Top cover of transport container and container

Abstract

The invention discloses a top cover of a transportation container and the container. The top cover comprises a cover body, a shielding piece and a locking piece. A pivoting space and a conveying channel are defined by the cover body, and in the first direction of the top cover, the conveying channel penetrates through the cover body and communicates with the pivoting space, and the conveying channel communicates with the containing space of the transportation container; the shielding piece is installed in the pivoting space in a pivoted mode, a communication hole penetrating through the shielding piece is formed in the peripheral wall of the shielding piece, the communication hole is suitable for being opposite to and communicating with the conveying channel and suitable for driving the shielding piece to rotate so that the shielding piece can communicate with or block the conveying channel, and the shielding piece is used for shielding nuclear radiation; the locking piece is arranged on the cover body and used for locking or unlocking the shielding piece. The shielding part is driven to rotate to block the conveying channel, an operator does not need to visually adjust the mounting position of the top cover, so that the loading efficiency of the nuclear spent fuel rod can be improved, the top cover is directly in butt joint with the hot chamber, then the shielding part is driven to rotate to open the conveying channel, and the operator can be prevented from being subjected to nuclear radiation as much as possible.

Description

Technical Field

[0001] The present application relates to the field of nuclear fuel transportation equipment, and in particular to a top cover of a transportation container and a container having the top cover. Background Art

[0002] In the related art, spent fuel rods need to be transported in special transport containers, and the open mouth of the transport container is provided with a top cover to prevent nuclear radiation leakage. When the spent fuel rods in the spent fuel pool are loaded into the transport container, the top cover must be removed first and then the transport container must be hoisted into the spent fuel pool to load the spent fuel rods into the transport container. After the spent fuel rods are loaded into the transport container, the top cover is hoisted into the spent fuel pool and installed to the open mouth of the transport container, and the top cover must be accurately installed to a preset position to avoid nuclear radiation leakage. When installing the top cover to the transport container, the operator visually installs the top cover to the open mouth of the transport container in a safe area. The safe area is far away from the transport container, and it is difficult for the operator to clearly identify the installation position of the top cover, resulting in the need to adjust the position of the top cover multiple times, which reduces the loading efficiency of the spent fuel rods.

[0003] Furthermore, when the spent fuel rods in the spent fuel pool are moved out of the transport container, the top cover must be removed first and then the transport container must be docked with the hot chamber to transfer the spent fuel rods to the hot chamber. After the top cover is removed, the operators are susceptible to nuclear radiation, which reduces the safety of transporting the spent fuel rods. Summary of the invention

[0004] In order to improve the loading efficiency of spent nuclear fuel rods, improve the transportation safety of spent nuclear fuel rods, and avoid operators from being exposed to nuclear radiation as much as possible, the present application provides a top cover of a transport container.

[0005] The present application further proposes a container.

[0006] The top cover of a transport container provided in the present application adopts the following technical solution: A top cover of a transport container, the top cover is arranged at an open mouth of the transport container, the transport container is used to transport spent nuclear fuel rods, and comprises: a cover body, the cover body defines a pivot space and a conveying channel, along a first direction of the top cover, the conveying channel passes through the cover body and is connected with the pivot space, and the conveying channel is connected with the accommodating space of the transport container, and the spent nuclear fuel rods enter or move out of the transport container through the conveying channel.

[0007] A shielding member, the shielding member is pivotally installed in the pivot space, the outer peripheral wall of the shielding member is provided with a connecting hole penetrating the shielding member, the connecting hole is suitable for being opposite to and connected with the conveying channel, and is suitable for driving the shielding member to rotate around the pivot axis between the shielding member and the cover body so that the shielding member connects with or blocks the conveying channel, and the shielding member is used to shield nuclear radiation.

[0008] A locking member is disposed on the cover body and is used to lock or unlock the shielding member.

[0009] By adopting the above technical solution, by setting a conveying channel in the cover body, and pivotally installing the shielding member in the cover body, the shielding member is driven to rotate so that the connecting hole is connected with the conveying channel, and the spent fuel rod enters or moves out of the conveying container through the conveying channel, and the shielding member is driven to rotate so that the connecting hole is not connected with the conveying channel, and the outer peripheral wall of the shielding member that is not penetrated by the connecting hole is opposite to the conveying channel, and the shielding member shields the nuclear radiation of the spent fuel rod. Compared with the prior art, after the spent fuel rod is loaded into the transport container, the shielding member is driven to rotate to block the conveying channel, and the operator does not need to visually adjust the installation position of the top cover, thereby improving the loading efficiency of the spent fuel rod. When the spent fuel rod is removed from the transport container, the top cover is directly docked with the hot chamber, and then the shielding member is driven to rotate to open the conveying channel, thereby avoiding the operator from being exposed to nuclear radiation as much as possible, and improving the transportation safety of the spent fuel rod.

[0010] Preferably, a driving shaft is provided on the outer peripheral wall of the shielding member, and an avoidance hole is provided on the outer peripheral wall of the cover body, and the avoidance hole is communicated with the pivot space, and the driving shaft is pivotally matched with the avoidance hole, and is suitable for driving the shielding member to rotate around the pivot axis between the shielding member and the cover body by driving the driving shaft, and the central axis of the driving shaft and the central axis of the conveying channel are vertically arranged.

[0011] By adopting the above technical solution, the operator drives the drive shaft to rotate around the pivot axis between the drive shaft and the avoidance hole by rotating the tool, and the drive shaft drives the shielding member to rotate, thereby achieving the technical effect of driving the shielding member to rotate by the drive shaft.

[0012] Preferably, a pivot shaft is provided on the outer peripheral wall of the shielding member, and along the second direction of the top cover, the pivot shaft and the driving shaft are arranged opposite to each other, and the central axis of the pivot shaft and the central axis of the driving shaft are coaxially arranged, and an accommodating hole is provided on the inner wall of the pivot space opposite to the avoidance hole, and the pivot shaft and the accommodating hole are pivoted and positioned to match.

[0013] By adopting the above technical solution, through the pivotal cooperation between the pivot shaft and the receiving hole, the receiving hole can assist in positioning the shielding member, preventing the end wall of the shielding member away from the pivot shaft from deviating from the preset position, thereby avoiding the failure of the communication hole to communicate with the conveying channel, and further improving the working reliability of the top cover.

[0014] Preferably, the shielding member defines a shielding space, the shielding space is disposed around the outer side of the communication hole, a first isolation member and a plurality of second isolation members are arranged in the shielding space, the plurality of second isolation members are sequentially arranged along the circumferential direction of the top cover, and the plurality of second isolation members are disposed around the outer side of the communication hole, the first isolation member covers the outer sides of the plurality of second isolation members, and both the first isolation member and the second isolation members are used for isolating nuclear radiation.

