CN111095437A

CN111095437A - Fuel assembly shipping container and top closure therefor

Info

Publication number: CN111095437A
Application number: CN201880058205.1A
Authority: CN
Inventors: 吴涛; 吴腾; 李其朋; 彭云杰; 朱国胜; 王超; 王弟东; 张春艳; 蔡进
Original assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Priority date: 2018-11-26
Filing date: 2018-11-26
Publication date: 2020-05-01
Also published as: WO2020107182A1

Abstract

A fuel assembly transportation container and a top closing device thereof are provided, wherein the top closing device comprises a door plate (2221) used for covering the upper end of a transportation container cavity and a locking structure which is arranged on the door plate (2221) and axially locks a fuel assembly (3) in a transportation container (4). The locking structure comprises a first locking rod (2222) and a second locking rod (2223) which are arranged on a door panel (2221) in an axial position adjustable mode, wherein the first locking rod (2222) is located in the middle of the door panel (2221) and opposite to the center of an upper pipe seat of the fuel assembly (3), the second locking rod (2223) comprises at least two locking rods, and the locking rods are arranged on the periphery of the first locking rod (2222) in a central symmetry mode. Under the condition that the door plate (2221) does not need to be disassembled and assembled, the first lock rod (2222) and the second lock rod (2223) of the locking structure can be respectively and independently adjusted, so that the locking device not only can be used for pressing the fuel assembly (3) without related components, but also can be used for pressing the fuel assembly (3) with the related components, and is multifunctional, convenient to operate and simple to maintain.

Description

Fuel assembly shipping container and top closure therefor

Technical Field

The invention relates to the field of nuclear power, in particular to a fuel assembly transportation container and a top cover sealing device thereof.

Background

The upper end of a fuel assembly in a fuel assembly transportation container in the related art is usually fixed and positioned after being compressed by an upper end plate, and due to the fixed position of the upper end plate, the fuel assembly is easily subjected to over-pressure or not compressed, so that certain potential safety hazards exist.

Disclosure of Invention

The invention aims to provide a fuel assembly transportation container and a top cover device thereof.

The technical scheme adopted by the invention for solving the technical problems is as follows: the top cover sealing device of the fuel assembly transport container is constructed and comprises a door plate and a locking structure, wherein the door plate is used for covering the upper end of a transport container accommodating cavity, and the locking structure is arranged on the door plate and is used for axially locking the fuel assembly in the transport container;

the locking structure comprises a first locking rod and a second locking rod, the axial position of the first locking rod and the second locking rod are adjustably installed on the door plate, the first locking rod is located in the middle of the door plate and opposite to the center of the upper pipe seat of the fuel assembly, the second locking rod comprises at least two locking rods, and the locking structure is arranged on the periphery of the first locking rod in a centrosymmetric mode.

Preferably, the first lock rod and the second lock rod are respectively screwed on the door panel.

Preferably, the first locking rod and the second locking rod are screwed with adjusting nuts at ends far away from the transportation container cavity.

Preferably, the end parts of the first locking rod and the second locking rod opposite to the transportation container cavity are provided with soft buffer heads.

Preferably, the cushion head is a soft rubber pad.

Preferably, the end parts of the first lock rod and the second lock rod opposite to the transportation container containing cavity are provided with pressing blocks, and the buffer head is arranged on one side of the pressing blocks opposite to the containing cavity.

Preferably, the buffer head is sleeved on the compression block.

Preferably, a compression spring is distributed on one side of the upper pipe seat of the fuel assembly opposite to the door plate, and the second locking rod is opposite to the compression spring on the upper pipe seat of the fuel assembly.

Preferably, the top cover sealing device comprises two door panels hinged to each other, each door panel is provided with the locking structure, and each door panel is opposite to the cavity for accommodating different fuel assemblies in the transportation container.

A fuel assembly shipping container comprising said top closure assembly.

