Transportation container for micro-reactor new fuel elements and loading and unloading method of transportation container

Abstract

The invention relates to a transportation container for micro-reactor new fuel elements and a loading and unloading method thereof.The transportation container comprises an outer barrel, an inner barrel and an outer cover, the outer barrel and the inner barrel are coaxially arranged to form a double-layer heat insulation structure, a first interlayer of the outer barrel is filled with heat insulation materials, a second interlayer of the inner barrel is filled with air, and double fireproof heat insulation protection is constructed; due to the three-layer sealing design of the outer cover, the first inner cover and the second inner cover, the air tightness is further improved, leakage of the fuel element is prevented, and critical safety is ensured; the container is of a multi-rib-plate and shock absorber structure, the first rib plate, the third rib plate and the second rib plate improve the strength of the barrel and the strength of the outer cover respectively, the shock absorber further enhances the anti-seismic property, and transportation safety is guaranteed. The base is combined with the symmetrical check blocks, the positioning pins and the reinforcers, so that the stability and the bearing capacity of the container are enhanced. The invention further provides a simple, convenient, efficient and safe loading and unloading method which can be widely applied to transportation and storage of micro-reactor fuel elements.

Description

Technical Field

[0001] The invention relates to the field of nuclear fuel assembly transportation equipment, and in particular to a transportation container for new fuel elements of a micro-reactor and a loading and unloading method thereof. Background Art

[0002] Micro neutron source reactors (micro reactors) are widely used in nuclear medicine, scientific research and other fields due to their advantages such as low power, easy operation, high safety, clean and environmental protection. With the continuous development of nuclear energy sharing, the transportation demand for micro reactor fuel elements has gradually increased, and the mode of transportation has also expanded from traditional road and rail transportation to air transportation. However, since micro reactor fuel elements are fissile materials, there are criticality safety risks in their transportation process. At the same time, the thermal insulation requirements of high temperature environments must be met during transportation. Therefore, it is particularly important to develop a transport container with excellent thermal insulation effect and easy operation.

[0003] At present, a variety of radioactive material transport containers have been used in actual transportation. For example, a patent application with publication number CN117711656A discloses a new fuel assembly transport container, which forms a storage space by combining an upper shell and a lower shell. A shock-absorbing bed is provided in the storage space to stabilize the fuel assembly. Although this design has a certain shock-absorbing effect, it is still insufficient in terms of thermal insulation performance and critical safety under air transportation conditions. A patent application with publication number CN112735622A discloses a new fuel single-assembly transport container, which adopts a multi-layer structure of an outer shell, a flexible shell and an inner shell, and is combined with critical safety devices such as a moderator body and a neutron absorption material layer. Although this design improves transportation safety to a certain extent, the overall structure of the outer shell is complex, the operation is not simple enough, and the thermal insulation performance still needs to be optimized.

[0004] At present, domestic micro-reactor fuel transport containers are mainly designed for road and rail transportation, and do not fully meet the special safety requirements of air transportation. Especially under the conditions of air transportation accidents, existing containers are difficult to fully guarantee the subcritical safety performance of cargo packages. Therefore, there is an urgent need for a micro-reactor fuel element transport container that can be used for road, rail, water and air transportation to fill the domestic technical gap.

[0005] In view of the above problems, the present invention is proposed. Summary of the invention

[0006] The invention discloses a transport container for a new fuel element of a micro-reactor and a loading and unloading method thereof, aiming to solve the technical problems existing in the prior art.

[0007] According to one aspect of the present invention, a transport container for new fuel elements of a micro-reactor is provided, comprising an outer cylinder, an inner cylinder and an outer cover, wherein the outer cylinder and the inner cylinder have the same axis, and the outer cylinder is arranged outside the inner cylinder; the outer cover is arranged above the inner cylinder along the axial direction, and the outer periphery of the outer cover is adjacent to the inner side of the top of the outer cylinder;

[0008] The outer cylinder is provided with a first outer wall, a first inner wall, a first rib plate and at least one shock absorber. The first inner wall is located inside the first outer wall and forms a first interlayer with the first outer wall. The first interlayer is filled with a heat insulating material to form a first heat insulating layer. The first rib plate is arranged in the first heat insulating layer and is parallel to the first outer wall and the first inner wall to increase the strength. The shock absorber is sleeved on the top of the outer cylinder, respectively covering a part of the top surface of the outer cylinder and the outer wall close to the top surface.

