A radioactive assembly immersion device and method

Abstract

The present application relates to the technical field of nuclear fuel element detection, and particularly relates to a radioactive assembly soaking device and a soaking method. The soaking device comprises: a soaking box body, which is adapted with a water inlet pipe and a water outlet pipe; a sealing cover, which can be opened and closed; a locking mechanism, which is used for fixing the sealing cover on the upper end of the soaking box body; a grab guide plate, which is arranged on the upper part of the soaking box body, and a guide hole for a radioactive assembly grab is arranged in the middle part of the grab guide plate, and the grab guide plate can support the radioactive assembly grab; an assembly guide plate, which is arranged below the grab guide plate, and a through hole for a radioactive rod is arranged in the middle part of the assembly guide plate, and the assembly guide plate can support the radioactive assembly; and a basket, which is hung on the upper end of the assembly guide plate, and the basket can accommodate the disassembled radioactive rods, so that the whole radioactive assembly and the single radioactive rod can be soaked. The soaking method is based on the foregoing soaking device.

Description

Technical Field

[0001] This invention relates to the field of nuclear fuel element testing technology, specifically to a radioactive component immersion device and immersion method. Background Technology

[0002] A radioactive assembly is a component with a structure identical to the control rod assembly in a nuclear power plant. To verify whether the cladding of the assembly has been damaged after irradiation, a damage inspection is required. Since the damage status of a radioactive assembly can only be determined by analyzing the content of radionuclides in a liquid medium, the entire radioactive assembly needs to be immersed in the liquid. Furthermore, after detecting damage to a radioactive assembly, to identify the damaged radioactive rod, it is necessary to immerse the disassembled single or double radioactive rods. Therefore, a specialized immersion device for radioactive assemblies is required. Summary of the Invention

[0003] This invention provides a radioactive component immersion device and immersion method, which can immerse radioactive components and solves the problem of immersing radioactive components in the spent fuel pool of a nuclear power plant.

[0004] This invention is achieved through the following technical solution:

[0005] In a first aspect, the present invention provides a radioactive component immersion device, comprising: an immersion tank, the inner cavity of which is capable of accommodating a radioactive component, the immersion tank being adapted with an inlet pipe and an outlet pipe; a sealing cover, the sealing cover being adapted to the upper end of the immersion tank and capable of being opened and closed; a locking mechanism, the locking mechanism being disposed at the upper end of the immersion tank and used to fix the sealing cover at the upper end of the immersion tank; a gripper guide plate, the gripper guide plate being disposed at the upper part of the immersion tank, the gripper guide plate having a guide hole in the middle for a radioactive component gripper to pass through, and the gripper guide plate being capable of supporting the radioactive component gripper; a component guide plate, the component guide plate being located below the gripper guide plate, the component guide plate having a through hole in the middle for a radioactive rod to pass through, and the component guide plate being capable of supporting the radioactive component; and a basket, the upper end of which is suspended from the component guide plate, and the basket being capable of accommodating the disassembled radioactive rod.

[0006] The radioactive component immersion device provided by this invention includes an immersion tank equipped with an inlet pipe, an outlet pipe, an openable and closable sealing cover, and a locking mechanism for locking the sealing cover. Inside the immersion tank, from top to bottom, are a gripper guide plate and a component guide plate. The gripper guide plate has a guide hole in its center for the radioactive component gripper to pass through, and the component guide plate has a through hole in its center for the radioactive rod to pass through. A basket capable of accommodating disassembled radioactive rods is suspended from the component guide plate. In use, the device is placed in a spent fuel water tank. When immersing the entire radioactive component, the sealing cover is opened, the radioactive component is placed in the immersion tank through the component guide plate, and then the sealing cover is closed and locked. Simultaneously, water is introduced through the inlet pipe to maintain the water pressure inside the immersion tank within a set range, ensuring that the immersion device does not leak in the spent fuel water tank, thus immersing the entire radioactive component. The device also provides good sealing, reducing external interference.

