Dual-purpose long-life container for spent fuel storage and transportation

Abstract

The application discloses a spent fuel storage and transportation dual-purpose long-service-life container, relates to the technical field of fuel storage and transportation, and comprises an outer cylinder and an inner cylinder, a neutron shielding layer and a gamma ray shielding filling layer are arranged on the outer cylinder, spent fuel is placed in the inner cylinder, an inner cylinder inner cover and an inner cylinder outer cover are arranged on the inner cylinder, an outer cylinder inner cover and an outer cylinder outer cover are arranged on the outer cylinder, and shock absorbers are arranged at both ends of the outer cylinder.The neutron shielding layer and the gamma ray shielding filling layer on the outer cylinder can shield radiation, so that the container does not need to be matched with an external concrete shielding module during storage, two shock absorbers are arranged on the outer cylinder, the container can realize transportation function, the two shock absorbers are removed, the container can realize storage function, meanwhile, the inner cylinder and the outer cylinder of the container are respectively provided with an inner cover and an outer cover, the sealing effect of the container is improved, the container can realize long-term storage, and the transportation and storage of spent fuel are considered.

Description

Technical Field

[0001] This application relates to the field of spent fuel storage and transportation technology, and in particular to a long-life container for both spent fuel storage and transportation. Background Technology

[0002] Fuel refers to nuclear fuel assemblies that have reached the design burn-up level in a nuclear reactor and have been removed from the reactor core. After being removed from the reactor, spent fuel is usually stored in the spent fuel pool of the nuclear power plant for a certain period of time. After its decay heat and radioactivity levels have significantly decreased, it is then transferred to an off-site storage facility for dry storage.

[0003] Currently, domestic spent fuel transport containers only have a single transport function, and these containers are sealed with rubber sealing rings. Under long-term storage conditions, these rubber sealing rings will age, posing a risk of leakage. After transport, the containers cannot be used directly for storage; the spent fuel must be transferred from the transport container to a sealed storage tank in a water pool, and then the sealed storage tank is placed inside a concrete shielding module to achieve storage. This process is cumbersome, carries the risk of radioactive material transfer during the transfer, and has low equipment utilization. Therefore, there is an urgent need for an integrated container that combines the dual functions of spent fuel storage and transport, with a sealing structure that meets the safety requirements for long-term storage. Summary of the Invention

[0004] To address the issue that spent fuel containers cannot simultaneously handle transportation and storage, this application provides a long-life container suitable for both spent fuel storage and transportation.

[0005] The technical solution for a dual-purpose, long-life container for spent fuel storage and transportation provided in this application is as follows: A dual-purpose, long-life container for spent fuel storage and transportation includes an outer cylinder and an inner cylinder, both open at one end. A neutron shielding layer is fixedly disposed on the outer side of the outer cylinder, and a gamma-ray shielding filling layer is disposed inside the outer cylinder. The inner cylinder is disposed inside the outer cylinder, and spent fuel is placed inside the inner cylinder. An inner inner cover and an outer inner cover are sequentially disposed from the inside to the outside at the open end of the inner cylinder, and an outer inner cover and an outer outer cover are sequentially disposed from the inside to the outside at the open end of the outer cylinder. Shock absorbers are detachably disposed at both ends of the outer cylinder along its length.

[0006] By adopting the above technical solution, the neutron shielding layer and gamma-ray shielding filling layer on the outer cylinder can shield radiation, so that the container does not need to be used with the external concrete shielding module during storage. The container can realize the transportation function by installing two shock absorbers on the outer cylinder, and the container can realize the storage function by removing the two shock absorbers. At the same time, the inner cylinder and the outer cylinder of the container are respectively installed with inner and outer covers, which improves the sealing effect of the container and enables the container to be stored for a long time, thus taking into account both the transportation and storage of spent fuel.