[0015] By adopting the above technical solution, by covering the plurality of second isolation members on the outer side of the communication hole, it is possible to prevent the radiation of the nuclear fuel rod in the transportation container from passing through the shielding member into the external environment as much as possible, and by filling the space in the shielding space not occupied by the second isolation members with the first isolation member, the weight of the shielding member can be reduced, the difficulty for the operator to drive the shielding member to rotate can be reduced, and further the usage experience of the top cover can be improved.

[0016] Preferably, the locking member is disposed at the end of the conveying channel away from the accommodating space, and the locking member is detachably connected to the cover body. A locking portion is provided on the end wall of the locking member close to the conveying channel, a locking hole is provided on the outer peripheral wall of the shielding member, and the locking hole is adapted to be disposed opposite to the locking portion. The shielding member is locked or unlocked by the locking portion extending into or out of the locking hole.

[0017] By adopting the above technical solution, by disassembling the locking member and moving the locking member out of the conveying channel, the locking portion moves out of the locking hole, so that the shielding member can be driven to rotate. By installing the locking member on the cover body and extending it into the conveying channel, the locking portion extends into the locking hole and is in locking cooperation with the locking hole. When the shielding member rotates, the inner peripheral wall of the locking hole and the locking portion abut against each other, thereby preventing the shielding member from rotating and causing the communication hole and the conveying channel to communicate.

[0018] Preferably, the top cover further includes: a first sealing cover. An accommodation groove is provided on the end wall of the cover body close to the locking member. The accommodation groove communicates with the conveying channel. The locking member is disposed in the accommodation groove. A plurality of first sealing rings are clamped between the locking member and the bottom wall of the accommodation groove. The plurality of first sealing rings are spaced apart along the radial direction of the top cover. A first detection gap is defined between any two adjacent first sealing rings. The locking member is provided with a first detection hole. The first detection hole is opposite to and communicates with one of the plurality of first detection gaps. The first detection hole is used to detect whether there is a leakage marking medium in the first detection gap. The first sealing cover is detachably mounted on the first detection hole.

[0019] By adopting the above technical solution, it is detected through the first detection hole whether there is a leakage marking medium in the first detection gap to determine whether the locking member and the bottom wall of the accommodation groove are hermetically arranged, so as to avoid as much as possible the nuclear radiation of the nuclear fuel rod in the transport container from entering the external environment through the gap between the locking member and the bottom wall of the accommodation groove, and avoid as much as possible the occurrence of nuclear radiation leakage accidents, and further improve the use reliability of the top cover.

[0020] Preferably, the top cover further includes: a closing member. An air conveying channel is defined by the cover body. One end of the air conveying channel forms an air injection hole on the end wall of the cover body away from the transport container. The other end of the air conveying channel communicates with the conveying channel, and the connection between the air conveying channel and the conveying channel is located on the side of the shielding member close to the transport container. An air filling member is provided in the air conveying channel. The air filling member is adapted to communicate with an air pump. The air pump injects gas into the transport container through the air filling member. The closing member is detachably mounted on the air injection hole, and the closing member is in sealing cooperation with the air injection hole.

[0021] By adopting the above technical solution, the air pump injects gas into the transport container through the air filling member and the air conveying channel. Under the pressure of the gas, the liquid in the transport container flows into the spent fuel pool through the liquid discharge port, so as to avoid the liquid in the transport container from flowing into the external environment after the transport container leaves the spent fuel pool, avoid the occurrence of nuclear radiation leakage accidents, and further improve the safety of nuclear fuel rod transportation.

[0022] Preferably, the top cover further includes: a second sealing cover. A plurality of second sealing rings are clamped between the closing member and the bottom wall of the air injection hole. The plurality of second sealing rings are spaced apart along the radial direction of the top cover. A second detection gap is defined between any two adjacent second sealing rings. The closing member is provided with a second detection hole. The second detection hole is opposite to and communicates with one of the plurality of second detection gaps. The second detection hole is used to detect whether there is a leakage marking medium in the second detection gap. The second sealing cover is detachably mounted on the second detection hole.

[0023] By adopting the above technical solution, the second detection hole is used to detect whether there is a leakage marking medium in the second detection gap, so as to determine whether the sealing member and the bottom wall of the gas transmission hole are sealed, thereby preventing the nuclear radiation of the spent fuel rods in the transport container from entering the external environment through the gap between the sealing member and the bottom wall of the gas transmission hole, and preventing nuclear radiation leakage accidents from occurring, thereby improving the reliability of the top cover.

[0024] Preferably, the top cover also includes: a third sealing cover, the outer peripheral wall of the cover body is provided with a limiting portion, the limiting portion is suitable for limiting cooperation with the end wall of the transport container close to the top cover, a plurality of third sealing rings are sandwiched between the limiting portion and the end wall of the transport container close to the top cover, the plurality of third sealing rings are spaced apart along the radial direction of the top cover, a third detection gap is defined between any two adjacent third sealing rings, the limiting portion is provided with a third detection hole, the third detection hole is opposite to and connected to one of the plurality of third detection gaps, the third detection hole is used to detect whether there is leakage of marking medium in the third detection gap, and the third sealing cover is detachably mounted on the third detection hole.

[0025] By adopting the above technical solution, whether there is a leakage marking medium in the third detection gap is detected through the third detection hole to determine whether the limiting part and the end wall of the transport container close to the top cover are sealed, thereby preventing the nuclear radiation of the spent fuel rods in the transport container from entering the external environment through the gap between the limiting part and the end wall of the transport container close to the top cover, and preventing nuclear radiation leakage accidents from occurring. This can improve the reliability of the top cover.

[0026] The container provided in this application adopts the following technical solution: A container comprises: a transport container, the transport container defines a storage space, the storage space forms an opening at the end of the transport container, and the storage space is used to store spent nuclear fuel rods; a top cover, the top cover is arranged at the opening of the container, the top cover is used to open or close the storage space, and the top cover is a top cover of the above-mentioned transport container.

