Spent fuel storage rack installation method

Abstract

This invention relates to the field of spent fuel storage rack installation technology, specifically to a method for installing spent fuel storage racks. The method includes the following steps: installing a track assembly inside an auxiliary building; the track assembly includes a vertically arranged first track and a second track; installing a crane mechanism on the track assembly; placing the spent fuel storage rack on the tipping frame of a transport vehicle; transporting the rack to below the lifting opening of the auxiliary building; and using the crane mechanism on the track assembly in conjunction with a crane below the lifting opening to place the rack on the ground. This invention allows for installation and introduction after the auxiliary building is topped out, thus preventing foreign objects from falling into the racks before the auxiliary building is topped out, as well as external foreign objects falling into the racks. Furthermore, because the auxiliary building is topped out, the environment is better, reducing the likelihood of rust and making cleaning and maintenance easier.

Description

Technical Field

[0001] This invention relates to the field of spent fuel storage rack installation technology, and more specifically to a method for installing spent fuel storage racks. Background Technology

[0002] The spent fuel storage rack is installed in the spent fuel pool in the fuel building and is an important piece of equipment in the fuel handling and storage system of a pressurized water reactor nuclear power plant. The fuel building contains areas such as the spent fuel pool, container cleaning pool, auxiliary buildings, and operating rooms.

[0003] The existing CAP1400 and AP1000 type spent fuel storage racks are installed by hoisting them into the unsealed fuel building before the fuel building is capped. A 400t crawler crane and a 50t truck crane are used to hoist them into the unsealed fuel building.

[0004] Because this method does not involve hoisting the spent fuel storage racks in after the fuel plant is topped out, the spent fuel storage racks are in a humid and polluted environment for a long time before the fuel plant is topped out and during the commissioning and construction phases. The various storage compartments of the spent fuel storage racks are prone to rust and foreign objects falling into them, and they are difficult to clean and maintain later. Summary of the Invention

[0005] (I) The problem to be solved by this invention is: how to introduce the spent fuel storage rack after the fuel plant is capped.

[0006] (II) Technical Solution

[0007] The spent fuel storage rack installation method provided by the present invention includes the following installation steps:

[0008] S1: Install a track assembly in the auxiliary workshop. The track assembly includes a first track and a second track that are set vertically. Install a crane mechanism on the track assembly.

[0009] S2: Place the spent fuel storage racks onto the tipping frame of the transport vehicle and transport them to the area below the hoisting opening of the auxiliary plant.

[0010] S3: The spent fuel storage rack is placed on the ground by cooperating with the crane mechanism on the track assembly and the crane below the hoisting port of the auxiliary plant;

[0011] S4: Connect the crane mechanism hook to the spent fuel storage grid lifting tool, then install the spent fuel storage grid lifting tool on the spent fuel storage grid, lift the spent fuel storage grid with the crane mechanism and move it along the track assembly to the designated position above the spent fuel pool, and then lower the spent fuel storage grid.

[0012] S5: Disconnect the crane hook from the spent fuel storage grid lifting tool, remove the spent fuel storage grid lifting tool, and proceed with the lifting and introduction of the next spent fuel storage grid.

[0013] According to one embodiment of the present invention, the crane mechanism in step S1 includes a spent fuel container crane, a fuel grabber, and a hand-cranked double-beam trolley. The spent fuel container crane and the fuel grabber are arranged sequentially along the length direction of the first track. The fuel grabber is provided with a moving track, and the hand-cranked double-beam trolley is arranged on the moving track. The length direction of the moving track is perpendicular to the length direction of the first track.

[0014] According to an embodiment of the present invention, the installation of the crane mechanism on the track assembly in step S1 includes the following steps:

[0015] S11: Install suspension points on the roof of the auxiliary plant;

[0016] S12: Connect the slings to the hand-cranked double-girder trolley, hoist the hand-cranked double-girder trolley onto the moving track on the fuel grabber through the lifting points, and connect it to the fuel grabber through the anti-tipping hook.

[0017] According to one embodiment of the present invention, step S2, which involves placing the spent fuel storage rack onto the tipping frame of the transport vehicle and transporting it by the transport vehicle to the area below the hoisting opening of the auxiliary plant, includes the following steps:

[0018] S21: After removing the outer packaging of the spent fuel storage rack and hoisting the tipper onto the transport vehicle, place the spent fuel storage rack onto the tipper.