[0007] Meanwhile, when it is necessary to soak a single radioactive rod, open the sealing cover, place the radioactive rod in the basket, then close and lock the sealing cover. At the same time, water is introduced through the water inlet pipe to maintain the water pressure in the soaking tank within the set range, ensuring that the soaking device does not leak in the spent fuel pool, so as to soak the radioactive rod. It also has good sealing performance and can reduce external interference.

[0008] In summary, this invention enables the immersion of entire radioactive components and individual radioactive rods, solving the problem of immersing radioactive components in spent fuel pools at nuclear power plants.

[0009] In an optional embodiment, the lower end of the soaking tank is provided with a slot that can engage with the grid of the spent fuel water tank to ensure the stability of the soaking tank when installed in the spent fuel water tank.

[0010] In an optional embodiment, a sealing ring is adapted to the underside of the sealing cover, the sealing ring being able to seal the gap between the sealing cover and the soaking tank body, so as to ensure that the sealing cover can seal the soaking tank body when closed.

[0011] In an optional embodiment, the sealing ring is made of EPDM rubber to ensure that the sealing ring has sufficient corrosion resistance and high temperature resistance.

[0012] In an optional embodiment, one side of the sealing cap is hinged to the soaking tank; the upper end of the soaking tank is provided with a plurality of locking mechanisms, which correspond one-to-one with the other sides of the sealing cap to ensure that the sealing cap can be tightly pressed against the soaking tank so that the soaking tank does not leak under the set pressure.

[0013] In an optional embodiment, the locking mechanism includes: a locking seat, which is fixedly connected to the corresponding side wall of the soaking tank; a locking bolt, the lower end of which is hinged to the locking seat; and a locking nut, which is screwed to the upper end of the locking bolt. When the sealing cover is closed, tightening the locking nut can lock the sealing cover to the upper end of the soaking tank, facilitating both pressing and releasing the pressure on the sealing cover.

[0014] In an optional embodiment, the locking nut includes a pressure plate and a U-shaped ring, the pressure plate being connected to the locking bolt, and the U-shaped ring being overturned on the pressure plate to facilitate gripping and operation by a hook tool, thereby enabling remote operation of the locking nut.

[0015] In an optional embodiment, the inlet of the inlet pipe and the outlet of the outlet pipe are both located below the gripper guide plate, and the outlet of the inlet pipe and the inlet of the outlet pipe extend to the lower end of the inner cavity of the soaking tank, so as to stir the water in the soaking sampling device evenly and ensure that the water in the soaking device can be drained cleanly during rinsing.

[0016] Secondly, the invention provides a method for immersing radioactive components, based on the aforementioned radioactive component immersion apparatus, comprising the following steps:

[0017] S10. Install the soaking tank into the corresponding grid cell in the spent fuel water tank;

[0018] S20. Open the sealing cover of the soaking tank, insert the radioactive component into the component guide plate, and support the radioactive component through the component guide plate;

[0019] S30. Close the sealing cover and lock it in place using the locking mechanism;

[0020] S40. Water is supplied to the soaking tank through the water inlet pipe, so that the water pressure in the soaking tank is maintained within the set range.

[0021] The radioactive component immersion method provided by this invention involves first installing an immersion tank into the corresponding cell in a spent fuel water pool, then opening the sealing cover of the immersion tank, inserting the radioactive component into the component guide plate, supporting the radioactive component through the component guide plate, then closing the sealing cover and locking it with a locking mechanism, and finally supplying water to the immersion tank through a water inlet pipe to maintain the water pressure inside the immersion tank within a set range, ensuring that the immersion device does not leak in the spent fuel water pool, so as to immerse the entire radioactive component.