The fuel assembly transportation container and the top cover device thereof have the following beneficial effects: under the condition that need not dismouting door plant, first locking lever, the independent regulation respectively of second locking lever of locking structure both can be used for compressing tightly not taking the fuel assembly of relevant subassembly, can compress tightly the fuel assembly of taking relevant subassembly again, and multi-functional use, the device convenient operation, it is simple to maintain.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic perspective view of a fuel assembly shipping container in an embodiment of the present invention;

FIG. 2 is a schematic structural view of the fuel assembly shipping container of FIG. 1 with the support assembly set up;

FIG. 3 is a schematic view of the upper housing of FIG. 1 after opening;

FIG. 4 is an exploded schematic view of the fuel assembly shipping container of FIG. 1;

FIG. 5 is a schematic transverse cross-sectional view of the support assembly of FIG. 1;

FIG. 6 is a cross-sectional view of a buffer of the buffer structure of FIG. 5;

FIG. 7 is a schematic view of a cover of the support assembly of FIG. 4 shown flipped open;

FIG. 8 is a schematic cross-sectional view of the support assembly of FIG. 4;

FIG. 9 is a cross-sectional view of the outer cover plate and the assembly on the outer cover plate of FIG. 8;

FIG. 10 is a schematic perspective view of the lower end cap of FIG. 4;

FIG. 11 is a cross-sectional schematic view of the lower endcap of FIG. 10;

FIG. 12 is a schematic perspective view of the flapper of FIG. 11 shown open;

fig. 13 is a perspective view of the upper end cap of fig. 4.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, the fuel assembly transport container in one preferred embodiment of the present invention includes a housing 1 and a support structure 2 disposed inside the housing 1, and the support structure 2 includes a carrier 21 and a support assembly 22.

The carrier 21 is mounted inside the casing 1, the support assembly 22 is mounted on the carrier 21, two cavities 4 for accommodating and fixing the fuel assemblies 3 are formed in the support assembly 22, and the fuel assemblies 3 are generally cylindrical structures. The support assembly 22 can drive the fuel assembly 3 in the chamber 4 to be horizontally placed or erected.

The other end of the support component 22 is provided with a loading and unloading port 221, when the support component 22 is erected, the loading and unloading port 221 is positioned at the upper end of the cavity 4, and the fuel component 3 is axially inserted into the cavity 4 from the loading and unloading port 221 or axially separated from the cavity 4 from the loading and unloading port 221.

The end of the cavity 4 opposite to the loading and unloading port 221 is provided with a lower end cover 225 for circumferentially positioning the fuel assembly 3, and the loading and unloading port 221 is provided with an upper end cover 222 for sealing the cavity 4 and axially positioning the fuel assembly 3 in the cavity 4.

The support assembly 22 can rotate in a horizontal state and a vertical state under the action of the crane, and when the support assembly 22 is in the vertical state, the fuel assembly 3 is conveniently vertically hung into the cavity 4, and the support assembly 22 with the fuel assembly 3 is also conveniently rotated to the horizontal state. The loading process of the fuel assembly 3 is simpler and faster, the loading efficiency is improved, and the fuel assembly 3 can be conveniently transported after the support assembly 22 and the fuel assembly 3 are placed horizontally and are accommodated in a transport container.

After fuel assemblies 3 are placed in cavity 4 and prior to capping upper end cap 222, fuel assemblies 3 are circumferentially oriented and prevented from rotating within cavity 4. After the upper end cover 222 is covered on the sealing cover, the fuel assembly 3 can be axially positioned, longitudinal movement in the accommodating cavity 4 is prevented, full restraint of the fuel assembly 3 is realized, shaking in the accommodating cavity 4 in the transportation process is prevented, and the safety and stability of transportation are improved.

Referring to fig. 5, in general, the casing 1 includes a lower casing 11 and an upper casing 12 mounted on the upper side of the lower casing 11, the lower casing 11 and the upper casing 12 are assembled to form a cylindrical structure with a horizontal axis for easy loading and transportation, in this embodiment, the cylindrical structure is octagonal, and of course, the outer shape of the casing 1 may also be a square cylindrical structure with a horizontal axis.

The side walls of the lower shell 11 and the upper shell 12 are both of a double-layer structure with a hollow interlayer, so that the shell has higher impact resistance and excellent heat insulation, shock absorption and decontamination performances.

Preferably, the upper casing 12 includes an upper outer casing 122, an upper inner casing 123, and upper end plates 124 disposed at both ends, and the upper outer casing 122 and the upper inner casing 123 are spaced apart from each other to form a double-layered structure with a hollow sandwich. The lower housing 11 includes a lower outer shell 112, a lower inner shell 113, and lower end plates 114 disposed at both ends, and the lower outer shell 112 and the lower inner shell 113 are spaced from each other to form a double-layered structure with a hollow interlayer.