[0019] S22: Secure the spent fuel storage rack and the transport vehicle with the first sealing belt, secure the spent fuel storage rack and the tipping frame with the second sealing belt, move the transport vehicle to below the hoisting opening of the auxiliary plant, and release the first sealing belt.

[0020] According to one embodiment of the present invention, in step S3, the spent fuel storage rack is placed on the ground by means of a crane mechanism on the track assembly cooperating with a crane below the auxiliary plant hoisting port, including the following steps:

[0021] S31: Four counterweights are arranged below the hoisting opening of the auxiliary plant, and a first hand chain hoist is connected to each counterweight;

[0022] S32: After flipping the spent fuel storage rack from horizontal to vertical by connecting the spent fuel container crane hook and the MH crane hook below the auxiliary plant lifting port to the first and second lifting points in the tilting frame respectively, connect each first hand chain hoist to the lifting lug plate on the tilting frame.

[0023] S33: Place the overturned vertical spent fuel storage rack on the ground and adjust the first hand chain hoist to tighten the tilting frame.

[0024] According to one embodiment of the present invention, between steps S2 and S3, the following step is further included:

[0025] Two sets of scaffolding were erected in the container washing pool on one side of the spent fuel water pool, and spent fuel storage grid hoisting tools were assembled.

[0026] According to one embodiment of the present invention, in step S4, connecting the crane hook to the spent fuel storage grid lifting tool, then installing the spent fuel storage grid lifting tool on the spent fuel storage grid, lifting the spent fuel storage grid by the crane mechanism and moving it along the track assembly to a designated position above the spent fuel pool, and then lowering the spent fuel storage grid includes the following steps:

[0027] Connect the spent fuel container crane hook to the spent fuel storage grid lifting tool. Use the spent fuel container crane to lift the spent fuel storage grid lifting tool to the spent fuel storage grid. Connect the spent fuel storage grid lifting tool to the spent fuel storage grid. Release the second sealing belt. Use the spent fuel container crane to lift the spent fuel storage grid and move it along the track assembly to the designated position above the spent fuel pool. Then lower the spent fuel storage grid.

[0028] According to one embodiment of the present invention, in step S4, connecting the crane hook to the spent fuel storage grid lifting tool, then installing the spent fuel storage grid lifting tool on the spent fuel storage grid, lifting the spent fuel storage grid by the crane mechanism and moving it along the track assembly to a designated position above the spent fuel pool, and then lowering the spent fuel storage grid includes:

[0029] S41: Connect the spent fuel container crane hook to the spent fuel storage grid lifting tool, use the spent fuel container crane to lift the spent fuel storage grid lifting tool to the spent fuel storage grid, connect the spent fuel storage grid lifting tool to the spent fuel storage grid, release the second sealing belt, use the spent fuel container crane to lift the spent fuel storage grid, and move it along the track assembly to a position close to the fuel grabber, and remove the spent fuel container crane hook;

[0030] S42: Connect the special lifting tool for the fuel storage rack to the slings of the hand-cranked double-beam trolley, and move the hand-cranked double-beam trolley along the track assembly by the fuel grabber. Move the spent fuel storage rack above the spent fuel pool at the designated location by the hand-cranked double-beam trolley along the moving track on the fuel grabber, and then lower the spent fuel storage rack.

[0031] According to one embodiment of the present invention, in step S5, disconnecting the crane mechanism hook from the spent fuel storage grid lifting tool and dismantling the spent fuel storage grid lifting tool includes:

[0032] Remove the spent fuel storage grid hoisting tool from the installed spent fuel storage grid, use a spent fuel container crane to put the spent fuel storage grid hoisting tool back onto the scaffolding, and then release the spent fuel container crane hook and the spent fuel storage grid hoisting tool.

[0033] According to one embodiment of the present invention, in step S5, disconnecting the crane mechanism hook from the spent fuel storage grid lifting tool and dismantling the spent fuel storage grid lifting tool includes:

[0034] Remove the spent fuel storage grid hoisting tool from the installed spent fuel storage grid. Use the slings on the hand-cranked double-girder trolley to move the spent fuel storage grid hoisting tool to the scaffolding. Then disconnect the slings on the hand-cranked double-girder trolley from the spent fuel storage grid hoisting tool.