[0022] In an optional implementation, a single radioactive rod soaking step is also included:

[0023] S50. Open the sealing cover of the soaking tank and install the basket inside the soaking tank;

[0024] S60. Insert a single radioactive rod into the basket;

[0025] S70. Close the sealing cover and lock it in place using the locking mechanism;

[0026] S80. Water is supplied to the soaking tank through the water inlet pipe, so that the water pressure in the soaking tank is maintained within the set range.

[0027] In other words, the soaking tank is first installed into the corresponding cell in the spent fuel water pool. Then, the sealing cover of the soaking tank is opened, and the basket is installed into the soaking tank in sequence. The single radioactive rod is then inserted into and removed from the basket. The sealing cover is then closed and locked using a locking mechanism. Finally, water is supplied to the soaking tank through the inlet pipe to maintain the water pressure within the soaking tank within a set range, ensuring that the soaking device does not leak in the spent fuel water pool in order to soak the single radioactive component.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] 1. The radioactive component immersion device provided by this invention includes an immersion tank equipped with an inlet pipe, an outlet pipe, an openable and closable sealing cover, and a locking mechanism for locking the sealing cover. The immersion tank contains a gripper guide plate and a component guide plate. The gripper guide plate has a guide hole in its center for the radioactive component gripper to pass through, and the component guide plate has a through hole in its center for the radioactive rod to pass through. A basket capable of accommodating disassembled radioactive rods is suspended from the component guide plate. The radioactive component can be placed in the immersion tank via the component guide plate, and the radioactive rod can be placed in the immersion tank via the basket. Water is supplied through the inlet pipe to maintain the water pressure within the immersion tank within a set range, preventing leakage in the spent fuel pool. Therefore, it can immerse the entire radioactive component and individual radioactive rods, solving the problem of immersing radioactive components in the spent fuel pool of a nuclear power plant.

[0030] 2. The radioactive component immersion method provided by the present invention first installs the immersion tank into the corresponding grid cell in the spent fuel water pool, then opens the sealing cover of the immersion tank, inserts the radioactive component into the component guide plate, and supports the radioactive component through the component guide plate, then closes the sealing cover and locks the sealing cover through the locking mechanism, and finally inputs water into the immersion tank through the water inlet pipe, so that the water pressure in the immersion tank is maintained within the set range, ensuring that the immersion device does not leak in the spent fuel water pool and can immerse the entire radioactive component.

[0031] 3. The radioactive component immersion method provided by the present invention first installs the immersion tank into the corresponding grid cell in the spent fuel water pool, then opens the sealing cover of the immersion tank, sequentially installs the basket into the immersion tank, inserts and removes a single radioactive rod from the basket, closes the sealing cover, and locks the sealing cover with a locking mechanism. Finally, water is introduced into the immersion tank through the water inlet pipe, so that the water pressure in the immersion tank is maintained within a set range, ensuring that the immersion device does not leak in the spent fuel water pool and can immerse a single radioactive component. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] In the attached diagram:

[0034] Figure 1 This is an isometric structural diagram of the radioactive component immersion device according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the lower part of the immersion tank of the radioactive component immersion device according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the upper part of the immersion tank of the radioactive component immersion device according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of the basket of the radioactive component immersion device according to an embodiment of the present invention;

[0038] Figure 5 This is a cross-sectional view of the radioactive component immersion device after the radioactive component has been placed in it, according to an embodiment of the present invention.

[0039] Figure 6 This is a cross-sectional view of the radioactive component immersion device after the disassembled radioactive rods are placed inside, according to an embodiment of the present invention.

[0040] Figure 7 This is a three-dimensional structural diagram of a radioactive component.

