Method for replacing filter element of offshore nuclear power platform

Abstract

The present invention relates to a filter element replacement method for an offshore nuclear power platform. The replacement device includes a hoisting device, a temporary shielding cover, a temporary replacement cover, and a shielding box. The temporary shielding cover is used to cover a replacement station where a filter element to be replaced is stored. The temporary shielding cover includes a seat body and a first cover body. A through hole is provided in the middle of the seat body, and the first cover body can be installed on the seat body in a sideways detachable manner. The temporary replacement cover can be detachably covered on the through hole. The temporary replacement cover is located outside the first cover body. The temporary replacement cover is provided with a disassembly hole that can be opened and closed, and a disassembly tool can be inserted to remove the container cover of the filter element to be replaced. The shielding box includes a cover body used to cover the seat body, and a second cover body that can be laterally withdrawn and arranged at the lower end of the cover body. A hanging hole for the hanging wire of the hoisting device to pass through is provided on the upper side of the cover body, so as to hang the filter element to be replaced in the replacement station into the cover body and transport it with the shielding box. During the replacement process, external radiation can be reduced and the space required for replacement can be compressed.

Description

Technical Field

[0001] The invention relates to the field of nuclear power, and more specifically to a method for replacing a filter element of an offshore nuclear power platform. Background Art

[0002] The temporary storage pool for waste filter elements is located in Room 12374 of the auxiliary plant. The bottom elevation of the storage pool is EL 100' and the top elevation is EL 110'. The waste filter element transfer process studied in this paper refers to the transfer of waste filter elements of different elevations (82'6", 107'2" and 135'3") to the waste filter element storage pool with an elevation of 110'.

[0003] The transfer of waste filter elements mainly includes two parts: one part is to transfer the waste filter elements from the room where the filter is located to the waste filter element storage pool; the other part is to transfer the waste filter elements from the storage pool to the plant site waste treatment facility SRTF after being stored for a period of time.

[0004] This paper only studies the operation process of the former, while the latter belongs to the category of radioactive solid waste treatment in nuclear power plants. The waste filter element transfer equipment consists of an MH60 trolley and an MR40 shielding container, and its size limitation and shielding performance are mainly considered during design.

[0005] The eight filters are located at three different elevations (EL82'6", 107'2", 135'3"), while the waste filter storage pool is located at EL 110'. By analyzing the system layout of the power plant, the waste filter transfer process lines at the above three elevations are sorted out, and the waste filter shipping operation process is designed. The transportation of waste filter elements has a high radiation risk. During the entire process of transportation, the principle of "safety first" should be followed, radiation protection measures must be comprehensive, and radiation protection supplies must be sufficient. Before transportation, the contact dose rate and surface contamination of the shielding container are tested, and decontamination or other measures are taken to avoid or reduce the spread of loose contamination.

[0006] The structure is suitable for onshore piles, which contain equipment such as waste filter storage pools, and is inconsistent with the filter replacement solution used on offshore platforms. At the same time, the overall system occupies a large space. The offshore pile has a small space and is difficult to arrange.

[0007] The use, storage and transportation routes of waste filter elements are relatively scattered, and different filters are set up with storage rooms at different heights, which does not conform to the actual situation of offshore platforms. At the same time, the scattered use, storage and transportation locations will increase the operating time of personnel. The waste filter elements have high radioactivity, and the long transportation process will increase the radiation dose received by the operators.

[0008] The shielding material itself has a large weight, and each filter is equipped with a special shielding box, which makes the system as a whole bulky, not conducive to use on offshore platforms and affects the center of mass position of the offshore platform. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a method for replacing a filter element of an offshore nuclear power platform in view of the above-mentioned defects of the prior art.