[0035] The beneficial effects of this invention are:

[0036] By installing a track assembly with a first and second track perpendicular to each other inside the auxiliary plant, and installing a crane mechanism on the track assembly, after the spent fuel storage rack is transported to the area below the hoisting opening of the auxiliary plant by the tipping frame of the transport vehicle, the spent fuel storage rack can be placed on the ground by the crane mechanism and the crane below the hoisting opening of the auxiliary plant. The hook of the crane mechanism is connected to the spent fuel storage rack hoisting tool, and then the spent fuel storage rack is connected to the spent fuel storage rack. The crane mechanism can then hoist the spent fuel storage rack into the designated spent fuel pool and then lower it. This method allows the spent fuel storage rack to be hoisted and introduced after the fuel plant is capped, thus preventing foreign objects from falling into the spent fuel storage rack during the pre-capping and commissioning construction stages, as well as external foreign objects falling into the spent fuel storage rack. Furthermore, since the fuel plant is capped, the environment is better and rust is less likely to occur.

[0037] Since the spent fuel storage racks were hoisted in after the fuel plant was topped out, the time between the pickling and passivation treatment of each storage compartment of the spent fuel storage racks and their initial use was relatively short before they were hoisted in place. This made them easier to clean and maintain later. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 A flowchart illustrating the method for installing spent fuel storage racks according to an embodiment of the present invention;

[0040] Figure 2 An installation diagram of a transport vehicle, a spent fuel storage rack, and a tipping frame is provided for embodiments of the present invention;

[0041] Figure 3 This is a schematic diagram of the tilting frame flipping according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the tilting frame and spent fuel storage rack after they have been erected, as provided in an embodiment of the present invention.

[0043] Figure 5 A schematic diagram illustrating the lifting of spent fuel storage racks into a spent fuel pool by a spent fuel container crane, as provided in an embodiment of the present invention.

[0044] Figure 6 A schematic diagram of a sling used for hoisting a spent fuel storage rack according to an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram showing the layout of the auxiliary plant area, the movement range of the fuel grabber, and the movement range of the spent fuel container crane, provided for embodiments of the present invention.

[0046] Icons: 1. Spent fuel container crane; 2. Fuel grabber; 3. Hand-cranked double-girder trolley; 4. Lifting slings; 401. Second hand chain hoist; 402. First lifting sling; 403. Second lifting sling; 404. Third lifting sling; 405. Safety rope; 5. Auxiliary plant lifting port; 6. Spent fuel water pool; 7. Transport vehicle; 8. Tilting frame; 801. First lifting point; 802. Second lifting point; 9. Counterweight; 10. Spent fuel storage rack; 11. Lifting lug; 12. First hand chain hoist; 13. Container cleaning pool. Detailed Implementation

[0047] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] like Figure 1 - Figure 7 As shown, one embodiment of the present invention provides a method for installing spent fuel storage racks, including the following installation steps:

[0049] S1: Install a track assembly in the auxiliary workshop. The track assembly includes a first track and a second track that are set vertically. Install a crane mechanism on the track assembly.

[0050] S2: Place the spent fuel storage rack 10 onto the tipping frame 8 of the transport vehicle 7, and transport it to the area below the hoisting port 5 of the auxiliary plant via the transport vehicle 7;

[0051] S3: The spent fuel storage rack 10 is placed on the ground by cooperating with the crane mechanism on the track assembly and the crane below the auxiliary plant hoisting port 5;

[0052] S4: Connect the crane mechanism hook to the spent fuel storage grid lifting tool, then install the spent fuel storage grid lifting tool on the spent fuel storage grid 10, lift the spent fuel storage grid 10 by the crane mechanism and move it along the track assembly to the designated position above the spent fuel pool 6, and then lower the spent fuel storage grid 10.

[0053] S5: Disconnect the crane hook from the spent fuel storage grid lifting tool, remove the spent fuel storage grid lifting tool, and proceed with the lifting and introduction of the next spent fuel storage grid 10.