[0041] In the attached diagram:

[0042] 10-Immersion tank, 11-Inlet pipe, 12-Outlet pipe, 13-Slot, 20-Sealing cover, 21-Sealing ring, 30-Locking mechanism, 31-Locking seat, 32-Locking bolt, 33-Locking nut, 33a-Pressure plate, 33b-U-ring, 34-Locking support, 40-Grab guide plate, 41-Guide hole, 50-Component guide plate, 51-Through hole, 60-Lifting basket, 61-Lifting ring, 62-Guide tube, 63-Cylinder, 64-Lifting support plate, 65-Connecting hole, 70-Radioactive component, 71-Radioactive rod. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Unless otherwise specified, embodiments and features in the embodiments of this invention can be combined with each other.

[0045] In the description of the embodiments of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of the present invention and to simplify the description, and are not intended to 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 the present invention.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "link" 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 the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Combination Figure 7 It should be noted that the procedure for inspecting radioactive components for damage is as follows:

[0048] 1) The entire radioactive assembly was placed in an immersion sampling device for aspiration testing;

[0049] 2) For undamaged radioactive components, disassemble them, put the disassembled individual radioactive rods into temporary storage containers, and then put them into transport baskets for transportation.

[0050] 3) Disassemble any suspected damaged radioactive components and place the disassembled single radioactive rods into the immersion sampling device, placing two radioactive rods at a time.

[0051] 4) If the radioactive component is undamaged, place the radioactive rod into a temporary storage container.

[0052] 5) If any radioactive components are damaged, inspect each individual radioactive rod.

[0053] 6) Repeat steps 3-5 to inspect all radioactive rods, identify any damaged radioactive rods, pack undamaged radioactive rods into temporary storage containers for transport, and send damaged radioactive rods into the hot chamber for further inspection.

[0054] Therefore, there is a need for a device capable of immersing the entire radioactive assembly and individual radioactive rods. This application provides the following solution:

[0055] Example 1

[0056] Combination Figure 1 This embodiment provides a radioactive component immersion device, including: an immersion tank 10, the inner cavity of which can accommodate a radioactive component 70, the immersion tank 10 being adapted with an inlet pipe 11 and an outlet pipe 12; a sealing cover 20, the sealing cover 20 being adapted to the upper end of the immersion tank 10, and the sealing cover 20 being openable and closable; a locking mechanism 30, the locking mechanism 30 being disposed at the upper end of the immersion tank 10, the locking mechanism 30 being used to fix the sealing cover 20 at the upper end of the immersion tank 10; and a gripper guide plate 40, the gripper guide plate 40 being disposed on the upper end of the immersion tank 10. The upper part of the soaking tank 10 has a guide hole 41 in the middle of the gripper guide plate 40 for the gripper of the radioactive component 70 to pass through, and the gripper guide plate 40 can support the gripper of the radioactive component 70; the component guide plate 50 is located inside the soaking tank 10, and the component guide plate 50 has a through hole 51 in the middle for the radioactive rod 71 to pass through, and the component guide plate 50 can support the radioactive component 70; the basket 60 is suspended from the component guide plate 50 at its upper end, and the basket 60 can accommodate the disassembled radioactive rod 71.

[0057] Combination Figure 2It should be understood that, due to space constraints, the soaking device can only be installed in the fuel storage rack of the spent fuel pool. Considering the manufacturing error of the lower end of the soaking tank 10 and ensuring sufficient space inside the lower end of the tank for storing radioactive components 70, the distance between the lower end of the tank and the fuel storage rack must be controlled at 4.5 ± 0.5 mm, and the internal width must be no less than 200 mm. In this embodiment, a slot 13 is provided at the lower end of the soaking tank 10. The slot 13 can engage with the grid of the spent fuel pool to ensure the stability of the soaking tank 10 installed inside the spent fuel pool.

[0058] Typically, the sealing cap 20 is hinged to the upper end of the immersion tank 10, and the hinge seat limits the rotation angle of the sealing cap 20 to a minimum of 120°, facilitating the closing operation of the sealing cap 20. Combined with... Figure 3 Specifically, a sealing ring 21 is adapted to the lower side of the sealing cover 20. The sealing ring 21 can seal the gap between the sealing cover 20 and the soaking tank 10 to ensure that the sealing cover 20 can seal the soaking tank 10 when closed.