[0009] The inner cylinder is provided with an inner cylinder body, and the inner cylinder body is provided with a second outer wall, a second inner wall and a third rib plate, the second inner wall is located on the inner side of the second outer wall, and forms a second interlayer with the second outer wall, the second interlayer is filled with air to form a second heat insulation layer, and the third rib plate is arranged in the second heat insulation layer and is parallel to the second outer wall and the second inner wall to increase strength; the inner cylinder is also provided with a first inner cover and a second inner cover, and the first inner cover is located above the second inner cover in the axial direction for sealing;

[0010] The outer cover is provided with an outer cover body for sealing;

[0011] The outer cover body is axially arranged above the first inner cover, and the outer cover body, the first inner cover and the second inner cover form a three-layer sealing structure to prevent critical safety problems of the transport container.

[0012] As a preferred technical solution, there are two shock absorbers, which together form an arc with two notches on the outer wall of the outer cylinder, and the straight line direction of the two notches passes through the center of the cross section of the top of the outer cylinder.

[0013] As a preferred technical solution, the outer cover is also provided with an annular plate, which is arranged below the outer cover body to form a stepped cover structure with the outer cover body, and the cross-sectional radius of the outer cover body is larger than the cross-sectional radius of the annular plate; the outer cylinder is also provided with at least one first flange, which is welded and fixed to the inner side of the shock absorber, and the first flange is arranged into a double-layer stepped structure, and the double-layer stepped structure matches the stepped cover structure.

[0014] As a preferred technical solution, the number of the first flanges is the same as the number of the shock absorbers.

[0015] As a preferred technical solution, it also includes a base, which is located axially below the outer cylinder and connected to the bottom of the outer cylinder.

[0016] As a preferred technical solution, the base includes a base body and a plurality of stoppers. The base body is provided with a circular concave platform matching the cross section of the outer cylinder, and the plurality of stoppers are evenly distributed along the edge of the circular concave platform.

[0017] As a preferred technical solution, a plurality of positioning pins, bolt columns and nuts are provided on the inner side of the edge of the circular concave platform, and the positioning pins are arranged adjacent to the bolt columns and nuts.

[0018] As a preferred technical solution, the outer cover is further provided with at least one second rib plate, and the second rib plate is distributed along the diameter direction of the top surface of the outer cover.

[0019] As a preferred technical solution, the number of the second ribs is 2.

[0020] As a preferred technical solution, the two second ribs intersect and are distributed vertically.

[0021] As a preferred technical solution, the inner cylinder body is also provided with a second flange, which is arranged as a double-layer stepped structure, including a first step and a second step, wherein the second step is arranged away from the top of the inner cylinder body and is provided with a double O-ring sealing groove.

[0022] As a preferred technical solution, it also includes a foam cylinder, which is arranged inside the inner cylinder and has the same axis as the inner cylinder and the outer cylinder.

[0023] As a preferred technical solution, the foam tube is provided with a foam tube cover and a foam tube body, the foam tube body is provided with a plurality of first square grooves, and the foam tube cover is correspondingly provided with the same number of second square grooves, and the distribution positions of the first square grooves and the second square grooves match each other.

[0024] According to another aspect of the present invention, a method for loading and unloading the above-mentioned transport container for new fuel elements of a micro-reactor is provided, comprising:

[0025] Remove the outer cover, the first inner cover, and the second inner cover in sequence;

[0026] Remove the foam cylinder cover, and when loading, load the new fuel elements of the micro-pile into the multiple first square grooves of the foam cylinder body in sequence; when unloading, take out the new fuel elements of the micro-pile in sequence and place them at the designated location;

[0027] The foam cylinder cover, the second inner cover, the first inner cover and the outer cover are installed in sequence to complete the loading or unloading.

[0028] The technical solution adopted by the present invention can achieve at least one of the following beneficial effects:

[0029] 1. The present invention adopts a multi-layer protection design, which significantly improves the safety, thermal insulation and sealing of the transport container under high temperature, vibration and accident conditions, including an outer cylinder body adopting a sandwich structure between a first outer wall and a first inner wall, and filling it with thermal insulation materials, which effectively improves the fireproof and thermal insulation capabilities of the container and protects the safety of the internal contents under high temperature or accident conditions; the inner cylinder body adopts a sandwich design of a second outer wall and a second inner wall, and fills air in the sandwich to form a second thermal insulation layer through air isolation, further improving the fireproof performance; the three-layer sealing of the outer cover body, the first inner cover and the second inner cover significantly improves the airtightness and safety of the transport container, prevents leakage of fuel elements, and ensures critical safety.