[0027] By adopting the above technical solution, by setting a conveying channel in the cover body, and pivotally installing the shielding member in the cover body, the shielding member is driven to rotate so that the connecting hole is connected with the conveying channel, and the spent fuel rod enters or moves out of the conveying container through the conveying channel, and the shielding member is driven to rotate so that the connecting hole is not connected with the conveying channel, and the outer peripheral wall of the shielding member that is not penetrated by the connecting hole is opposite to the conveying channel, and the shielding member shields the nuclear radiation of the spent fuel rod. Compared with the prior art, after the spent fuel rod is loaded into the transport container, the shielding member is driven to rotate to block the conveying channel, and the operator does not need to visually adjust the installation position of the top cover, thereby improving the loading efficiency of the spent fuel rod. When the spent fuel rod is removed from the transport container, the top cover is directly docked with the hot chamber, and then the shielding member is driven to rotate to open the conveying channel, thereby avoiding the operator from being exposed to nuclear radiation as much as possible, and improving the transportation safety of the spent fuel rod.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting a conveying channel in the cover body and pivotally installing the shielding member in the cover body, the shielding member is driven to rotate so that the connecting hole is connected with the conveying channel, and the spent fuel rods enter or move out of the conveying container through the conveying channel. The shielding member is driven to rotate so that the connecting hole is not connected with the conveying channel, and the outer peripheral wall of the shielding member that is not penetrated by the connecting hole is opposite to the conveying channel, and the shielding member shields the nuclear radiation of the spent fuel rods. Compared with the prior art, after the spent fuel rods are loaded into the transport container, the shielding member is driven to rotate to block the conveying channel, and the operator does not need to visually adjust the installation position of the top cover, thereby improving the loading efficiency of the spent fuel rods. When the spent fuel rods are removed from the transport container, the top cover is directly docked with the hot chamber, and then the shielding member is driven to rotate to open the conveying channel, thereby avoiding the operator from being exposed to nuclear radiation as much as possible, and improving the transportation safety of the spent fuel rods; 2. Detecting whether there is a leakage marking medium in the first detection gap through the first detection hole to determine whether the locking member and the bottom wall of the receiving groove are sealed, thereby preventing the nuclear radiation of the spent fuel rods in the transport container from entering the external environment through the gap between the locking member and the bottom wall of the receiving groove, thereby preventing nuclear radiation leakage accidents from occurring, and further improving the reliability of the top cover; 3. The air pump injects gas into the transport container through the inflator and the gas transmission channel. Under the pressure of the gas, the liquid in the transport container flows into the spent fuel pool through the drain port, thereby preventing the liquid in the transport container from flowing into the external environment after the transport container leaves the spent fuel pool, avoiding nuclear radiation leakage accidents, and further improving the safety of nuclear spent fuel rod transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of a top cover according to an embodiment of the present application; Figure 2 is a cross-sectional view of the top cover according to an embodiment of the present application; Figure 3 is a schematic diagram of the shielding member according to an embodiment of the present application; Figure 4 is a cross-sectional view of the top cover from another angle according to an embodiment of the present application; Figure 5 is Figure 4 an enlarged schematic view of part A in Figure 6 is Figure 4 an enlarged schematic view of part B in Figure 7 is Figure 4 an enlarged schematic view of part C in Figure 8 is a schematic diagram of the container according to an embodiment of the present application.

[0030] Description of reference numerals: 100, top cover; 200, container; 1, transport container; 11, accommodation space; 12, open mouth; 2, cover body; 21, pivot space; 211, accommodation hole; 22, conveying channel; 23, avoidance hole; 24, accommodation groove; 25, gas transmission channel; 251, gas transmission hole; 252, inflation member; 26, limiting portion; 261, third sealing ring; 262, third detection gap; 263, third detection hole; 3, shielding member; 31, communication hole; 32, drive shaft; 33, pivot shaft; 34, shielding space; 341, first isolation member; 342, second isolation member; 35, locking hole; 4, locking member; 41, locking portion; 42, first sealing ring; 43, first detection gap; 44, first detection hole; 5, first sealing cover; 6, closing member; 61, second sealing ring; 62, second detection gap; 63, second detection hole; 7, second sealing cover; 8, third sealing cover. Detailed implementation manners

[0031] The following further elaborates on the present application in conjunction with the attached Figures 1-8 drawings.

[0032] An embodiment of the present application discloses a top cover 100 of a transport container 1. The top cover 100 is provided at the open mouth 12 of the transport container 1, and the transport container 1 is used for transporting nuclear spent fuel rods.

[0033] Refer to Figure 1 , Figure 2 and Figure 8, the top cover 100 of the transport container 1 according to the embodiment of the present application includes: a cover body 2, a shielding member 3, and a locking member 4. The cover body 2 defines a pivoting space 21 and a conveying channel 22. Along the first direction of the top cover 100, the conveying channel 22 penetrates through the cover body 2 and communicates with the pivoting space 21, and the conveying channel 22 communicates with the accommodation space 11 of the transport container 1. The nuclear spent fuel rod enters or exits the transport container 1 through the conveying channel 22. The first direction of the top cover 100 may refer to Figure 2 the up-down direction in Figure 2 . Specifically, the pivoting space 21 is located between the upper end wall and the lower end wall of the cover body 2. The conveying channel 22 penetrates through the cover body 2, and the open end of the conveying channel 22 close to the lower end wall of the cover body 2 communicates with the accommodation space 11.

[0034] Furthermore, the cover body 2 is hermetically arranged with the transport container 1.

[0035] The shielding member 3 is pivotally installed in the pivoting space 21. A communication hole 31 penetrating through the shielding member 3 is provided on the outer peripheral wall of the shielding member 3. Specifically, the communication hole 31 penetrates through the shielding member 3 along the radial direction of the shielding member 3. The communication hole 31 is adapted to be opposite to and communicate with the conveying channel 22. By driving the shielding member 3 to rotate around the pivot axis 33 line between the shielding member 3 and the cover body 2, the shielding member 3 can communicate or block the conveying channel 22. The shielding member 3 is used to shield nuclear radiation.

[0036] When the nuclear spent fuel rod needs to enter or exit the transport container 1, the operator uses a rotating tool to drive the shielding member 3 to rotate. The shielding member 3 drives the communication hole 31 to rotate close to the communication part of the pivoting space 21 and the conveying channel 22, so that the communication hole 31 is opposite to and communicates with the conveying channel 22. That is to say, the shielding member 3 communicates the conveying channel 22, and the fuel rod enters or exits the transport container 1 through the conveying channel 22.

[0037] After the nuclear spent fuel rod is loaded into the transport container 1 or the nuclear spent fuel rod has been removed from the transport container 1, the operator uses a rotating tool to drive the shielding member 3 to rotate. The shielding member 3 drives the communication hole 31 to rotate away from the communication part of the pivoting space 21 and the conveying channel 22, so that the outer peripheral wall of the shielding member 3 not penetrated by the communication hole 31 is opposite to the conveying channel 22, and the communication hole 31 is not opposite to and does not communicate with the conveying channel 22. That is to say, the shielding member 3 blocks the conveying channel 22, thereby achieving the technical effect of shielding the nuclear radiation of the nuclear spent fuel rod.

