Device for processing spent fuel assemblies

Abstract

The embodiments of the present application relate to the field of spent fuel processing devices, and more specifically, to a device for processing spent fuel assemblies, comprising: a power source, which is disposed outside a hot chamber; an actuator, which is disposed inside the hot chamber, the actuator being configured to be movable to process the spent fuel assemblies, the power source being configured to provide power for the movement of the actuator; a drive shaft, which is configured to penetrate a hot chamber wall, the drive shaft being connected between the power source and the actuator; a support member, which is disposed inside the hot chamber wall, the drive shaft being movably disposed inside the support member, the support member being used to support the drive shaft for movement in an axial direction; and a sealing assembly, which is connected between the drive shaft and the hot chamber wall, the sealing assembly being located on both the inside and outside of the hot chamber wall and used to seal the hot chamber. In the embodiments of the present application, sealing assemblies are disposed on both the inside and outside of the hot chamber wall, and the sealing assemblies on both sides ensure the sealing of the hot chamber and enhance the sealing effect.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of spent fuel processing devices, and in particular to a device for processing spent fuel assemblies. Background Art

[0002] Currently, when processing spent fuel assemblies, the equipment handling them is often exposed to the highly radioactive dilute nitric acid atmosphere within a hot chamber. This environment can easily damage the equipment's power source. To prevent this damage, the power source can be placed outside the hot chamber and the power generated by it can be transmitted to the hot chamber to drive the actuators in the equipment handling the spent fuel assemblies. Summary of the Invention

[0003] The present application proposes a device for processing spent fuel assemblies.

[0004] An embodiment of the present application provides a device for processing spent fuel assemblies, which includes: a power source, which is arranged outside the hot chamber; an actuator, which is arranged inside the hot chamber, the actuator is configured to be movable to process the spent fuel assembly, and the power source is configured to provide power for the movement of the actuator; a transmission shaft, which is configured to penetrate the wall of the hot chamber, and the transmission shaft is connected between the power source and the actuator; a support member, which is arranged inside the hot chamber wall, the transmission shaft is movably inserted into the support member, and the support member is used to support the transmission shaft to move in an axial direction; a sealing assembly, which is connected between the transmission shaft and the hot chamber wall, and the sealing assembly is located on the inner and outer sides of the hot chamber wall and is used to seal the hot chamber.

[0005] In the embodiments of the present application, support members are utilized to support the movement of the drive shaft within the heat chamber wall, ensuring the effectiveness of the drive shaft, which penetrates the heat chamber wall, in introducing external power into the heat chamber. Furthermore, in this embodiment, sealing assemblies are provided on both the inside and outside of the heat chamber wall. These sealing assemblies on both sides ensure the sealing of the heat chamber and enhance the sealing effect. Furthermore, in the embodiments of the present application, the support members and sealing assemblies are arranged separately, allowing them to independently support and seal the drive shaft, facilitating replacement and maintenance of each structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 1 is a schematic structural diagram of an apparatus for processing spent fuel assemblies according to an embodiment of the present application;

[0007] Figure 2 for Figure 1 A local enlarged schematic diagram of area A in FIG;

[0008] Figure 3 for Figure 1 A local enlarged schematic diagram of the E region in FIG;

[0009] Figure 4 is a schematic structural diagram of a transmission shaft according to an embodiment of the present application;

[0010] Figure 5 for Figure 1 A local enlarged schematic diagram of area B in FIG;

[0011] Figure 6 for Figure 1 A local enlarged schematic diagram of the C region in FIG;

[0012] Figure 7 for Figure 6 A local enlarged schematic diagram of the D area in FIG.

[0013] Description of reference numerals:

[0014] 1. Device; 10. Power source; 20. Transmission shaft; 21. Drive connection section; 210. Limiting portion; 22. Support section; 23. Transmission connection section; 230. Connecting pin hole; 30. Support member; 40. Sealing assembly; 41. Inner sealing assembly; 411. Sealing connector; 4111. Dustproof mounting groove; 4112. First mounting groove; 4113. Second mounting groove; 4114. Fixing portion; 41140. Through hole; 412. Self-lubricating seal; 413. Dustproof gasket; 414. First sealing gasket; 415. Second sealing gasket; 42. Outer sealing assembly; 421. Second dustproof gasket; 422. Third sealing gasket; 50. Shielding body; 51. Connecting hole; 510. Limiting protrusion; 52. Inflatable sealing chamber; 53. Inflatable flow channel; 54. Channel; 60. Coupling;

[0015] 200. Hot chamber wall.

