Offsite transport container for plutonium dioxide powder product cups

Abstract

The application discloses an off-site transportation container for plutonium dioxide powder product cups, which comprises an outer container, a shock absorber, an inner container and a holder, the inner container is arranged in the outer container, the shock absorber is arranged between the inner wall of the outer container and the outer wall of the inner container, and the holder is arranged in the inner container, the inner wall of the body of the outer container is filled with heat insulation material, the shock absorber is used for buffering the vibration of the inner container, the inner wall of the body of the inner container is filled with a shielding neutron poison, and the holder is used for supporting and limiting a plutonium dioxide powder product cup hanger. The technical scheme of the application can effectively reduce the influence of vibration and thermal shock in the transportation process on the plutonium dioxide powder product cups in the container, the shock absorption performance and the heat insulation effect are good, the product transportation requirements are met, and the safe transportation of radioactive substances is ensured.

Description

Technical Field

[0001] This invention belongs to the field of off-site transportation technology of radioactive nuclear fuel materials, specifically relating to an off-site transportation container for plutonium dioxide powder product cups. Background Technology

[0002] In response to the requirements for the safe transportation of radioactive materials, the transportation of plutonium dioxide powder products needs to meet the following conditions: no accidents should occur during normal transportation. Under normal transportation conditions, it should withstand water spray, free fall, accumulation and penetration tests. Under transportation accident conditions, it should withstand mechanical, heat resistance and water immersion tests. The requirements for the sealing performance, shock absorption performance and heat insulation performance of the transportation container are high. At present, there is a lack of special transportation containers for plutonium dioxide powder products. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art by providing an off-site transport container for plutonium dioxide powder product cups, which has excellent sealing performance, shock absorption performance and heat insulation performance.

[0004] The technical solution adopted to solve the technical problem of the present invention is to provide an off-site transport container for plutonium dioxide powder product cups, comprising: an outer container, a shock absorber, an inner container, and a retainer. The inner container is disposed inside the outer container, the shock absorber is disposed between the inner wall of the outer container and the outer wall of the inner container, and the retainer is disposed inside the inner container. The inner wall of the outer container is filled with heat-insulating material, the shock absorber is used to buffer the vibration of the inner container, the inner wall of the inner container is filled with neutron poison for shielding, and the retainer is used to support the plutonium dioxide powder product cup hanger and limit its position.

[0005] Preferably, the outer container includes: an outer container body, a top cover, and a sealing gasket, with the top cover disposed on the outer container body and the sealing gasket disposed between the top cover and the outer container body, and the top cover and the outer container body being detachably connected.

[0006] Preferably, the top cover includes: a first cover plate, an annular plate, a sealing plate, and a stiffening plate. The annular plate is a plate that is closed along the circumference. The sealing plate is located at the bottom of the annular plate. The first cover plate is located at the top of the annular plate. The first cover plate, the annular plate, and the sealing plate form a closed cavity. The cavity of the top cover is filled with thermal insulation material. The stiffening plate is located on the first cover plate and has lifting holes for hoisting.

[0007] Preferably, the outer container body includes: a second cover plate, an outer shell, an inner shell, a support ring, and a reinforcing rib. The outer shell is disposed outside the inner shell, and both the outer shell and the inner shell have openings at their top ends. The outer shell and the inner shell are connected by the support ring, forming a first interlayer between the inner shell and the outer shell. The top end of the first interlayer is provided with a second cover plate, which is used to seal the first interlayer. The interior of the first interlayer is filled with thermal insulation material. The reinforcing rib is disposed on the top outer side of the outer shell. Both the outer shell and the reinforcing rib are provided with corresponding lifting holes for hoisting. The connection between the outer shell and the second cover plate, and the reinforcing rib, are provided with corresponding drainage holes for drainage.