[0030] 2. The present invention adopts a high-strength rib plate structure and a shock absorber. The first rib plate is arranged in parallel in the interlayer between the first outer wall and the first inner wall, which significantly improves the structural strength of the cylinder and ensures that the container is not easily deformed during transportation or storage; the third rib plate is parallel to the interlayer between the second outer wall and the second inner wall; the outer cover is also provided with a second rib plate; and the shock absorber is arranged at the top of the outer cylinder. The combination of the rib plate structure and the shock absorber improves the mechanical strength and anti-seismic ability of the container and ensures transportation safety.

[0031] 3. The interior of the foam tube of the present invention is designed with an array structure of outer circle and inner square, and the plurality of first square grooves correspond one-to-one with the second square grooves on the foam tube cover, which facilitates the rapid loading and unloading of the fuel elements and improves the operating efficiency.

[0032] 4. The base of the present invention is combined with symmetrical blocks, positioning pins and reinforcements to enhance the stability and carrying capacity of the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions explain the present invention and do not constitute improper limitations on the present invention. In the drawings:

[0034] Figure 1 It is a three-dimensional schematic diagram of a transport container for new fuel elements of a micro-reactor according to the present invention;

[0035] Figure 2 This is a schematic diagram of the main structure of a transport container for new fuel elements of a micro-reactor according to the present invention;

[0036] Figure 3 It is a top view of the structure of a transport container for new fuel elements of a micro-reactor according to the present invention;

[0037] Figure 4 It is a schematic diagram of the main structure of the inner cylinder of the present invention;

[0038] Figure 5 It is a schematic diagram of the main structure of the foam tube of the present invention;

[0039] Figure 6 It is a three-dimensional schematic diagram of the base of the present invention.

[0040] Description of reference numerals:

[0041] 1. Outer cylinder; 11. First flange; 12. First outer wall; 13. First inner wall; 14. Reinforcement; 15. First bottom plate; 16. Lifting ear; 17. First rib plate; 18. Shock absorber; 2. Outer cover; 21. Outer cover body; 22. Insulation cotton; 23. Rubber pad; 24. Second bottom plate; 25. Second rib plate; 26. Ring plate; 3. Inner cylinder; 31. First inner cover; 32. Second inner cover; 33. Inner cylinder body; 331. Second flange; 332. Second inner wall; 333. Third rib plate; 334. Second outer wall; 335. Third bottom plate; 4. Foam cylinder; 41. Foam cylinder cover; 42. Foam cylinder body; 5. Base; 51. Base body; 52. Block; 53. Positioning pin; 54. Bolt column; 55. Nut. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0044] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In order to solve the problems existing in the prior art, the embodiment of the present invention provides a transport container for new fuel elements of a micro reactor, and in particular, relates to a vertical transport container, such as Figure 1-Figure 6As shown, it includes an outer cylinder 1, an outer cover 2, an inner cylinder 3, a foam cylinder 4 and a base 5. The outer cylinder 1 is the outermost structure of the transport container, and mainly plays the role of structural support, protective barrier, heat insulation, radiation shielding, etc. Figure 1 and Figure 2 As shown, the base 5 is arranged at the bottom of the outer cylinder 1, forming a support platform of the transport container, providing a stable support, ensuring that the transport container always maintains stability during loading, transportation and unloading, and preventing displacement or damage of the fuel elements due to tilting or shaking. Figure 2 The direction of the transport container shown in the use state is taken as the standard. The outer cover 2, the inner cylinder 3, and the foam cylinder 4 are all arranged on the inner side of the outer cylinder 1. The foam cylinder 4 is arranged on the inner side of the inner cylinder 3 and the two have the same axis. The outer cylinder 1 is arranged adjacent to the outer side of the inner cylinder 3, and the axis of the outer cylinder 1 is the same as that of the inner cylinder 3 and the foam cylinder 4. The outer cover 2 is arranged above the inner cylinder 3 along the axial direction of the inner cylinder 3, and the outer side of the outer cover 2 is adjacent to the inner side of the top of the outer cylinder 1. The foam cylinder 4 is used to wrap the new fuel element of the micro-reactor. As a key buffer and protection component, it provides reliable buffering and protection, and improves the safety, adaptability and practicality of the transport container.