[0016] It should also be noted that the drawings are only for the purpose of illustrating the preferred embodiments, not the application itself. The drawings do not illustrate every aspect of the described embodiments and do not limit the scope of the application. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of this application. Obviously, the described embodiment is only one embodiment of this application, not all embodiments. Based on the described embodiments of this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. If the full text involves descriptions such as "first" and "second", the "first" and "second" descriptions are only used to distinguish similar objects, and cannot be understood as indicating or implying their relative importance, order of precedence, or implicitly indicating the number of technical features indicated. It should be understood that the data described by "first" and "second" can be interchangeable under appropriate circumstances. If "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes Solution A, Solution B, or solutions that meet both A and B.

[0019] The inventors of the present application have discovered that in existing devices for processing spent fuel assemblies in which the power source is placed outside the hot chamber, the power shaft needs to penetrate the boundary of the radioactive environment, resulting in poor sealing of the radioactive environment. This allows radiation inside the hot chamber to easily leak out of the hot chamber through gaps between the device and the hot chamber wall, polluting the environment outside the hot chamber, endangering the health of operators, and damaging equipment and instruments. In addition, it is difficult to ensure the effectiveness of the power shaft penetrating the boundary of the radioactive environment to introduce power into the radioactive environment.

[0020] To this end, the implementation of this application provides a device for processing spent fuel assemblies, Figure 1 Schematic diagram of the structure of an apparatus for processing spent fuel assemblies according to an embodiment of the present application.

[0021] like Figure 1 As shown, the apparatus 1 for processing spent fuel assemblies comprises: a power source 10, an actuator (not shown), a transmission shaft 20, a support member 30, and a sealing assembly 40. The power source 10 is disposed outside the hot chamber; the actuator is disposed inside the hot chamber and is configured to be movable to process the spent fuel assembly, with the power source 10 configured to provide power for the actuator's movement; the transmission shaft 20 is configured to penetrate the hot chamber wall 200 and is connected between the power source 10 and the actuator; the support member 30 is disposed within the hot chamber wall 200 and is movably disposed therein, supporting the transmission shaft 20 for axial movement; and the sealing assembly 40 is connected between the transmission shaft 20 and the hot chamber wall 200. The sealing assembly 40 is located on both the inner and outer sides of the hot chamber wall 200 and is configured to seal the hot chamber.

[0022] In an embodiment of the present application, a device 1 for processing spent fuel assemblies is provided. A drive shaft extends through the wall of a hot chamber, connecting a power source outside the hot chamber to an actuator within the hot chamber. This allows power from outside the hot chamber to be introduced into the hot chamber, powering the actuator's reciprocating motion. Furthermore, in this embodiment, a support member is used to support the drive shaft's movement within the hot chamber wall, ensuring the effectiveness of the drive shaft's introduction of external power into the hot chamber. A sealing assembly 40 is provided between the drive shaft 20 and the hot chamber wall 200 to prevent radiation from escaping from the hot chamber through the gap between the hot chamber wall 200 and the drive shaft 20, potentially contaminating the environment outside the hot chamber. Seal assemblies are also provided on both the inside and outside of the hot chamber wall. These seals ensure the airtightness of the hot chamber and enhance the sealing effect. Furthermore, in this embodiment, the support member and the sealing assembly are arranged separately, allowing them to independently support and seal the drive shaft, facilitating replacement and maintenance of each structure.

[0023] In some embodiments, the apparatus 1 provided herein is used for post-processing spent fuel assemblies, for example, for shearing spent fuel assemblies. In some embodiments, the actuator can be a shear blade configured to move in a straight line to shear the spent fuel assembly. In some embodiments, the power source 10 can be a hydraulic cylinder that uses hydraulic drive to power the actuator's reciprocating motion.