[0007] Preferably, the inner cylinder inner cover is welded to the opening end of the inner cylinder, the inner cylinder outer cover is welded to the opening end of the inner cylinder, the outer cylinder inner cover is detachably mounted to the opening end of the outer cylinder by bolts, and the outer cylinder outer cover is detachably fixed to the opening end of the outer cylinder by bolts.

[0008] By adopting the above technical solution, the inner cover and outer cover of the inner cylinder are fixed to the inner cylinder by welding, which makes the inner cylinder more airtight. The inner cover and outer cover of the outer cylinder are detachably fixed to the outer cylinder by screwing, which makes it easier to disassemble the inner cover and outer cover of the outer cylinder, making it more convenient to inspect the inside of the container.

[0009] Preferably, the inner cover of the outer cylinder is provided with two first metal sealing rings spaced radially on the side wall near the outer cylinder, and the outer cover of the outer cylinder is provided with a second metal sealing ring on the side wall near the inner cover of the outer cylinder.

[0010] By adopting the above technical solution, the outer cylinder is sealed with three metal sealing rings, eliminating the need for rubber sealing rings and thus solving the problem of sealing rings aging easily during long-term storage.

[0011] Preferably, the inner cylinder is provided with multiple storage sleeves at intervals, and the spent fuel is placed in the storage sleeves. The inner cylinder is provided with multiple support plates at intervals along its own axis, and each storage sleeve is provided with multiple support plates.

[0012] By adopting the above technical solution, when storing spent fuel, multiple spent fuels are placed in multiple storage sleeves. The storage sleeves limit the movement of the spent fuels, making them less prone to shaking during transportation. At the same time, multiple support plates limit the movement of the storage sleeves, making them more stable during transportation.

[0013] Preferably, multiple heat-conducting plates are spaced apart along their own axial direction inside the inner cylinder, and each storage sleeve is provided with multiple heat-conducting plates. The inner and outer sides of the heat-conducting plates abut against the outer wall of the storage sleeve and the inner wall of the inner cylinder, respectively.

[0014] By adopting the above technical solution, the heat-conducting plate forms a solid heat conduction path, and the heat of the storage sleeve can be transferred to the inner cylinder through the heat-conducting plate, so that the heat of spent fuel decay can be quickly discharged.

[0015] Preferably, the inner cylinder is filled with a heat-conducting medium.

[0016] By adopting the above technical solution, the heat transfer medium increases the heat transfer efficiency inside the inner cylinder, further enabling the rapid removal of heat from spent fuel decay.

[0017] Preferably, the inner cylinder body cover is provided with an air inlet channel and an air outlet channel, and quick connectors are provided in both the air inlet channel and the air outlet channel of the inner cylinder body.

[0018] By adopting the above technical solution, after the inner cylinder cover is welded and fixed, the air inlet pipe is connected to the air inlet channel, and the air outlet pipe is connected to the air outlet channel. The air inlet pipe injects heat-conducting medium into the inner cylinder, and the cooling water stored in the inner cylinder is discharged from the air outlet pipe through the air outlet channel, thereby filling the inner cylinder with heat-conducting medium.

[0019] Preferably, a limiting strip is fixedly provided on the inner side wall of the inner cylinder, and a limiting groove is formed on the outer side wall of the support plate. The limiting strip is inserted into the limiting groove. A marking line is formed on the outer side wall of the neutron shielding layer. The marking line and the limiting strip are on the same straight line along the radial direction of the outer cylinder. A limiting component is provided between every two adjacent storage sleeves. The limiting component is used to abut and limit the spent fuel in the storage sleeve along the direction perpendicular to the line connecting the limiting strip and the marking line.

[0020] By adopting the above technical solution, after the support plate is installed into the inner cylinder, the limiting strip is inserted into the limiting groove of the support plate, so that the storage sleeve will not rotate in the inner cylinder. When transporting spent fuel, the container is placed horizontally so that the marking line is located at the top of the outer cylinder. At this time, the limiting component abuts and limits the spent fuel in the storage sleeve in the horizontal direction, reducing the swaying of spent fuel during transportation.