[0046] like Figure 1 and Figure 2 As shown, the outer cylinder 1 includes a first outer wall 12, a first inner wall 13, a first rib plate 17 and a shock absorber 18. The first outer wall 12 is in contact with the outside world, and the first inner wall 13 is arranged on the inner side of the first outer wall 12 to form a first sandwich structure with the first outer wall 12. Preferably, an aluminum silicate wool blanket is filled between the first outer wall 12 and the first inner wall 13 to form a first thermal insulation layer, which plays a thermal insulation role and effectively reduces the inward transfer of heat under fire accident conditions. A first rib plate 17 is also arranged between the first outer wall 12 and the first inner wall 13. The first rib plate 17 is surrounded by the thermal insulation layer to increase the overall strength of the outer cylinder 1. In order to better increase the strength of the outer cylinder 1, preferably, Figure 2 The direction of the transport container shown in the use state is taken as the standard, and the first rib plate 17 is arranged in the vertical direction, and the first rib plate 17 is arranged parallel to the first outer wall 12 and the first inner wall 13. At least one shock absorber 18 is arranged on the top of the outer cylinder 1 for mechanical shock absorption. Preferably, two shock absorbers 18 are arranged on the top of the outer cylinder 1, and the two shock absorbers 18 are sleeved on the top of the outer cylinder 1, respectively covering a part of the outer wall of the outer cylinder 1 close to the top and a part of the top end face of the outer cylinder 1; the two shock absorbers 18 together form an arc with two notches on the outer wall of the outer cylinder 1, and the straight line direction where the two notches are located passes through the center of the cross section of the top of the outer cylinder 1; the parts of the top end face of the outer cylinder 1 covered by the two shock absorbers 18 together form a circular ring with two notches, and the above circular ring covers a part of the top end face of the outer cylinder 1.

[0047] like Figure 4 As shown, the inner cylinder 3 is provided with a first inner cover 31 and a second inner cover 32. Figure 2 As shown, the outer cover 2 is provided with an outer cover body 21, a second inner cover 32, a first inner cover 31 and an outer cover body 21 having the same axis, and the second inner cover 32 is arranged immediately below the first inner cover 31, and the outer cover body 21 is arranged above the first inner cover 31, with one part directly contacting the outside, and the other part connected to the shock absorber 18. The second inner cover 32, the first inner cover 31 and the outer cover body 21 form a three-layer sealing cover structure of the transport container to prevent the critical safety problem of the transport container, that is, to prevent the new fuel element of the micro-reactor from reaching the critical state of spontaneous nuclear fission under any transport state, thereby avoiding radioactive accidents.

[0048] like Figure 4 As shown, the inner cylinder 3 is also provided with an inner cylinder body 33, and the inner cylinder body 33 includes a second inner wall 332, a second outer wall 334 and a third rib plate 333. The second inner wall 332 is arranged on the inner side of the second outer wall 334, and forms a second sandwich structure together with the second outer wall 334. The second sandwich structure between the second inner wall 332 and the second outer wall 334 is filled with air to form a second heat insulation layer, which is insulated by air; the third rib plate 333 is arranged in the second sandwich structure between the second inner wall 332 and the second outer wall 334, and is parallel to the second inner wall 332 and the second outer wall 334 to increase the strength of the inner cylinder body 33.

[0049] In actual use of the transport container, the outer cylinder 1 provides structural support and insulation through the sandwich structure between the first inner wall 13 and the first outer wall 12, the first rib plate 17 arranged in the sandwich structure and the aluminum silicate wool blanket insulation layer filled in the sandwich structure; a shock absorber is sleeved on the top of the outer cylinder 1 to buffer external impact; the inner cylinder 3 forms a sandwich structure through the second inner wall 332 and the second outer wall 334, and the sandwich structure is filled with air to form air insulation. The third rib plate 333 is also arranged in the sandwich structure to increase the strength, and the inner cylinder 3 provides sealing isolation for the fuel element; the second inner cover 32, the first inner cover 31 and the outer cover body 21 form a three-layer sealing cover structure of the transport container to prevent critical safety problems of the transport container. Through the above-mentioned structural design and function allocation, the embodiments of the present invention comprehensively consider aspects such as structural design, mechanical analysis, thermal calculation, critical calculation and shielding calculation, and realize all-round protection of new fuel elements of micro-reactors during transportation. It has high strength, high thermal insulation and high safety. Its design can meet the special needs of micro-reactor nuclear fuel transportation, and can meet the needs of road, rail, water and air transportation at the same time. It is an efficient and safe transportation container.

