Plate type new fuel assembly transportation container

Abstract

The invention relates to a plate type new fuel assembly transportation container which comprises a hollow cylindrical barrel, a first shock absorber, a second shock absorber, a first cover and a second cover, and the barrel is used for containing a new fuel assembly to be transported; the first shock absorber and the second shock absorber are arranged at the two ends of the cylinder in a sleeving mode respectively, and a multi-layer heat insulation structure and a steel pipe and steel plate wrapping design are adopted. The first cover body and the second cover body are located on the inner side of the top of the barrel to form a double-layer containing structure. The internal buffer assembly comprises a buffer gasket, a fireproof cloth sleeve and an accelerometer mounting part, provides dual protection for the fuel assembly, and meanwhile, dynamic changes in the transportation process are detected through an accelerometer to ensure that the fuel assembly is intact. The transportation container provided by the invention has excellent shock absorption, heat insulation and inclusiveness, is suitable for safe transportation of the plate-type new fuel assembly, and has a wide application prospect in the field of nuclear fuel transportation.

Description

Technical Field

[0001] The invention relates to the field of radioactive material transportation, and in particular to a plate-type new fuel assembly transportation container. Background Art

[0002] The transportation safety requirements for radioactive materials are extremely high, especially for new fuel assemblies. The fuel assemblies must be kept inside the transport container under both normal transportation conditions and transportation accident conditions. This requires comprehensive design from multiple aspects such as mechanical properties, thermal protection, radiation shielding, and critical safety.

[0003] At present, there are many types of radioactive material transport containers used in actual transportation activities, for example: The transport container with publication number CN111095436A: adopts a double-layer shell design, containing a hollow interlayer filled with heat-insulating and shock-absorbing materials, and the supporting structure includes a load-bearing frame and a supporting assembly, which can realize the fixation and packaging of fuel assemblies, but its thermal insulation performance and sealing under complex conditions still need to be further improved. The transport container with publication number CN111095434A: The supporting assembly consists of a bracket, an outer cover plate and an inner cover plate, and a cavity is surrounded by a semi-circular arc cover plate and a cylindrical structure to provide basic protection functions, but there are still limitations in shock absorption and sealing design. The transport container with publication number CN117711656A: introduces multiple shock-absorbing blocks and a bed frame structure, emphasizing the buffering protection of fuel assemblies, but fails to meet higher heat resistance and sealing requirements.

[0004] Although these technologies have met the needs of road, rail and water transportation to a certain extent, the current domestic new fuel assembly transport containers generally cannot meet the higher safety requirements of air transportation.

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

[0006] The invention discloses a plate-type new fuel assembly transport container, aiming to solve the technical problems existing in the prior art.

[0007] The present invention provides a plate-type new fuel assembly transport container, comprising a cylinder, a first shock absorber, a second shock absorber, a first cover body and a second cover body;

[0008] The cylinder is configured in a hollow cylindrical shape for placing new fuel assemblies to be transported;

[0009] The first shock absorber and the second shock absorber are respectively sleeved at both ends of the cylinder, and the cross-sections of both are ring-shaped and used for shock absorption; the first shock absorber is provided with a second insulation layer, a third insulation layer and a first steel pipe layer connected in sequence, and the second shock absorber is provided with a fourth insulation layer, a fifth insulation layer and a second steel pipe layer connected in sequence, the second insulation layer and the fourth insulation layer are respectively connected to the top and the tail of the cylinder, and the first steel pipe layer and the second steel pipe layer are both provided with steel plates, and the steel plates cover a plurality of steel pipes;

[0010] The first cover body and the second cover body are located on the inner side of the top of the cylinder and are distributed in sequence from the outside to the inside to form a double-layer enclosure. The first cover body and the second cover body are both arranged in a disc shape to match the circular cross-section of the cylinder. The first cover body is connected to the inner side of the top of the cylinder, and the outer peripheral edge of the second cover body is arranged in a large thread shape to be threadedly connected to the top of the cylinder.

[0011] As a preferred technical solution, the second cover body includes a second cover body main body, and an airtightness detection port is provided inside the second cover body main body.

[0012] As a preferred technical solution, the first cover body includes a first cover body and a plurality of third bolt holes, and the plurality of third bolt holes are evenly distributed on the outer peripheral edge of the first cover body.

[0013] As a preferred technical solution, the second heat insulation layer is provided with a plurality of second ribs arranged along its axial direction.