[0021] Preferably, the limiting assembly includes a trigger rod, a first elastic element, a locking block, a second elastic element, a third elastic element, and a limiting block. The limiting block is slidably disposed within the side wall of the storage sleeve. The two ends of the first elastic element are respectively connected to the limiting blocks in two adjacent storage sleeves and pull the two limiting blocks toward each other. The trigger rod slidably passes through multiple support plates and is located between two adjacent limiting blocks. The second elastic element is disposed at the bottom of the inner cavity of the outer cylinder and is used to push the top end of the trigger rod out of the opening end of the inner cylinder. The end of the trigger rod abuts against the inner cylinder. Inner cover; the locking block is slidably mounted on the trigger rod, the end of the locking block is set with a pointed corner and moves to contact two limiting blocks, the third elastic element is mounted on the trigger rod and abuts against the locking block, the side wall of the limiting block near the trigger rod is inclined towards the trigger rod, the inclined wall of the limiting block is provided with a first anti-reverse rack, and the bottom end of the locking block is provided with a second anti-reverse rack on both opposite side walls. When the locking block moves towards the bottom of the inner cylinder, the second anti-reverse rack moves past the first anti-reverse rack. When the limiting block moves away from the spent fuel, the first anti-reverse rack locks with the second anti-reverse rack.

[0022] By adopting the above technical solution, when spent fuel is put into the storage sleeve, the first elastic element pulls the limiting block to move towards the outside of the storage sleeve, so that the limiting block will not affect the entry of spent fuel into the storage sleeve. After all the fuel is put in, the inner cylinder inner cover is installed on the inner cylinder. The inner cylinder inner cover pushes the trigger rod to move downward. The trigger rod drives the locking block to move downward. During the downward movement of the locking block, the second anti-reverse rack on the locking block moves past the first anti-reverse rack of the limiting block and pushes the limiting block to move towards the spent fuel. When the limiting block moves to abut against the spent fuel, the first anti-reverse rack and the second anti-reverse rack form a lock, thereby enabling the spent fuel to abut and be limited.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The outer cylinder is equipped with a neutron shielding layer and a gamma-ray shielding filling layer to shield radiation, so that the container does not need to be used with an external concrete shielding module during storage. The container can be transported by installing two shock absorbers on the outer cylinder, and can be stored by removing the two shock absorbers. At the same time, the inner and outer cylinders of the container are equipped with two covers, one inside and one outside, which improves the sealing effect of the container and enables long-term storage, thus taking into account both the transportation and storage of spent fuel. 2. The outer cylinder is sealed with three metal sealing rings, eliminating the need for rubber sealing rings and thus solving the problem of sealing rings aging during long-term storage; 3. Through the heat-conducting plate and the heat-conducting medium, the heat-conducting plate forms a solid heat conduction path, and the heat-conducting medium increases the heat conduction efficiency inside the inner cylinder, so that the heat of the storage sleeve can be transferred to the inner cylinder through the heat-conducting plate, which facilitates the rapid removal of heat from spent fuel decay. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the overall structure of a long-life container for both storage and transportation of spent fuel according to Embodiment 1 of this application; Figure 2 This is a partial structural cross-sectional view of a dual-purpose, long-life container for the storage and transportation of spent fuel according to Embodiment 1 of this application, to highlight the inner cylinder; Figure 3 This is a partial structural cross-sectional view of a dual-purpose, long-life container for the storage and transportation of spent fuel according to Embodiment 1 of this application, with the outer cylinder shown in detail. Figure 4 For this application Figure 3 Enlarged view of point A in the middle; Figure 5 This is a cross-sectional view of the overall structure of a dual-purpose long-life container for the storage and transportation of spent fuel according to Embodiment 2 of this application, with the marked lines highlighted. Figure 6This is a cross-sectional view of the overall structure of a dual-purpose long-life container for the storage and transportation of spent fuel according to Embodiment 2 of this application, with the limiting groove highlighted. Figure 7 This is a partial structural cross-sectional view of a dual-purpose, long-life container for the storage and transportation of spent fuel according to Embodiment 2 of this application, to highlight the inner cylinder; Figure 8 This is a schematic diagram of the overall structure of a dual-purpose long-life container for the storage and transportation of spent fuel according to Embodiment 2 of this application, to highlight the limiting components; Figure 9 This is a cross-sectional view of the overall structure of a dual-purpose long-life container for the storage and transportation of spent fuel according to Embodiment 2 of this application, to highlight the limiting components; Figure 10 For this application Figure 9 Enlarged diagram of point B in the middle.