[0008] Preferably, the shock absorber includes: an upper pad and a lower pad, the upper pad being located above the lower pad and positioned between the top cover of the outer container and the inner container, the top of the upper pad being provided with a handle for disassembling the upper pad during loading and unloading of materials, and the lower pad being positioned between the inner container and the outer container.

[0009] Preferably, the inner container includes: an inner container body, an inner cover, and an outer cover, with the inner cover and outer cover respectively disposed on the inner container body, and the outer cover located outside the inner cover.

[0010] Preferably, the inner container body includes: an outer shell, an inner cylinder, a third cover plate, and a heat-conducting ring plate for heat conduction. The outer shell is disposed outside the inner cylinder. Both the outer shell and the inner cylinder are open at the top. The outer shell and the inner cylinder are connected by the heat-conducting ring plate to form a second interlayer between the outer shell and the inner cylinder. The top of the second interlayer is provided with a third cover plate, which is used to seal the second interlayer. The second interlayer is filled with a neutron poison for shielding.

[0011] Preferably, the inner container body further includes: a lifting lug, which is disposed on the outside of the third cover plate and is used to lift the inner container.

[0012] Preferably, the inner container further includes: a first sealing element and a second sealing element, wherein the first sealing element is disposed between the inner cover and the inner container body, and the second sealing element is disposed between the outer cover and the inner container body, the first sealing element includes two first O-rings, and the second sealing element includes two second O-rings.

[0013] Preferably, the third cover plate has two stepped sealing surfaces, namely a first stepped sealing surface and a second stepped sealing surface. The first stepped sealing surface is closer to the inner cylinder than the second stepped sealing surface. The first stepped sealing surface is provided with two first sealing rings, and the second stepped sealing surface is provided with two second sealing rings. The two first sealing rings are used to install the two first O-rings of the first sealing element, and the two second sealing rings are used to install the two second O-rings of the second sealing element.

[0014] Preferably, the bottom of the inner cover is provided with a first sealing ring channel, the inner cover is disposed behind the inner container body, and the first sealing ring channel is located between two first sealing rings on the first step sealing surface where a first O-ring is installed;

[0015] The inner container also includes: a third O-ring; a first leak detection hole is provided on the back of the first sealing ring of the inner cover, the first leak detection hole is used for sealing test; a first plug is provided at the first leak detection hole, the first plug is connected to the first leak detection hole by thread, and the first plug seals the first leak detection hole by pressing the third O-ring.

[0016] Preferably, the bottom of the outer cover is provided with a second sealing ring channel, the outer cover is located behind the inner container body, and the second sealing ring channel is located between two second sealing rings on the second step sealing surface where a second O-ring is installed;

[0017] The inner container also includes: a fourth O-ring; a second leak detection hole is provided on the back of the second sealing ring of the outer cover, which is used for sealing test; a second plug is provided at the second leak detection hole, which is connected to the second leak detection hole by threads, and the second plug seals the second leak detection hole by pressing the fourth O-ring.

[0018] Preferably, the inner cover and the outer cover are provided with threaded holes on the top for installing eye bolts.

[0019] Preferably, the inner cover includes: an inner cover body, a cavity disposed at the bottom of the inner cover body, and a shock-absorbing block, wherein the cavity is filled with neutron shielding material;

[0020] The shock-absorbing block is located at the bottom of the chamber and is used to press the plutonium dioxide powder product cup hanger to prevent axial movement during transportation.

[0021] Preferably, the retainer is embedded inside the inner container, and the upper part of the retainer has a through hole on the inner side of the circumference, which is connected to the inner container by bolts;

[0022] The top of the cage is equipped with a cushioning element for shock absorption between the cage and the plutonium dioxide powder product cup holder.

[0023] The upper inner wall of the cage is provided with two sealing rings with O-rings, which provide circumferential buffering and limiting of the plutonium dioxide powder product cup hanger.

