Spent fuel transport plant layout structure and spent fuel transport container hoisting method

Abstract

The present invention discloses a spent fuel transport plant layout structure and a method for hoisting a spent fuel transport container. The spent fuel transport plant layout structure includes a loading well, a preparation well and a hoisting hole arranged in a row, and a buffer layer is respectively arranged below the loading well, the preparation well and the hoisting hole; a transfer platform higher than the bearing bottom surface of the loading well is arranged in the loading well, so that the spent fuel transport container is hoisted from the transfer platform to the preparation well; the preparation well and the hoisting hole are adjacently connected, and the two are connected or separated by a gate. The present invention ensures that the hoisting height of the spent fuel transport container does not exceed 9m in each step of hoisting and transfer by setting the transfer platform in the loading well and setting the gate between the preparation well and the transfer well, so as to meet the existing specifications and manufacturing acceptance conditions; a buffer layer is respectively arranged below the loading well, the preparation well and the hoisting hole to meet the buffering requirements of the spent fuel transport container falling 9m.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant layout, and in particular to a spent fuel transport plant layout structure and a method for hoisting a spent fuel transport container. Background Art

[0002] In the current mainstream third-generation nuclear power technology at home and abroad, spent fuel is transported through the spent fuel pool, lifting port, preparation well and loading well set up in the fuel plant. After various operations are carried out by the spent fuel transport container crane set up in the fuel plant, the spent fuel is loaded into the spent fuel transport container and then transported out of the plant for processing. In order to reduce the risk of lifting and simplify the control and operation of the crane, the loading well, preparation well and lifting port are arranged in a straight line.

[0003] During the spent fuel operation process, the risk of heavy objects falling needs to be fully considered. In order to meet the fall safety requirements, according to GB11806 "Specifications for the Safe Transport of Radioactive Materials", the 9m free fall impact performance of the spent fuel transport container is a key indicator. The drop height of the spent fuel transport container is closely related to the structural design of the lifting port, preparation well, and loading well.

[0004] The current spent fuel handling process has the following shortcomings:

[0005] 1) During the transportation of spent fuel transport containers, the height of the spent fuel transport containers in the loading well and the lifting port exceeded 9m, which exceeded the 9m anti-fall capability of the container test. No shock-absorbing layer was set at the lifting hole to protect the container from falling impact. If the container falls, the integrity of the container and the integrity of the plant structure cannot be guaranteed.

[0006] 2) The personnel platform at the bottom of the spent fuel pool crane cannot cover the loading well. An auxiliary platform is required for the transportation of spent fuel. There is a need to switch operating modes when loading fuel, which poses a high risk of human error.

[0007] 3) When receiving and transporting spent fuel transport containers, due to the limited size of the lifting port, the container crane and transport vehicle need to coordinate under the lifting port to complete the flipping operation. Because the crane and transport vehicle are controlled by different operators and are far away, there is a risk of incoordination. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a spent fuel transport plant layout structure and a spent fuel transport container hoisting method with a hoisting height within the 9m anti-fall capability of the spent fuel transport container test.

[0009] The technical solution adopted by the present invention to solve the technical problem is: to provide a spent fuel transportation plant layout structure, including a loading well, a preparation well and a hoisting hole arranged in a row, and a buffer layer is respectively provided under the loading well, the preparation well and the hoisting hole;

[0010] A transfer platform higher than the bearing bottom surface of the loading well is provided in the loading well, so that the spent fuel transport container can be hoisted from the transfer platform to the preparation well, and the hoisting height is less than 9m;

[0011] The preparation well and the hoisting hole are adjacently connected, and are connected or isolated by a gate; when the gate is opened to connect the preparation well and the hoisting hole, the spent fuel transport container in the preparation well is translated into the hoisting hole through the gate.

[0012] Preferably, the loading well and the preparation well are adjacently connected via a partition wall;

[0013] The transfer platform is connected to one side of the partition wall located in the loading well, and the height of the partition wall above the transfer platform is less than 9m.

[0014] Preferably, the elevation of the transfer platform is 11.5m-12.5m.

[0015] Preferably, a platform buffer layer is provided below the transfer platform.

[0016] Preferably, the length and width of the hoisting hole are enlarged, and the length and width of the hoisting hole are 5.5m and 6.5m respectively.

[0017] Preferably, the spent fuel transport plant layout structure further includes a first operating platform which is arranged on the transfer platform and can be arranged around the outside of the spent fuel transport container.

[0018] Preferably, the spent fuel transport plant layout structure further includes a second operating platform which is arranged in the preparation well and can be arranged around the outer periphery of the spent fuel transport container.