[0025] Reference numerals: 1. Outer cylinder; 2. Inner cylinder; 3. Neutron shielding layer; 4. Gamma-ray shielding filling layer; 5. Spent fuel; 6. Inner cylinder inner cover; 7. Inner cylinder outer cover; 8. Outer cylinder inner cover; 9. Outer cylinder outer cover; 10. Shock absorber; 11. First metal sealing ring; 12. Second metal sealing ring; 13. Storage sleeve; 14. Support plate; 15. Heat-conducting plate; 16. Air inlet channel; 17. Air outlet channel; 18. Limiting strip; 19. Limiting groove; 20. Marking line; 21. Limiting assembly; 211. Trigger rod; 212. First elastic element; 213. Locking block; 214. Second elastic element; 215. Third elastic element; 216. Limiting block; 22. First anti-reverse rack; 23. Second anti-reverse rack; 24. First push plate; 25. Second push plate; 26. Translation block; 27. Translation groove. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-10 This application will be described in further detail.

[0027] This application discloses a long-life container for both storage and transportation of spent fuel.

[0028] Example 1: Reference Figure 1 A dual-purpose, long-life container for spent fuel storage and transportation includes an outer cylinder 1 and an inner cylinder 2. One end of the outer cylinder 1 and the inner cylinder 2 is positioned away from the opening along their axial direction, and the inner cylinder 2 is installed inside the outer cylinder 1. Both ends of the outer cylinder 1 along its length are detachably fixed with shock absorbers 10 by bolts.

[0029] Reference Figure 2The inner cylinder 2 has a storage chamber inside. Storage sleeves 13 are installed along the axial direction of the inner cylinder 2 within the storage chamber, with twenty-four storage sleeves 13 spaced apart within the inner cylinder 2. Multiple support plates 14 are spaced apart along the axial direction within the inner cylinder 2, and each storage sleeve 13 is permeated by multiple support plates 14, with the storage sleeve 13 fixedly connected to the support plates 14. Spent fuel 5 is stored within the storage sleeves 13 of the inner cylinder 2, and the multiple support plates 14 support the storage sleeves 13, ensuring the spent fuel 5 remains stable within the inner cylinder 2.

[0030] The inner cylinder 2 has an inner inner cover 6 and an outer inner cover 7 fixedly installed at its open end by a full penetration weld. The outer inner cover 7 is located outside the inner inner cover 6. The open end of the inner cylinder 2 adopts a metal welded sealing structure without rubber seals, thus forming a first-level permanent containment boundary to prevent leakage during long-term storage.

[0031] Two heat-conducting plates 15 are installed at intervals between every two adjacent support plates 14 in the inner cylinder 2. In this application, the heat-conducting plates 15 are aluminum plates. Multiple heat-conducting plates 15 pass through each storage sleeve 13, and the inner side of the heat-conducting plate 15 abuts against the outer wall of the storage sleeve 13, and the outer side abuts against the inner wall of the inner cylinder 2. The inner cover 6 of the inner cylinder has an air inlet channel 16 and an air outlet channel 17, and quick connectors are installed in both the air inlet channel 16 and the air outlet channel 17.