[0024] The advantages of the off-site transport container for plutonium dioxide powder product cups in this invention

[0025] The effect is:

[0026] When transporting plutonium dioxide powder product cups off-site, under normal transportation conditions without any unexpected events, the containers withstand water spray, free fall, stacking, and penetration tests under normal transportation conditions. Under accident conditions, they withstand mechanical, heat resistance, and water immersion tests. The sealing, shock absorption, and thermal insulation performance of the transport containers are excellent. The technical solution of this invention can effectively reduce the impact of vibration and thermal shock during transportation on the plutonium dioxide powder product cups inside the containers. It provides good shock absorption and thermal insulation, meets product transportation requirements, and ensures the safe transportation of radioactive materials. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the off-site transport container for plutonium dioxide powder product cups in Embodiment 2 of the present invention;

[0028] Figure 2 for Figure 1 Schematic diagrams of containers from China and abroad;

[0029] Figure 3 for Figure 1 Schematic diagram of the intermediate shock absorber;

[0030] Figure 4 for Figure 1 A schematic diagram of the inner container and the cage;

[0031] Figure 5 This is a schematic diagram of the outer and inner lids of the inner container.

[0032] In the diagram: 1-Outer container, 11-Top cover, 111-First cover plate, 112-Ring plate, 113-Sealing plate, 114-Insulation material, 115-Firming plate, 116-Lifting hole, 12-Outer container body, 121-Second cover plate, 122-Outer shell, 123-Inner shell, 124-Support ring, 125-Insulation material, 126-Reinforcing rib, 127-Annular lifting hole, 128-Drain hole, 2-Shock absorber, 21-Upper pad, 211-Handle, 22-Lower pad, 3-Inner container, 31-Inner container body, 311-Outer shell, 312-Inner cylinder, 313-Third cover plate, 314-Heat-conducting ring plate, 315-Neutron poison, 316-Lifting lug, 3171- First step sealing surface, 3172-Second step sealing surface, 3181-First sealing ring, 3182-Second sealing ring, 3191-First O-ring, 3192-Second O-ring, 32-Outer cover, 321-Threaded hole, 322-Second plug, 323-Fourth O-ring, 3241-Second leak detection hole, 3242-Second sealing ring channel, 33-Inner cover, 331-Threaded hole, 332-First plug, 333-Third O-ring, 3341-First sealing ring channel, 3342-First leak detection hole, 335-Cavity, 336-Shock absorber, 4-Cage, 41-Buffer, 42-O-ring, 43-Sealing ring, 5-Product cup, 6-Product cup hanger. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0035] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0036] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0037] Example 1

[0038] This embodiment provides an off-site transport container for plutonium dioxide powder product cups, comprising: an outer container, a shock absorber, an inner container, and a retainer. The inner container is disposed within the outer container, the shock absorber is disposed between the inner wall of the outer container and the outer wall of the inner container, and the retainer is disposed within the inner container. The inner wall of the outer container is filled with thermal insulation material. The shock absorber is used to buffer the vibration of the inner container. The inner wall of the inner container is filled with neutron poison for shielding. The retainer is used to support and limit the movement of the plutonium dioxide powder product cup hanger.

[0039] The beneficial effects of the off-site transport container for plutonium dioxide powder product cups in this embodiment are as follows:

[0040] When transporting plutonium dioxide powder product cups off-site, under normal transportation conditions without any unexpected events, the containers withstand water spray, free fall, stacking, and penetration tests under normal transportation conditions. Under accident conditions, they withstand mechanical, heat resistance, and water immersion tests. The sealing, shock absorption, and thermal insulation performance of the transport containers are excellent. The technical solution of this embodiment effectively reduces the impact of vibration and thermal shock during transportation on the plutonium dioxide powder product cups inside the containers. It provides good shock absorption and thermal insulation, meets product transportation requirements, and ensures the safe transportation of radioactive materials.