[0010] The technical solution adopted by the present invention to solve the technical problem is: constructing a filter element replacement device for an offshore nuclear power platform, including a hoisting device, a temporary shielding cover, a temporary replacement cover, and a shielding box;

[0011] The temporary shielding cover is used to cover the replacement station where the filter element to be replaced is stored;

[0012] The temporary shielding cover comprises a base body and a first cover body, a through hole is provided in the middle of the base body, and the first cover body is installed on the base body so as to be laterally detachable;

[0013] The temporary replacement cover is detachably covered on the through hole, the temporary replacement cover is located outside the first cover body, and the temporary replacement cover is provided with an openable and closable disassembly hole for inserting a disassembly tool to disassemble the container cover of the filter element to be replaced;

[0014] The shielding box includes a cover body used to cover the base body, and a second cover body that can be laterally pulled out and arranged at the lower end of the cover body. The upper side of the cover body is provided with a hanging hole for the hanging line of the hanging device to pass through, so as to hang the filter element to be replaced in the replacement station into the cover body and transport it with the shielding box.

[0015] In some embodiments, a first slot for the first cover to be inserted into is formed on a side surface of the base body, and after the first cover is inserted into the base body, the through hole is closed.

[0016] In some embodiments, the lower end circumference of the side wall surface of the temporary replacement cover is inclined toward the middle, and the upper end inner wall surface of the through hole is provided with a conical surface that matches the side wall surface of the second cover body.

[0017] In some embodiments, the temporary replacement cover includes an upper cover plate and a lower cover plate, the lower cover plate is rotatably arranged on the upper side of the upper cover plate, the lower cover plate is provided with a plurality of unlocking holes opposite to the bolts on the filter element to be replaced, the upper cover plate is provided with adjustment holes, and the upper cover plate is rotated so that the adjustment holes are opposite to the unlocking holes to form the open disassembly hole for the disassembly tool to be inserted to remove the bolts on the filter element to be replaced.

[0018] In some embodiments, a second slot is provided on the side surface of the lower end of the cover body for the second cover body to be inserted into, and after the second cover body is inserted into the second cover body, the lower end of the cover body is closed.

[0019] A filter element replacement method using an offshore nuclear power platform filter element replacement device, characterized in that it comprises the steps of:

[0020] S1, placing the temporary shielding cover on the opened replacement station;

[0021] S2, placing the temporary replacement cover on the through hole, removing the first cover body, inserting a disassembly tool into the disassembly hole, and removing the container cover of the filter element to be replaced in the replacement station;

[0022] S3, removing the temporary replacement cover and container cover;

[0023] S4, placing the shielding box on the base, removing the second cover, and connecting the cover to the replacement station;

[0024] S5, lifting the filter element to be replaced into the cover body, installing the second cover body to the cover body, and removing the shielding box containing the filter element to be replaced;

[0025] S6. Hoisting the new filter element to the replacement station;

[0026] S7. Hoist the container cover into the replacement station and lock it onto the new filter element.

[0027] In some embodiments, in the step S3, after removing the temporary replacement cover and the container cover, the first cover is installed on the base;

[0028] In the step S4, after the shielding box is placed on the base, the first cover is removed.

[0029] In some embodiments, in the step S5, after the shielding box containing the filter element to be replaced is removed, the first cover is installed on the base;

[0030] In step S6, the first cover is opened, and a new filter element is hoisted into the replacement station.

[0031] In some embodiments, in step S6, after hoisting a new filter element into the replacement station, the first cover body is installed on the base body.

[0032] In some embodiments, in the step S1, after opening the module cover of the replacement station, the temporary shielding cover is placed on the opened replacement station;

[0033] In the step S7, after the container cover is locked to the new filter element, the module cover is installed.