[0054] By installing a track assembly with a first and second track perpendicular to each other in the auxiliary plant, and installing a crane mechanism on the track assembly, after the spent fuel storage grid 10 is transported to the area below the hoisting opening 5 of the auxiliary plant by the tilting frame 8 of the transport vehicle 7, the spent fuel storage grid 10 can be placed on the ground by the cooperation of the crane mechanism and the crane below the hoisting opening 5 of the auxiliary plant. The hook of the crane mechanism is connected to the spent fuel storage grid hoisting tool, and then the spent fuel storage grid hoisting tool is connected to the spent fuel storage grid 10. The crane mechanism can then hoist the spent fuel storage grid 10 into the spent fuel pool 6 at the designated location and then lower it. This method can realize the hoisting and introduction of the spent fuel storage grid 10 after the fuel plant is capped, thus preventing the occurrence of foreign objects falling into the spent fuel storage grid 10 during the pre-capping and commissioning construction stages of the fuel plant, as well as external foreign objects falling into the spent fuel storage grid 10. Moreover, since the fuel plant is capped, the environment is better and rust is less likely to occur.

[0055] In addition, since the spent fuel storage rack 10 was hoisted in after the fuel plant was capped, the time between the pickling and passivation treatment of each storage compartment of the spent fuel storage rack 10 and its initial use is relatively short before it is hoisted in place, making it easier to clean and maintain after the spent fuel storage rack 10 is hoisted in place.

[0056] It should be noted that the track components, spent fuel container crane 1, and fuel grabber 2 inside the fuel plant are all essential equipment during the construction of the fuel plant. The spent fuel container crane 1 and fuel grabber 2 are hoisted onto the track components before the fuel plant is capped to carry out other construction work inside the fuel plant. After the fuel plant is capped, the installation of the spent fuel storage rack 10 begins.

[0057] like Figure 5 As shown, further, the crane mechanism in step S1 includes a spent fuel container crane 1, a fuel grabber 2, and a hand-cranked double-beam trolley 3. The spent fuel container crane 1 and the fuel grabber 2 are arranged sequentially along the length direction of the first track. The fuel grabber 2 is provided with a moving track, and the hand-cranked double-beam trolley 3 is arranged on the moving track. The length direction of the moving track is perpendicular to the length direction of the first track.

[0058] The length direction of the first track is... Figure 7 The east-west direction is the same. The first track, the second track, and the moving track are all parallel to the horizontal plane.

[0059] Specifically, step S1, which involves installing the crane mechanism on the track assembly, includes the following steps:

[0060] S11: Install suspension points on the roof of the auxiliary plant;

[0061] S12: Connect the sling 4 to the hand-cranked double-girder trolley 3, hoist the hand-cranked double-girder trolley 3 onto the moving track on the fuel grabber 2 through the lifting point, and connect it to the fuel grabber 2 through the anti-tipping hook.

[0062] Because the fuel grabber 2 has a rated lifting capacity of 2t, and the spent fuel container crane 1 has a main hook rated lifting capacity of 140t and an auxiliary hook rated lifting capacity of 10t, and both are located on the first track, spanning the entire auxiliary plant, the MH14 crane with a rated lifting capacity of 10t is used on the ground below the lifting port 5 in the auxiliary plant. Therefore, the fuel grabber 2 cannot lift the spent fuel storage rack 10 alone. Thus, a hand-cranked double-girder trolley 3 is installed on the track of the fuel grabber 2, and a sling 4 is installed on the hand-cranked double-girder trolley 3 to lift the spent fuel storage rack 10. Compared to the traditional method of using a 400t crawler crane and a 50t truck crane to lift and introduce the spent fuel storage rack, the current method using the spent fuel container crane 1, fuel grabber 2, and hand-cranked double-girder trolley 3 has lower mechanical costs and higher cost-effectiveness.

[0063] In addition, to prevent the hand-cranked double-beam trolley 3 from tipping over from the fuel grabber 2, anti-tipping hooks are installed to connect the hand-cranked double-beam trolley 3 and the fuel grabber 2 to ensure safety.

[0064] When arranging the sling 4, it should be designed to allow operators standing on the two-person bridge of the fuel grabber to easily pull the second hand chain hoist 401 in the sling 4. Figure 6 As shown, the lifting sling 4 consists of a 20t×6m second hand chain hoist 401, a 20t×6m safety rope 405, a 20t×5m first sling 402, a 20t×10m second sling 403, and two 10t×1.5m third slings 404. The top of the first sling 402 is connected to the hand-cranked double-beam trolley 3 via a 25t shackle. The top of the second hand chain hoist 401 is connected to the bottom of the first sling 402, and its bottom is connected to the top of the second sling 403. The two third slings 404 are connected to the bottom of the second sling 403 via a 25t shackle. The two third slings 404 are used to lift the spent fuel storage grid lifting tool.

