Spent fuel single-rod transportation grillwork and spent fuel transportation device

Abstract

The utility model provides a spent fuel single rod transportation grillwork which comprises a plurality of split type sleeve elements, each split type sleeve element is provided with a clamping groove used for limiting a spent fuel single rod, the adjacent split type sleeve elements are sequentially connected end to end in a butt joint mode, and after the split type sleeve elements are assembled together, the spent fuel single rod transportation grillwork is formed. And all the clamping grooves can form an accommodating space for embedding a spent fuel single rod. According to the spent fuel single-rod transportation grillwork, the multiple split type sleeve elements are assembled together, the containing space where the spent fuel single rods can be embedded is formed in the multiple split type sleeve elements, the containing space is used for limiting movement of the spent fuel single rods, and therefore the purpose that the spent fuel single rods are independently stored and transported through the spent fuel single-rod transportation grillwork is achieved. The utility model further provides a spent fuel transporting device which comprises the spent fuel single-rod transporting grillwork, and the spent fuel transporting device can store and transport a plurality of spent fuel single-rod transporting grillwork.

Description

Technical Field

[0001] This utility model belongs to the field of spent fuel rod transportation technology, and specifically relates to a spent fuel single rod transportation grid and spent fuel transportation device. Background Technology

[0002] Spent fuel is classified as a Class VII hazardous material, characterized by high radiation, high calorific value, and critical safety status. Typically, a spent fuel assembly consists of multiple spent fuel rods arranged in a matrix. The interior of each spent fuel rod is filled with metallic uranium and surrounded by zirconium tubes.

[0003] Currently, various specialized transport devices have been developed for transporting spent fuel assemblies. These devices contain multiple compartments, each capable of holding one spent fuel assembly, but cannot secure individual spent fuel rods. Since individual spent fuel rods share similar performance characteristics with spent fuel assemblies, including high radiation intensity and high calorific value, and considering the current legal and regulatory requirements for spent fuel transport in my country, as well as the safety and complexity of such transport, dedicated spent fuel transport containers are needed to fill the market gap for specialized containers for individual spent fuel rods.

[0004] Therefore, how to overcome the above-mentioned technical defects is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a spent fuel single-bar transport rack capable of storing and transporting spent fuel single bars individually. Another purpose of this invention is to provide a spent fuel transport device capable of storing and transporting multiple spent fuel single-bar transport racks.

[0006] To solve the above-mentioned technical problems, this utility model provides a spent fuel single rod transport grid, including multiple split sleeve elements. Each split sleeve element is provided with a slot for limiting the spent fuel single rod. Adjacent split sleeve elements are connected end to end in sequence. After multiple split sleeve elements are assembled together, all the slots can form a receiving space for embedding the spent fuel single rod.

[0007] Optionally, in the above-mentioned spent fuel single-bar transport grid, the accommodating space of the spent fuel single-bar transport grid is clearance-fitted with the spent fuel single bar.

[0008] Optionally, in the above-mentioned spent fuel single-bar transport grid, the plurality of the split-type sleeve elements include an upper clamp, a middle clamp, and a bottom clamp arranged sequentially from top to bottom.

[0009] Optionally, in the above-mentioned spent fuel single-bar transport grid, the grooves of the upper clamp and the bottom clamp are both conical grooves;

[0010] And / or, the groove of the central clamp is a cylindrical groove.

[0011] Optionally, in the above-mentioned spent fuel single-bar transport grid, the shape of the spent fuel single-bar transport grid is a cuboid or a polygonal column.

[0012] This utility model also provides a spent fuel transportation device, including a housing, a mounting frame disposed within the housing, and a spent fuel single-bar transport grid as described above. The mounting frame is provided with a plurality of mounting slots, and the spent fuel single-bar transport grid is disposed within the mounting slots.

[0013] Optionally, in the above-mentioned spent fuel transportation device, there are multiple mounting brackets, and the multiple mounting brackets are arranged at intervals within the housing;

[0014] And / or, the mounting bracket is made of honeycomb aluminum material;

[0015] And / or, the housing is made of stainless steel.

[0016] Optionally, in the above-mentioned spent fuel transportation device, the mounting frame is cylindrical, and the hollow cavity of the shell matches the shape of the mounting frame.

[0017] Optionally, in the above-mentioned spent fuel transportation device, the housing includes a cylindrical body with an end opening and a cover plate disposed at the end of the cylindrical body, the cover plate and the cylindrical body being connected by bolts.

[0018] Optionally, in the above-mentioned spent fuel transport device, the side of the cylinder is provided with air holes and water holes, which are used to introduce helium and deionized water, respectively.