[0034] The filter element replacement device and replacement method for an offshore nuclear power platform implemented in the present invention have the following beneficial effects: through the replacement device, during the process of removing the filter element to be replaced and installing a new filter element, isolation from the outside can be guaranteed as much as possible, external radiation can be reduced, and the exposure dose of the staff can be reduced. During the replacement process, small space is occupied, allowing the offshore platform filter element replacement equipment to be compactly arranged, compressing the overall layout space required for replacing the filter element, and improving the economy of the platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0036] Figure 1 is a schematic diagram of the layout of an offshore nuclear power platform in an embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure after the module cover of the replacement station is opened;

[0038] Figure 3 It is a schematic diagram of the structure when the temporary shielding cover is set to the replacement station;

[0039] Figure 4 is a schematic diagram of the structure when the temporary replacement cover is set to the through hole of the temporary shielding cover;

[0040] Figure 5 is removed Figure 4 A schematic diagram of inserting a disassembly tool into the disassembly opening to disassemble the container cover after the first cover body is inserted;

[0041] Figure 6 yes Figure 5 A schematic diagram of installing the first cover body and the shielding box after the container cover and the temporary replacement cover are removed;

[0042] Figure 7 yes Figure 6 A schematic diagram of installing a new filter element after the first cover and shielding box are removed;

[0043] Figure 8 is Figure 7 Schematic diagram of locking the container cover after the new filter element is installed;

[0044] Fig. 9 This is a schematic diagram of the module cover after the new filter element is installed. DETAILED DESCRIPTION

[0045] 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.

[0046] like Figures 1 to 9As shown, a filter element replacement device for an offshore nuclear power platform in a preferred embodiment of the present invention includes a platform 1, and a lifting device 2, a temporary shielding cover 3, a temporary replacement cover 4, and a shielding box 5 arranged on the platform 1. A special space can be set in the platform 1 for installing the replacement device and storing the replaced discarded filter elements 6.

[0047] like Figure 3 As shown, the temporary shielding cover 3 is used to cover the replacement station 7 storing the filter element 71 to be replaced. Further, the temporary shielding cover 3 includes a seat body 31 and a first cover body 32. A through hole 311 is provided in the middle of the seat body 31, and the first cover body 32 can be installed on the seat body 31 in a sideways manner to realize the opening and closing of the through hole 311.

[0048] like Figure 4 As shown, the temporary replacement cover 4 can be detachably covered on the through hole 311, and the temporary replacement cover 4 is located on the outside of the first cover body 32. After the temporary replacement cover 4 is covered on the through hole 311, the first cover body 32 can be moved out to keep the through hole 311 in a closed state, thereby reducing the amount of external radiation.

[0049] like Figure 5 As shown, the temporary replacement cover 4 is provided with an openable and closable disassembly hole for inserting a disassembly tool 8 to disassemble the container cover 72 of the filter element to be replaced 71. When the disassembly hole is opened, the disassembly tool 8 is inserted into the disassembly container cover 72, and after the disassembly is completed, the disassembly hole is closed to prevent the filter element to be replaced 71 from radiating outward and reduce the radiation amount.

[0050] like Figure 6 As shown, further, the shielding box 5 includes a cover body 51 for covering the seat body 31, and a second cover body 52 which can be laterally pulled out and arranged at the lower end of the cover body 51. The upper side of the cover body 51 is provided with a hanging hole 511 for the hanging line of the hanging device 2 to pass through, so that after the hanging rope passes through the hanging hole 511, the filter element 71 to be replaced in the replacement station 7 can be hung into the cover body 51 and transported with the shielding box 5.

[0051] like Figure 7 , 8 As shown, after removal, a new filter element 73 can be installed in the replacement station 7. During the installation of the new filter element 73, the first cover body 32 can control the isolation of the replacement station 7 from the outside. Through the replacement device, during the removal of the filter element 71 to be replaced and the installation of the new filter element 73, isolation from the outside can be ensured as much as possible, thereby reducing external radiation and reducing the exposure dose of the staff.