[0065] like Figure 2 - Figure 4 As shown, according to one embodiment of the present invention, step S2, which involves placing the spent fuel storage rack 10 onto the tipping frame 8 of the transport vehicle 7 and transporting it by the transport vehicle 7 to the area below the auxiliary plant hoisting opening 5, includes the following steps:

[0066] S21: After removing the outer packaging box of the spent fuel storage rack 10 and hoisting the tipping frame 8 into place on the transport vehicle 7, place the spent fuel storage rack 10 onto the tipping frame 8.

[0067] S22: Secure the spent fuel storage rack 10 and the transport vehicle 7 with the first sealing belt, secure the spent fuel storage rack 10 and the tipping frame 8 with the second sealing belt, transport the transport vehicle 7 to the bottom of the auxiliary plant hoisting port 5, and release the first sealing belt.

[0068] Due to the considerable height of the spent fuel storage rack 10, it is transported horizontally by the transport vehicle 7 to improve stability and prevent tipping. To facilitate subsequent operations to prevent the rack from falling to the ground, a tipping frame 8 is placed on the transport vehicle 7. The tipping frame 8 is L-shaped, with the long side of the spent fuel storage rack 10 aligned with the long side of the L-shaped frame, facilitating lifting and placement of the rack onto the ground. A first sealing strip further ensures that the tipping frame 8 carrying the spent fuel storage rack 10 is not prone to tipping over, and a second sealing strip further ensures that the spent fuel storage rack 10 will not tip over on the tipping frame 8.

[0069] Of course, the spent fuel storage rack 10 can also be transported vertically. In this case, it is not necessary to use the MH14 crane and the spent fuel container crane 1 to flip it over, which saves work and improves construction efficiency.

[0070] like Figure 4 As shown, according to one embodiment of the present invention, in step S3, the spent fuel storage rack 10 is placed on the ground by the crane mechanism on the track assembly cooperating with the crane below the auxiliary plant hoisting port 5, including the following steps:

[0071] S31: Four counterweights 9 are arranged below the hoisting port 5 of the auxiliary plant, and a first hand chain hoist 12 is connected to each counterweight 9;

[0072] S32: After flipping the spent fuel storage rack 10 from horizontal to vertical by connecting the hook of the spent fuel container crane 1 and the hook of the MH14 crane below the auxiliary plant hoisting port 5 to the first hoisting point 801 and the second hoisting point 802 in the tilting frame 8 respectively, each first hand chain hoist 12 is connected to the lifting lug plate 11 on the tilting frame 8.

[0073] S33: Place the flipped vertical spent fuel storage rack 10 on the ground and adjust the first hand chain hoist 12 to tighten the tilting frame 8.

[0074] Specifically, the hook of the spent fuel container crane 1 is connected to the first lifting point 801 on the tilting frame 8, and the hook of the MH14 crane is connected to the second lifting point 802 on the tilting frame 8. The tilting frame 8, carrying the spent fuel storage rack 10, is lifted. The hook of the spent fuel container crane 1 is slowly raised, and before the spent fuel storage rack 10 is tilted to a vertical position (approximately at a 30° angle to the vertical position), the lifting of the hook of the spent fuel container crane 1 is stopped. The spent fuel container crane 1 and the MH14 crane then lower their hooks synchronously. After the lowest point of the tilting frame 8 is close to the ground, the hook of the spent fuel container crane 1 is raised again, with the MH14 crane cooperating to complete the tilting and erection of the spent fuel storage rack 10. Because the spent fuel storage rack 10 is connected to the tilting frame 8 by multiple second sealing straps, swaying of the spent fuel storage rack 10 during its tilting process is prevented.

[0075] The first chain hoist 12 can be used to tighten the tilting frame 8, which is placed on the ground and carries the spent fuel storage rack 10, so as to prevent the spent fuel storage rack 10 from becoming unstable and tipping over after it is tilted and erected.

[0076] According to one embodiment of the present invention, between steps S2 and S3, the following step is further included:

[0077] Two sets of scaffolding were erected in the container washing pool 13 on one side of the spent fuel water pool 6, and spent fuel storage grid hoisting tools were assembled.

[0078] Since the spent fuel storage grid lifting tool consists of a rectangular frame and four hanging chains connected around the rectangular frame, the spent fuel container crane 1 can easily lift the spent fuel storage grid lifting tool by erecting scaffolding.