The heat insulation and shock absorption materials are filled between the upper outer shell 122 and the upper inner shell 123 and between the lower outer shell 112 and the lower inner shell 113. The packing has thermal-insulated shock-absorbing material between bilayer structure, and the vibrations that can effectively alleviate the container and the influence of outside striking to the subassembly in the container when falling produce reduce the conduction of heat to casing inside when the condition is burnt to the fire simultaneously. The heat-insulating and shock-absorbing material can be filled into the polygonal double-layer structure of the upper shell and the lower shell after being molded, has small volume and is easy to replace; and a plurality of groups of fuel assemblies can be contained in the container.

Furthermore, reinforcing ribs 13 are arranged between the upper outer shell 122 and the upper inner shell 123 and between the lower outer shell 112 and the lower inner shell 113, so that the strength of the outer shell 1 can be improved, the deformation in the hoisting and carrying processes can be prevented, and the impact resistance can also be improved.

As shown in fig. 2 to 4, in some embodiments, two ends of the upper housing 12 are respectively provided with a latch 121 extending toward one side of the lower housing 11, and a slot 111 for the latch 121 to be latched is provided on an inner side of an end surface of the lower housing 11. The latch 121 comprises a steel plate and cork wrapped outside the steel plate, so that the strength can be ensured, and the effect of buffering and shock absorption can be achieved.

When the upper housing 12 is mounted to the lower housing 11, the latch 121 is snapped into the latch groove 111 to facilitate positioning therebetween. The end faces of the lower shell 11 and the upper shell 12 are polygonal in shape, and form an octagonal prism structure after being assembled, and flange edges for mutually locking and connecting the lower shell 11 and the upper shell 12 are respectively arranged on the adjacent edges of the lower shell 11 and the upper shell 12. The edge of the upper shell 12 and the edge of the lower shell 11 are respectively provided with a flange edge, so that the upper shell 12 and the lower shell 11 can be locked and fixed.

The two ends of the upper shell 12 are provided with hoisting structures for hoisting, and the hoisting structures are provided with first hoisting holes 125. The lower side of the lower shell 11 is provided with a support leg, and the support leg is provided with a first hoisting hole 115 for hoisting. The lower side of the lower shell 11 is also provided with a forklift hole 116 for supporting a forklift after insertion. And hoisting holes and forklift holes 116 are arranged in multiple hoisting modes, so that hoisting is more convenient.

Referring to fig. 2 to 6, it is preferable that the loading frame 21 is provided at its lateral sides with buffer structures 14 elastically coupled to the lower case 11, so that the loading frame 21 is suspended in the lower case 11, and the suspension and elastic coupling can reduce the impact of the external impact on the loading frame 21. The buffer structure 14 can absorb the impact transmitted from the housing 1 to the carrier 21, and avoid the impact on the fuel assembly 3.

In some embodiments, the cushioning structure 14 includes several cushioning members 141 distributed on the sides of the carrier 21 and connected between the lower shell 11. The cushion 141 serves as a shock absorbing device for absorbing and buffering the fuel assembly to prevent the fuel assembly from being impacted, and the cushion 141 may be generally distributed at the longitudinal sides of the carrier 21, or the cushion 141 may be distributed at each side.

The cushion 141 includes a resilient cushion body 1411, and a top plate 1412 and a bottom plate 1413 disposed at opposite ends of the cushion body 1411. The top plate 1412 and the bottom plate 1413 are respectively provided with a first embedded portion 1414 and a second embedded portion 1415 embedded in the shock absorption body 1411, and the first embedded portion 1414 and the second embedded portion 1415 are both provided with an inverted structure for preventing the shock absorption body 1411 from falling off, so that the connection between the shock absorption body 1411 and the top plate 1412 and the bottom plate 1413 is firmer.

The first embedded part 1414 and the second embedded part 1415 improve the shearing performance of the shock absorption body 1411, so that the shock absorption body 1411 has smaller deformation and longer service life.

The top plate 1412 and the bottom plate 1413 are respectively connected to the inner walls of the carrier 21 and the lower housing 11, and are fixedly connected with the carrier 21 and the lower housing 11. The buffer body is clamped between the bearing frame 21 and the shell 1, and can play a role in buffering and preventing vibration. In other embodiments, the damping body 1411 may also be a spring, a leaf spring, or the like.

The first embedded part 1414 comprises a first embedded section 1416 and a second embedded section 1417 which are connected in sequence, one end of the first embedded section 1416, which is far away from the second embedded section 1417, is connected with the top plate 1412, and the second embedded section 1417 forms an inverted buckle to prevent the first embedded section 1416 and the shock absorption body 1411 from falling off.