[0032] After the inner cylinder cover 6 is welded and fixed, the inlet pipe is connected to the inlet channel 16, and the outlet pipe is connected to the outlet channel 17. The inner cylinder 2 is filled with a heat-conducting medium (helium) through the inlet pipe, while the existing cooling water inside the inner cylinder 2 is discharged through the outlet channel 17 and the outlet pipe, thus achieving complete filling of the heat-conducting medium. The heat-conducting plate 15 forms a solid heat conduction path, while the heat-conducting medium forms a gaseous heat conduction path. Together, they construct a heat transfer channel, facilitating the efficient transfer of heat generated by spent fuel 5 to the inner cylinder 2, thereby ensuring the rapid removal of decay heat from spent fuel 5.

[0033] Reference Figure 3 and Figure 4 The outer cylinder 1 has an inner cover 8 and an outer cover 9 that are detachably fixed to its open end by bolts. The outer cover 9 is located outside the inner cover 8. Two first metal sealing rings 11 are installed at intervals on the side wall of the inner cover 8 near the outer cover 7, and a second metal sealing ring 12 is installed on the side wall of the outer cover 9 near the inner cover 8. Both the first metal sealing rings 11 and the second metal sealing ring 12 abut against the outer cylinder 1. The two first metal sealing rings 11 and the one second metal sealing ring 12 constitute a triple redundant independent sealing cavity, which can withstand the design pressure with a single channel, significantly improving the sealing reliability of the container.

[0034] The intermediate cavity of the outer cylinder 1 is filled with a high-density material to form a gamma-ray shielding filling layer 4. In this application, the gamma-ray shielding filling layer 4 can be composed of high-density materials such as cast iron, heavy concrete, lead alloy, and tungsten-based composite materials. A neutron shielding layer 3 is fixedly installed on the outer side wall of the outer cylinder 1, covering the outer cylindrical surface and upper and lower end faces of the outer cylinder 1. In this application, the neutron shielding layer 3 can be composed of boron-containing polyethylene, boron resin, and lithium-based composite materials. By using the neutron shielding layer 3 and the gamma-ray shielding filling layer 4 for radiation shielding, the container does not require an external concrete module and can be directly used for storage and transportation.

[0035] An air inlet channel 16 and an air outlet channel 17 are also provided on the inner cover 8 of the outer cylinder. Similarly, after the inner cover 8 of the outer cylinder is fixedly installed, the heat transfer medium is filled into the outer cylinder 1 and the cooling water in the outer cylinder 1 is discharged.

[0036] The implementation principle of a dual-purpose, long-life container for spent fuel storage and transportation according to this application embodiment is as follows: The container has a neutron shielding layer 3 and a gamma-ray shielding filling layer 4 on its outer cylinder 1, which can achieve radiation shielding, thus allowing it to be used independently without relying on an external concrete shielding module in the storage state. By installing two shock absorbers 10 on the outer cylinder 1, the container can meet the transportation function; after removing the shock absorbers 10, the container is converted to the storage state. In addition, the inner cylinder 2 and the outer cylinder 1 are independently equipped with a cover, forming a double sealing structure, which significantly improves the long-term sealing performance of the container, enabling it to meet the long-term storage requirements of spent fuel 5. Thus, the container has both transportation and storage functions for spent fuel 5, and there is no need to transfer containers during the conversion between transportation and storage, resulting in higher equipment utilization.

[0037] Example 2: Reference Figure 5 and Figure 6 The difference between this embodiment and Embodiment 1 is that a limiting strip 18 is fixedly installed on the inner sidewall of the inner cylinder 2 along its own axis, and a limiting groove 19 is formed on each support plate 14 and heat-conducting plate 15, with the limiting strip 18 inserted into the limiting groove 19 of the support plate 14 and heat-conducting plate 15. A marking line 20 is engraved on the outer sidewall of the neutron shielding layer 3 along its own axis, and the marking line 20 and the limiting strip 18 are on the same straight line along the radial direction of the outer cylinder 1.