[0079] After the above-mentioned preparatory work for hoisting the spent fuel storage rack 10 to the ground below the hoisting port 5 of the auxiliary plant is completed, such as Figure 5 and Figure 7 As shown, since the fuel grabber 2 and the spent fuel container crane 1 share the same track in the auxiliary plant area of ​​the fuel plant, both located on the first track, and the fuel grabber 2 still needs to perform fuel grabbing operations, it cannot be removed. The spent fuel container crane 1 can only move within area B, and its movement range is limited. Three rows of spent fuel storage racks 10 need to be installed from west to east in the spent fuel pool 6. Therefore, the spent fuel pool 6 is designated as the first installation area, the second installation area, and the third installation area from west to east. The spent fuel storage racks 10 installed in the first and second installation areas cannot be directly lifted into place by the spent fuel container crane 1. They require secondary lifting using the fuel grabber 2, which can move within area A, and the hand-cranked double-beam trolley 3 to lift the spent fuel storage racks 10 into place. Therefore, there are two lifting scenarios when lifting the spent fuel storage racks 10 into the spent fuel pool 6:

[0080] Scenario 1: When the area where the spent fuel storage rack 10 is placed is within the movement range of the spent fuel container crane 1 (i.e., the installed spent fuel storage rack 10 is located in the third row of installation areas), in step S4, the crane mechanism hook is connected to the spent fuel storage rack lifting tool, then the spent fuel storage rack lifting tool is installed on the spent fuel storage rack 10, the spent fuel storage rack 10 is lifted by the crane mechanism and moved along the track assembly to the designated position above the spent fuel pool 6, and then the spent fuel storage rack 10 is lowered, including the following steps:

[0081] Connect the hook of the spent fuel container crane 1 to the spent fuel storage grid lifting tool. Use the spent fuel container crane 1 to lift the spent fuel storage grid lifting tool to the spent fuel storage grid 10. Connect the spent fuel storage grid lifting tool to the spent fuel storage grid 10. Release the second sealing belt. Use the spent fuel container crane 1 to lift the spent fuel storage grid 10 and move it along the track assembly to the designated position above the spent fuel pool 6. Then lower the spent fuel storage grid 10.

[0082] Step S5 involves disconnecting the crane hook from the spent fuel storage grid lifting tool and dismantling the spent fuel storage grid lifting tool, including:

[0083] Remove the spent fuel storage grid hoisting tool from the installed spent fuel storage grid 10, and use the spent fuel container crane 1 to put the spent fuel storage grid hoisting tool back onto the scaffolding. Then, release the hook of the spent fuel container crane 1 and the spent fuel storage grid hoisting tool.

[0084] Scenario 2: When the area where the spent fuel storage rack 10 is placed is outside the movement range of the spent fuel container crane 1 (i.e., the installed spent fuel storage rack 10 is located within the first and second row installation areas), in step S4, the crane mechanism hook is connected to the spent fuel storage rack lifting tool, then the spent fuel storage rack lifting tool is installed on the spent fuel storage rack 10, the spent fuel storage rack 10 is lifted by the crane mechanism and moved along the track assembly to above the designated location of the spent fuel pool 6, and then the spent fuel storage rack 10 is lowered, including:

[0085] S41: Connect the hook of the spent fuel container crane 1 to the spent fuel storage grid lifting tool, use the spent fuel container crane 1 to lift the spent fuel storage grid lifting tool to the spent fuel storage grid 10, connect the spent fuel storage grid lifting tool to the spent fuel storage grid 10, release the second sealing belt, use the spent fuel container crane 1 to lift the spent fuel storage grid 10, and move it along the track assembly to a position close to the fuel grabber 2, that is, lift the spent fuel storage grid 10 into the third row installation area in the spent fuel pool 6, and make its north-south distance from the pool as consistent as possible with the final placement position, and remove the hook of the spent fuel container crane 1;

[0086] S42: Connect the special lifting tool for the fuel storage rack to the sling 4 of the hand-cranked double-beam trolley 3. Use the second hand-operated hoist 401 in the sling 4 to lift the spent fuel storage rack 10 50mm above the bottom of the spent fuel pool 6. Use the fuel grabber 2 to drive the hand-cranked double-beam trolley 3 to move along the track assembly. Use the hand-cranked double-beam trolley 3 to move along the moving track on the fuel grabber 2 to move the spent fuel storage rack 10 to the designated position above the spent fuel pool 6. Then lower the spent fuel storage rack 10.