[0024] like Figure 2 As shown, in some embodiments, the transmission shaft 20 is divided into multiple sections, namely: a drive connection section 21, a support section 22, and a transmission connection section 23. The drive connection section 21 is located outside the hot chamber wall 200 and is connected to the power source 10; the support section 22 matches the size of the support member 30 and is movably disposed within the support member 30. The support section 22 is connected between the drive connection section 21 and the transmission connection section 23, and the transmission connection section 23 is connected to the actuator.

[0025] In this embodiment, the drive shaft 20 is divided into a functionally defined drive connection section 21, a support section 22, and a transmission connection section 23. The drive connection section 21 serves as the power input for the drive shaft 20, the support section 22 provides support for the reciprocating motion of the drive shaft, and the transmission connection section 23, a structure that penetrates the heat chamber wall and enters the heat chamber, is used to connect to the actuator and provide power to the actuator. In some embodiments, the drive shaft 20 can be integrally formed, that is, the drive connection section 21, support section 22, and transmission connection section 23 are integrally formed to ensure the structural stability of the drive shaft 20, resulting in high structural strength and improved power transmission.

[0026] In some embodiments, as Figure 3As shown, a coupling 60 is further connected between the drive connection section 21 and the power source 10. The coupling 60 can compensate for the offset between the output shaft of the power source 10 and the transmission shaft 20 to achieve a tight connection between the transmission shaft 20 and the power source 10. Optionally, a limiting portion 210 is formed at the end of the drive connection section 21, and a limiting groove is formed in the coupling 60. The limiting portion 210 matches the limiting groove and is connected to the limiting groove, thereby achieving a tight connection between the drive connection section 21 and the coupling 60. In some embodiments, the limiting groove is T-shaped, and the limiting portion 210 matches the limiting groove to prevent axial displacement between the coupling 60 and the drive connection section 21.

[0027] In some embodiments, the support member 30 may be a copper support sleeve, which has high structural strength, thereby providing stable support for the transmission shaft 20. The diameter of the copper support sleeve matches the size of the support section 22, so that the support section 22 can reciprocate within the copper support sleeve.

[0028] In some embodiments, a connecting pin hole 230 is opened at one end of the transmission connecting section 23 away from the hot chamber wall 200, and the transmission connecting section 23 and the actuator are connected through the connecting pin hole 230 to ensure a stable connection between the transmission connecting section 23 and the actuator.

[0029] In some embodiments, as Figures 1 to 2 As shown, a shielding body 50 is provided in the heat chamber wall 200. The shielding body 50 is formed with a connection hole 51. The connection hole 51 connects the interior and exterior of the heat chamber, providing space for the installation of the drive shaft 20. A support member 30 is disposed within the connection hole 51. The inner diameter of the support member 30 matches the inner diameter of the connection hole 51. The drive shaft 20 is movably disposed within the support member 30 and the connection hole 51. The provision of the shielding body 50 in this embodiment further prevents radiation from escaping from the heat chamber through the gap between the drive shaft 20 and the heat chamber wall 200.

[0030] In some embodiments, a groove is formed on the inner surface of the connecting hole 51, and the groove matches the support member 30. The support member 30 is embedded in the groove so that the inner diameter of the support member 30 is consistent with that of the connecting hole 51, thereby facilitating the movement of the support section 22 of the transmission shaft 20 in the support member and the connecting hole 51, ensuring smooth movement.

[0031] In some embodiments, as Figures 4 and 5As shown, the diameter of the transmission connection section 23 is smaller than that of the support section 22. A gas-filled sealed cavity 52 is formed between the transmission connection section 23 and the shielding body 50. Specifically, the gas-filled sealed cavity 52 is formed between the outer surface of the transmission connection section 23 and the inner surface of the connection hole 51. The gas-filled sealed cavity 52 is located between the support member 30 and the sealing assembly 40 on the inner side of the heat chamber wall 200. In this embodiment, the provision of the gas-filled sealed cavity 52 prevents gas from escaping from the heat chamber through the gap between the transmission connection section 23 and the shielding body 50, further enhancing the sealing effect between the transmission shaft 20 and the heat chamber wall 200.

[0032] In order to form an airtight sealing cavity 52 between the transmission connection section 23 and the shielding body 50 , a larger gap is required between the transmission connection section 23 and the shielding body 50 . Therefore, the diameter of the transmission connection section 23 is smaller than that of the support section 22 .