[0050] In some preferred embodiments, the outer cylinder 1 further comprises at least one first flange 11, and the first flange 11 is welded and fixed to the inner side of the shock absorber 18. Preferably, the number of the first flanges 11 is the same as the number of the shock absorbers 18, that is, two first flanges 11.

[0051] In some preferred embodiments, the outer cover 2 further includes a ring plate 26, such as Figure 2 and Figure 3 As shown, the ring plate 26 is arranged below the outer cover body 21, the outer cover body 21 and the ring plate 26 form a stepped cover structure, the outer cover body 21 and the ring plate 26 form a double-layer inverted stepped structure, and the cross-sectional radius of the outer cover body 21 is greater than the cross-sectional radius formed by the ring plate 26. The first flange 11 is arranged as a double-layer stepped structure, and the double-layer steps of the first flange 11 match the double-layer inverted steps formed by the outer cover body 21 and the ring plate 26. The first flange 11 is tightly connected to the outer cover body 21, and the internal structure of the outer cylinder 1 and the outer cover 2 is connected through the first flange 11. The existence of the first flange 11 can effectively prevent the separation of the outer cylinder 1 and the outer cover 2 caused by falling and prevent the transfer of heat. Preferably, the first flange 11 is connected to the outer cover body 21 by high-strength bolts and nuts.

[0052] In some preferred embodiments, the outer cylinder 1 further comprises at least one lifting ear 16, such as Figure 2 As shown, the lifting lug 16 is disposed on the top of the first rib plate 17 to realize the overall lifting and transfer operation of the transport container. Preferably, the number of the lifting lugs 16 is two.

[0053] In some preferred embodiments, the outer cylinder 1 further includes a reinforcing member 14, which is disposed at the bottom of the outer cylinder 1 and connected to the bottom of the outer cylinder 1 and the base 5, and is used to fix the outer cylinder 1 and the base 5. The reinforcing member 14 is L-shaped, with one side of the L-shaped member connected to the bottom of the outer cylinder 1 and the other side connected to the base 5. In order to enhance the fixing effect, preferably, the reinforcing member 14 adopts a reinforcing ring structure.

[0054] In some preferred embodiments, the outer cylinder 1 further includes a first bottom plate 15, which contacts the upper surface of the base 5 and is used to limit the movement of the outer cylinder 1. A filling cotton is arranged above the first bottom plate 15, and a "M"-shaped rib plate (not shown in the figure) is arranged in the filling cotton to support and reduce shock between the outer cylinder 1 and the base 5.

[0055] In some preferred embodiments, the outer cover 2 further includes at least one second rib plate 25, which is arranged along the diameter direction of the outer cover body 21 to increase the structural strength of the outer cover 2. Preferably, the number of the second rib plates 25 is 2. The two second rib plates 25 intersect and are arranged vertically, such as Figure 3 As shown, the outer cover 2 is divided into four equal parts. The space between the second rib plate 25 and the ring plate 26 is filled with heat insulation cotton 22 for heat insulation.

[0056] In some preferred embodiments, Figure 2 As shown, a second bottom plate 24 is further provided at the bottom of the outer cover 2 , a rubber pad 23 is provided above the second bottom plate 24 , the inner cylinder 3 is located below the second bottom plate 24 , and the rubber pad 23 is used for buffering and shock absorption of the inner cylinder 3 .

[0057] In some preferred embodiments, a plurality of connecting bolts are provided between the outer cover 2 and the outer cylinder 1, and the outer cover 2 and the outer cylinder 1 are connected by bolts and nuts.

[0058] In some preferred embodiments, Figure 4 As shown, the inner cylinder body 33 is also provided with a second flange 331, and the second flange 331 is arranged in a double-layer step structure, the first step is closer to the top of the inner cylinder 3 than the second step, and the second step is provided with a double O-ring sealing groove for sealing.