In this embodiment, the first embedding section 1416 and the second embedding section 1417 are both cylindrical, and the cross-sectional profile of the second embedding section 1417 is larger than that of the first embedding section 1416, so that the step difference between the two sections forms an inverse buckle.

The middle of the damping body 1411 is provided with a through connecting hole, the connecting hole comprises a first hole section and a second hole section, and the section size of the second hole section is larger than that of the first hole section. The first embedment section 1416 is inserted into the first bore section and the second embedment section 1417 is located within the second bore section and embedded within the inner wall surface of the second bore section.

The middle part of the top plate 1412 is screwed with a bolt and can be connected with the bearing frame 21 through the bolt. Preferably, the first embedding section 1416, the second embedding section 1417, the first hole section and the second hole section are coaxially arranged, so that the assembling and the positioning are facilitated, and the stress is more balanced.

The connecting holes are located in the middle of the shock absorption body 1411, the connecting holes enable the middle of the shock absorption body 1411 to form a hollow structure, the weight of the shock absorption body 1411 is reduced, materials are saved, and the shock absorption performance of the shock absorption body 1411 is improved.

The middle part of the bottom plate 1413 is provided with a through hole correspondingly communicated with the second hole section, so that the connecting hole is communicated with the outside.

The second embedded portion 1415 includes a third embedded section 1418 and a fourth embedded section 1419 connected in sequence, wherein an end of the third embedded section 1418 away from the fourth embedded section 1419 is connected to the bottom plate 1413, and the fourth embedded section 1419 forms an inverted buckle to prevent the shock absorbing body 1411 from falling off.

The third embedment section 1418 is cylindrical and the fourth embedment section 1419 is conical. In other embodiments, the fourth embedding section 1419 may also be cylindrical and have a cross-sectional dimension different from that of the third embedding section 1418, so as to form an inverted structure.

The first embedded part 1414 and the second embedded part 1415 can also be embedded into the shock absorption body 1411 in a distributed manner, wherein a plurality of sheet-shaped structures distributed along the circumferential direction are embedded into the shock absorption body 1411, and the end parts of the sheet-shaped structures are bent to form an inverted buckle.

The top plate 1412 and the bottom plate 1413 cover end faces of two ends of the shock absorption body 1411 respectively to clamp the shock absorption body 1411, and a plurality of connecting holes are distributed in the bottom plate 1413 and are fixedly connected with the housing 1 after penetrating through the locking piece, so that the shock absorption body 1411 is easy to disassemble and assemble.

Roof and bottom plate are embedded in shock attenuation body 1411, connect more firmly, have solved the connection problem of shock attenuation body 1411 with the steel sheet, make the shock attenuation body 1411 of steel roof, bottom plate and rubber material connect more firmly, simultaneously, because the embedding has set up the interior bushing plate of steel in shock attenuation body 1411, and then further promote shock attenuation body 1411's elasticity and shear property, improved shock attenuation body 1411's life.

As shown in fig. 3, a support arm 23 is further provided between the support assembly 22 and the carriage 21 to support the support assembly 22 when the support assembly 22 is vertically disposed, so as to prevent tilting during loading of the fuel assembly 3.

The supporting arm 23 is rotatably connected with the supporting assembly 22, the bearing frame 21 is provided with a guide rail 211 arranged along the longitudinal direction, the supporting arm 23 is in sliding fit with the guide rail 211, and one end of the guide rail 211 is provided with a clamping structure for clamping and positioning the supporting arm 23.

The engaging structure includes an engaging member capable of swinging toward the upper side of the guide rail 211, and an elastic member for providing an elastic force to keep the engaging member at the upper side of the guide rail 211.

During erection of the support assembly 22, the support arm 23 moves over the guide track 211 to press the catch against the guide track 211. After the support assembly is erected, the support arm 23 is separated from the engaging member, the engaging member is reset to the upper side of the guide rail 211, and the engaging member abuts against and engages with the support arm 23, so that the support assembly 22 is positioned and the support assembly 22 is prevented from turning downward. After the fuel assembly 3 is loaded into the support assembly 22, the engaging member is pressed down to the lower side of the guide rail 211, so as to release the support arm 23, and the support arm 23 slides in the reverse direction to pass through the engaging member and be received under the support assembly 22.

As shown in fig. 4, 5 and 7, in some embodiments, the support assembly 22 includes a bracket 223 and an outer cover plate 224, an inner cover plate 227, and a lower cover 225 that collectively define the receptacle 4. Preferably, the support 223 extends in a longitudinal direction of the receiving chamber 4, and the support 223 has a T-shaped cross section including a bottom wall 2231 and a side wall 2232 provided at one side of the bottom wall 2231.