[0014] As a preferred technical solution, the second thermal insulation layer and the fourth thermal insulation layer are respectively provided with at least one first bolt hole and at least one second bolt hole, and bolt assemblies are installed on the first bolt holes and the second bolt holes, so that the second thermal insulation layer and the fourth thermal insulation layer are respectively fastened to the top and the tail of the cylinder.

[0015] As a preferred technical solution, the third heat-insulating layer and the fifth heat-insulating layer are respectively provided with at least one third rib plate and at least one fifth rib plate arranged along the axial direction.

[0016] As a preferred technical solution, the third thermal insulation layer and the fifth thermal insulation layer are further provided with a plurality of fourth ribs and a plurality of sixth ribs respectively along the circumferential direction, and the plurality of fourth ribs and the plurality of sixth ribs are respectively evenly distributed along the circumferential direction of the third thermal insulation layer and the fifth thermal insulation layer.

[0017] As a preferred technical solution, it also includes a buffer component, which is arranged inside the cylinder and includes a buffer pad and a fireproof cloth cover. The buffer pad carries the new fuel assembly, and the fireproof cloth cover is covered on the outside of the buffer pad.

[0018] As a preferred technical solution, the buffer assembly is further provided with an accelerometer mounting portion, and the accelerometer mounting portion is arranged in the buffer pad.

[0019] The technical solution adopted by the present invention can achieve at least one of the following beneficial effects:

[0020] 1. The present invention adopts a hollow cylindrical barrel design and fills it with high-efficiency thermal insulation materials, which significantly improves the fireproof and thermal insulation performance, ensuring that the transport container can still effectively prevent heat from being transferred to the inside under extreme conditions such as fire, and protect the safety of the new fuel assembly. The first shock absorber and the second shock absorber at both ends of the barrel are designed with a multi-layer thermal insulation structure, and the strength is enhanced by the rib plate, which effectively isolates the heat transfer at the top and bottom, and further improves the overall thermal insulation effect.

[0021] 2. The external shock-absorbing device of the present invention adopts a multi-layer steel pipe cladding structure, which not only effectively alleviates the load caused by impact, but also improves the overall mechanical strength. The double-layer sealing structure on the top of the container includes a first cover body and a second cover body, which are connected by bolts and threads to enhance the sealing effect, prevent water vapor intrusion and leakage of contents, and ensure the environmental safety during the transportation of radioactive materials. The second cover body is also provided with an airtightness detection port, which is convenient for real-time detection of airtightness and improves the safety and reliability of the transportation process.

[0022] 3. The internal buffer assembly of the present invention adopts a double protection design of buffer pad and fireproof cloth cover, which not only effectively reduces the impact of vibration on the fuel assembly, but also reduces the risk of fire. The buffer assembly also integrates an accelerometer installation part to detect the acceleration change during transportation to ensure that the fuel assembly meets the transportation limit requirements, thereby improving the intelligence and safety of transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 It is a front view structural schematic diagram of a cross section of a plate-type new fuel assembly transport container of the present invention;

[0025] Figure 2 It is a front view structural schematic diagram of a plate-type new fuel assembly transport container of the present invention;

[0026] Figure 3 is a schematic diagram of the three-dimensional structure of the first shock absorber of the present invention;

[0027] Figure 4 It is a left-side structural schematic diagram of the first shock absorber of the present invention;

[0028] Figure 5 is a schematic diagram of the three-dimensional structure of the second shock absorber of the present invention;

[0029] Figure 6It is a left-side structural schematic diagram of the second shock absorber of the present invention;

[0030] Figure 7 It is a structural schematic diagram of the first cover body of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the second cover body of the present invention.

[0032] Description of reference numerals:

[0033] 1. Cylinder; 11. First insulation layer; 12. First rib plate; 2. First shock absorber; 21. Second insulation layer; 211. Second insulation material; 212. Second rib plate; 213. First bolt hole; 22. Third insulation layer; 221. Third insulation material; 222. Third rib plate; 223. Fourth rib plate; 23. First steel pipe layer; 3. Second shock absorber; 31. Fourth insulation layer; 311. Fourth insulation material; 312. Second bolt hole; 32. Five insulation layers; 321. Fifth insulation material; 322. Fifth rib plate; 323. Sixth rib plate; 33. Second steel pipe layer; 4. First cover body; 41. First cover body main body; 42. Third bolt hole; 5. Second cover body; 51. Second cover body main body; 52. Air tightness detection port; 6. Buffer assembly; 61. Accelerometer mounting part; 62. Buffer pad; 63. Fireproof cloth cover; 7. First seal; 8. Second seal; 9. Lifting ear; 10. Tethered limit ring. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In order to solve the problems existing in the prior art, the embodiment of the present invention provides a plate-type new fuel assembly transport container, and more particularly, relates to a horizontal transport container, such as Figure 1-Figure 6 As shown, it includes a cylinder 1, a first shock absorber 2, a second shock absorber 3, a first cover 4, a second cover 5 and a buffer assembly 6. The cylinder 1 is cylindrical as a whole, and is used as the main structure to provide the necessary strength and rigidity, and prevent radiation leakage and heat insulation of the plate-type new fuel assembly; the buffer assembly 6 is arranged inside the cylinder 1, and is used to carry the plate-type new fuel assembly; the first shock absorber 2 and the second shock absorber 3 are respectively arranged at both ends of the cylinder 1 for mechanical shock absorption; the first cover 4 and the second cover 5 are connected and arranged on the inner side of the top end of the cylinder 1 for sealing.

[0038] like Figure 1 As shown, the cylinder 1 is arranged to be hollow inside to provide space for storing the plate-type new fuel assembly, and the buffer assembly 6 carrying the plate-type new fuel assembly is arranged in the above hollow structure. The cylinder 1 includes a first insulation layer 11 and a first rib plate 12. The first insulation layer 11 is arranged inside the cylinder 1 to play a role of fire prevention and heat insulation to effectively reduce the heat transfer to the inside of the cylinder 1 under fire accident conditions; a plurality of circumferential first rib plates 12 are arranged inside the first insulation layer 11 to increase the overall strength of the cylinder 1. Preferably, in order to increase the fire prevention and heat insulation effect, the first insulation layer 11 uses an aluminum silicate wool blanket.

[0039] like Figure 1 , Figure 3 and Figure 4 As shown, a first shock absorber 2 and a second shock absorber 3 are provided at both ends of the cylinder 1. The cross-sections of the first shock absorber 2 and the second shock absorber 3 are both annular and are sleeved on both ends of the cylinder 1 for mechanical shock absorption and heat insulation.

[0040] The first shock absorber 2 includes a second insulation layer 21, a third insulation layer 22 and a first steel tube layer 23 connected in sequence. The second insulation layer 21 is arranged on the inner side and is directly connected to the cylinder 1. From the inside to the outside, the third insulation layer 22 and the first steel tube layer 23 are distributed in sequence, and the first steel tube layer 23 is in direct contact with the outside. The second insulation layer 21 includes a second insulation material 211 and a plurality of second ribs 212. The plurality of second ribs 212 are axially arranged on the inner side of the second insulation layer 21. The second insulation material 211 is filled in the second insulation layer 21 and covers the plurality of second ribs 212, which are used to insulate the top of the cylinder 1. The second ribs 212 are used to increase the strength. At least one first bolt hole 213 is also provided on the second insulation layer 21 for installing a bolt assembly. The first shock absorber 2 and the top of the cylinder 1 are fastened and connected through the above-mentioned first bolt hole 213 and the bolt assembly installed thereon. Preferably, the number of the first bolt holes 213 is multiple. Further preferably, the number of the first bolt holes 213 is 14-18. The third thermal insulation layer 22 includes a third thermal insulation material 221, at least one third rib plate 222 and a plurality of fourth rib plates 223, the third rib plate 222 is axially arranged in the third thermal insulation material 221, and the plurality of fourth rib plates 223 are uniformly arranged in the third thermal insulation material 221 along the circumferential direction to increase the strength of the third thermal insulation layer 22. The first steel pipe layer 23 includes a plurality of steel pipes, which are coated with steel plates and are mainly used for mechanical shock absorption.

[0041] The second shock absorber 3 includes a fourth insulation layer 31, a fifth insulation layer 32 and a second steel pipe layer 33 in sequence. The fourth insulation layer 31 is provided with a fourth insulation material 311 and at least one second bolt hole 312. The second bolt hole 312 is used to install a bolt assembly. The second shock absorber 3 and the bottom of the cylinder 1 are fastened and connected through the above-mentioned second bolt hole 312 and the bolt assembly installed thereon. Preferably, the number of the second bolt holes 312 is multiple. Further preferably, the number of the second bolt holes 312 is 14-18. The structure of the fifth insulation layer 32 is similar to that of the third insulation layer 22, including a fifth insulation material 321, at least one fifth rib plate 322 and a plurality of sixth rib plates 323. The fifth rib plate 322 is axially arranged in the fifth insulation material 321, and the plurality of sixth rib plates 323 are uniformly arranged in the fifth insulation material 321 along the circumferential direction to increase the strength of the fifth insulation layer 32. The second steel pipe layer 33 is disposed on the outer side of the fifth heat insulation layer 32 and includes a plurality of steel pipes which are covered by steel plates and are mainly used for mechanical shock absorption.