[0038] It should be noted that when transporting the nuclear spent fuel rod to the hot cell, the top cover 100 is first docked with the corresponding equipment in the hot cell, and then the operator drives the shielding member 3 to rotate. When the operator uses a rotating tool to drive the shielding member 3 to rotate, the operator is in a safe area, and the nuclear radiation in the safe area is not greater than the preset nuclear radiation standard.

[0039] Furthermore, the operator can also use the wireless network to control the robot arm to drive the shielding member 3 to rotate.

[0040] Furthermore, the shape of the shielding member 3 and the shape of the pivot space 21 can both be constructed as a cylinder. In this way, the shielding member 3 is limited in the pivot space 21 along the axial direction of the shielding member 3, thereby preventing the shielding member 3 from moving along the axial direction of the shielding member 3, resulting in the connecting hole 31 being unable to connect with the conveying channel 22, thereby improving the working reliability of the top cover 100.

[0041] In addition, a locking member 4 is provided on the cover body 2, and the locking member 4 is used to lock or unlock the shielding member 3. When the spent fuel rods need to enter or move out of the transport container 1, the locking member 4 unlocks the shielding member 3 so that the shielding member 3 can rotate. When the spent fuel rods are loaded into the transport container 1 or the spent fuel rods have been moved out of the transport container 1, and the shielding member 3 blocks the conveying channel 22, the locking member 4 locks the shielding member 3, thereby preventing the shielding member 3 from rotating during the transportation of the spent fuel rods, causing the connecting hole 31 to be connected with the conveying channel 22, thereby preventing a nuclear radiation leakage accident.

[0042] Thus, by providing the conveying channel 22 on the cover body 2 and pivotally installing the shielding member 3 in the cover body 2, the shielding member 3 is driven to rotate so that the communicating hole 31 is communicated with the conveying channel 22, and the spent fuel rod enters or moves out of the conveying container 200 through the conveying channel 22. By driving the shielding member 3 to rotate so that the communicating hole 31 is not communicated with the conveying channel 22, the outer peripheral wall of the shielding member 3 that is not penetrated by the communicating hole 31 is opposite to the conveying channel 22, and the shielding member 3 shields the nuclear radiation of the spent fuel rod. Compared with the prior art, after the spent fuel rod is loaded into the transport container 1, the shielding member 3 is driven to rotate to block the conveying channel 22, and the operator does not need to visually adjust the installation position of the top cover 100, thereby improving the loading efficiency of the spent fuel rod. When the spent fuel rod is removed from the transport container 1, the top cover 100 is directly docked with the hot chamber, and then the shielding member 3 is driven to rotate to open the conveying channel 22, thereby avoiding the operator from being exposed to nuclear radiation as much as possible, and improving the transportation safety of the spent fuel rod.

[0043] Reference Figures 1-3 In some embodiments of the present application, a driving shaft 32 is provided on the outer peripheral wall of the shielding member 3, and an avoidance hole 23 is provided on the outer peripheral wall of the cover body 2, and the avoidance hole 23 is connected with the pivot space 21, that is, the avoidance hole 23 passes through the outer peripheral wall of the cover body 2 in the direction of the pivot space 21. It should be noted that the avoidance hole 23 does not completely pass through the cover body 2.

[0044] The drive shaft 32 is pivotally fitted with the avoidance hole 23 and is adapted to drive the shielding member 3 to rotate about the pivot axis 33 line between the shielding member 3 and the cover body 2 by driving the drive shaft 32. The central axis of the drive shaft 32 and the central axis of the conveying channel 22 are perpendicularly arranged. Specifically, the drive shaft 32 extends into the avoidance hole 23, and the drive shaft 32 is pivotally fitted with the avoidance hole 23. The operator inserts a rotating tool into the avoidance hole 23, and the pivot tool is connected and fitted with the drive shaft 32. The operator drives the drive shaft 32 to rotate about the pivot axis 33 line between the drive shaft 32 and the avoidance hole 23 through the rotating tool, and the drive shaft 32 drives the shielding member 3 to rotate, so that the technical effect of driving the shielding member 3 to rotate through the drive shaft 32 can be achieved.

[0045] Furthermore, the end wall of the drive shaft 32 away from the shielding member 3 can be flush with the outer peripheral wall of the cover body 2. The rotating tool does not need to extend into the avoidance hole 23 to be connected and fitted with the drive shaft 32, so that the connection difficulty between the drive shaft 32 and the rotating tool can be reduced, and the connection efficiency between the drive shaft 32 and the rotating tool can be improved.

[0046] In some specific embodiments, an internal hexagonal hole is provided on the end wall of the drive shaft 32 away from the shielding member 3, and the rotating tool can be a hexagonal wrench.

[0047] Refer to Figure 2 and Figure 3 , in some embodiments of the present application, a pivot axis 33 is provided on the outer peripheral wall of the shielding member 3. Along the second direction of the top cover 100, the second direction of the top cover 100 can refer to Figure 2 the left - right direction in

[0048] The inner wall of the pivot space 21 opposite to the avoidance hole 23 is provided with a receiving hole 211. Specifically, the receiving hole 211 is provided on the left inner wall of the pivot space 21, and the avoidance hole 23 is provided on the right inner wall of the pivot space 21. The central axis of the avoidance hole 23 and the central axis of the receiving hole 211 are coaxially arranged.

[0049] The pivot axis 33 extends into the receiving hole 211, and the pivot axis 33 and the receiving hole 211 are pivotally and positioning - fitted. When the shielding member 3 rotates, through the pivotal fit between the pivot axis 33 and the receiving hole 211, the receiving hole 211 can assist in positioning the shielding member 3, and it can be avoided that the end wall of the shielding member 3 away from the pivot axis 33 deviates from the preset position, so that it can be avoided that the communication hole 31 cannot communicate with the conveying channel 22, and the working reliability of the top cover 100 can be improved.

[0050] Refer to Figure 2 and Figure 4, in some embodiments of the present application, the shielding member 3 defines a shielding space 34, the shielding space 34 is disposed around the outside of the communication hole 31, a first isolation member 341 and a plurality of second isolation members 342 are provided in the shielding space 34, the plurality of second isolation members 342 are arranged in sequence along the circumferential direction of the top cover 100, and the plurality of second isolation members 342 are disposed around the outside of the communication hole 31, the first isolation member 341 covers the outside of the plurality of second isolation members 342, and both the first isolation member 341 and the second isolation member 342 are used for isolating nuclear radiation.