[0052] Furthermore, in this embodiment, the platform 1 is an offshore platform, the lifting device 2 can be a crane, etc., and the platform 1 is also provided with a transfer rail 11, a transfer body 12, and a waste container 13. Preferably, the waste container 13, the lifting device 2, the replacement station 7, and the transfer body 12 are arranged along the transfer rail 11, so that the lifting device 2 can lift the various components and filter elements of the device and then transfer them to a suitable position along the transfer rail 11, thereby improving efficiency, reducing operation time, and reducing the radiation dose to the staff.

[0053] Preferably, all medium and high radioactive filters that require filter element replacement on the offshore platform 1 are centrally arranged, and a waste container 13 for storing waste filter elements and a waste filter element processing and packaging device are arranged at the same location, and space for filter element replacement and transportation is reserved on the deck above the arrangement location, which solves the problem of compact arrangement of filter element replacement equipment on the offshore platform 1, compresses the overall arrangement space required for filter element replacement, and improves the economy of the platform 1.

[0054] Combination Figure 3 As shown, in some embodiments, in order to facilitate the disassembly and assembly of the first cover body 32, a first slot 312 for the first cover body 32 to be inserted is opened on the side of the base body 31 of the temporary shielding cover 3. After the first cover body 32 is inserted, the through hole 311 is closed to prevent radiation from leaking outward. When the through hole 311 needs to be opened, the first cover body 32 is pulled out, making it convenient to open and close the through hole 311.

[0055] Combination Figure 4 As shown, further, the lower end circumference of the side wall surface of the temporary replacement cover 4 is inclined toward the middle, and the upper end inner wall surface of the through hole 311 is provided with a conical surface that matches the side wall surface of the second cover body 52. ​​When the temporary replacement cover 4 is placed on the through hole 311, the two inclined surfaces match to ensure the sealing. After the temporary replacement cover 4 is covered, the first cover body 32 can be removed and the through hole 311 can be covered by the temporary replacement cover 4. In other embodiments, the circumference of the inner wall surface of the through hole 311 can also be provided with steps for the temporary replacement cover 4 to cover the through hole 311 after it is placed.

[0056] In some embodiments, the temporary replacement cover 4 includes an upper cover plate 41 and a lower cover plate 42, and the lower cover plate 42 is rotatably arranged on the upper side of the upper cover plate 41. Furthermore, the lower cover plate 42 is provided with a plurality of unlocking holes 421 that are opposite to the bolts on the filter element 71 to be replaced, and the upper cover plate 41 is provided with an adjustment hole 411. The upper cover plate 41 is rotated so that the adjustment hole 411 is opposite to the unlocking hole 421 to form the open disassembly hole for the disassembly tool 8 to be inserted to remove the bolts on the filter element 71 to be replaced.

[0057] When disassembly is not required, the upper cover plate 41 can be rotated to stagger the adjustment hole 411 and the unlocking hole 421, so as to achieve a sealing effect and reduce outward radiation.

[0058] Combination Figure 6 As shown, preferably, a second slot 512 for the second cover body 52 to be inserted is provided on the lower end side of the cover body 51 of the shielding box 5. After the second cover body 52 is removed, the filter element 71 to be replaced can be hoisted into the cover body 51. After the second cover body 52 is inserted, the lower end of the cover body 51 is closed to isolate the filter element 71 to be replaced from the outside and reduce external radiation.

[0059] After the filter element 71 to be replaced is removed, a new filter element 73 can be installed in the replacement station 7, and a container cover 72 is installed on the new filter element 73, and finally the module cover 74 of the replacement station 7 is covered to complete the replacement of the filter element.