[0042] Preferably, the second thermal insulation material 211, the third thermal insulation layer 221, the fourth thermal insulation material 311 and the fifth thermal insulation material 321 are made of polystyrene foam board, polyurethane foam, vacuum insulation panel, aerogel material, mineral wool (rock wool or glass wool), foam glass, etc.

[0043] like Figure 1 , Figure 5 and Figure 6 As shown, the inner side of the top end of the cylinder 1 is provided with a first cover body 4 and a second cover body 5 in sequence from outside to inside for sealing. The first cover body 4 is provided with a disc-shaped first cover body 41, and a plurality of third bolt holes 42 evenly distributed along the outer peripheral edge of the first cover body 41 for fixing. The second cover body 5 is provided with a disc-shaped second cover body 51, and an airtightness detection port 52 arranged in the second cover body 51. The outer peripheral edge of the second cover body 51 is arranged in a large thread shape, which is threadedly connected to the top end of the cylinder 1. A self-locking pressure joint is installed at the airtightness detection port 52, which can detect the airtightness of the inner cavity of the cylinder 1.

[0044] like Figure 1 As shown, the buffer assembly 6 includes a buffer pad 62 that wraps the plate-type new fuel assembly, and a fireproof cloth cover 63 arranged on the outside of the buffer pad 62. The buffer pad 62 is used for shock absorption and buffering to ensure that the acceleration of the plate-type new fuel assembly during transportation meets the transportation limit requirements. The buffer assembly 6 is also provided with an accelerometer installation part 61, which is located in the buffer pad 62 and is used to install an accelerometer to detect the acceleration of the plate-type new fuel assembly during transportation. The fireproof cloth cover 63 wraps the buffer pad 62 to further reduce the risk of fire and damage and increase safety.

[0045] Through the above-mentioned structural design, the cylinder 1 adopts a cylindrical cylinder and is arranged horizontally, with a first insulation layer 11 and a first rib plate 12 for increasing strength. It can not only effectively insulate but also has high structural strength, effectively prevent external heat transfer, and ensure the safety of the fuel assembly under extreme conditions such as fire; the first shock absorber 2 and the second shock absorber 3 are arranged at both ends of the cylinder 1, both of which adopt a multi-layer insulation and steel pipe covering structure, which not only provides excellent shock absorption performance, but also increases the insulation effect, reduces the impact and fire on the fuel assembly. The internal buffer assembly 6 covers the fuel assembly with a flexible liner and integrates an accelerometer to detect the transportation acceleration, further ensuring that the fuel assembly meets the transportation safety requirements; the top seal of the cylinder 1 adopts a double-layer design of the first cover body 4 and the second cover body 5, and the second cover body 5 is also provided with an airtightness detection port 52, which can realize airtightness testing, prevent leakage of radioactive materials and effectively resist external water vapor intrusion. In the overall structural optimization design of the present invention, the external shock-absorbing device reduces the impact load during transportation, the multi-layer insulation material in the cylinder and the shock absorber significantly improves the fireproof and heat-insulating performance, and the double-layer sealing structure ensures radiation safety and environmental protection. It can meet the needs of road, rail, water and air transportation at the same time, and is an efficient and safe transportation container.

[0046] In some preferred embodiments, a first sealing member 7 is provided between the first cover 4 and the inner surface of the top of the cylinder 1 to increase the sealing effect. Preferably, the first sealing member 7 is a rubber sealing ring, which mainly plays a role of waterproofing and dustproofing.

[0047] In some preferred embodiments, a second seal 8 is provided at one end of the second cover 5 close to the buffer assembly 6, for sealing the second cover 5 with the inner side of the cylinder 1. Preferably, the second seal 8 is a polytetrafluoroethylene pad, a rubber seal ring or a vacuum seal pad.

[0048] In some preferred embodiments, Figure 2 As shown, the transport container further comprises at least one lifting lug 9 for lifting and moving the transport container. Preferably, the number of the lifting lugs 9 is multiple. Further preferably, the number of the lifting lugs 9 is two.