[0051] In some specific embodiments, the first isolation member 341 may be a lead block, the second isolation member 342 may be a tungsten block, the radiation shielding ability of the first isolation member 341 is less than that of the second isolation member 342, and the weight of the first isolation member 341 is less than that of the second isolation member 342.

[0052] Specifically, when only the first isolation member 341 is provided in the shielding space 34, the radiation shielding ability of the first isolation member 341 is relatively low, and the radiation of the nuclear spent fuel rod in the transportation container 1 is likely to pass through the first isolation member 341 and enter the external environment. That is to say, the radiation of the nuclear spent fuel rod in the transportation container 1 is likely to pass through the shielding member 3 and enter the external environment. When only the second isolation member 342 is provided in the shielding space 34, the radiation shielding ability of the second isolation member 342 is relatively strong, and the radiation of the nuclear spent fuel rod in the transportation container 1 is difficult to pass through the second isolation member 342 and enter the external environment, but the weight of the second isolation member 342 is relatively heavy, and it is difficult for the operator to drive the shielding member 3 to rotate.

[0053] By covering the plurality of second isolation members 342 around the outside of the communication hole 31, it is possible to prevent, as much as possible, the radiation of the nuclear spent fuel rod in the transportation container 1 from passing through the shielding member 3 and entering the external environment, and by filling the space in the shielding space 34 that is not occupied by the second isolation members 342 with the first isolation member 341, the weight of the shielding member 3 can be reduced, the difficulty for the operator to drive the shielding member 3 to rotate can be reduced, and thus the use experience of the top cover 100 can be improved.

[0054] Refer to Figure 2 and Figure 4 , in some embodiments of the present application, the locking member 4 is disposed at the end of the conveying channel 22 away from the accommodating space 11, and the locking member 4 is detachably connected to the cover body 2. That is to say, along the first direction of the top cover 100, the locking member 4 is detachably installed at the upper end of the conveying channel 22. A locking portion 41 is provided on the end wall of the locking member 4 close to the conveying channel 22, and a locking hole 35 is provided on the outer peripheral wall of the shielding member 3. The locking hole 35 is adapted to be disposed opposite to the locking portion 41. The shielding member 3 is locked or unlocked by the locking portion 41 extending into or out of the locking hole 35.

[0055] Specifically, when the nuclear spent fuel rod needs to enter or exit the transportation container 1, the locking member 4 is disassembled and removed from the conveying channel 22, and the locking portion 41 is removed from the locking hole 35, so that the shielding member 3 can be driven to rotate. After the nuclear spent fuel rod is loaded into the transportation container 1 or the nuclear spent fuel rod has been removed from the transportation container 1, the locking member 4 is installed on the cover body 2 and extends into the conveying channel 22, and the locking portion 41 extends into the locking hole 35 and is in locking cooperation with the locking hole 35. When the shielding member 3 rotates, the inner peripheral wall of the locking hole 35 and the locking portion 41 abut against each other, thereby preventing the shielding member 3 from rotating and causing the communication hole 31 and the conveying channel 22 to communicate with each other.

[0056] Referring Figure 1 , Figure 4 and Figure 5 , in some embodiments of the present application, the top cover 100 may further include: a first sealing cover 5. An accommodating groove 24 is provided on the end wall of the cover body 2 close to the locking member 4. The accommodating groove 24 communicates with the conveying channel 22. The locking member 4 is disposed in the accommodating groove 24. A plurality of first sealing rings 42 are clamped between the locking member 4 and the bottom wall of the accommodating groove 24. The plurality of first sealing rings 42 are spaced apart along the radial direction of the top cover 100. A first detection gap 43 is defined between any two adjacent first sealing rings 42.

[0057] The locking member 4 is provided with a first detection hole 44. The first detection hole 44 is opposite to and communicates with one of the plurality of first detection gaps 43. The first detection hole 44 is used to detect whether there is a leakage marking medium in the first detection gap 43. Specifically, the detection member of the leakage marking medium detection device is connected and matched with the first detection hole 44. The leakage marking medium detection device detects whether there is a leakage marking medium in the first detection gap 43 through the first detection hole 44.

[0058] After the nuclear spent fuel rod is loaded into the transportation container 1, a leakage marking medium is injected into the transportation container 1. By detecting whether there is a leakage marking medium in the first detection gap 43, it is determined whether the locking member 4 and the bottom wall of the accommodating groove 24 are hermetically arranged. When there is a leakage marking medium in the first detection gap 43, that is, the leakage marking medium in the transportation container 1 passes through the first sealing ring 42 close to the conveying channel 22 and enters the first detection gap 43, the locking member 4 and the bottom wall of the accommodating groove 24 are not hermetically arranged, and there is a gap communicating with the external environment between the locking member 4 and the bottom wall of the accommodating groove 24. The nuclear radiation of the nuclear spent fuel rod in the transportation container 1 passes through the gap between the locking member 4 and the bottom wall of the accommodating groove 24 and enters the external environment.

[0059] When there is no leakage marking medium in the first detection gap 43, that is to say, a sealing arrangement is provided between the locking member 4 and the bottom wall of the receiving groove 24, and there is no gap communicating with the external environment between the locking member 4 and the bottom wall of the receiving groove 24, so that the nuclear radiation of the spent nuclear fuel rod in the transport container 1 can be prevented from entering the external environment through the gap between the locking member 4 and the bottom wall of the receiving groove 24.

[0060] After the spent nuclear fuel rod is loaded into the transport container 1 and the locking member 4 is installed on the top cover 100, it is detected through the first detection hole 44 whether there is leakage marking medium in the first detection gap 43 to determine whether a sealing arrangement is provided between the locking member 4 and the bottom wall of the receiving groove 24, so that the nuclear radiation of the spent nuclear fuel rod in the transport container 1 can be prevented from entering the external environment through the gap between the locking member 4 and the bottom wall of the receiving groove 24 as much as possible, the occurrence of nuclear radiation leakage accidents can be avoided as much as possible, and thus the service reliability of the top cover 100 can be improved.

[0061] Moreover, the first sealing cover 5 is detachably installed on the first detection hole 44. Specifically, the first sealing cover 5 is arranged at the end of the first detection hole 44 away from the first detection gap 43. When detecting whether there is leakage marking medium in the first detection gap 43 through the first detection hole 44, the first sealing cover 5 is detached from the first detection hole 44. After completing the detection of whether there is leakage marking medium in the first detection gap 43, the first sealing cover 5 is installed on the first detection hole 44, so that sundries in the external environment can be prevented from entering the first detection hole 44, the first detection hole 44 can be prevented from being blocked, and further, it can be prevented that it is impossible to detect whether there is leakage marking medium in the first detection gap 43 through the first detection hole 44.