[0038] After the support plate 14 is installed into the inner cylinder 2, the limiting strip 18 forms an insertion fit with the limiting groove 19 on the support plate 14 and the heat-conducting plate 15, thereby restricting the circumferential rotation of the storage sleeve 13 within the inner cylinder 2. During the transportation of spent fuel 5, the container is arranged horizontally with the marking line 20 located at the top of the outer cylinder 1.

[0039] Reference Figure 6 and Figure 7Multiple limiting components 21 are installed in the inner cylinder 2, with each limiting component 21 located between two adjacent storage sleeves 13. When the container is arranged horizontally and the marking line 20 is located at the top of the outer cylinder 1, one limiting component 21 can align and limit the two spent fuels 5 on both sides, so that the spent fuels 5 will not shake inside the storage sleeve 13 during transportation.

[0040] Reference Figure 7 , Figure 8 , Figure 9 and Figure 10 Specifically, the limiting component 21 includes a trigger rod 211, a first elastic element 212, a locking block 213, a second elastic element 214, a third elastic element 215, and a limiting block 216. The trigger rod 211 is located between the two storage sleeves 13 and is slidably installed in the inner cylinder 2 along its length, passing through the support plate 14 and the heat-conducting plate 15. The second elastic element 214 is installed at the bottom of the storage cavity of the inner cylinder 2. A second push plate 25 is fixedly installed at one end of the trigger rod 211 near the bottom of the inner cylinder 2. The trigger rod 211 is inserted into the second elastic element 214, and the end of the second elastic element 214 abuts against the second push plate 25. In this application, the second elastic element 214 can be a spring.

[0041] The second elastic element 214 drives the trigger rod 211 to move via the second push plate 25, causing the end of the trigger rod 211 away from the second elastic element 214 to extend out of the opening end of the inner cylinder 2. When the inner cover 6 is installed on the inner cylinder 2, the inner cover 6 will push the trigger rod 211 to move inward toward the inner cylinder 2.

[0042] Four limiting blocks 216 are slidably installed inside the side wall of the storage sleeve 13. Each limiting block 216 is located at the ends of the adjacent side walls of two adjacent storage sleeves 13, and the line connecting any two adjacent limiting blocks 216 is perpendicular to the line connecting the marking line 20 and the limiting strip 18. Four first elastic elements 212 are installed, with each pair of first elastic elements 212 fixedly connected at both ends to two adjacent limiting blocks 216, and the two first elastic elements 212 are located on both sides of the trigger rod 211. In this application, the first elastic element 212 can be a tension spring.

[0043] During the process of loading spent fuel 5 into the storage sleeve 13, the first elastic element 212 pulls the limiting block 216 to move outward from the storage sleeve 13, and an annular step is formed on the periphery of the end of the limiting block 216 away from the trigger rod 211. When the first elastic element 212 pulls the limiting block 216 to move, the annular step is just embedded in the inner wall of the storage sleeve 13, thereby avoiding interference of the limiting block 216 with the entry of spent fuel 5.

[0044] Both ends of the trigger rod 211 are fixedly mounted with first push plates 24, and two third elastic elements 215 are installed, which are sleeved on the trigger rod 211. The two third elastic elements 215 are respectively located on the side of the two first push plates 24 away from the opening end of the inner cylinder 2. In this application, the third elastic element 215 can be selected as a spring.

[0045] Locking blocks 213 are slidably mounted on the trigger rod 211 along its length. Two locking blocks 213 are slidably mounted, and each block is fixedly connected to the ends of two third elastic members 215 away from the first push plate 24. In this application, the third elastic members 215 may be springs.