[0059] In this embodiment, a dovetail sealing groove is provided at the lower part of the sealing cover 20 to embed the dovetail-shaped sealing ring 21 into the sealing groove. The material of the sealing ring 21 is EPDM rubber, which has good radiation resistance and long-term performance in high-temperature environments, thereby ensuring that the sealing ring 21 has sufficient corrosion resistance and high-temperature resistance.

[0060] Combined again Figure 1 and Figure 3 The upper end of the soaking tank 10 is provided with a plurality of locking mechanisms 30, and the plurality of locking mechanisms 30 correspond one to one of the other sides of the sealing cover 20 to ensure that the sealing cover 20 can be tightly pressed on the soaking tank 10 so that the soaking tank 10 does not leak under the set pressure.

[0061] Specifically, the locking mechanism 30 includes: a locking seat 31, which is fixedly connected to the side wall of the soaking tank 10; a locking bolt 32, the lower end of which is hinged to the locking seat 31; and a locking nut 33, which is screwed to the upper end of the locking bolt 32. When the sealing cover 20 is closed, tightening the locking nut 33 can lock the sealing cover 20 to the upper end of the soaking tank 10, thus facilitating the pressing and releasing of the sealing cover 20.

[0062] It is understandable that the locking seat 31 is used to support the locking bolt 32. In this embodiment, the locking seat 31 is designed with a stop to limit the rotation angle of the locking bolt 32, which facilitates underwater tightening operations. In order to prevent the locking bolt 32 and the locking nut 33 from seizing, the locking bolt 32 and the locking nut 33 are fitted with coarse threads and are made of two different stainless steel materials with different hardness.

[0063] Meanwhile, a locking support 34 is also provided on the soaking tank 10. The locking support 34 is welded to the sealing cover 20 as a whole. The upper part of the locking support 34 is designed with a chamfer to facilitate the entry of the locking nut 33. The internal dimension of the locking support 34 is larger than the diameter of the locking nut 33. The opening dimension of the locking support 34 is larger than the diameter of the locking bolt 32 and smaller than the diameter of the locking nut 33. After tightening, it can prevent the locking nut 33 from loosening due to radial force.

[0064] Furthermore, the locking nut 33 includes a pressure plate 33a and a U-shaped ring 33b. The pressure plate 33a is connected to the locking bolt 32. The U-shaped ring 33b is overturned on the pressure plate 33a to facilitate the gripping and operation of the hook tool, thereby enabling remote operation of the locking nut 33.

[0065] The gripper guide plate 40 serves to provide support and positioning for the special component gripping tool, facilitating the gripping and lowering of the radioactive component 70. The special component gripping tool has two positioning pins at its bottom, so the gripper guide plate 40 is provided with four guide holes 41, and each guide hole 41 has a chamfered upper part, so that the gripping tool can be positioned in any direction and can accurately enter the guide hole 41 even if there is a deviation.

[0066] Combined again Figure 3 Regarding the component guide plate 50, which provides positioning and guidance for the radioactive component 70, the component guide plate 50 is designed with 24 through holes 51, each with a chamfered top, and a keyway hole in the middle of the component guide plate 50 to provide support for the basket 60. To ensure that the dedicated component gripping tool can successfully grip and lower the component, the distance between the gripper guide plate 40 and the component guide plate 50 should be controlled within a set range.

[0067] Combination Figure 4 Specifically, the suspended basket 60 in this embodiment is composed of a lifting ring 61, a lifting support plate 64, a guide tube 62 and a cylinder 63. The guide tube 62 and the cylinder constrain the lateral movement of a single component rod, while a connecting hole 65 is provided on the cylinder 63 to allow the interior of the suspended basket 60 to communicate with the liquid in the soaking tank 10.