[0087] By aligning the distance between the fuel grabber 2 and the water tank in the north-south direction as closely as possible to the final positioning location in step S41, the travel distance of the hand-cranked double-beam trolley 3 on the moving track can be reduced.

[0088] Step S5 involves disconnecting the crane hook from the spent fuel storage grid lifting tool and dismantling the spent fuel storage grid lifting tool, including:

[0089] Remove the spent fuel storage grid hoisting tool from the installed spent fuel storage grid 10. Move the spent fuel storage grid hoisting tool to the scaffolding using the sling 4 on the hand-cranked double-beam trolley 3. Disconnect the sling 4 on the hand-cranked double-beam trolley 3 from the spent fuel storage grid hoisting tool.

[0090] According to one embodiment of the present invention, after all spent fuel storage racks 10 have been hoisted in, the hand-cranked double-beam trolley 3 is removed and moved away using the hoisting points on the roof.

[0091] It should be noted that when installing the spent fuel storage racks 10, the spent fuel storage racks 10 located in the first row of installation areas are installed first, the spent fuel storage racks 10 located in the second row of installation areas are installed second, and the spent fuel storage racks 10 located in the third row of installation areas are installed last.

[0092] In the description of this invention, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0093] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for installing spent fuel storage racks, characterized in that, The installation process includes the following steps: S1: Install a track assembly in the auxiliary workshop. The track assembly includes a first track and a second track that are set vertically. Install a crane mechanism on the track assembly. The crane mechanism includes a spent fuel container crane (1), a fuel grabber (2), and a hand-cranked double beam trolley (3). The spent fuel container crane (1) and the fuel grabber (2) are arranged sequentially along the length direction of the first track. The fuel grabber (2) is equipped with a moving track, and the hand-cranked double beam trolley (3) is set on the moving track. The length direction of the moving track is perpendicular to the length direction of the first track. S2: Place the spent fuel storage rack (10) on the tipping frame (8) of the transport vehicle (7) and transport it to the bottom of the auxiliary plant hoisting port (5) via the transport vehicle (7); S3: The spent fuel storage rack (10) is placed on the ground by cooperating with the crane mechanism on the track assembly and the crane below the auxiliary plant hoisting port (5); S4: Connect the crane mechanism hook to the spent fuel storage grid lifting tool, then install the spent fuel storage grid lifting tool on the spent fuel storage grid (10), lift the spent fuel storage grid (10) by the crane mechanism and move it along the track assembly to the designated position above the spent fuel pool (6), and then lower the spent fuel storage grid (10). S5: Disconnect the crane mechanism hook from the spent fuel storage grid lifting tool, remove the spent fuel storage grid lifting tool, and proceed with the lifting and introduction of the next spent fuel storage grid (10).

2. The method for installing spent fuel storage racks according to claim 1, characterized in that, The installation of the crane mechanism on the track assembly in step S1 includes the following steps: S11: Install suspension points on the roof of the auxiliary plant; S12: Connect the sling (4) to the hand-cranked double beam trolley (3), hoist the hand-cranked double beam trolley (3) onto the moving track on the fuel grabber (2) through the lifting point, and connect it to the fuel grabber (2) through the anti-overturn hook.

3. The method for installing spent fuel storage racks according to claim 1, characterized in that, The steps in step S2, which involve placing the spent fuel storage rack (10) onto the tipping frame (8) of the transport vehicle (7) and transporting it by the transport vehicle (7) to the area below the hoisting opening (5) of the auxiliary plant, include the following steps: S21: After removing the outer packaging box of the spent fuel storage rack (10) and hoisting the tipper (8) onto the transport vehicle (7), place the spent fuel storage rack (10) onto the tipper (8); S22: Secure the spent fuel storage rack (10) and the transport vehicle (7) with the first sealing belt, secure the spent fuel storage rack (10) and the tilting frame (8) with the second sealing belt, transport the transport vehicle (7) to the bottom of the auxiliary plant hoisting port (5), and release the first sealing belt.