[0062] In some specific embodiments, the first detection hole 44 can be opposite to and communicate with the first detection gap 43 close to the conveying channel 22 among the plurality of first detection gaps 43.

[0063] In some specific embodiments, the first sealing ring 42 is preferably a silica gel sealing ring.

[0064] In some specific embodiments, the leakage marking medium is preferably helium.

[0065] Refer to Figure 1 and Figure 4 In some embodiments of the present application, the top cover 100 may further include: a closing member 6. The cover body 2 defines an air conveying channel 25. One end of the air conveying channel 25 forms an air outlet hole 251 on the end wall of the cover body 2 away from the transport container 1. The other end of the air conveying channel 25 communicates with the conveying channel 22, and the connection between the air conveying channel 25 and the conveying channel 22 is located on the side of the shielding member 3 close to the transport container 1. An air filling member 252 is arranged in the air conveying channel 25, and the air filling member 252 is adapted to communicate with an air pump, and the air pump injects gas into the transport container 1 through the air filling member 252.

[0066] The transport container 1 is provided with a liquid discharge port communicating with the accommodation space 11, and a check valve is provided at the liquid discharge port. A sealing is provided between the check valve and the liquid discharge port. After the nuclear spent fuel rods are loaded into the transport container 1 from the spent fuel pool, the transport container 1 is filled with liquid. When the transport container 1 leaves the spent fuel pool, the liquid in the transport container 1 needs to be discharged into the spent fuel pool.

[0067] Specifically, when the transport container 1 leaves the spent fuel pool, the air pump injects gas into the transport container 1 through the inflating member 252 and the gas transmission channel 25. Under the pressure of the gas, the liquid in the transport container 1 flows into the spent fuel pool through the liquid discharge port, so that it can be avoided that after the transport container 1 leaves the spent fuel pool, the liquid in the transport container 1 flows into the external environment, and a nuclear radiation leakage accident can be avoided, thereby improving the safety of transporting nuclear spent fuel rods.

[0068] Furthermore, the inflating member 252 is detachably installed in the gas transmission channel 25. By detaching the inflating member 252, the air pressure in the transport container 1 and the air pressure in the external environment are balanced. Under the action of gravity, the liquid in the transport container 1 flows into the spent fuel pool through the liquid discharge port. After all the liquid in the transport container 1 has flowed into the spent fuel pool, the inflating member 252 is installed into the gas transmission channel 25.

[0069] Moreover, the closing member 6 is detachably installed at the gas inlet hole 251. The closing member 6 is in sealing cooperation with the gas inlet hole 251. After all the liquid in the transport container 1 is completely discharged from the transport container 1, the closing member 6 is installed at the gas inlet hole 251 to close the gas transmission channel 25.

[0070] In some specific embodiments, the inflating member 252 is preferably a valve stem.

[0071] In some specific embodiments, the gas is preferably helium.

[0072] Refer to Figure 1 、 Figure 4 and Figure 6 In some embodiments of the present application, the top cover 100 may further include: a second sealing cover 7. A plurality of second sealing rings 61 are clamped between the closing member 6 and the bottom wall of the gas inlet hole 251. The plurality of second sealing rings 61 are spaced apart along the radial direction of the top cover 100. A second detection gap 62 is defined between any two adjacent second sealing rings 61. The closing member 6 is provided with a second detection hole 63, and the second detection hole 63 is configured as a through hole. The second detection hole 63 is opposite to and communicates with one of the plurality of second detection gaps 62. The second detection hole 63 is used to detect whether there is a leakage marking medium in the second detection gap 62.

[0073] Specifically, the detecting member of the leakage marking medium detecting device is connected and cooperated with the second detecting hole 63, and the leakage marking medium detecting device detects whether there is a leakage marking medium in the second detecting gap 62 through the second detecting hole 63.

[0074] After the nuclear spent fuel rod is loaded into the transportation container 1, the leakage marking medium is injected into the transportation container 1. By detecting whether there is a leakage marking medium in the second detecting gap 62, it is determined whether the seal is set between the closing member 6 and the bottom wall of the air inlet hole 251. When there is a leakage marking medium in the second detecting gap 62, that is to say, the leakage marking medium in the transportation container 1 passes through the second sealing ring 61 close to the conveying channel 22 and enters the second detecting gap 62, and the seal is not set between the closing member 6 and the bottom wall of the air inlet hole 251. There is a gap communicating with the external environment between the closing member 6 and the bottom wall of the air inlet hole 251, and the nuclear radiation of the nuclear spent fuel rod in the transportation container 1 will pass through the gap between the closing member 6 and the bottom wall of the air inlet hole 251 and enter the external environment.

[0075] When there is no leakage marking medium in the second detecting gap 62, that is to say, the seal is set between the closing member 6 and the bottom wall of the air inlet hole 251, and there is no gap communicating with the external environment between the closing member 6 and the bottom wall of the air inlet hole 251, so that the nuclear radiation of the nuclear spent fuel rod in the transportation container 1 can be prevented from passing through the gap between the closing member 6 and the bottom wall of the air inlet hole 251 and entering the external environment.

[0076] After the nuclear spent fuel rod is loaded into the transportation container 1 and the closing member 6 is installed on the air inlet hole 251, it is detected whether there is a leakage marking medium in the second detecting gap 62 through the second detecting hole 63 to determine whether the seal is set between the closing member 6 and the bottom wall of the air inlet hole 251, so that the nuclear radiation of the nuclear spent fuel rod in the transportation container 1 can be prevented from passing through the gap between the closing member 6 and the bottom wall of the air inlet hole 251 and entering the external environment as much as possible, the occurrence of nuclear radiation leakage accidents can be avoided as much as possible, and the use reliability of the top cover 100 can be improved accordingly.

[0077] Moreover, the second sealing cover 7 is detachably installed on the second detecting hole 63. After detecting whether there is a leakage marking medium in the second detecting gap 62, the second sealing cover 7 is installed on the second detecting hole 63, so that sundries in the external environment can be prevented from entering the second detecting hole 63, the second detecting hole 63 can be prevented from being blocked, and it can be avoided that it is impossible to detect whether there is a leakage marking medium in the second detecting gap 62 through the second detecting hole 63.

