Spent fuel dissolving hanging basket surface residue cleaning device

Abstract

A spent fuel dissolving hanging basket surface residue cleaning device comprises a barrel, a fixing support, a hanging ring, a residue scraping plate, a locking device, a pressing plate and a cleaning ring pipe. The fixed bracket is arranged in the mounting groove, and the fixed bracket is fixedly connected with the lifting ring; the slag scraping plate is matched with the locking device through a mounting hole formed in the slag scraping plate to be placed on the top plate, the locking device comprises a locking bracket, and a locking block, a pin shaft and a pin are mounted on the locking bracket. Through the arrangement of the slag scraping plate, fragments and other residues attached to the outer wall of the dissolving hanging basket can be better cleaned, equipment cannot be damaged, position adjustment and fastening can be conducted through cooperation with the pressing plate and the locking device so that the cleaning effect can be guaranteed, the structure is simple, operation is convenient, the number of maintenance parts is small, replacement is easy, and in daily use, the maintenance cost is low. And the operation time of a dissolution process operation main line is not occupied, and meanwhile, additional radioactive waste is not generated.

Description

Technical Field

[0001] The invention relates to the field of cleaning technology of nuclear fuel dissolution process equipment, and more particularly to a device for cleaning residues on the surface of a spent fuel dissolution hanging basket. Background Art

[0002] The post-processing of spent fuel in power reactors generally adopts the "cut-and-leach" method to dissolve the fuel pellets, while the insoluble fuel cladding and insoluble residues are mostly retained in the basket, thereby achieving the purpose of separating the soluble nuclides in the fuel pellets from the insolubles such as the cladding. In order to improve the dissolution efficiency, the spent fuel assembly will be cut into short segments of a certain length before dissolution, and then enter a special dissolution device to use a dissolving reagent to leaching the core blocks in the fuel cladding. After the dissolving liquid is completely poured out, the insolubles such as the short segments of the cladding will remain in the dissolution basket. The dissolution basket is then taken out, and the cladding, slag, etc. contained in the dissolution basket are subsequently boiled, rinsed, drained and dumped, and then temporarily stored in the basket temporary storage well; while the dissolution basket containing the cladding is transferred out, the empty dissolution basket is put back into the dissolution device to start a new dissolution-related process operation.

[0003] Based on geometric critical safety, the spent fuel dissolution basket is a narrow and long tubular structure with a certain number of holes on the side walls and bottom to ensure that the dissolution reagent can enter the dissolution basket to leach the fuel core blocks in the short section, and at the same time, the dissolved cladding is retained in the basket. Since some cladding fragments are inevitably generated during the mechanical shearing process of the spent fuel assembly, these fragments will adhere to the outer wall of the dissolution basket or partially extend from the holes on the outer wall of the dissolution basket after the cooking, rinsing, draining and dumping processes, causing the large basket to be placed out of place when it returns to the dissolution device, such as: the residue on the surface of the dissolution basket interferes with the pressure measurement of the in-place signal, and the residue adheres to the dissolution basket, causing it to be placed out of place; in addition, these fragments and residues will re-enter the dissolution device and enter the process pipelines and equipment with the dissolving liquid, increasing the risk of blockage.

[0004] Since the dissolution device is an irregular, narrow and long structure, and is in a sealed, highly radioactive environment, it is impossible to directly observe the dissolution basket being placed in the dissolution device. At the same time, combined with the highly radioactive environment and the structure of the dissolution basket, the cleaning of the surface debris of the dissolution basket is difficult and complicated. Therefore, it is very necessary to invent a dissolution basket surface residue cleaning device that is easy to maintain and operate. Summary of the invention

[0005] The purpose of the present invention is to provide a spent fuel dissolution basket surface residue cleaning device to solve the problem of residual debris on the surface of the dissolution basket when it is put back into the dissolution device. The device is easy to operate, can be operated from a distance and is easy to maintain. At the same time, it also provides a verification link for the dissolution basket to be normally placed in the dissolution device, further improving the operational safety.

[0006] The technical solution of the present invention is as follows: a spent fuel dissolution hanging basket surface residue cleaning device, comprising a cylinder, a fixed bracket, a lifting ring, a scraper plate, a locking device, a pressing plate and a cleaning ring pipe; the fixed bracket is arranged in a mounting groove, and the fixed bracket is connected and fixed to the lifting ring; the scraper plate is placed on a top plate through a mounting hole arranged thereon and cooperates with the locking device, and the locking device comprises a locking bracket, and a locking block, a pin shaft and a pin are installed on the locking bracket.

[0007] There are two fixing brackets, which are centrally symmetrically distributed.

[0008] The fixing bracket is provided with a connecting hole, which is connected and fixed with the connecting holes at both ends of the lifting ring through a pin hole.

[0009] The bottom plate of the fixed bracket adopts an L-shaped structure.

[0010] The hanging ring is placed in the installation groove and the top end thereof extends out of the outer edge of the top plate.