[0041] Example 2

[0042] like Figures 1-5 As shown, this embodiment provides an off-site transport container for plutonium dioxide powder product cups, including: an outer container 1, a shock absorber 2, an inner container 3, and a retainer 4. The inner container 3 is disposed inside the outer container 1, the shock absorber 2 is disposed between the inner wall of the outer container 1 and the outer wall of the inner container 3, and the retainer 4 is disposed inside the inner container 3. The inner wall of the outer container 1 is filled with thermal insulation material, the shock absorber 2 is used for vibration buffering of the inner container 3, the inner wall of the inner container 3 is filled with neutron poison for shielding, and the retainer 4 is used to support and limit the movement of the plutonium dioxide powder product cup hanger 6.

[0043] The outer container 1 is filled with insulation material, forming the first layer of protection for heat insulation and buffering; the shock absorber 2 is located between the outer container 1 and the inner container 3, realizing vibration buffering of the inner container 3 during transportation.

[0044] like Figure 2 As shown, preferably, the outer container 1 includes: an outer container body 12, a top cover 11, and a sealing gasket 13. The top cover 11 is disposed on the outer container body 12, and the sealing gasket 13 is disposed between the top cover 11 and the outer container body 12. The top cover 11 and the outer container body 12 are detachably connected. The top cover 11 and the outer container body 12 are fastened together by bolts 14.

[0045] Preferably, the top cover 11 includes: a first cover plate 111, an annular plate 112, a sealing plate 113, and a stiffening plate 115. The annular plate 112 is a plate that is closed along the circumference. The sealing plate 113 is disposed at the bottom of the annular plate 112. The first cover plate 111 is disposed at the top of the annular plate 112. The first cover plate 111, the annular plate 112, and the sealing plate 113 form a closed cavity. The cavity of the top cover 11 is filled with thermal insulation material 114. The stiffening plate 115 is disposed on the first cover plate 111, and the stiffening plate 115 has a lifting hole 116 for hoisting.

[0046] Specifically, in this embodiment, the first cover plate 111 is a flange.

[0047] Preferably, the outer container body 12 includes: a second cover plate 121, an outer shell 122, an inner shell 123, a support ring 124, and a reinforcing rib 126. The outer shell 122 is disposed outside the inner shell 123. Both the outer shell 122 and the inner shell 123 have openings at their top ends. The outer shell 122 and the inner shell 123 are connected by the support ring 124, forming a first interlayer between the inner shell 123 and the outer shell 122. The second cover plate 121 is disposed at the top end of the first interlayer and is used to seal the first interlayer. The interior of the first interlayer is filled with thermal insulation material 125. The reinforcing rib 126 is disposed on the top outer side of the outer shell 122. Both the outer shell 122 and the reinforcing rib 126 are provided with corresponding through-holes 127 for hoisting. The connection between the outer shell 122 and the second cover plate 121, and the reinforcing rib 126 are provided with corresponding through-holes 128 for drainage.

[0048] Specifically, three support rings 124 are welded between the shells, the first interlayer is a sealed cavity, a reinforcing rib 126 is welded around the top outer side of the outer shell 122, and four annular lifting holes 127 are evenly distributed around the circumference. Four drainage holes 128 that penetrate the reinforcing rib 126 are opened at the connection between the outer shell 122 and the second cover plate 121 for draining water or collecting water on the surface of the container.

[0049] Specifically, in this embodiment, the second cover plate 121 is a ring flange. The first cover plate and the second cover plate are connected by bolts.

[0050] like Figure 3As shown, preferably, the shock absorber 2 includes: an upper pad 21 and a lower pad 22. The upper pad 21 is located above the lower pad 22 and is located between the top cover 11 of the outer container 1 and the inner container 3. The top of the upper pad 21 is provided with a handle 211, which is used to disassemble the upper pad 21 during the loading and unloading of materials. The lower pad 22 is located between the inner container 3 and the outer container 1, which can effectively reduce the vibration between the two.