[0060] In another embodiment of the present application, a replacement method of a filter element replacement device using an offshore nuclear power platform 1 is provided, comprising the steps of:

[0061] S1. Usually, Figure 1 , 2 As shown, when the filter element needs to be replaced, the module cover 74 on the replacement station 7 is first opened, and then the temporary shielding cover 3 is placed on the opened replacement station 7;

[0062] S2, such as Figure 4 , 5 As shown, the temporary replacement cover 4 is placed on the through hole 311, the first cover body 32 is removed, and the disassembly tool 8 is inserted into the disassembly hole to remove the container cover 72 of the filter element 71 to be replaced in the replacement station 7;

[0063] S3, such as Figure 6 As shown, the temporary replacement cover 4 and the container cover 72 are removed;

[0064] S4, placing the shielding box 5 on the base 31, removing the second cover 52, and connecting the cover 51 to the replacement station 7;

[0065] S5, such as Figure 7 As shown, the filter element 71 to be replaced is hoisted into the cover body 51, the second cover body 52 is installed to the cover body 51, and the shielding box 5 with the filter element 71 to be replaced is removed;

[0066] S6, hoisting the new filter element 73 into the replacement station 7;

[0067] S7, such as Figure 8 As shown, the container cover 72 is hoisted into the replacement station 7 and locked onto the new filter element 73.

[0068] The replacement device can minimize the outward radiation during the filter element replacement process. At the same time, combined with the layout on the platform 1, the replacement efficiency is improved.

[0069] Furthermore, in the step S3 , after removing the temporary replacement cover 4 and the container cover 72 , the first cover body 32 is installed on the base body 31 to prevent the interior of the replacement station 7 from radiating outward.

[0070] Preferably, in the step S4 , after the shielding box 5 is placed on the base 31 , the first cover 32 is removed, and the cover 51 is disposed on the through hole 311 , so as to reduce the radiation from the inside of the replacement station 7 to the outside.

[0071] In the step S5 , before removing the shielding box 5 containing the filter element 71 to be replaced, the first cover 32 is installed on the base 31 to reduce the radiation from the inside of the replacement station 7 to the outside.

[0072] In the step S6 , before hoisting the new filter element 73 to the replacement station 7 , the first cover 32 is opened, and then the new filter element 73 is hoisted to the replacement station 7 .

[0073] In the step S6 , after the new filter element 73 is hoisted into the replacement station 7 , the first cover body 32 is installed on the seat body 31 to reduce the radiation from the inside of the replacement station 7 to the outside.

[0074] like Fig. 9 As shown, in the step S7, the first cover body 32 is opened, and after the container cover 72 is locked to the new filter element 73, the module cover plate 74 is installed to complete the replacement of the filter element.

[0075] In some embodiments, all filters, waste filter cartridge storage devices, and waste filter cartridge transfer devices of the offshore platform 1 are centrally arranged in one room, and there is no partition in the room.

[0076] The offshore platform 1 solves the problems of excessive floor space and high shielding setting pressure caused by the dispersed arrangement of filters by optimizing the layout design, thereby improving the spatial economy of the offshore platform 1.

[0077] Optimize the design of the filter element replacement operation path, shorten the work path of the filter element replacement operators, reduce the radiation dose of the workers, and improve the safety of the offshore platform 1.

[0078] By using the replacement device and arrangement means to reduce the shielding material, the shielding mass can be reduced on the basis of meeting the shielding requirements, thereby improving the economic efficiency of the offshore platform 1. At the same time, the lighter shielding mass can alleviate the problem of the center of mass deviation of the platform 1, help improve the stability of the hull, and improve the safety of the offshore platform 1.

[0079] It can be understood that the above-mentioned technical features can be used in any combination without limitation.