[0011] The cleaning ring pipe comprises a ring pipe, a connecting pipe and a quick connector. The ring pipe is installed in a pipe groove, the ring pipe and the connecting pipe are welded, and the other end of the connecting pipe is welded with a socket of the quick connector. The upper and lower surfaces of the inner side of the ring pipe are provided with staggered and evenly arranged circular holes.

[0012] There are three locking devices in total, and they are not collinear.

[0013] The scraper plate can be disassembled or fastened by placing the locking block on the locking device in a vertical state or a horizontal state.

[0014] The scraper plate is pressed and fixed by a pressing plate.

[0015] The scraper plate is made of rubber.

[0016] The remarkable effect of the present invention is that the setting of the scraper plate of the present invention can better clean the debris and other residues attached to the outer wall of the dissolving basket without causing damage to the equipment. By cooperating with the clamping plate and the locking device, the position can be adjusted and tightened to ensure its cleaning effect. It has a simple structure, convenient operation, few maintenance parts and is easy to replace. In daily use, it will not occupy the main line operation time of the dissolving process, and will not generate additional radioactive waste.

[0017] The arrangement of the scraping and grinding cylinder of the present invention restores the key link of the dissolving basket entering the dissolving device without changing the original hot chamber layout and function. The process of operating the dissolving basket through the scraping and grinding cylinder can not only be observed intuitively, but also is conducive to checking and confirming the operating status of related equipment, and can timely identify operation-related hidden dangers and reduce adverse effects on the process system.

[0018] The cleaning ring tube set on the scraper provides a convenient way to clean the dissolving basket under necessary conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the present invention

[0020] Figure 2 A schematic diagram of the structure of the scraping and grinding cylinder of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the locking device of the present invention;

[0022] Figure 4 Schematic diagram of the cleaning component structure of the present invention

[0023] Marks and corresponding parts names in the attached drawings:

[0024] In the figure: 1 scraping cylinder, 2 fixed bracket, 3 lifting ring, 4 scraping plate, 5 locking device, 6 pressing plate, 7 cleaning ring pipe, 8 cylinder body, 9 mounting groove, 10 pipe groove, 11 locking bracket, 12 locking block, 13 pin shaft, 14 pin, 15 ring pipe, 16 connecting pipe, 17 quick connector, 18 top plate. DETAILED DESCRIPTION

[0025] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0026] The terms used in one or more embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of the present application. The singular forms of "a", "said" and "the" used in one or more embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of the present application refers to and includes any or all possible combinations of one or more associated listed items.

[0027] It should be understood that, although the terms first, second, etc. may be used to describe various information in one or more embodiments of the present application, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] like Figures 1 to 4 As shown, the present invention provides a spent fuel dissolution basket surface residue cleaning device, comprising a scraping cylinder 1, a fixed bracket 2, a lifting ring 3, a scraping plate 4 and a pressing plate 6, and a cleaning ring tube 7. The scraping cylinder 1 is placed on the dissolution basket temporary storage well, the barrel 8 of the scraping cylinder 1 is placed in the dissolution basket temporary storage well, and the top plate 18 of the scraping cylinder 1 is placed above the dissolution basket temporary storage well, and the operator can observe; the fixed bracket 2 is set in the installation groove 9 of the scraping cylinder 1, the number of which is two, which are centrally symmetrically distributed, and the fixed bracket 2 is provided with a connecting hole, which is connected and fixed with the connecting holes at both ends of the lifting ring 3 through a pin hole. The lifting ring 3 can be placed in the installation groove 9 of the scraping cylinder 1 and the top end extends out of the outer edge of the top plate 18 of the scraping cylinder 1; the bottom plate of the fixed bracket 2 adopts an L-shaped structure, which is conducive to operating the lifting ring to rotate to a vertical position and can maintain this state, so that the manipulator clamp or the crane hook can directly hook and unhook, which is convenient for remote operation.

[0030] The cleaning ring tube 7 includes a ring tube 15, a connecting tube 16 and a quick connector 17. The upper and lower surfaces of the inner side of the ring tube are provided with staggered and evenly arranged circular holes. The ring tube is installed in the pipe groove 10 of the scraping cylinder 1. The ring tube 15 is welded to the connecting tube 16. The other end of the connecting tube 16 is welded with a socket of the quick connector 17, which can be connected to a plug matching the existing quick connector in the hot chamber, so that different media can be introduced to clean the dissolving hanging basket.

[0031] The scraper plate 4 is placed on the top plate 18 of the scraper tube 1 through the mounting hole provided thereon and in cooperation with the locking device 8. The scraper plate 4 can be disassembled or fastened by operating the locking block 12 on the locking device 5 to a vertical state or a horizontal state, which is simple to operate and convenient for maintenance. The scraper plate 4 is made of rubber material, and the hole shape in the middle is similar to the outer wall of the dissolving hanging basket, and the size is slightly smaller. On the premise that the contact part with the outer wall of the dissolving hanging basket is made of rubber material and the contact friction force is appropriate, combined with the material characteristics of the rubber plate, the scraper plate can be pressed and fixed by the pressing plate 6 when necessary, so that the scraper plate remains relatively stable during the cleaning process of the dissolving hanging basket, thereby improving the cleaning effect.