[0046] The limiting block 216 is inclined near the side wall of the trigger rod 211. The inclined wall of the limiting block 216 gradually slopes towards the trigger rod 211 from the opening end of the inner cylinder 2 toward the bottom end of the inner cylinder 2. A first anti-reverse rack 22 is fixedly installed on the inclined wall of the limiting block 216. The locking block 213 is set with a pointed corner near the bottom of the inner cylinder 2 and is trapezoidal. A second anti-reverse rack 23 is fixedly installed on both inclined walls of the locking block 213. The second anti-reverse rack 23 of the locking block 213 moves to contact the first anti-reverse rack 22 of the limiting block 216.

[0047] Multiple translation blocks 26 are fixedly installed at intervals on the trigger rod 211, and the translation blocks 26 are T-shaped. Multiple translation slots 27 are provided at intervals on both the support plate 14 and the heat conduction plate 15. The trigger rod 211 is slidably installed in the multiple translation slots 27, and the multiple translation blocks 26 are slidably installed in the multiple translation slots 27 of the support plate 14.

[0048] The implementation principle of Embodiment 2 of this application is as follows: During the process of loading spent fuel 5 into the storage sleeve 13, the first elastic element 212 drives the limiting block 216 to move outward from the storage sleeve 13, so that the limiting block 216 avoids the loading path of spent fuel 5 and avoids interference. After the spent fuel 5 is completely in place, the inner cylinder inner cover 6 is installed on the inner cylinder 2. The inner cylinder inner cover 6 pushes the trigger rod 211 to move towards the bottom of the inner cylinder 2. The trigger rod 211 drives the locking block 213 to move synchronously through the first push plate 24 and the third elastic element 215. During the movement of the locking block 213, the second anti-reverse rack 23 on the locking block 213 contacts the first anti-reverse rack 22 on the limiting block 216. The second anti-reverse rack 23 moves past the first anti-reverse rack 22 and drives the limiting block 216 to move towards the spent fuel 5. When the limiting block 216 abuts against the surface of the spent fuel 5, the first anti-reverse rack 22 and the second anti-reverse rack 23 lock together, so that the limiting block 216 presses the spent fuel 5 against the storage sleeve. During the movement of the locking block 213 pushing the limiting block 216, when one limiting block 216 abuts against the spent fuel 5, as the locking block 213 continues to move, the locking block 213 will drive the trigger rod 211 to move horizontally. The trigger rod 211 drives the translation block 26 to move in the translation groove 27, so that the other limiting block 216 can continue to move until it abuts against the spent fuel 5. Subsequently, when transporting the spent fuel 5, the container is placed horizontally so that the marking line 20 is located at the top of the outer cylinder 1. At this time, the limiting block 216 can abut against the spent fuel 5 horizontally, so that the spent fuel 5 will not shake in the storage sleeve during transportation.

[0049] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A long-life container for both storage and transportation of spent fuel, characterized in that: The outer cylinder (1) and inner cylinder (2) are open at one end. A neutron shielding layer (3) is fixedly provided on the outside of the outer cylinder (1). A gamma-ray shielding filling layer (4) is provided inside the outer cylinder (1). The inner cylinder (2) is located inside the outer cylinder (1). Spent fuel (5) is placed inside the inner cylinder (2). An inner cylinder inner cover (6) and an inner cylinder outer cover (7) are arranged sequentially from the inside to the outside at the open end of the inner cylinder (2). An outer cylinder inner cover (8) and an outer cylinder outer cover (9) are arranged sequentially from the inside to the outside at the open end of the outer cylinder (1). Shock absorbers (10) can be detachably provided at both ends of the outer cylinder (1) along its length.

2. The dual-purpose, long-life container for spent fuel storage and transportation according to claim 1, characterized in that: The inner cylinder inner cover (6) is welded to the opening end of the inner cylinder (2), the inner cylinder outer cover (7) is welded to the opening end of the inner cylinder (2), the outer cylinder inner cover (8) is detachably mounted on the opening end of the outer cylinder (1) by bolts, and the outer cylinder outer cover (9) is detachably fixed on the opening end of the outer cylinder (1) by bolts.