[0019] This utility model provides a single-bar transport grid for spent fuel, which has the following advantages:

[0020] By assembling multiple separate sleeve elements together, a receiving space is formed inside the multiple separate sleeve elements, which can be used to contain spent fuel rods. The movement of spent fuel rods is restricted by the receiving space, thereby achieving the purpose of separately storing and transporting spent fuel rods in the spent fuel rod transport grid.

[0021] This utility model also provides a spent fuel transport device, including a spent fuel single rod transport grid, which can store and transport multiple spent fuel single rod transport grids. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a spent fuel single rod provided in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a single-bar transport grid for spent fuel provided in an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the upper clamp structure provided in an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the central clamp provided in an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the bottom clamp structure provided in an embodiment of the present utility model;

[0028] Figure 6 A schematic diagram of a spent fuel transport device (without the top cover) provided for an embodiment of this utility model;

[0029] Figure 7 for Figure 6 Top view;

[0030] Figure 8 This is a schematic diagram of a spent fuel transportation device provided for an embodiment of the present invention.

[0031] In the image above:

[0032] 100-Spent fuel single rod;

[0033] 200 - Spent fuel single-bar transport grid; 210 - Upper clamp; 220 - Middle clamp; 230 - Bottom clamp;

[0034] 300 - Spent fuel transport unit; 310 - Installation tank. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] The core of this invention is to provide a spent fuel single-bar transport rack capable of storing and transporting spent fuel single bars individually. Another objective of this invention is to provide a spent fuel transport device capable of storing and transporting multiple spent fuel single-bar transport racks.

[0037] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] For details, please refer to Figures 1-8 The present invention provides a spent fuel single rod transport grid 200, which includes multiple split sleeve elements.

[0039] Each split sleeve element is provided with a slot for limiting the spent fuel rod 100. Adjacent split sleeve elements are connected end to end in sequence. After multiple split sleeve elements are assembled together, all slots can form a receiving space for embedding the spent fuel rod 100.

[0040] It should be noted that the sequential connection between adjacent split sleeve components can be a detachable connection between adjacent split sleeve components, such as the contact surfaces of adjacent split sleeve components using a concave-convex snap-fit, or a snap-fit ​​connection, threaded connection, etc.; or it can be achieved by sequentially abutting adjacent split sleeve components under the constraint of the space of the spent fuel transport device, but without creating an actual structural connection.

[0041] The spent fuel single rod transport grid 200 provided in this solution uses multiple split sleeve elements assembled together to form a receiving space inside the multiple split sleeve elements that can accommodate the spent fuel single rod 100. The receiving space restricts the movement of the spent fuel single rod 100, thereby achieving the purpose of the spent fuel single rod transport grid 200 for the individual storage and transport of the spent fuel single rod 100.

[0042] To facilitate the installation and removal of spent fuel rods 100 within the spent fuel rod transport rack 200, the accommodating space of the spent fuel rod transport rack 200 is clearance-fitted with the spent fuel rod 100. That is, the slot size of the spent fuel rod transport rack 200 is slightly larger than the size of the spent fuel rod 100, allowing the spent fuel rod 100 to move slightly within the slot, but the range of movement is limited to prevent the spent fuel rod 100 from being bumped or knocked during transport.

[0043] In a specific embodiment, the multiple split-type sleeve elements include an upper clamp 210, a middle clamp 220, and a bottom clamp 230 arranged sequentially from top to bottom. The grooves of both the upper clamp 210 and the bottom clamp 230 are conical grooves. The conical design can, to a certain extent, disperse stress and prevent damage caused by concentrated loads. To match the shape of the spent fuel rod 100, the groove of the middle clamp 220 is a cylindrical groove; of course, other cylindrical groove structures can also be used. To facilitate the fixing of the spent fuel rod 100 within the receiving space of the spent fuel rod transport grid 200, clamps are used to lock the spent fuel rod 100 into the spent fuel rod transport grid 200.

[0044] In addition, this utility model also provides a spent fuel transport device 300, including a housing, a mounting frame disposed in the housing, and a spent fuel single rod transport grid 200 as described in the above specific embodiment. The mounting frame is provided with a plurality of mounting slots 310, and the spent fuel single rod transport grid 200 is disposed in the mounting slots 310.

[0045] Obviously, the spent fuel transport device 300, which includes the aforementioned spent fuel single rod transport grid 200, has the same beneficial effect. The spent fuel transport device 300 can store and transport multiple spent fuel single rod transport grids 200, and one spent fuel single rod transport grid 200 can store and transport a single spent fuel single rod 100.

[0046] The housing and mounting frame of the spent fuel transport device 300 can adopt the existing spent fuel transport container structure, but unlike it, the mounting slot 310 in the mounting frame is no longer used to transport spent fuel assemblies, but is used to transport spent fuel single rod transport grid 200 with spent fuel single rod 100.