[0078] In some specific embodiments, the second detecting hole 63 can be opposite to and communicate with the second detecting gap 62 closest to the conveying channel 22 among a plurality of second detecting gaps 62.

[0079] In some specific embodiments, the second sealing ring 61 is preferably a silicone sealing ring.

[0080] Referring Figure 4 and Figure 7 , in some embodiments of the present application, the top cover 100 may further include: a third sealing cover 8. A limiting portion 26 is provided around the outer peripheral wall of the cover body 2. The limiting portion 26 is adapted to be in limiting cooperation with the end wall of the transportation container 1 close to the top cover 100. Specifically, after the top cover 100 is installed on the transportation container 1, the limiting portion 26 and the end wall of the transportation container 1 close to the top cover 100 are in limiting cooperation, so that the top cover 100 can be prevented from entering the accommodation space 11 of the transportation container 1.

[0081] Moreover, a plurality of third sealing rings 261 are provided between the limiting portion 26 and the end wall of the transportation container 1 close to the top cover 100. The plurality of third sealing rings 261 are arranged at intervals in the radial direction of the top cover 100. A third detection gap 262 is defined between any two adjacent third sealing rings 261. The limiting portion 26 is provided with a third detection hole 263. The third detection hole 263 is opposite to and communicated with one of the plurality of third detection gaps 262. The third detection hole 263 is used to detect whether there is a leakage marking medium in the third detection gap 262.

[0082] Specifically, the detection member of the leakage marking medium detection device is connected and cooperated with the third detection hole 263. The leakage marking medium detection device detects whether there is a leakage marking medium in the third detection gap 262 through the third detection hole 263.

[0083] After the nuclear spent fuel rod is loaded into the transportation container 1, a leakage marking medium is injected into the transportation container 1. By detecting whether there is a leakage marking medium in the third detection gap 262, it is determined whether the limiting portion 26 and the end wall of the transportation container 1 close to the top cover 100 are hermetically arranged. When there is a leakage marking medium in the third detection gap 262, that is to say, the leakage marking medium in the transportation container 1 passes through the third sealing ring 261 close to the conveying channel 22 and enters the third detection gap 262. The limiting portion 26 and the end wall of the transportation container 1 close to the top cover 100 are not hermetically arranged, and there is a gap communicating with the external environment between the limiting portion 26 and the end wall of the transportation container 1 close to the top cover 100. The nuclear radiation of the nuclear spent fuel rod in the transportation container 1 will pass through the gap between the limiting portion 26 and the end wall of the transportation container 1 close to the top cover 100 and enter the external environment.

[0084] When there is no leakage marker medium in the third detection gap 262, that is to say, a sealing arrangement is provided between the limiting portion 26 and the end wall of the transport container 1 close to the top cover 100, and there is no gap communicating with the external environment between the limiting portion 26 and the end wall of the transport container 1 close to the top cover 100, so that the nuclear radiation of the nuclear fuel rods in the transport container 1 can be prevented from entering the external environment through the gap between the limiting portion 26 and the end wall of the transport container 1 close to the top cover 100.

[0085] After the nuclear fuel rods are loaded into the transport container 1 and the top cover 100 is installed on the transport container 1, it is detected through the third detection hole 263 whether there is leakage marker medium in the third detection gap 262 to determine whether a sealing arrangement is provided between the limiting portion 26 and the end wall of the transport container 1 close to the top cover 100, so that the nuclear radiation of the nuclear fuel rods in the transport container 1 can be prevented from entering the external environment through the gap between the limiting portion 26 and the end wall of the transport container 1 close to the top cover 100 as much as possible, the occurrence of nuclear radiation leakage accidents can be avoided as much as possible, and thus the use reliability of the top cover 100 can be improved.

[0086] Moreover, the third sealing cover 8 is detachably installed on the third detection hole 263. After detecting whether there is leakage marker medium in the third detection gap 262, the third sealing cover 8 is installed on the third detection hole 263, so that sundries in the external environment can be prevented from entering the third detection hole 263, the third detection hole 263 can be prevented from being blocked, and it can be avoided that it is impossible to detect whether there is leakage marker medium in the third detection gap 262 through the third detection hole 263.

[0087] In some specific embodiments, the third detection hole 263 can be opposite to and communicate with the third detection gap 262 closest to the conveying channel 22 among a plurality of third detection gaps 262.

[0088] Based on this, with reference to Figure 8 , the present application further discloses a container 200. The container 200 according to the embodiments of the present application includes: a transport container 1 and a top cover 100. The transport container 1 defines an accommodation space 11, and an open mouth 12 is formed at the end of the transport container 1. The accommodation space 11 is used for accommodating nuclear fuel rods; the top cover 100 is provided at the open mouth 12 of the container 200, and the top cover 100 is used to open or close the accommodation space 11, and the top cover 100 is the top cover 100 of the transport container 1 in the above embodiments.

[0089] According to the container 200 described in the embodiment of the present application, the container 200 includes a transport container 1 and a top cover 100. By arranging a conveying channel 22 on the cover body 2 and pivotally installing the shielding member 3 in the cover body 2, the shielding member 3 is driven to rotate so that the connecting hole 31 is connected with the conveying channel 22, and the spent fuel rods enter or move out of the conveying container 200 through the conveying channel 22. By driving the shielding member 3 to rotate so that the connecting hole 31 is not connected with the conveying channel 22, the outer peripheral wall of the shielding member 3 not penetrated by the connecting hole 31 is opposite to the conveying channel 22, and the shielding member 3 shields the nuclear radiation of the spent fuel rods. Compared with the prior art, after the spent fuel rods are loaded into the transport container 1, the shielding member 3 is driven to rotate to block the conveying passage 22, and the operator does not need to visually adjust the installation position of the top cover 100, thereby improving the loading efficiency of the spent fuel rods. When the spent fuel rods are removed from the transport container 1, the top cover 100 is directly docked with the hot chamber, and then the shielding member 3 is driven to rotate to open the conveying passage 22, thereby avoiding the operator from being exposed to nuclear radiation as much as possible, thereby improving the transportation safety of the spent fuel rods.