[0019] Preferably, the second operating platform is detachably arranged.

[0020] The present invention also provides a method for hoisting a spent fuel transport container, which is performed in any one of the above-mentioned spent fuel transport plant layout structures; the method for hoisting a spent fuel transport container comprises the following steps:

[0021] S1. Connect the lifting equipment to the spent fuel transport container on the bearing bottom surface in the loading well;

[0022] S2, lifting the spent fuel transport container and placing it on the transfer platform in the loading well, the lifting height being less than 9m;

[0023] S3, lifting the spent fuel transport container from the transfer platform, leaving the loading well and moving it above the preparation well, and lowering the spent fuel transport container into the preparation well;

[0024] Wherein, the height of lifting the spent fuel transport container from the transfer platform is less than 9m;

[0025] S4, after opening the gate between the preparation well and the hoisting hole, lift the spent fuel transport container and translate it into the hoisting hole;

[0026] S5. Lowering the spent fuel transport container into the hoisting hole onto a transport vehicle at the bottom of the hoisting hole.

[0027] Preferably, in step S5, the lifting equipment lowers the spent fuel transport container until it is laid flat on the transport vehicle.

[0028] The beneficial effects of the present invention are as follows: by setting a transfer platform in the loading well and setting a gate between the preparation well and the transfer well, it is ensured that the hoisting height of the spent fuel transport container does not exceed 9m in each step of hoisting and transfer, meeting the existing specifications and manufacturing acceptance conditions; buffer layers are respectively provided under the loading well, the preparation well and the hoisting hole, meeting the buffering requirements of the spent fuel transport container falling 9m. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 This is a schematic elevational structural diagram of a spent fuel transport plant layout structure according to an embodiment of the present invention;

[0031] Figure 2 It is a schematic plan view of the layout structure of a spent fuel transportation plant according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0033] like Figure 1 , 2 As shown, the layout structure of the spent fuel transportation plant according to an embodiment of the present invention includes a loading well 10, a preparation well 20 and a hoisting hole 30 arranged in a row.

[0034] In the spent fuel transportation building of the nuclear power plant, the loading well 10 is located on one side of the spent fuel pool 100 , so that the spent fuel pool 100 , the loading well 10 , the preparation well 20 and the lifting hole 30 are also arranged in a row.

[0035] Among them, the spent fuel pool 100 is a place for storing spent fuel during the operation of the nuclear power plant; the loading well 10 is used as a place for loading spent fuel into spent fuel transport containers 200; the preparation well 20 is used as a place for operations such as cleaning and inspecting spent fuel transport containers 200; the lifting hole 30 is used for new fuel and spent fuel transport containers 200 and other PMC (nuclear fuel loading and unloading storage system) equipment to enter and exit the plant.

[0036] Buffer layers are provided below the loading well 10, the preparation well 20 and the hoisting hole 30 to meet the buffering requirements of the 9m drop of the spent fuel transport container. The above-mentioned buffer layers are divided into a first buffer layer 11, a second buffer layer 21 and a third buffer layer 31. The first buffer layer 11 is arranged below the loading well 10, the second buffer layer 21 is arranged below the preparation well 20, and the third buffer layer 31 is arranged below the hoisting hole 30. The elevation of the third buffer layer 31 below the hoisting hole 30 can be, but is not limited to, -4.900m.

[0037] The material and thickness of each buffer layer can refer to the existing technical setting requirements and actual needs respectively.

[0038] Usually, the inner bottom surface of the loading well 10 forms a bearing bottom surface for placing the spent fuel transport container 200 thereon. In the present invention, a transfer platform 40 higher than the bearing bottom surface of the loading well 10 is provided in the loading well 10, so that the spent fuel transport container 200 is hoisted from the transfer platform 40 to the preparation well 20, and the hoisting height is less than 9m, thereby making the hoisting height within the 9m anti-fall capability of the spent fuel transport container 200 tested.

[0039] In combination with the arrangement of the transfer platform 40 inside the loading well 10 , a first buffer layer 11 is provided below the bearing bottom surface, and a platform buffer layer 12 is provided below the transfer platform 40 .

[0040] In this embodiment, if Figure 1 As shown, the loading well 10 and the preparation well 20 are adjacently connected by a partition wall 22. The transfer platform 40 is connected to one side of the partition wall 22 located in the loading well 20, and the height of the partition wall 22 on the transfer platform 40 is less than 9m, so that the spent fuel transport container 200 on the transfer platform 40 can be hoisted and cross the partition wall 22 to enter the preparation well 20 at a height of less than 9m.