3. The dual-purpose, long-life container for spent fuel storage and transportation according to claim 2, characterized in that: The inner cover of the outer cylinder (8) is provided with two first metal sealing rings (11) at radial intervals on the side wall near the outer cylinder (1), and the outer cover of the outer cylinder (9) is provided with a second metal sealing ring (12) on the side wall near the inner cover of the outer cylinder (8).

4. The dual-purpose, long-life container for spent fuel storage and transportation according to claim 1, characterized in that: Multiple storage sleeves (13) are spaced apart inside the inner cylinder (2), and spent fuel (5) is placed inside the storage sleeves (13). Multiple support plates (14) are spaced apart along their own axial direction inside the inner cylinder (2), and multiple support plates (14) are inserted through each storage sleeve (13).

5. A long-life container for both storage and transportation of spent fuel according to claim 4, characterized in that: Multiple heat-conducting plates (15) are spaced apart along their own axial direction inside the inner cylinder (2). Each storage sleeve (13) is provided with multiple heat-conducting plates (15). The inner and outer sides of the heat-conducting plates (15) respectively abut against the outer wall of the storage sleeve (13) and the inner wall of the inner cylinder (2).

6. A long-life container for both storage and transportation of spent fuel according to claim 5, characterized in that: The inner cylinder (2) is filled with a heat-conducting medium.

7. A long-life container for both storage and transportation of spent fuel according to claim 6, characterized in that: The inner cylinder body cover (6) is provided with an air inlet channel (16) and an air outlet channel (17), and the inner cylinder body (2) is provided with quick connectors in both the air inlet channel (16) and the air outlet channel (17).

8. A long-life container for both storage and transportation of spent fuel according to claim 4, characterized in that: A limiting strip (18) is fixedly installed on the inner side wall of the inner cylinder (2), and a limiting groove (19) is opened on the outer side wall of the support plate (14). The limiting strip (18) is inserted into the limiting groove (19). A marking line (20) is formed on the outer side wall of the neutron shielding layer (3). The marking line (20) and the limiting strip (18) are on the same straight line along the radial direction of the outer cylinder (1). A limiting component (21) is provided between each two adjacent storage sleeves (13). The limiting component (21) is used to abut and limit the spent fuel (5) in the storage sleeve (13) along the direction of the line connecting the vertical limiting strip (18) and the marking line (20).

9. A long-life container for both storage and transportation of spent fuel according to claim 8, characterized in that: The limiting component (21) includes a trigger rod (211), a first elastic element (212), a locking block (213), a second elastic element (214), a third elastic element (215), and a limiting block (216). The limiting block (216) is slidably disposed inside the side wall of the storage sleeve (13). The two ends of the first elastic element (212) are respectively connected to the limiting blocks (216) in two adjacent storage sleeves (13) and pull the two limiting blocks (216) to move closer to each other. The trigger rod (211) slides through multiple support plates (14) and is located between two adjacent limiting blocks (216). The second elastic element (214) is disposed at the bottom of the inner cavity of the outer cylinder (1). The second elastic element (214) is used to push the top end of the trigger rod (211) out of the opening end of the inner cylinder (2). The end of the trigger rod (211) abuts against the inner cover of the inner cylinder. (6); The locking block (213) is slidably mounted on the trigger rod (211). The end of the locking block (213) is set with a sharp corner and moves to contact two limiting blocks (216). The third elastic element (215) is mounted on the trigger rod (211) and abuts against the locking block (213). The side wall of the limiting block (216) near the trigger rod (211) is inclined towards the trigger rod (211). The inclined wall of the limiting block (216) is provided with a first anti-reverse rack (22). The bottom end of the locking block (213) is provided with a second anti-reverse rack (23) on both sides. When the locking block (213) moves towards the bottom of the inner cylinder (2), the second anti-reverse rack (23) moves past the first anti-reverse rack (22). When the limiting block (216) moves away from the spent fuel (5), the first anti-reverse rack (22) and the second anti-reverse rack (23) are locked.

Images