[0033] In some embodiments, a shoulder transition is formed between the support section 22 and the transmission connection section 23, allowing the larger diameter of the support section 22 to transition to the smaller diameter of the transmission connection section 23. In some embodiments, the diameter of the transmission connection section 23 can be 170 mm. When the transmission connection section 23 has a diameter of 170 mm, it can transmit a maximum hydraulic driving force of 60 tons and pass a 10,000-cycle load test.

[0034] In some embodiments, an inflation flow channel 53 is formed in the shielding body 50, one end of the inflation flow channel 53 is connected to the inflation sealed cavity 52, and the other end is connected to the outside of the heat chamber. The inflation flow channel 53 is used to provide a flow channel for gas to enter the inflation sealed cavity 52, so as to inflate the inflation sealed cavity 52, maintain positive pressure in the inflation sealed cavity 52, prevent gas in the heat chamber from entering, and improve the sealing effect.

[0035] In some embodiments, the inflation channel 53 can be connected to an external gas source to inflate the inflatable sealing cavity 52. ​​Furthermore, the amount of gas filled into the inflatable sealing cavity 52 can be controlled to maintain a positive pressure in the inflatable sealing cavity 52 to ensure a sealing effect.

[0036] In this embodiment, the inflation sealing cavity 52 is an annular groove structure formed between the shielding body 50 and the transmission connection section 23. After the gas transported by the external gas source is filled into the annular groove structure through the inflation flow channel 53, a positive pressure gas sealing area is formed in the annular groove structure to achieve inflation sealing.

[0037] In some embodiments, as Figure 1 、 Figure 2 and Figure 6As shown, the sealing assembly 40 includes an inner sealing assembly 41 and an outer sealing assembly 42. The inner sealing assembly 41 is connected to the end of the connection hole 51 facing the inner side of the heat chamber wall 200 and is used to seal the connection hole 51; the outer sealing assembly 42 is connected to the end of the connection hole 51 facing the outer side of the heat chamber wall 200 and is used to seal the connection hole 51.

[0038] This embodiment, by installing sealing assemblies 40 on both the inside and outside of the hot chamber, improves sealing effectiveness while also facilitating maintenance and handling of the sealing assemblies 40 on both sides. For example, since strong radiation within the hot chamber makes maintenance difficult, the inner sealing assembly 41 can be replaced during its lifespan, eliminating the need for maintenance. Since there is no radioactive radiation outside the hot chamber, the outer sealing assembly 42 can utilize repairable components, allowing maintenance outside the hot chamber.

[0039] In some embodiments, the outer sealing assembly 42 is connected between the supporting section 22 and the shielding body 50 ; and the inner sealing assembly 41 is connected between the transmission connection section 23 and the shielding body 50 .

[0040] In some embodiments, as Figure 1 、 Figure 6 and Figure 7 As shown, the inner sealing assembly 41 includes: a sealing connector 411 and a self-lubricating seal 412. The sealing connector 411 is sealingly sleeved on the outside of the transmission shaft 20, partially inserted into the connection hole 51, and the sealing connector 411 is detachably connected to the shielding body 50; the self-lubricating seal 412 is provided at one end of the sealing connector 411 located in the connection hole 51, and the transmission shaft 20 is movably passed through the self-lubricating seal 412. The self-lubricating seal 412 is used to seal and lubricate when the transmission shaft 20 moves. In this embodiment, the self-lubricating seal 412 is provided to improve the lubrication effect of the transmission shaft 20, so that the transmission shaft 20 moves smoothly and without abnormal noise when making reciprocating movements.

[0041] In some embodiments, the self-lubricating seal 412 can be a self-lubricating packing seal ring, for example, a graphite seal ring, which has excellent self-lubricating properties and can maintain sealing performance under load changes and temperature changes. At the same time, its low leakage, high temperature resistance, electrochemical corrosion resistance, wear resistance, low stress relaxation, and low preload characteristics have good applicability for power shafts used in radioactive environments.