[0041] In addition, the height of the transfer platform 40 relative to the bearing bottom surface is also set less than 9m, so when the spent fuel transport container 200 is lifted from the bearing bottom surface and placed on the transfer platform 40, it is not necessary to lift it to a height above 9m, that is, the lifting height is within the 9m anti-fall capability tested by the spent fuel transport container 200.

[0042] Specifically, Figure 1In the illustrated embodiment, the elevation of the bearing bottom surface of the loading well 10 is +4.800 m, and the elevation of the transfer platform 40 is +12.00 m, that is, the height of lifting the spent fuel transport container 200 from the bearing bottom surface to the transfer platform 40 is 7.2 m.

[0043] It is understandable that the elevation of the transfer platform is not limited to 12m, and can be flexibly set within the range of 11.5m-12.5m.

[0044] The preparation well 20 and the hoisting hole 30 are adjacently connected, and the two are connected or separated by a gate 50. When the gate 50 is opened to connect the preparation well 20 and the hoisting hole 30, the spent fuel transport container 200 in the preparation well 20 can be translated into the hoisting hole 30 through the gate 50, so there is no need to lift the spent fuel transport container 200 to a sufficient height for transfer, so the elevation of the inner bottom surface of the preparation well 20 does not need to be limited to 9m or less.

[0045] Alternatively, the gate 50 can be opened and closed by pulling, lifting or folding. For example, when the preparation well 20 and the hoisting hole 30 need to be connected, the gate 50 is pulled upward, so that a through hole is formed at the original position of the gate 50 to allow the spent fuel transport container 200 to pass through and enter the hoisting hole 30. After the transfer is completed, the gate 50 is lowered to separate the preparation well 20 and the hoisting hole 30.

[0046] Alternatively, when it is necessary to connect the preparation well 20 and the lifting hole 30, the gate 50 is lowered to enter the interlayer of the wall below, so that a through hole is formed at the original position of the gate 50 to allow the spent fuel transport container 200 to pass through and enter the lifting hole 30. After the transfer is completed, the gate 50 is lifted up to separate the preparation well 20 and the lifting hole 30.

[0047] Alternatively, the gate 50 can be pulled into the side wall, and when the preparation well 20 and the hoisting hole 30 need to be connected, the gate 50 is moved into the side wall, so that a through hole is formed at the original position of the gate 50 to allow the spent fuel transport container 200 to pass through and enter the hoisting hole 30. After the transfer is completed, the gate 50 is pulled out of the side wall to separate the preparation well 20 and the hoisting hole 30.

[0048] Alternatively, the gate 50 is implemented as a foldable door. When the preparation well 20 and the hoisting hole 30 need to be connected, the gate 50 is folded to one side, so that a through hole is formed at the original position of the gate 50 to allow the spent fuel transport container 200 to pass through and enter the hoisting hole 30. After the transfer is completed, the gate 50 is unfolded to separate the preparation well 20 and the hoisting hole 30.

[0049] The above opening and closing of the gate 50 can be achieved by adopting a corresponding driving mechanism to reduce manual operations.

[0050] Furthermore, in order to achieve the flipping of the spent fuel transport container 200 at a fixed point below the lifting hole 30 and place it on the transport vehicle 30 in a flat state, the inner dimension of the lifting hole 30 is also enlarged in the present invention so that the inner circumference dimension of the lifting hole 30 is sufficient to meet the flipping of the spent fuel transport container 200 from standing to lying.

[0051] In this embodiment, the length and width of the hoisting hole 30 are enlarged, so that the length and width of the hoisting hole 30 are 5.5 m and 6.5 m respectively.

[0052] Furthermore, the spent fuel transport plant layout structure of the present invention may also include a first operating platform 60 that is arranged on the transfer platform 40 and can be arranged around the outside of the spent fuel transport container 200, so that the operator can perform operations such as bolt tightening, air filling and drainage, vacuum drying, helium filling, and sealing detection on the spent fuel transport container 200 on the first operating platform 60.

[0053] Preferably, the first operating platform 60 can be connected to the inner wall surface of the partition wall 22. The first operating platform 60 can be provided with an arc-shaped recess on the side facing away from the partition wall 22, which matches the outer peripheral surface of the spent fuel transport container 200, so that the first operating platform 60 is close to the spent fuel transport container 200 through the recess, and the operator can perform operations such as bolt tightening, air filling and drainage, vacuum drying, helium filling, and sealing detection on the spent fuel transport container 200 on the edge of the recess.

[0054] The concave setting on the first operating platform 60 also means that it does not surround the entire outer circumference of the spent fuel transport container 200, but only a part of the arc-shaped outer circumference, so it does not affect the lifting or lowering of the spent fuel transport container 200. Furthermore, the first operating platform 60 can be fixed on the transfer platform 40 as a fixed facility without repeated disassembly and assembly.