[0051] like Figures 4-5 As shown, preferably, the inner container 3 includes: an inner container body 31, an inner cover 33, and an outer cover 32. The inner cover 33 and the outer cover 32 are respectively disposed on the inner container body 31, and the outer cover 32 is located outside the inner cover 33.

[0052] The inner container 3 is filled with neutron poison 315 to achieve shielding protection for the product cup 5. It is also equipped with an inner cover 33 and an outer cover 32 to form two seals, effectively preventing leakage of the contents under abnormal operating conditions.

[0053] Preferably, the inner container body 31 includes: an outer shell 311, an inner cylinder 312, a third cover plate 313, and a heat-conducting ring plate 314 for heat conduction. The outer shell 311 is disposed outside the inner cylinder 312. Both the outer shell 311 and the inner cylinder 312 are open at their top ends. The outer shell 311 and the inner cylinder 312 are connected by the heat-conducting ring plate 314, forming a second interlayer between the outer shell 311 and the inner cylinder 312. The third cover plate 313 is disposed at the top end of the second interlayer, and the third cover plate 313 is used to seal the second interlayer. The second interlayer is filled with a neutron poison 315 for shielding. Specifically, the second interlayer is a sealed cavity.

[0054] Specifically, in this embodiment, the third cover plate 313 is a sealing flange. The third cover plate 313 forms a sealing structure with the threaded hole connection surfaces of the outer shell 311 and the inner cylinder 312 respectively, and is connected by bolts. Heat-conducting ring plates 314 of equal height are welded between the outer shell 311 and the inner cylinder 312.

[0055] Preferably, the inner container body 31 further includes a lifting lug 316, which is disposed on the outside of the third cover plate 313 and is used to lift the inner container 3.

[0056] Specifically, in this embodiment, two lifting lugs 316 are evenly welded to the outer side of the third cover plate 313.

[0057] Preferably, the inner container 3 further includes a first sealing element and a second sealing element. The first sealing element is disposed between the inner cover 33 and the inner container body 31, and the second sealing element is disposed between the outer cover 32 and the inner container body 31. The first sealing element includes two first O-rings 3191, and the second sealing element includes two second O-rings 3192. Both the outer cover 32 and the inner cover 33 are sealed to the inner container body 31 by double O-rings, forming a double-layer sealing barrier.

[0058] Preferably, the third cover plate 313 has two stepped sealing surfaces, namely a first stepped sealing surface 3171 and a second stepped sealing surface 3172. The first stepped sealing surface 3171 is closer to the inner cylinder 312 than the second stepped sealing surface 3172. The first stepped sealing surface 3171 is provided with two first sealing rings 3181, and the second stepped sealing surface 3172 is provided with two second sealing rings 3182. The two first sealing rings 3181 are used to install the two first O-rings 3191 of the first sealing element, and the two second sealing rings 3182 are used to install the two second O-rings 3192 of the second sealing element.

[0059] Preferably, the bottom of the inner cover 33 is provided with a first sealing ring channel 3342. The inner cover 33 is located behind the inner container body 31. The first sealing ring channel 3342 is located between two first sealing rings 3181 on the first step sealing surface 3171 where a first O-ring 3191 is installed.

[0060] The inner container 3 also includes: a third O-ring 333; a first leak detection hole 3341 is provided on the back of the first sealing ring channel 3342 of the inner cover 33, which is used for sealing test; a first plug 332 is provided at the first leak detection hole 3341, which is connected to the first leak detection hole 3341 by threads, and the first plug 332 seals the first leak detection hole 3341 by pressing the third O-ring 333.

[0061] Preferably, the bottom of the outer cover 32 is provided with a second sealing ring channel 3242. The outer cover 32 is located behind the inner container body 31. The second sealing ring channel 3242 is located between two second sealing rings 3182 on the second step sealing surface 3172 where a second O-ring 3192 is installed.