[0059] In some preferred embodiments, Figure 4 As shown, the first inner cover 31 is fixedly connected to the inner cylinder body 33. Preferably, the first inner cover 31 is fixedly connected to the inner cylinder body 33 by hexagonal bolts and nuts.

[0060] In some preferred embodiments, the first inner cover 31 is provided with a pull ring for lifting.

[0061] In some preferred embodiments, Figure 4 As shown, the second inner cover 32 is fixedly connected to the inner cylinder body 33 by screws.

[0062] In some preferred embodiments, Figure 5 As shown, the foam cylinder 4 includes a foam cylinder cover 41 and a foam cylinder body 42, which are used to load the micro-pile fuel element. The foam cylinder body 42 is provided with a plurality of first square grooves for loading the micro-pile fuel element, and the foam cylinder cover 41 is provided with the same number of second square grooves corresponding to the foam cylinder body 42, and the distribution positions of the first square grooves and the second square grooves match, so that the top of the micro-pile fuel element is placed in the foam cylinder cover 41, and the main body and the bottom are placed in the foam cylinder body 42.

[0063] In some preferred embodiments, Figure 6As shown, the base 5 includes a base body 51, a stopper 52, a positioning pin 53, a bolt column 54 and a nut 55. A circular concave platform matching the circular shape of the bottom surface (cross section) of the outer cylinder 1 is arranged at the center of the base body 51, for fitting and placing the outer cylinder 1. There are multiple stoppers 52, which are evenly distributed on the outer side of the circular edge of the concave platform, for resisting and limiting the displacement and movement of the outer cylinder 1. Multiple positioning pins 53, bolt columns 54 and nuts 55 are arranged on the inner side of the circular concave platform, for positioning and fixing the outer cylinder 1 and the base 5. Preferably, the number of bolt columns 54 is equal to the number of nuts 55; the number of bolt columns 54 is twice the number of positioning pins 53. Further preferably, multiple positioning pins 53 are evenly distributed, and a bolt column 54 and a nut 55 are respectively arranged adjacent to each other on both sides of the positioning pins 53.

[0064] In some preferred embodiments, a rubber pad is provided between the circular concave platform of the base body 51 and the outer cylinder 1 .

[0065] In some preferred embodiments, the base 5 is also provided with a forklift slot for the overall transfer of the transport container.

[0066] The present invention also provides a method for loading and unloading the above-mentioned transport container for new fuel elements of a micro-reactor, comprising:

[0067] Remove the bolts and nuts between the outer cover 2 and the outer cylinder 1, and remove the outer cover 2 using the eye screws;

[0068] Remove the bolts and nuts of the first inner cover 31 and remove the first inner cover 31;

[0069] Remove the bolts and nuts of the second inner cover 32 and remove the second inner cover 32;

[0070] Remove the foam cylinder cover 41. When loading, load the new fuel elements of the micro-pile into the multiple square grooves of the foam cylinder body 42 in sequence; when unloading, take out the new fuel elements of the micro-pile in sequence and place them at the designated location;

[0071] The foam cylinder cover 41, the second inner cover 32, the first inner cover 31 and the outer cover 2 are installed in sequence to complete the loading or unloading.

[0072] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A transport container for new fuel elements of a micro reactor, characterized in that: The invention comprises an outer cylinder, an inner cylinder and an outer cover, wherein the outer cylinder and the inner cylinder have the same axis, and the outer cylinder is arranged outside the inner cylinder; the outer cover is arranged above the inner cylinder along the axial direction, and the outer periphery of the outer cover is close to the inner side of the top of the outer cylinder; The outer cylinder is provided with a first outer wall, a first inner wall, a first rib plate and at least one shock absorber, the first inner wall is located on the inner side of the first outer wall and forms a first interlayer with the first outer wall, the first interlayer is filled with a heat insulating material to form a first heat insulating layer, the first rib plate is arranged in the first heat insulating layer and is parallel to the first outer wall and the first inner wall to increase the strength; the shock absorber is sleeved on the top of the outer cylinder, respectively covering a part of the top surface of the outer cylinder and the outer wall close to the top surface; The inner cylinder is provided with an inner cylinder body, and the inner cylinder body is provided with a second outer wall, a second inner wall and a third rib plate, the second inner wall is located inside the second outer wall, and forms a second interlayer with the second outer wall, the second interlayer is filled with air to form a second heat insulation layer, the third rib plate is arranged in the second heat insulation layer, and is parallel to the second outer wall and the second inner wall to increase strength; the inner cylinder is also provided with a first inner cover and a second inner cover, the first inner cover is axially located above the second inner cover for sealing; The outer cover is provided with an outer cover body for sealing; The outer cover body is axially arranged above the first inner cover, and the outer cover body, the first inner cover and the second inner cover form a three-layer sealing structure to prevent critical safety problems of the transport container.