[0055] The spent fuel transport plant layout structure of the present invention may further include a second operating platform 70 disposed in the preparation well 20 and surrounding the outer periphery of the spent fuel transport container 200, so that operators can perform operations such as bolt tightening, air filling and drainage, vacuum drying, helium filling, and sealing detection on the spent fuel transport container 200 on the second operating platform 70.

[0056] In order not to affect the translation of the spent fuel transport container 200 through the gate 50 and into the hoisting hole 30, the second operating platform 70 is preferably detachable. After the spent fuel transport container 200 is hoisted to the preparation well 20, the second operating platform 70 is installed, and the operator performs operations such as bolt tightening, air filling and drainage, vacuum drying, helium filling, and sealing detection on the spent fuel transport container 200 on the second operating platform 70. Before the spent fuel transport container 200 is hoisted to the hoisting hole 30, the second operating platform 70 is dismantled or hoisted away from the preparation well 20 to make room for the translation of the spent fuel transport container 200.

[0057] In the layout structure of the spent fuel transport plant of the present invention, the first operating platform 60 and the second operating platform 70 can be respectively made of steel structures. In addition, guardrails are respectively provided on the first operating platform 60 and the second operating platform 70 to provide certain protection for the operators and avoid dangers such as falling.

[0058] The layout structure of the spent fuel transport plant of the present invention ensures that each step of the spent fuel transport container 200 during the hoisting operation is less than 9m, meeting the 9m drop test requirements of existing spent fuel transport containers without the need for additional testing and identification.

[0059] In addition, by improving the size of the hoisting hole 30, the requirement of fixed-point flipping of the spent fuel transport container 200 during reception and transportation is met, avoiding the risk caused by the coordinated flipping of the hoisting equipment 400 (such as a crane) and the transport vehicle 300.

[0060] In this regard, refer to Figure 1 and Figure 2 The method for hoisting a spent fuel transport container implemented in the spent fuel transport plant layout structure of the present invention may include the following steps:

[0061] S1. Connect the hoisting equipment 400 to the spent fuel transport container 200 on the bearing bottom surface in the loading well 10.

[0062] Before step S1 , the spent fuel is loaded from the spent fuel pool 100 into the spent fuel transport container 200 in advance, and the loading operation is mainly performed in the loading well 10 .

[0063] After the spent fuel is canned and completed, the spent fuel transport container 200 is mainly placed on the bearing bottom surface in the loading well 10 .

[0064] The spent fuel transportation plant layout structure of the present invention can take into account both the fuel floor crane and the overhead crane.

[0065] S2. Lift the spent fuel transport container 200 and place it on the transfer platform 40 in the loading well 10. The lifting height is less than 9 m.

[0066] Specifically, the spent fuel transport container 200 on the bearing bottom surface is hoisted onto the transfer platform 40 in the loading well 10 by the hoisting equipment 400. Since the elevation difference between the transfer platform 40 and the bearing bottom surface is less than 9m, the hoisting height of the spent fuel transport container 200 is also less than 9m, and the hoisting height is within the 9m anti-fall capability of the spent fuel transport container 200 tested.

[0067] S3, lifting the spent fuel transport container 200 from the transfer platform 40, leaving the loading well 10 and moving it to above the preparation well 20, and lowering the spent fuel transport container 200 into the preparation well 20.

[0068] The spent fuel transport container 200 is hoisted from the transfer platform 40 by the hoisting equipment 400, and the hoisting height is less than 9m. Considering that the height of the partition wall 22 is usually less than 9m, generally in the range of 4.5m-6m, the hoisting height is also less than 9m, and the hoisting height is within the 9m anti-fall capability of the spent fuel transport container 200 tested.

[0069] S4. After opening the gate 50 between the preparation well 20 and the hoisting hole 30 , the spent fuel transport container 200 is lifted and translated into the hoisting hole 30 .

[0070] After the gate 50 is opened, the spent fuel transport container 200 is lifted off the bottom surface of the preparation well 20 by the lifting equipment 400 and then horizontally moved into the lifting hole 30 .

[0071] After the spent fuel transport container 200 is transferred, the gate 50 can be lowered to separate the preparation well 20 and the lifting hole 30 .

[0072] The gate 50 can be opened and closed by pulling, lifting or folding. Alternatively, in this step, when the preparation well 20 and the hoisting hole 30 need to be connected, the gate 50 is lowered to enter the interlayer of the wall below, so that a through hole is formed at the original position of the gate 50 to allow the spent fuel transport container 200 to enter the hoisting hole 30. After the transfer is completed, the gate 50 is lifted to separate the preparation well 20 and the hoisting hole 30.