4. The method for installing spent fuel storage racks according to claim 1, characterized in that, In step S3, the spent fuel storage rack (10) is placed on the ground by the crane mechanism on the track assembly in cooperation with the crane below the auxiliary plant hoisting port (5), including the following steps: S31: Four counterweights (9) are arranged below the hoisting port (5) of the auxiliary plant, and a first hand chain hoist (12) is connected to each counterweight (9). S32: After the spent fuel storage rack (10) is flipped from horizontal to vertical by connecting the hook of the spent fuel container crane (1) and the hook of the MH14 crane below the auxiliary plant lifting port (5) to the first lifting point (801) and the second lifting point (802) in the tilting frame (8) respectively, each first hand chain hoist (12) is connected to the lifting lug plate (11) on the tilting frame (8); S33: Place the flipped vertical spent fuel storage rack (10) on the ground and adjust the first hand chain hoist (12) to tighten the tilting frame (8).

5. The method for installing spent fuel storage racks according to claim 1, characterized in that, Between steps S2 and S3, the following steps are also included: Two sets of scaffolding were erected in the container cleaning pool (13) on one side of the spent fuel water pool (6), and spent fuel storage grid hoisting tools were assembled.

6. The method for installing spent fuel storage racks according to claim 5, characterized in that, In step S4, the crane hook is connected to the spent fuel storage grid lifting tool, the spent fuel storage grid lifting tool is then installed on the spent fuel storage grid (10), the spent fuel storage grid (10) is lifted by the crane mechanism and moved along the track assembly to the designated position above the spent fuel pool (6), and then the spent fuel storage grid (10) is lowered, including the following steps: Connect the hook of the spent fuel container crane (1) to the spent fuel storage grid lifting tool, lift the spent fuel storage grid lifting tool to the spent fuel storage grid (10) using the spent fuel container crane (1), connect the spent fuel storage grid lifting tool to the spent fuel storage grid (10), release the second sealing belt, lift the spent fuel storage grid (10) using the spent fuel container crane (1), and move it along the track assembly to the designated position above the spent fuel pool (6), and then lower the spent fuel storage grid (10).

7. The method for installing spent fuel storage racks according to claim 5, characterized in that, In step S4, the crane hook is connected to the spent fuel storage grid lifting tool, then the spent fuel storage grid lifting tool is installed on the spent fuel storage grid (10), the spent fuel storage grid (10) is lifted by the crane mechanism and moved along the track assembly to a designated position above the spent fuel pool (6), and then the spent fuel storage grid (10) is lowered, including: S41: Connect the hook of the spent fuel container crane (1) to the spent fuel storage rack lifting tool, lift the spent fuel storage rack lifting tool to the spent fuel storage rack (10) using the spent fuel container crane (1), connect the spent fuel storage rack lifting tool to the spent fuel storage rack (10), release the second sealing belt, lift the spent fuel storage rack (10) using the spent fuel container crane (1), and move it along the track assembly to a position close to the fuel grabber (2), and remove the hook of the spent fuel container crane (1); S42: Connect the special lifting tool for the fuel storage rack to the sling (4) of the hand-cranked double beam trolley (3), drive the hand-cranked double beam trolley (3) to move along the track assembly by the fuel grabber, and move the hand-cranked double beam trolley (3) along the moving track on the fuel grabber (2) to move the spent fuel storage rack (10) to the designated location above the spent fuel pool (6), and then lower the spent fuel storage rack (10).

8. The method for installing spent fuel storage racks according to claim 6, characterized in that, In step S5, disconnecting the crane hook from the spent fuel storage grid lifting tool and dismantling the spent fuel storage grid lifting tool includes: Remove the spent fuel storage grid hoisting tool from the installed spent fuel storage grid (10), and use the spent fuel container crane (1) to put the spent fuel storage grid hoisting tool back onto the scaffolding. Then, release the hook of the spent fuel container crane (1) and the spent fuel storage grid hoisting tool.

9. The method for installing spent fuel storage racks according to claim 7, characterized in that, In step S5, disconnecting the crane hook from the spent fuel storage grid lifting tool and dismantling the spent fuel storage grid lifting tool includes: Remove the spent fuel storage grid hoisting tool from the installed spent fuel storage grid (10), and move the spent fuel storage grid hoisting tool to the scaffolding by using the sling (4) on the hand-cranked double beam trolley (3). Disconnect the sling (4) on the hand-cranked double beam trolley (3) from the spent fuel storage grid hoisting tool.

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