[0068] In addition, the inlet of the water inlet pipe 11 and the outlet of the water outlet pipe 12 are both located below the gripper guide plate 40, and the outlet of the water inlet pipe 11 and the inlet of the water outlet pipe 12 extend to the lower end of the inner cavity of the soaking tank 10, so as to stir the water in the soaking sampling device evenly, and at the same time ensure that the water in the soaking device can be drained cleanly during rinsing.

[0069] Combination Figure 2 In this embodiment, due to space limitations, the inlet and outlet of the soaking tank 10 are both located inside the tank, and its outlet pipe 12 needs to pass through the base first and then enter the base from below.

[0070] The radioactive component immersion device provided in this embodiment is placed in a spent fuel pool during use, combined with... Figure 5 When it is necessary to soak the entire radioactive assembly 70, open the sealing cover 20, place the radioactive assembly 70 into the soaking tank 10 through the assembly guide plate 50, then close and lock the sealing cover 20, and at the same time, water is introduced through the water inlet pipe 11 to maintain the water pressure in the soaking tank 10 within the set range to avoid leakage in the spent fuel water pool, so as to soak the entire radioactive assembly 70, and the good sealing performance can reduce external interference.

[0071] Combination Figure 6 When it is necessary to soak a single radioactive rod 71, open the sealing cover 20, place the radioactive rod 71 in the basket 60, then close the sealing cover 20 and lock it. At the same time, water is introduced through the water inlet pipe 11 to maintain the water pressure in the soaking tank 10 within the set range, so as to avoid leakage in the spent fuel water pool, so as to soak the radioactive rod 71. The sealing is good and can reduce external interference.

[0072] In summary, this embodiment can immerse the entire radioactive assembly 70 and individual radioactive rods 71, solving the problem of immersing the radioactive assembly 70 in the spent fuel pool of a nuclear power plant.

[0073] Example 2

[0074] This embodiment provides a method for immersing radioactive components, based on the radioactive component immersion apparatus described in Embodiment 1, including the following steps:

[0075] S10. Install the soaking tank 10 into the corresponding grid cell in the spent fuel water tank.

[0076] Specifically, the soaking tank 10 needs to be connected to the inlet pipe 11 and the outlet pipe 12. Then, a special hoisting tool is used to connect to the lifting lug at the upper end of the sealing cover 20 to install the soaking tank 10 into a grid cell corresponding to the spent fuel water pool.

[0077] S20. Open the sealing cover 20 of the soaking tank 10, insert the radioactive component 70 into the component guide plate 50, and support the radioactive component 70 through the component guide plate 50.

[0078] Specifically, using a hook tool or other special tool, rotate the locking nut 33 to loosen all three clamping structures, then use a long-handled tool to open the sealing cover 20, and then insert the radioactive component 70.

[0079] The procedure for placing the radioactive component 70 into the immersion tank 10 is as follows:

[0080] 1) Use a special component grasping tool to grasp the radioactive component 70 and put the radioactive component 70 into the grasping device;

[0081] 2) Move to directly above the soaking tank 10. The lower part of the special component gripping tool can enter the upper part of the soaking tank 10 from any direction. Then, lower the special component gripping tool so that the positioning pin of the gripping tool is slowly inserted into the guide hole 41 of the gripper guide plate 40.

[0082] 3) The grabbing tool slowly inserts the radioactive component 70 into the component guide plate 50. If the value of the tension gauge of the special component grabbing tool does not change significantly during the insertion process, it can be determined that each component rod has passed through the through hole 51 on the component guide plate 50 smoothly, and the component is lowered faster.

[0083] 4) After the radioactive component 70 is fully placed into the immersion tank 10, release the special component gripping tool so that the radioactive component 70 sits on the component guide plate 50.

[0084] S30. Close the sealing cover 20 and lock the sealing cover 20 by the locking mechanism 30.