[0090] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A top cover of a transport container, characterized in that, The top cover (100) is provided at the open mouth (12) of the transportation container (1), and the transportation container (1) is used for transporting nuclear spent fuel rods, including: A cover body (2), the cover body (2) defining a pivoting space (21) and a conveying channel (22). Along the first direction of the top cover (100), the conveying channel (22) penetrates through the cover body (2) and communicates with the pivoting space (21), and the conveying channel (22) communicates with the accommodation space (11) of the transportation container (1). The nuclear spent fuel rods enter or exit the transportation container (1) through the conveying channel (22); A shielding member (3), the shielding member (3) being pivotally installed in the pivoting space (21). A communication hole (31) penetrating through the shielding member (3) is provided on the outer peripheral wall of the shielding member (3). The communication hole (31) is adapted to be opposite to and communicate with the conveying channel (22), and is adapted to drive the shielding member (3) to rotate around the pivot axis (33) line between the shielding member (3) and the cover body (2), so that the shielding member (3) communicates or blocks the conveying channel (22). The shielding member (3) is used for shielding nuclear radiation; A locking member (4), the locking member (4) being provided on the cover body (2), and the locking member (4) being used for locking or unlocking the shielding member (3).

2. The top cover of a transport container according to claim 1, characterized in that, A driving shaft (32) is provided on the outer peripheral wall of the shielding member (3), an avoidance hole (23) is provided on the outer peripheral wall of the cover body (2), and the avoidance hole (23) communicates with the pivoting space (21). The driving shaft (32) is pivotally matched with the avoidance hole (23), and is adapted to drive the shielding member (3) to rotate around the pivot axis (33) line between the shielding member (3) and the cover body (2) by driving the driving shaft (32). The central axis of the driving shaft (32) and the central axis of the conveying channel (22) are vertically arranged.

3. The top cover of a transportation container according to claim 2, characterized in that, A pivot axis (33) is provided on the outer peripheral wall of the shielding member (3). Along the second direction of the top cover (100), the pivot axis (33) and the driving shaft (32) are oppositely arranged, and the central axis of the pivot axis (33) and the central axis of the driving shaft (32) are coaxially arranged. A receiving hole (211) is provided on the inner wall of the pivoting space (21) opposite to the avoidance hole (23). The pivot axis (33) is pivotally and positioned in cooperation with the receiving hole (211).

4. The top cover of a transport container according to claim 1, characterized in that, The shielding member (3) defines a shielding space (34), the shielding space (34) being annularly arranged outside the communication hole (31). A first isolation member (341) and a plurality of second isolation members (342) are provided in the shielding space (34). The plurality of second isolation members (342) are sequentially arranged along the circumferential direction of the top cover (100), and the plurality of second isolation members (342) are annularly arranged outside the communication hole (31). The first isolation member (341) covers the outside of the plurality of second isolation members (342). Both the first isolation member (341) and the second isolation members (342) are used for isolating nuclear radiation.

5. The top cover of a transport container according to claim 1, characterized in that, The locking member (4) is provided at an end of the conveying channel (22) away from the accommodating space (11), and the locking member (4) is detachably connected to the cover body (2). A locking portion (41) is provided on an end wall of the locking member (4) close to the conveying channel (22). A locking hole (35) is provided on an outer peripheral wall of the shielding member (3). The locking hole (35) is adapted to be disposed opposite to the locking portion (41). The shielding member (3) is locked or unlocked by the locking portion (41) extending into or out of the locking hole (35).

6. The top cover of a transport container according to claim 5, characterized in that, Further included are: A first sealing cover (5). A receiving groove (24) is provided on an end wall of the cover body (2) close to the locking member (4). The receiving groove (24) communicates with the conveying channel (22). The locking member (4) is disposed in the receiving groove (24). A plurality of first sealing rings (42) are clamped between the locking member (4) and a bottom wall of the receiving groove (24). The plurality of first sealing rings (42) are spaced apart along a radial direction of the top cover (100). A first detection gap (43) is defined between any two adjacent first sealing rings (42). A first detection hole (44) is provided on the locking member (4). The first detection hole (44) is opposite to and communicates with one of the plurality of first detection gaps (43). The first detection hole (44) is used to detect whether there is a leakage marking medium in the first detection gap (43). The first sealing cover (5) is detachably mounted on the first detection hole (44).

7. A top cover of a transport container according to claim 1, characterized in that, Further included are: A closing member (6). The cover body (2) defines a gas conveying channel (25). One end of the gas conveying channel (25) forms a gas outlet hole (251) on an end wall of the cover body (2) away from the transportation container (1). The other end of the gas conveying channel (25) communicates with the conveying channel (22). And a connection portion between the gas conveying channel (25) and the conveying channel (22) is located on a side of the shielding member (3) close to the transportation container (1). An inflation member (252) is provided in the gas conveying channel (25). The inflation member (252) is adapted to communicate with an air pump. The air pump injects gas into the transportation container (1) through the inflation member (252). The closing member (6) is detachably mounted on the gas outlet hole (251), and the closing member (6) is in sealing cooperation with the gas outlet hole (251).

8. The top cover of a transport container according to claim 7, characterized in that, Further included are: A second sealing cover (7), a plurality of second sealing rings (61) are clamped between the closing member (6) and the bottom wall of the air inlet hole (251). The plurality of second sealing rings (61) are arranged at intervals in the radial direction of the top cover (100). A second detection gap (62) is defined between any two adjacent second sealing rings (61). The closing member (6) is provided with a second detection hole (63). The second detection hole (63) is opposite to and communicated with one of the plurality of second detection gaps (62). The second detection hole (63) is used to detect whether there is a leakage marking medium in the second detection gap (62). The second sealing cover (7) is detachably mounted on the second detection hole (63).

9. The top cover of a transport container according to claim 1, characterized in that, Further comprising: A third sealing cover (8), a limiting portion (26) is annularly arranged on the outer peripheral wall of the cover body (2). The limiting portion (26) is adapted to be in limiting cooperation with the end wall of the transportation container (1) close to the top cover (100). A plurality of third sealing rings (261) are clamped between the limiting portion (26) and the end wall of the transportation container (1) close to the top cover (100). The plurality of third sealing rings (261) are arranged at intervals in the radial direction of the top cover (100). A third detection gap (262) is defined between any two adjacent third sealing rings (261). The limiting portion (26) is provided with a third detection hole (263). The third detection hole (263) is opposite to and communicated with one of the plurality of third detection gaps (262). The third detection hole (263) is used to detect whether there is a leakage marking medium in the third detection gap (262). The third sealing cover (8) is detachably mounted on the third detection hole (263).

10. A container, characterized in that, Comprising: A transportation container (1), the transportation container (1) defines an accommodation space (11). The accommodation space (11) forms an open mouth (12) at the end of the transportation container (1). The accommodation space (11) is used to accommodate nuclear spent fuel rods; A top cover (100), the top cover (100) is arranged at the open mouth (12) of the container (200). The top cover (100) is used to open or close the accommodation space (11). The top cover (100) is the top cover (100) of a transportation container (1) according to any one of claims 1-9.

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