[0032] During normal use, the spent fuel dissolving basket surface residue is cleaned and placed in the hot chamber basket temporary storage well, and the lifting ring 3 is placed in a horizontal position, and the scraper plate 4 is placed on the upper surface of the scraping tube top plate 18 through the locking block 12 and the locking bracket 11, and the locking block 12 is operated to be tightened in a horizontal state. At this time, the dissolving basket after the waste cladding is dumped can be placed in the scraping tube 1, and the dissolving basket is operated back and forth to pass through the spent fuel dissolving basket surface residue cleaning device several times; at the same time, the operator can observe the dissolving basket passing process through the hot chamber peep window or the camera system to confirm that the dissolving basket and the supporting operating equipment meet the process operation requirements; after the confirmation is completed, the dissolving basket can be temporarily stored in the spent fuel dissolving basket surface residue cleaning device; usually the dissolving device will be equipped with 2-3 dissolving baskets, and the dissolving basket placed in the spent fuel dissolving basket can be placed in the spent fuel dissolving basket surface residue cleaning device after there are no other dissolving baskets in the dissolving device. The dissolving basket in the fuel dissolving basket surface residue cleaning device is transferred into the dissolving device, and the dissolving related process operation is started; when the outer wall of the dissolving basket is still left with residue after being cleaned by the scraper plate 4, and it is observed that it cannot pass normally or be placed in the spent fuel dissolving basket surface residue cleaning device, the plug of the quick connector on the pipeline of the deionized water or acid solution in the hot chamber can be connected to the socket of the quick connector 17 on the cleaning ring tube 7, and the deionized water or acid solution can be used to clean the dissolving basket through the cleaning ring tube 7, and the liquid produced by the cleaning is collected into the floor drain in the temporary storage well or the floor drain in the hot chamber and flows out; if necessary, the compressed air pipeline can also be connected through the quick connector 17 to purge the dissolving basket after the flushing treatment so that it can be further cleaned and dried, and then the dissolving basket is operated to pass through the spent fuel dissolving basket surface residue device to verify the cleaning effect. The specific operation of flushing and drying can be determined in combination with the actual situation on site.

[0033] The above description is only a preferred embodiment of this patent and is not intended to limit this patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this patent should be included in the scope of protection of this patent.

[0034] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0035] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0036] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The optional embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can understand and use the present application well.

Claims

1. A spent fuel dissolution hanging basket surface residue cleaning device, characterized in that: The invention comprises a cylinder (8), a fixed bracket (2), a lifting ring (3), a scraper plate (4), a locking device (5), a pressing plate (6) and a cleaning ring tube (7); the fixed bracket (2) is arranged in a mounting groove (9), and the fixed bracket (2) is connected and fixed to the lifting ring (3); the scraper plate (4) is placed on a top plate (18) in cooperation with the locking device (5) through a mounting hole arranged thereon, and the locking device (5) comprises a locking bracket (11), and a locking block (12), a pin shaft (13) and a pin (14) are installed on the locking bracket (11).

2. The device for cleaning the surface residue of a spent fuel dissolution hanging basket according to claim 1, characterized in that: The number of the fixing brackets (2) is two and they are distributed in a centrally symmetrical manner.

3. The device for cleaning the surface residue of a spent fuel dissolution hanging basket according to claim 1, characterized in that: The fixing bracket (2) is provided with a connecting hole, which is connected and fixed to the connecting holes at both ends of the lifting ring (3) through a pin hole.

4. The device for cleaning the surface residue of a spent fuel dissolution hanging basket according to claim 3, characterized in that: The bottom plate of the fixed bracket (2) adopts an L-shaped structure.

5. The device for cleaning the surface residue of a spent fuel dissolution hanging basket according to claim 1, characterized in that: The hanging ring (3) is placed in the installation groove (9) and the top end thereof extends out of the outer edge of the top plate (18).

6. The device for cleaning the surface residue of a spent fuel dissolution hanging basket according to claim 1, characterized in that: The cleaning ring tube (7) comprises a ring tube (15), a connecting tube (16) and a quick connector (17); the ring tube (15) is installed in the tube groove (10); the ring tube (15) and the connecting tube (16) are welded; the other end of the connecting tube (16) is welded to a socket of the quick connector (17); and the inner upper and lower surfaces of the ring tube (15) are provided with staggered and evenly arranged circular holes.

7. The device for cleaning the surface residue of a spent fuel dissolution hanging basket according to claim 1, characterized in that: There are three locking devices (5) in total and they are not collinear.

8. The device for cleaning the surface residue of a spent fuel dissolution hanging basket according to claim 7, characterized in that: The scraper plate (4) is disassembled or fastened by placing the locking block (12) on the locking device (5) in a vertical state or a horizontal state.

9. The device for cleaning the surface residue of a spent fuel dissolution hanging basket according to claim 8, characterized in that: The scraper plate (4) is pressed and fixed by a pressing plate (6).

10. The device for cleaning residue on the surface of a spent fuel dissolution hanging basket according to claim 9, characterized in that: The scraper plate (4) is made of rubber.

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