[0085] Specifically, the steps to close the soaking tank 10 are as follows:

[0086] 1) Use a long-handled tool to close the sealing cap 20;

[0087] 2) Use a hook tool to grab the U-shaped ring 33b of the locking nut 33 and rotate it into the groove of the locking support 34;

[0088] 3) Rotate the locking nut 33 to initially fix it, and use a hook tool to fix the remaining two locking mechanisms 30 in turn;

[0089] 4) Tighten the locking nut 33 by rotating it in a crosswise manner in 3 stages to ensure that the sealing ring 21 on the sealing cover 20 is subjected to uniform force and to ensure the sealing performance.

[0090] S40. Water is supplied to the soaking tank 10 through the inlet pipe 11 to maintain the water pressure inside the soaking tank 10 within the set range. That is, the valve at the front end of the outlet pipe 12 is closed, and pressure is applied to the soaking device through the inlet pipe 11 to ensure that the soaking tank 10 does not leak under the set pressure.

[0091] In other words, the radioactive component immersion method provided in this embodiment first installs the immersion tank 10 into the corresponding grid cell in the spent fuel water pool, then opens the sealing cover 20 of the immersion tank 10, inserts the radioactive component 70 into the component guide plate 50, and supports the radioactive component 70 through the component guide plate 50, then closes the sealing cover 20 and locks it through the locking mechanism 30, and finally supplies water to the immersion tank 10 through the water inlet pipe 11, so that the water pressure in the immersion tank 10 is maintained within a set range, ensuring that the immersion device does not leak in the spent fuel water pool, so as to immerse the entire radioactive component 70. Figure 5 ).

[0092] Additionally, if radioactive component 70 is suspected of being damaged, the disassembled individual radioactive rod 71 must be placed into the immersion sampling device. The immersion steps for the individual radioactive rod 71 are as follows:

[0093] S50. Open the sealing cover 20 of the soaking tank 10 and install the basket 60 inside the soaking tank 10.

[0094] Specifically, the steps include:

[0095] S51. After using a hook tool to rotate the tightened nut to loosen all three locking mechanisms 30, use a long-handled tool to open the sealing cover 20.

[0096] S52. Use a long pole lifting tool to grab the lifting ring 61 of the basket 60 and install the basket 60 into the soaking tank 10;

[0097] S53. The radioactive rod 71 is grasped and stored inside the radioactive rod 71 using the radioactive rod 71 grasping tool.

[0098] S60. Insert a single radioactive rod 71 into the basket 60.

[0099] The specific steps are as follows:

[0100] S61. Make contact with and align the lower part of the radioactive rod 71 grasping tool with the guide tube 62 at the upper end of the basket 60, and slowly insert the radioactive rod 71 into the guide tube 62 of the basket 60.

[0101] S62. Repeat S62 and insert another radioactive rod 71 or a simulated rod of radioactive component 70 into the guide tube 62 of the basket 60.

[0102] S70. Close the sealing cover 20 and lock the sealing cover 20 through the locking mechanism 30;

[0103] S80. Water is supplied to the soaking tank 10 through the water inlet pipe 11, so that the water pressure in the soaking tank 10 is maintained within the set range.

[0104] In other words, the soaking tank 10 is first installed into the corresponding grid cell in the spent fuel water pool. Then, the sealing cover 20 of the soaking tank 10 is opened, and the basket 60 is installed into the soaking tank 10 in sequence. The single radioactive rod 71 is then inserted into and removed from the basket 60. The sealing cover 20 is then closed and locked using the locking mechanism 30. Finally, water is supplied to the soaking tank 10 through the water inlet pipe 11, so that the water pressure inside the soaking tank 10 is maintained within a set range, ensuring that the soaking device does not leak in the spent fuel water pool, in order to soak the single radioactive component 70. Figure 6 ).