[0047] like Figures 6-7 As shown, the mounting frame of the spent fuel transport unit 300 can accommodate five spent fuel single-bar transport racks 200.

[0048] In a specific embodiment, there are multiple mounting brackets, which are spaced apart inside the housing. This allows the thickness of the mounting brackets to be reduced while ensuring structural strength, thereby saving materials.

[0049] The mounting bracket can be made of honeycomb aluminum, which serves to absorb shock and conduct heat. The housing is made of stainless steel.

[0050] In a specific embodiment, the mounting bracket is cylindrical, and the hollow cavity of the housing matches the shape of the mounting bracket.

[0051] The casing includes a cylindrical body with an open end and a cover plate located at the end of the cylindrical body, which is bolted together. Specifically, the cylindrical body can be sealed with two layers of sealing caps. The inner cap is 24 cm thick and is fixed to the cylindrical body with 12 bolts, while the outer cap is 10 cm thick and is fixed to the inner cap with 24 bolts. A lead layer is placed between the two sealing caps to shield against neutrons.

[0052] In a specific embodiment, air holes and water holes are respectively provided on the side of the cylinder for introducing helium gas and deionized water.

[0053] Through such Figure 8 The structure shown features water holes in the spent fuel transport device 300, primarily for filling and venting the spent fuel rods 100 during loading. The loading of the spent fuel rods 100 into the spent fuel rod transport rack 200 takes place underwater in the water tank used for storing spent fuel. To ensure the spent fuel water tank is not disturbed by external gases, the gas inside the container is typically vented completely in the cleaning well. The main purpose of these water holes is to inject the same deionized water as the spent fuel water tank, thereby venting any remaining gas inside the container. This process fills the spent fuel transport device 300 with water, and then the entire device is moved from the cleaning well to the loading well, thus connecting the spent fuel transport device 300 to the spent fuel water tank.

[0054] After the spent fuel rod 100 is loaded into the spent fuel rod transport rack 200, the water in the spent fuel transport device 300 needs to be drained to allow for the filling with inert gases such as helium. The first step involves filling the device with air through a vent to expel the deionized water from the spent fuel transport device 300. The second step involves evacuating the container of air and excess water vapor using a pump (vacuum drying process). The third step involves filling the device with an appropriate amount of inert gas, helium, through a vent. The leakage rate of the spent fuel transport device 300 is tested by measuring the helium concentration outside the device to ensure that aerosols generated by spent fuel do not diffuse into the atmosphere (or remain within a reasonable range specified by relevant standards).

[0055] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0056] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0057] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A single-bar conveyor rack for spent fuel, characterized in that, It includes multiple split sleeve elements, each of which is provided with a slot for limiting the spent fuel rod (100). Adjacent split sleeve elements are connected end to end. After multiple split sleeve elements are assembled together, all the slots can form a receiving space for embedding the spent fuel rod (100).

2. The spent fuel single-bar transport grid according to claim 1, characterized in that, The accommodating space of the spent fuel bar transport grid (200) is clearance-fitted with the spent fuel bar (100).

3. The spent fuel single-bar transport grid according to claim 1, characterized in that, The plurality of the split sleeve elements include an upper clamp (210), a middle clamp (220) and a bottom clamp (230) arranged sequentially from top to bottom.

4. The spent fuel single-bar transport grid according to claim 3, characterized in that, The slots of the upper clamp (210) and the bottom clamp (230) are both conical slots; And / or, the groove of the central clamp (220) is a cylindrical groove.

5. The spent fuel single-bar transport grid according to claim 1, characterized in that, The spent fuel single-bar transport grid (200) is rectangular or polygonal in shape.

6. A spent fuel transport device, characterized in that, It includes a housing, a mounting bracket disposed within the housing, and a spent fuel single rod transport grid (200) as described in any one of claims 1-5, wherein the mounting bracket is provided with a plurality of mounting slots (310), and the spent fuel single rod transport grid (200) is disposed within the mounting slots (310).

7. The spent fuel transport device according to claim 6, characterized in that, The number of mounting brackets is multiple, and the multiple mounting brackets are arranged at intervals within the housing; And / or, the mounting bracket is made of honeycomb aluminum material; And / or, the housing is made of stainless steel.

8. The spent fuel transport device according to claim 6, characterized in that, The mounting bracket is cylindrical, and the hollow cavity of the housing matches the shape of the mounting bracket.

9. The spent fuel transport device according to claim 6, characterized in that, The housing includes a cylindrical body with an end opening and a cover plate disposed at the end of the cylindrical body, the cover plate and the cylindrical body being connected by bolts.

10. The spent fuel transport device according to claim 9, characterized in that, The sides of the cylinder are provided with air holes and water holes, which are used to introduce helium gas and deionized water, respectively.

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