[0062] The inner container 3 also includes: a fourth O-ring 323; a second leak detection hole 3241 is provided on the back of the second sealing ring channel 3242 of the outer cover 32, which is used for sealing test; a second plug 322 is provided at the second leak detection hole 3241, which is connected to the second leak detection hole 3241 by threads, and the second plug 322 seals the second leak detection hole 3241 by pressing the fourth O-ring 323.

[0063] Preferably, the top of the outer cover 32 is provided with a threaded hole 321 for installing a lifting eye screw.

[0064] Preferably, the inner cover 33 includes: an inner cover body, a cavity 335 disposed at the bottom of the inner cover body, and a shock-absorbing block 336, wherein the cavity 335 is filled with neutron shielding material;

[0065] The shock absorber 336 is located at the lower part of the chamber 335. The shock absorber 336 is used to press the plutonium dioxide powder product cup hanger 6 to prevent axial runout during transportation.

[0066] Preferably, the top of the inner cover 33 is provided with a threaded hole 331 for installing a lifting eye screw.

[0067] Preferably, the retainer 4 is embedded inside the inner container 3, and the upper part of the retainer 4 has a through hole on the inner side of the circumference, which is connected to the inner container 3 by bolts; the bolts pass through the through hole to connect the retainer 4 to the inner container 3.

[0068] The top of the cage 4 is provided with a buffer 41, which is used to reduce shock between the cage 4 and the plutonium dioxide powder product cup hanger 6; specifically, the top of the cage 4 is attached with a buffer 41, which is a silicone gasket.

[0069] The upper inner wall of the retainer 4 is provided with two sealing rings 43 with O-rings 42, which provide circumferential buffering and limiting of the plutonium dioxide powder product cup hanger 6.

[0070] By adopting this solution, the plutonium dioxide powder product cup and hanger 6 can be transported off-site. The shielding, heat insulation, shock absorption, and sealing measures adopted can all meet the relevant legal and regulatory requirements for the safe transportation of radioactive materials.

[0071] In this embodiment, the off-site transport container for the plutonium dioxide powder product cup includes an outer container, a shock absorber, and an inner container. The outer container includes a top cover and an outer container body, with a sealing gasket between them, forming the first layer of protection. The outer container body includes an inner shell and an outer shell, with insulation material filling the space between the shells to reduce thermal shock. The top cover has a similar structure. The shock absorber includes an upper pad and a lower pad, located between the inner container and the outer container, for shock absorption of the inner container. The inner container includes an outer cover, an inner cover, and an inner container body. A double O-ring seal is provided between the outer cover, the inner cover, and the inner container body to form a double-layer gas seal, creating the sealed space required for storing the plutonium dioxide powder product cup and preventing aerosol leakage under abnormal operating conditions. The inner container body includes an outer shell and an inner cylinder, with neutron poison filling the space between them for shielding the contents. The inner and outer cover structures are similar.

[0072] The beneficial effects of the off-site transport container for plutonium dioxide powder product cups in this embodiment are as follows:

[0073] When transporting plutonium dioxide powder product cups off-site, under normal transportation conditions without any unexpected events, the containers withstand water spray, free fall, stacking, and penetration tests under normal transportation conditions. Under accident conditions, they withstand mechanical, heat resistance, and water immersion tests. The sealing, shock absorption, and thermal insulation performance of the transport containers are excellent. The technical solution of this embodiment effectively reduces the impact of vibration and thermal shock during transportation on the plutonium dioxide powder product cups inside the containers. It provides good shock absorption and thermal insulation, meets product transportation requirements, and ensures the safe transportation of radioactive materials.