2. The transport container for new fuel elements of a micro reactor according to claim 1, characterized in that: The number of the shock absorbers is 2, and the two shock absorbers together form an arc shape with two notches on the outer wall of the outer cylinder, and the straight line direction where the two notches are located passes through the center of the cross section of the top of the outer cylinder.

3. The transport container for new fuel elements of a micro reactor according to claim 1, characterized in that: The outer cover is also provided with an annular plate, which is arranged below the outer cover body and forms a stepped cover structure with the outer cover body, and the cross-sectional radius of the outer cover body is larger than the cross-sectional radius of the annular plate; the outer cylinder is also provided with at least one first flange, which is welded and fixed to the inner side of the shock absorber, and the first flange is arranged into a double-layer stepped structure, and the double-layer stepped structure matches the stepped cover structure.

4. The transport container for new fuel elements of a micro reactor according to claim 3, characterized in that: The number of the first flanges is the same as the number of the shock absorbers.

5. The transport container for new fuel elements of a micro reactor according to any one of claims 1 to 4, characterized in that: It also includes a base, which is located axially below the outer cylinder and connected to the bottom of the outer cylinder.

6. The transport container for new fuel elements of a micro reactor according to claim 5, characterized in that: The base comprises a base body and a plurality of stoppers. The base body is provided with a circular concave platform matching the cross section of the outer cylinder, and the plurality of stoppers are evenly distributed along the edge of the circular concave platform.

7. The transport container for new fuel elements of a micro reactor according to claim 6, characterized in that: A plurality of positioning pins, bolt columns and nuts are arranged inside the edge of the circular concave platform, and the positioning pins are arranged adjacent to the bolt columns and the nuts.

8. The transport container for new fuel elements of a micro reactor according to any one of claims 1 to 4, characterized in that: The outer cover is further provided with at least one second rib plate, and the second rib plate is distributed along the diameter direction of the top surface of the outer cover.

9. The transport container for new fuel elements of a micro reactor according to claim 8, characterized in that: The number of the second ribs is 2.

10. The transport container for new fuel elements of a micro reactor according to claim 9, characterized in that: The two second ribs intersect and are vertically distributed.

11. The transport container for new fuel elements of a micro reactor according to any one of claims 1 to 4, characterized in that: The inner cylinder body is also provided with a second flange, and the second flange is arranged into a double-layer stepped structure, the double-layer stepped structure includes a first step and a second step, the second step is arranged away from the top of the inner cylinder body, and the second step is provided with a double O-ring sealing groove.

12. The transport container for new fuel elements of a micro reactor according to any one of claims 1 to 4, characterized in that: It also includes a foam cylinder, which is arranged inside the inner cylinder and has the same axis as the inner cylinder and the outer cylinder.

13. The transport container for new fuel elements of a micro reactor according to claim 12, characterized in that: The foam tube is provided with a foam tube cover and a foam tube body. The foam tube body is provided with a plurality of first square grooves. The foam tube cover is correspondingly provided with the same number of second square grooves. The distribution positions of the first square grooves match those of the second square grooves.

14. A method for loading and unloading a transport container for new fuel elements of a micro reactor according to any one of claims 1 to 13, characterized in that: include: Remove the outer cover, the first inner cover, and the second inner cover in sequence; The foam cylinder cover is removed, and when loading, the new fuel elements of the micro-pile are sequentially loaded into the multiple first square grooves of the foam cylinder body; when unloading, the new fuel elements of the micro-pile are sequentially taken out and placed at a designated location; The foam cylinder cover, the second inner cover, the first inner cover and the outer cover are installed in sequence to complete loading or unloading.

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