[0105] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for immersing radioactive components, characterized in that, include: The immersion tank (10) has an inner cavity that can accommodate radioactive components (70). The immersion tank (10) is equipped with an inlet pipe (11) and an outlet pipe (12). The lower end of the immersion tank (10) is provided with a slot (13) that can be engaged with the grid of the spent fuel pool. A sealing cap (20) is adapted to the upper end of the soaking tank (10) and the sealing cap (20) can be opened and closed; A locking mechanism (30) is provided on the upper end of the soaking tank (10) and is used to fix the sealing cover (20) on the upper end of the soaking tank (10); The gripper guide plate (40) is located on the upper part of the soaking tank (10). The gripper guide plate (40) has a guide hole (41) in the middle for the radioactive component gripper to pass through, and the gripper guide plate (40) can support the radioactive component gripper. The component guide plate (50) is located below the gripper guide plate (40). The component guide plate (50) has a through hole (51) in the middle for the radioactive rod (71) to pass through, and the component guide plate (50) can support the radioactive component (70). The upper end of the basket (60) is suspended on the component guide plate (50), and the basket (60) can accommodate the disassembled radioactive rod (71). The inlet of the inlet pipe (11) and the outlet of the outlet pipe (12) are both located below the gripper guide plate (40), and the outlet of the inlet pipe (11) and the inlet of the outlet pipe (12) extend to the lower end of the inner cavity of the soaking tank (10).

2. The radioactive component immersion apparatus according to claim 1, characterized in that, The sealing cover (20) is fitted with a sealing ring (21) on its lower side, and the sealing ring (21) can seal the gap between the sealing cover (20) and the soaking tank (10).

3. The radioactive component immersion apparatus according to claim 2, characterized in that, The sealing ring (21) is made of EPDM rubber.

4. The radioactive component immersion apparatus according to claim 1, characterized in that, The sealing cover (20) is hinged to the soaking tank (10) on one side; the upper end of the soaking tank (10) is provided with a plurality of locking mechanisms (30), and the plurality of locking mechanisms (30) correspond one-to-one with the other sides of the sealing cover (20).

5. The radioactive component immersion apparatus according to claim 1, characterized in that, The locking mechanism (30) includes: Locking seat (31), the locking seat (31) is fixedly connected to the side wall of the soaking tank (10); Locking bolt (32), the lower end of which is hinged to the locking seat (31); A locking nut (33) is screwed to the upper end of the locking bolt (32); When the sealing cover (20) is closed, the sealing cover (20) can be locked at the upper end of the soaking tank (10) by tightening the locking nut (33).

6. The radioactive component immersion apparatus according to claim 5, characterized in that, The locking nut (33) includes a pressure plate (33a) and a U-shaped ring (33b), the pressure plate (33a) being connected to the locking bolt (32), and the U-shaped ring (33b) being overturned on the pressure plate (33a).

7. A method for immersing a radioactive component, based on the radioactive component immersion apparatus according to any one of claims 1 to 6, characterized in that, Includes the following steps: S10. Install the soaking tank (10) into the corresponding grid cell in the spent fuel water tank; S20. Open the sealing cover (20) of the soaking tank (10), insert the radioactive component (70) into the component guide plate (50), and support the radioactive component (70) through the component guide plate (50). S30. Close the sealing cover (20) and lock the sealing cover (20) by the locking mechanism (30); S40. Water is supplied to the soaking tank (10) through the water inlet pipe (11) so that the water pressure in the soaking tank (10) is maintained within the set range.

8. The method for immersing radioactive components according to claim 7, characterized in that, It also includes the step of soaking a single radioactive rod: S50. Open the sealing cover (20) of the soaking tank (10) and install the basket (60) inside the soaking tank (10); S60. Insert a single radioactive rod (71) into the basket (60); S70. Close the sealing cover (20) and lock the sealing cover (20) by the locking mechanism (30); S80. Water is supplied to the soaking tank (10) through the water inlet pipe (11) so that the water pressure in the soaking tank (10) is maintained within the set range.

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