[0074] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An off-site transport container for plutonium dioxide powder product cups, characterized in that, include: The outer container (1), shock absorber (2), inner container (3), and retainer (4) are arranged inside the outer container (1). The shock absorber (2) is arranged between the inner wall of the outer container (1) and the outer wall of the inner container (3). The retainer (4) is arranged inside the inner container (3). The inner wall of the outer container (1) is filled with heat-insulating material. The shock absorber (2) is used to buffer the vibration of the inner container (3). The inner wall of the inner container (3) is filled with neutron poison for shielding. The retainer (4) is used to support the plutonium dioxide powder product cup hanger and limit its position. The retainer (4) is embedded inside the inner container (3). The upper part of the retainer (4) has a through hole on the inner side of the circumference and is connected to the inner container (3) by bolts. The top of the frame of the retainer (4) is provided with a buffer (41) for shock absorption between the buffer (41) and the plutonium dioxide powder product cup hanger (6); The upper inner wall of the retainer (4) is provided with two sealing rings (43) with O-rings (42), which provide circumferential buffering and limiting of the plutonium dioxide powder product cup hanger (6) through the O-rings (42).

2. The off-site transport container for plutonium dioxide powder product cups according to claim 1, characterized in that, The outer container (1) includes: an outer container body (12), a top cover (11), and a sealing gasket (13). The top cover (11) is disposed on the outer container body (12), and the sealing gasket (13) is disposed between the top cover (11) and the outer container body (12). The top cover (11) and the outer container body (12) are detachably connected.

3. The off-site transport container for plutonium dioxide powder product cups according to claim 2, characterized in that, The top cover (11) includes: a first cover plate (111), an annular plate (112), a sealing plate (113), and a stiffening plate (115). The annular plate (112) is a plate that is closed along the circumference. The sealing plate (113) is located at the bottom of the annular plate (112). The first cover plate (111) is located at the top of the annular plate (112). The first cover plate (111), the annular plate (112), and the sealing plate (113) form a closed cavity. The cavity of the top cover (11) is filled with thermal insulation material (114). The stiffening plate (115) is located on the first cover plate (111). The stiffening plate (115) has a hoisting hole (116) for hoisting.

4. The off-site transport container for plutonium dioxide powder product cups according to claim 2, characterized in that, The outer container body (12) includes: a second cover plate (121), an outer shell (122), an inner shell (123), a support ring (124), and a reinforcing rib (126). The outer shell (122) is disposed outside the inner shell (123). Both the outer shell (122) and the inner shell (123) have openings at their top ends. The outer shell (122) and the inner shell (123) are connected by the support ring (124), forming a first interlayer between the inner shell (123) and the outer shell (122). The top end of the first interlayer is provided with... A second cover plate (121) is provided to seal the first interlayer. The first interlayer is filled with thermal insulation material (125). A reinforcing rib (126) is provided on the top outer side of the outer shell (122). The outer shell (122) and the reinforcing rib (126) are provided with corresponding lifting holes (127) for hoisting. The connection between the outer shell (122) and the second cover plate (121) and the reinforcing rib (126) are provided with corresponding drainage holes (128) for drainage.

5. The off-site transport container for plutonium dioxide powder product cups according to claim 2, characterized in that, The shock absorber (2) includes: an upper pad (21) and a lower pad (22). The upper pad (21) is located above the lower pad (22). The upper pad (21) is located between the top cover (11) of the outer container (1) and the inner container (3). The top of the upper pad (21) is provided with a handle (211). The handle (211) is used to disassemble the upper pad (21) during the loading and unloading of materials. The lower pad (22) is located between the inner container (3) and the outer container (1).

6. The off-site transport container for plutonium dioxide powder product cups according to claim 1, characterized in that, The inner container (3) includes: inner container body (31), inner cover (33), and outer cover (32). The inner cover (33) and outer cover (32) are respectively disposed on the inner container body (31), and the outer cover (32) is located outside the inner cover (33).