[0042] In some embodiments, the diameter of the transmission connection section 23 of the transmission shaft 20 is smaller than the diameter of the connection hole 51. The sealing connector 411 and the self-lubricating seal 412 are sealingly disposed between the connection hole 51 and the transmission connection section 23. A limiting protrusion 510 is formed on the inner surface of the connection hole 51, and the self-lubricating seal 412 is limited between the limiting protrusion 510 and the sealing connector 411. In this embodiment, both ends of the self-lubricating seal 412 abut between the limiting protrusion 510 and the sealing connector 411, so that one end of the self-lubricating seal 412 is tightly fitted with the sealing connector 411, thereby providing both sealing and lubricating functions.

[0043] In some embodiments, the limiting protrusion 510 is located between the inflatable sealing cavity 52 and the self-lubricating seal 412, thereby forming an inflatable sealing cavity 52 between the support member 30, the limiting protrusion 510, the inner surface of the connecting hole and the outer surface of the transmission connecting section 23, while achieving the limitation of the self-lubricating seal 412.

[0044] In some embodiments, a dustproof mounting groove 4111 is formed on the inner side of the sealing connector 411 toward the transmission shaft 20. The dustproof mounting groove 4111 is provided at one end of the sealing connector 411 outside the connection hole 51. The inner sealing assembly 41 further includes a dustproof gasket 413 installed in the dustproof mounting groove to prevent dust in the hot chamber from entering the connection hole 51. Specifically, when the transmission connection section 23 drives the actuator to reciprocate in the axial direction of the transmission shaft 20 to process the spent fuel assembly, relative motion occurs between the transmission connection section 23 and the shielding body 50. Dust in the hot chamber will be brought into the connection hole 51 by the transmission connection section 23. By providing the dustproof gasket 413, dust in the hot chamber can be prevented from entering the connection hole 51.

[0045] In some embodiments, the dustproof gasket 413 is located at the edge of the sealing connector 411 at one end of the sealing connector 411 outside the connection hole 51. The dustproof gasket 413 is partially located inside the sealing connector 411 and partially located outside the sealing connector 411 to prevent dust outside the sealing connector 411 from entering the gap between the sealing connector 411 and the transmission connection section 23. In some embodiments, the portion of the dustproof gasket 413 outside the sealing connector 411 is tapered, with the exposed side of the portion being inclined from the sealing connector 411 toward the transmission connection section 23.

[0046] In some embodiments, a first mounting groove 4112 is formed on the inner side of the sealing connector 411 facing the transmission shaft 20. The inner sealing assembly 41 further includes a first sealing gasket 414, which is installed in the first mounting groove 4112 and is used to seal the connection hole 51 to prevent radiation within the heat chamber from entering the connection hole 51 through the gap between the sealing connector 411 and the transmission connection section 23 and leaking out.

[0047] In some embodiments, first sealing gasket 414 is a Y-shaped sealing gasket. When the Y-shaped sealing gasket is positioned between two components, and one of the components is stationary while the other reciprocates, the Y-shaped sealing gasket can prevent radiation from entering the gap between the two components. In the present application, when transmission connection section 23 drives the actuator to reciprocate along the axial direction of transmission shaft 20 to process the spent fuel assembly, transmission connection section 23 reciprocates while sealing connection member 411 is stationary. Therefore, the Y-shaped sealing gasket disposed between transmission connection section 23 and sealing connection member 411 can prevent radiation within the hot chamber from entering connection hole 51 through the gap between sealing connection member 411 and transmission connection section 23 and leaking out.

[0048] In some embodiments, the sealing connector 411 is formed with a second mounting groove 4113 on the outside of the shielding body 50. The inner sealing assembly 41 further includes a second sealing gasket 415, which is mounted in the second mounting groove 4113. The first sealing gasket 414 is located between the second sealing gasket 415 and the dustproof gasket 413. The second sealing gasket 415 is used to seal the connecting hole 51 to prevent radiation from leaking through the gap between the shielding body 50 and the sealing connector 411.

[0049] In some embodiments, the second sealing gasket 415 is an O-shaped sealing gasket. The O-shaped sealing gasket and the Y-shaped sealing gasket cooperate to more effectively prevent the radiation in the hot chamber from leaking out.