[0049] In some preferred embodiments, Figure 2 As shown, the transport container also includes at least one tethering limit ring 10, which can cooperate with the external tethering bracket to perform tethering, fixing and stacking operations of the transport container. Preferably, the number of tethering limit rings 10 is multiple. Further preferably, the number of tethering limit rings 10 is 2-4.

[0050] The present invention also provides a method for loading and unloading the plate-type new fuel assembly transport container, comprising:

[0051] Remove the first shock absorber 2 located at the top of the cylinder 1;

[0052] Remove the first cover 4 and the second cover 5;

[0053] When loading, a buffer pad 62 is packed outside the plate-type new fuel assembly, and an accelerometer is installed. A fireproof cloth cover 63 is installed outside the buffer pad 62, and the zipper of the fireproof cloth cover is closed. When unloading, the fireproof cloth cover 63 is removed, the accelerometer is removed, and the buffer pad 62 is removed.

[0054] The second cover body 5, the first cover body 4 and the first shock absorber 2 are installed in sequence to complete the loading or unloading.

[0055] 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 plate-type new fuel assembly transport container, characterized in that: It includes a cylinder, a first shock absorber, a second shock absorber, a first cover body and a second cover body; The cylinder is configured to be in a hollow cylindrical shape and is used to place new fuel assemblies to be transported; The first shock absorber and the second shock absorber are respectively sleeved on both ends of the cylinder, and both have a circular ring-shaped cross section for shock absorption; the first shock absorber is provided with a second insulation layer, a third insulation layer and a first steel pipe layer connected in sequence, and the second shock absorber is provided with a fourth insulation layer, a fifth insulation layer and a second steel pipe layer connected in sequence, the second insulation layer and the fourth insulation layer are respectively connected to the top and the tail of the cylinder, and the first steel pipe layer and the second steel pipe layer are both provided with steel plates, and the steel plates cover a plurality of steel pipes; The first cover body and the second cover body are located on the inner side of the top of the cylinder and are distributed in sequence from the outside to the inside to form a double-layer enclosure. The first cover body and the second cover body are both arranged in a disc shape to match the circular cross-section of the cylinder. The first cover body is connected to the inner side of the top of the cylinder, and the outer peripheral edge of the second cover body is arranged in a large thread shape to be threadedly connected to the top of the cylinder.

2. The plate-type new fuel assembly transport container according to claim 1, characterized in that: The second cover body comprises a second cover body main body, and an airtightness detection port is arranged in the second cover body main body.

3. The plate-type new fuel assembly transport container according to claim 1, characterized in that: The first cover body includes a first cover body and a plurality of third bolt holes, and the plurality of third bolt holes are evenly distributed on the outer peripheral edge of the first cover body.

4. The plate-type new fuel assembly transport container according to claim 1, characterized in that: The second heat insulation layer is provided with a plurality of second ribs arranged along its axial direction.

5. The plate-type new fuel assembly transport container according to claim 4, characterized in that: The second thermal insulation layer and the fourth thermal insulation layer are respectively provided with at least one first bolt hole and at least one second bolt hole, and bolts are installed on the first bolt hole and the second bolt hole so that the second thermal insulation layer and the fourth thermal insulation layer are respectively fastened to the top and the tail of the cylinder.

6. The plate-type new fuel assembly transport container according to claim 1, characterized in that: The third heat insulation layer and the fifth heat insulation layer are respectively provided with at least one third rib plate and at least one fifth rib plate arranged in the axial direction.

7. The plate-type new fuel assembly transport container according to claim 6, characterized in that: The third thermal insulation layer and the fifth thermal insulation layer also have a plurality of fourth ribs and a plurality of sixth ribs respectively arranged along the circumferential direction, and the plurality of fourth ribs and the plurality of sixth ribs are uniformly distributed along the circumferential direction of the third thermal insulation layer and the fifth thermal insulation layer respectively.

8. The plate-type new fuel assembly transport container according to any one of claims 1 to 7, characterized in that: It also includes a buffer component, which is arranged inside the cylinder and includes a buffer pad and a fireproof cloth cover. The buffer pad carries the new fuel component, and the fireproof cloth cover is covered on the outside of the buffer pad.

9. The plate-type new fuel assembly transport container according to claim 8, characterized in that: The buffer assembly is further provided with an accelerometer mounting portion, and the accelerometer mounting portion is arranged in the buffer pad.

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