7. The off-site transport container for plutonium dioxide powder product cups according to claim 6, characterized in that, The inner container body (31) includes: an outer shell (311), an inner cylinder (312), a third cover plate (313), and a heat-conducting ring plate (314) for heat conduction. The outer shell (311) is disposed outside the inner cylinder (312). Both the outer shell (311) and the inner cylinder (312) are open at the top. The outer shell (311) and the inner cylinder (312) are connected by the heat-conducting ring plate (314). A second interlayer is formed between the outer shell (311) and the inner cylinder (312). The third cover plate (313) is disposed at the top of the second interlayer. The third cover plate (313) is used to seal the second interlayer. The second interlayer is filled with a neutron poison (315) for shielding.

8. The off-site transport container for plutonium dioxide powder product cups according to claim 7, characterized in that, The inner container body (31) also includes a lifting lug (316), which is located on the outside of the third cover plate (313) and is used to lift the inner container (3).

9. The off-site transport container for plutonium dioxide powder product cups according to claim 7, characterized in that, The inner container (3) also includes: a first seal and a second seal. The first seal is disposed between the inner cover (33) and the inner container body (31), and the second seal is disposed between the outer cover (32) and the inner container body (31). The first seal includes two first O-rings (3191), and the second seal includes two second O-rings (3192).

10. The off-site transport container for plutonium dioxide powder product cups according to claim 9, characterized in that, The third cover plate (313) has two stepped sealing surfaces, namely the first stepped sealing surface (3171) and the second stepped sealing surface (3172). The first stepped sealing surface (3171) is closer to the inner cylinder (312) than the second stepped sealing surface (3172). The first stepped sealing surface (3171) is provided with two first sealing rings (3181), and the second stepped sealing surface (3172) is provided with two second sealing rings (3182). The two first sealing rings (3181) are used to install the two first O-rings (3191) of the first sealing element, and the two second sealing rings (3182) are used to install the two second O-rings (3192) of the second sealing element.

11. The off-site transport container for plutonium dioxide powder product cups according to claim 10, characterized in that, The bottom of the inner cover (33) is provided with a first sealing ring channel (3341). The inner cover (33) is located behind the inner container body (31). The first sealing ring channel (3341) is located between two first sealing rings (3181) on the first step sealing surface (3171) where a first O-ring (3191) is installed. The inner container (3) also includes: a third O-ring (333); a first leak detection hole (3342) is provided on the back of the first sealing ring channel (3341) of the inner cover (33); the first leak detection hole (3342) is used for sealing test; a first plug (332) is provided at the first leak detection hole (3342); the first plug (332) is connected to the first leak detection hole (3342) by thread; the first plug (332) seals the first leak detection hole (3342) by pressing the third O-ring (333).

12. The off-site transport container for plutonium dioxide powder product cups according to claim 10, characterized in that, The bottom of the outer cover (32) is provided with a second sealing ring channel (3242). The outer cover (32) is located behind the inner container body (31). The second sealing ring channel (3242) is located between two second sealing rings (3182) on the second step sealing surface (3172) where a second O-ring (3192) is installed. The inner container (3) also includes: a fourth O-ring (323); a second leak detection hole (3241) is provided on the back of the second sealing ring channel (3242) of the outer cover (32); the second leak detection hole (3241) is used for sealing test; a second plug (322) is provided at the second leak detection hole (3241); the second plug (322) is connected to the second leak detection hole (3241) by thread; the second plug (322) seals the second leak detection hole (3241) by pressing the fourth O-ring (323).

13. The off-site transport container for plutonium dioxide powder product cups according to claim 6, characterized in that, The top of the outer cover (32) is provided with a threaded hole (321) for installing eye bolts.

14. The off-site transport container for plutonium dioxide powder product cups according to claim 6, characterized in that, The inner cover (33) includes: an inner cover body, a cavity (335) disposed at the bottom of the inner cover body, and a shock-absorbing block (336). The cavity (335) is filled with neutron shielding material. The shock absorber (336) is located at the lower part of the chamber (335) and is used to press the plutonium dioxide powder product cup hanger (6).

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