[0050] In some embodiments, the first sealing ring 414 is arranged at the part of the sealing connector 411 outside the connecting hole, and the second sealing ring 415 is arranged at a position of the sealing connector 411 close to the self-lubricating seal 412. The dustproof gasket 413, the first sealing ring 414 and the second sealing ring 415 work together to improve the sealing effect.

[0051] In some embodiments, the sealing connector 411 can be detachably connected to the shielding body 50. The sealing connector 411 has a fixing portion 4114 formed on the outside away from the transmission connection section 23. When the sealing connector 411 is connected to the shielding body, the fixing portion 4114 is located outside the connection hole 51.

[0052] In some embodiments, the sealing connector 411 can be connected to the shield 50 using fasteners. Specifically, a through hole 41140 is formed in the fixing portion 4114 along the axial direction of the transmission shaft 20. A channel 54 having the same diameter as the through hole 41140 is formed on the side of the shield 50 facing the fixing portion 4114. The fastener is connected to the through hole 41140 and the channel 54, thereby achieving a detachable connection between the sealing connector 411 and the shield 50.

[0053] In some embodiments, the fastener may be a bolt. When the sealing connector 411 is to be mounted on the shield 50, the bolt may be inserted from the end of the fixing portion 4114 away from the shield 50 into the through hole 41140, passed through the through hole 41140 and into the channel 54, and the nut may be rotated to tighten the bolt, thereby securing the sealing connector 411 to the shield 50.

[0054] In some embodiments, there may be multiple fasteners, which are evenly arranged along the circumferential direction of the transmission shaft 20, thereby firmly connecting the sealing connector 411 to the shielding body 50 and ensuring the sealing between the transmission shaft 20 and the shielding body 50 in all directions.

[0055] In some embodiments, the fixing portion 4114 is spaced apart from a side of the shielding body 50 close to the fixing portion 4114 by a predetermined distance.

[0056] In some embodiments, as Figure 2 As shown, the outer sealing assembly 42 is closer to the outside of the heat chamber wall 200 than the support member 30 to prevent dust pollution outside the heat chamber wall 200 from damaging the support member 30 located in the connecting hole 51.

[0057] In some embodiments, the outer sealing assembly 42 includes a dustproof gasket 421. The dustproof gasket 421 is disposed between the support section 22 and the shield body 50 and at the edge of the end of the shield body 50 facing the outside of the heat chamber wall 200. The dustproof gasket 421 is partially disposed within the shield body 50 and partially disposed outside the shield body 50 to prevent dust outside the heat chamber wall 200 from entering the connecting hole 51. In some embodiments, the shield body 50 is formed with an annular groove, and the dustproof gasket 421 is disposed in the annular groove.

[0058] Specifically, when the drive shaft 20 reciprocates along its axial direction to drive the actuator, relative motion occurs between the support segment 22 and the shield 50. Dust outside the hot chamber is drawn into the connecting hole 51 by the support segment 22. The provision of the dustproof gasket 421 prevents dust outside the hot chamber from entering the connecting hole 51. In some embodiments, the portion of the dustproof gasket 421 located outside the shield 50 is tapered, with the exposed surface of the portion being inclined from the shield 50 toward the support segment 22.

[0059] In some embodiments, the outer sealing assembly 42 further includes a third sealing gasket 422, which is disposed between the support segment 22 and the shield body 50 and closer to the support member 30 than the second dustproof gasket 421. The third sealing gasket 422 is configured to seal the connection hole 51 to prevent radiation from leaking through the gap between the support segment 22 and the shield body 50. In some embodiments, the shield body 50 is formed with an annular mounting groove, and the dustproof gasket 421 is disposed within the annular mounting groove.

[0060] In this embodiment, the third sealing gasket 422 cooperates with the first sealing gasket 414 and the second sealing gasket 415 to more effectively prevent radiation within the heat chamber from leaking out through the gap between the shield 50 and the transmission shaft 20. In some embodiments, the third sealing gasket 422 can be an O-ring.

[0061] The apparatus 1 for processing spent fuel assemblies provided in the embodiment of the present application performs multi-stage sealing of the connection hole 51 by cooperating with the inflatable sealing chamber 52, the first sealing gasket 414, the second sealing gasket 415, and the third sealing gasket 422. The sealing effect is strong. The apparatus 1 provided in the embodiment of the present application was measured using a pressure change method, and it was found that the sealing level of the apparatus 1 can reach level 2.

