detect the interference between the storage grid fixing screw on the spent fuel storage grid and the manipulator; the base is divided into upper and lower layers; the lower layer of the base is a hexagonal structure and is used to be placed inside the spent fuel storage grid; the upper layer of the base is a cylindrical structure and is used to fix the inspection component; the diameter of the cylindrical structure is larger than the circumcircle diameter of the hexagonal structure; a square groove is opened at the center position of the upper surface of the cylindrical structure and is used to fix the inspection component; the inspection component includes: a rotating shaft, a horizontal connecting rod and at least one vertical connecting rod; one end of the rotating shaft is fixed inside the square groove, and the other end of the rotating shaft is installed on the horizontal connecting rod; the horizontal connecting rod can rotate around the base, and the length of the horizontal connecting rod is related to the working range of the manipulator; the vertical connecting rod is fixed at one end of the horizontal connecting rod.

2. The dry storage container loading interference inspection tool for spent fuel according to claim 1, characterized in that, the inspection component further includes: a bearing seat; the bearing seat is fixed inside the square groove; one end of the rotating shaft is rotatably installed on the bearing seat.

3. The dry storage container loading interference inspection tool for spent fuel according to claim 2, characterized in that, a long groove extending along the length direction of the horizontal connecting rod is milled in the middle of the horizontal connecting rod; the other end of the rotating shaft is provided with a thread, and the other end of the rotating shaft passes through the long groove and is fixed by a nut.

4. The dry storage container loading interference inspection tool for spent fuel according to claim 1, characterized in that, the vertical connecting rod and the horizontal connecting rod are fixedly connected by an angle code.

5. The dry storage container loading interference inspection tool for spent fuel according to claim 4, characterized in that, the length of the vertical connecting rod is kept consistent with the height difference between the top of the storage grid fixing screw and the plane of the spent fuel storage grid.

6. The dry storage container loading interference inspection tool for spent fuel according to claim 1, characterized in that, the side lengths of the hexagonal structure are all 140 mm; the diameter of the cylindrical structure is 290 mm; the hexagonal structure and the cylindrical structure are concentric.

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