[0080] 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 method for replacing a filter element of an offshore nuclear power platform, characterized in that: A filter element replacement device for use on an offshore nuclear power platform, the filter element replacement device comprising a hoisting device (2), a temporary shielding cover (3), a temporary replacement cover (4), and a shielding box (5); the temporary shielding cover (3) is used to cover a replacement station (7) storing a filter element (71) to be replaced; The temporary shielding cover (3) comprises a base body (31) and a first cover body (32); a through hole (311) is provided in the middle of the base body (31); and the first cover body (32) is mounted on the base body (31) so as to be laterally removable; The temporary replacement cover (4) is detachably covered on the through hole (311), the temporary replacement cover (4) is located outside the first cover body (32), and the temporary replacement cover (4) is provided with an openable and closable disassembly hole for inserting a disassembly tool (8) to disassemble the container cover (72) of the filter element (71) to be replaced; The shielding box (5) comprises a cover body (51) for covering the base body (31), and a second cover body (52) which is laterally withdrawn and arranged at the lower end of the cover body (51); a hanging hole (511) is provided on the upper side of the cover body (51) for a hanging wire of a hanging device (2) to pass through, so as to hang the filter element (71) to be replaced in the replacement station (7) into the cover body (51) and transport it with the shielding box (5); A first slot (312) for the first cover (32) to be inserted into is formed on the side surface of the base (31), and after the first cover (32) is inserted into the base, the through hole (311) is closed; The lower end circumference of the side wall surface of the temporary replacement cover (4) is inclined toward the middle, and the upper end inner wall surface of the through hole (311) is provided with a conical surface that matches the side wall surface of the second cover body (52); The temporary replacement cover (4) comprises an upper cover plate (41) and a lower cover plate (42); the lower cover plate (42) is rotatably arranged on the upper side of the upper cover plate (41); the lower cover plate (42) is provided with a plurality of unlocking holes (421) which are opposite to the bolts on the filter element (71) to be replaced; the upper cover plate (41) is provided with an adjustment hole (411); when the upper cover plate (41) is rotated so that the adjustment hole (411) is opposite to the unlocking hole (421), an open disassembly hole is formed for inserting a disassembly tool (8) to remove the bolts on the filter element (71) to be replaced; A second slot (512) for the second cover body (52) to be inserted into is provided on the side surface of the lower end of the cover body (51); after the second cover body (52) is inserted into the cover body, the lower end of the cover body (51) is sealed; The filter element replacement method of the offshore nuclear power platform comprises the following steps: S1, placing the temporary shielding cover (3) on the opened replacement station (7); S2, placing the temporary replacement cover (4) on the through hole (311), removing the first cover body (32), inserting the disassembly tool (8) into the disassembly hole, and removing the container cover (72) of the filter element (71) to be replaced in the replacement station (7); S3, removing the temporary replacement cover (4) and the container cover (72); S4, placing the shielding box (5) on the base (31), removing the second cover (52), and allowing the cover (51) to communicate with the replacement station (7); S5, lifting the filter element (71) to be replaced into the cover body (51), installing the second cover body (52) on the cover body (51), and removing the shielding box (5) containing the filter element (71) to be replaced; S6, hoisting a new filter element (73) into the replacement station (7); S7, hoisting the container cover (72) into the replacement station (7), and locking it onto the new filter element (73).

2. The filter element replacement method for an offshore nuclear power platform according to claim 1, characterized in that: In the step S3, after removing the temporary replacement cover (4) and the container cover (72), the first cover body (32) is installed on the base body (31); In the step S4, after the shielding box (5) is placed on the base (31), the first cover (32) is removed.

3. The filter element replacement method for an offshore nuclear power platform according to claim 1, characterized in that: In the step S5, after the shielding box (5) containing the filter element (71) to be replaced is removed, the first cover body (32) is installed on the base body (31); In step S6, the first cover (32) is opened, and a new filter element (73) is hoisted into the replacement station (7).

4. The filter element replacement method for an offshore nuclear power platform according to claim 3, characterized in that: In the step S6, after the new filter element (73) is hoisted into the replacement station (7), the first cover body (32) is installed on the seat body (31).

5. The filter element replacement method for an offshore nuclear power platform according to claim 1, characterized in that: In the step S1, after opening the module cover (74) of the replacement station (7), the temporary shielding cover (3) is placed on the opened replacement station (7); In the step S7, after the container cover (72) is locked to the new filter element (73), the module cover plate (74) is installed.

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