[0062] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the scope of the present invention.

Claims

1. A device for processing spent fuel assemblies, characterized in that: include: A power source, the power source being arranged outside the hot room; an actuator, the actuator being disposed in the hot chamber, the actuator being configured to be movable to process the spent fuel assembly, the power source being configured to provide power for the movement of the actuator; A transmission shaft, the transmission shaft being arranged to penetrate the wall of the hot chamber and connected between the power source and the actuator; A support member, the support member is arranged in the wall of the hot chamber, the transmission shaft is movably arranged in the support member, and the support member is used to support the transmission shaft to move in the axial direction; A sealing assembly connected between the transmission shaft and the wall of the heat chamber, the sealing assembly being located on the inner and outer sides of the wall of the heat chamber and used for sealing the heat chamber; The transmission shaft is divided into multiple sections, including: a supporting section, the supporting section matching the size of the supporting member and being movably disposed in the supporting member; a transmission connecting section, the transmission connecting section being used to connect with the actuator; A shielding body is provided in the wall of the heat chamber, and the shielding body is formed with a connection hole; The support member is disposed in the connecting hole, the inner diameter of the support member is consistent with the inner diameter of the connecting hole, and the transmission shaft is movably disposed in the support member and the connecting hole; The diameter of the transmission connection section is smaller than the diameter of the support section, and an inflatable sealing cavity is formed between the transmission connection section and the shielding body, and the inflatable sealing cavity is located between the support member and the sealing component on the inner side of the hot chamber wall; An inflation flow channel is formed in the shielding body, one end of the inflation flow channel is communicated with the inflation sealed cavity, and the other end is communicated with the outside of the heat chamber, and the inflation flow channel is used to provide a flow channel for gas to enter the inflation sealed cavity.

2. The device according to claim 1, characterized in that The transmission shaft further comprises: a drive connection section, the drive connection section being located outside the wall of the hot chamber and connected to the power source; The supporting section is connected between the driving connecting section and the transmission connecting section.

3. The device according to claim 1 or 2, characterized in that The sealing assembly comprises: an inner sealing assembly connected to one end of the connection hole facing the inner side of the heat chamber wall, for sealing the connection hole; An outer sealing component is connected to one end of the connection hole facing the outer side of the hot chamber wall and is used for sealing the connection hole.

4. The device according to claim 3, characterized in that The inner sealing assembly comprises: a sealing connector, the sealing connector being sealingly sleeved on the outside of the transmission shaft, the sealing connector being partially inserted into the connecting hole, and the sealing connector being detachably connected to the shielding body; A self-lubricating seal is provided at one end of the sealing connector located in the connecting hole, and the transmission shaft is movably passed through the self-lubricating seal. The self-lubricating seal is used for sealing and lubricating when the transmission shaft moves.

5. The device according to claim 4, characterized in that The diameter of the transmission connection section of the transmission shaft is smaller than the diameter of the connection hole, and the sealing connection member and the self-lubricating seal are sealingly arranged between the connection hole and the transmission connection section; Wherein, a limiting protrusion is formed on the inner surface of the connecting hole, and the self-lubricating sealing component is limited between the limiting protrusion and the sealing connecting component.

6. The device according to claim 4, characterized in that The sealing connector is formed with a dustproof mounting groove on the inner side facing the transmission shaft, and the dustproof mounting groove is provided at one end of the sealing connector located outside the connecting hole; The inner sealing assembly further comprises: A dustproof gasket is installed in the dustproof installation groove and is used to prevent dust in the hot chamber from entering the connecting hole.

7. The device according to claim 4, characterized in that The sealing connection member is formed with a first mounting groove on the inner side facing the transmission shaft; The inner sealing assembly further comprises: A first sealing gasket is installed in the first installation groove and is used to seal the connecting hole.

8. The device according to claim 7, characterized in that The sealing connector is formed with a second mounting groove toward the outer side of the shielding body; The inner sealing assembly further comprises: A second sealing gasket is installed in the second installation groove, the first sealing gasket is located between the second sealing gasket and the dustproof gasket, and the second sealing gasket is used to seal the connecting hole.

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