[0073] Alternatively, the gate 50 can be pulled into the side wall, and when the preparation well 20 and the hoisting hole 30 need to be connected, the gate 50 is moved into the side wall, so that a through hole is formed at the original position of the gate 50 to allow the spent fuel transport container 200 to pass through and enter the hoisting hole 30. After the transfer is completed, the gate 50 is pulled out of the side wall to separate the preparation well 20 and the hoisting hole 30.

[0074] Alternatively, the gate 50 is implemented as a foldable door. When the preparation well 20 and the hoisting hole 30 need to be connected, the gate 50 is folded to one side, so that a through hole is formed at the original position of the gate 50 to allow the spent fuel transport container 200 to pass through and enter the hoisting hole 30. After the transfer is completed, the gate 50 is unfolded to separate the preparation well 20 and the hoisting hole 30.

[0075] S5. In the hoisting hole 30 , the spent fuel transport container 200 is lowered onto the transport vehicle 300 at the bottom of the hoisting hole 30 .

[0076] Specifically, the hoisted spent fuel transport container 200 is stably lowered in the hoisting hole 30 by the hoisting equipment 400 until it is aligned above the transport vehicle 300 below.

[0077] Since there is enough space inside the lifting hole 30, the lifting equipment 400 continues to lower the spent fuel transport container 200 until the spent fuel transport container 200 is placed flat on the transport vehicle 300, thereby eliminating the need for the transport vehicle 300 and the lifting equipment 400 to perform complex adjustments to coordinate with the flipping of the spent fuel transport container 200, thereby reducing the risks involved.

[0078] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A spent fuel transport plant layout structure, characterized in that: It includes a loading well, a preparation well and a hoisting hole arranged in a line, and a buffer layer is respectively provided under the loading well, the preparation well and the hoisting hole; the loading well is located on one side of the spent fuel pool; A transfer platform higher than the bearing bottom surface of the loading well is provided in the loading well, so that the spent fuel transport container can be hoisted from the transfer platform to the preparation well, and the hoisting height is less than 9m; the loading well and the preparation well are adjacently connected by a partition wall; the transfer platform is connected to one side of the partition wall located in the loading well, and the height of the partition wall above the transfer platform is less than 9m; the height of the transfer platform relative to the bearing bottom surface of the loading well is less than 9m; The preparation well and the hoisting hole are adjacently connected, and the two are connected or isolated by a gate; when the gate is opened to connect the preparation well and the hoisting hole, the spent fuel transport container in the preparation well is translated into the hoisting hole through the gate; The length and width of the hoisting hole are enlarged, and the length and width of the hoisting hole are 5.5m and 6.5m respectively, which can meet the requirements of the spent fuel transport container being turned from upright to horizontal. The spent fuel transport plant layout structure also includes a first operating platform arranged on the transfer platform and can be arranged around the outside of the spent fuel transport container, and a second operating platform arranged in the preparation well and can be arranged around the outer periphery of the spent fuel transport container, and the second operating platform is detachably arranged; the first operating platform and the second operating platform are respectively used by operators to perform operations such as bolt tightening, air filling and drainage, vacuum drying, helium filling, and sealing detection on the spent fuel transport container.

2. The spent fuel transportation plant layout structure according to claim 1 is characterized in that: The elevation of the transfer platform is 11.5m-12.5m.

3. The spent fuel transportation plant layout structure according to claim 1 is characterized in that: A platform buffer layer is provided below the transfer platform.

4. A method for hoisting a spent fuel transport container, characterized in that: The method is carried out in the spent fuel transport plant layout structure according to any one of claims 1 to 3; the method for hoisting the spent fuel transport container comprises the following steps: S1. Connect the lifting equipment to the spent fuel transport container on the bearing bottom surface in the loading well; S2, lifting the spent fuel transport container and placing it on the transfer platform in the loading well, the lifting height being less than 9m; S3, lifting the spent fuel transport container from the transfer platform, leaving the loading well and moving it above the preparation well, and lowering the spent fuel transport container into the preparation well; Wherein, the height of lifting the spent fuel transport container from the transfer platform is less than 9m; S4, after opening the gate between the preparation well and the hoisting hole, lift the spent fuel transport container and translate it into the hoisting hole; S5. Lowering the spent fuel transport container into the hoisting hole onto a transport vehicle at the bottom of the hoisting hole.

5. The method for hoisting a spent fuel transport container according to claim 4, characterized in that: In step S5, the hoisting equipment lowers the spent fuel transport container until it is laid flat on the transport vehicle.

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