The outer cover plate 224, the inner cover plate 227 and the side wall 2232 are located on the same side of the bottom wall 2231, the outer cover plate 224 and the side wall 2232 are connected to an outer edge of the bottom wall 2231 away from the bottom wall 2231 and two longitudinal edges of the bottom wall 2231, two cavities 4 for accommodating fuel assemblies 3 are defined on two sides of the side wall 2232, and portions of the outer cover plate 224, the inner cover plate 227 and each cavity 4 are in a semi-circular arc shape.

The outer cover plate 224 with the arc-shaped structure can improve the stress strength of the outer cover plate 224, is more stable when encountering rollover and falling impact, can avoid the impact and protects the internal fuel assembly 3. The outer cover plate 224 with the circular arc structure is compact in structure, and the requirement for an external loading structure is lowered.

Preferably, an outer cover plate 224 is disposed correspondingly to each of the cavities 4, such that two sides of the arc-shaped outer cover plate 224 are connected to the outer edges of the side walls 2232 away from the bottom wall 2231 and a longitudinal side of the bottom wall 2231.

Meanwhile, the inner cover plate 227 is disposed in an angle formed by the bottom wall 2231 and the side wall 2232, and preferably, a support plate 228 supported by the inner cover plate 227 is disposed in the angle formed by the bottom wall 2231 and the side wall 2232. The outer cover plate 224 and the inner cover plate 227 form a cylindrical structure, and define a cavity 4 for accommodating the fuel assembly 3 inside, and support the fuel assembly 3 from two sides.

The longitudinal edges of the outer cover plate 224 are rotatably connected with the bottom wall 2231 and the side wall 2232, so that the outer cover plate can be conveniently disassembled and assembled. Preferably, one side of the outer cover 224 is pivotally attached to a longitudinal side of the bottom wall 2231, the outer cover 224 is removably attached to the outer side of the side wall 2232 remote from the bottom wall 2231, and the receptacle is opened by flipping the outer cover 224 over after the outer cover 224 is detached from the side wall 2232.

The support assembly 22 has a simple structural form, is convenient to assemble and disassemble and is convenient to operate. The complexity of the operation of workers is reduced and reduced during the operation and maintenance process and the loading and unloading process of the fuel assembly.

To accommodate different numbers of fuel assemblies 3, the configuration of the bracket 223 may be adjusted to adjust the number of receiving cavities 4 in the support assembly 22, for example, only one set of outer cover plate 224 and inner cover plate 227 may be provided to form one receiving cavity 4.

As shown in fig. 7, 8, and 9, the outer cover plate 224 is provided with a pressing structure 24 for pressing or releasing the fuel assembly in the cavity 4, after the fuel assembly is loaded into the cavity 4, the pressing structure 24 can press the fuel assembly in the cavity 4, and when the fuel assembly needs to be taken out, the pressing structure 24 is released again, so that the fuel assembly can be taken out.

In some embodiments, the pressing structure 24 includes an adjusting element 241 penetrating through the outer cover plate 224, and a pressing element 242 located inside the outer cover plate 224 and connected to the adjusting element 241, wherein an axial position of the adjusting element 241 is adjustable, and preferably, the adjusting element 241 is screwed with the outer cover plate 224 to drive the pressing element 242 to press or release the fuel assembly 3. The adjusting part 241 can also adjust the axial moving position under the driving of external structures such as a motor.

The outside of outer apron 224 is equipped with along the semi-circular arc supporting beam 2241 of circumference direction setting, and supporting beam 2241 includes one or more, plays the support to outer apron 224. When there are two or more support beams 2241, each support beam 2241 is arranged in the longitudinal direction of the housing chamber 4.

The inboard support frame that is equipped with the outer wall location support to fuel assembly 3 of outer apron 224, the support frame is equipped with first backup pad 2242 with the relative one side in appearance chamber 4, and first backup pad 2242 can carry out the prepositioning to the fuel assembly 3 of putting into appearance chamber 4.

Be equipped with on first backup pad 2242 and supply the mouth of dodging that pressing piece 242 removed to holding the intracavity 4, have certain space between fuel assembly 3 and the first backup pad 2242, pressing piece 242 can compress tightly fuel assembly 3, preferably, and the width that presses piece 242 is greater than the width at a distance from of fuel assembly 3, is convenient for compress tightly fuel assembly 3. In the transportation process, the transverse pressing piece 242 is in direct contact with the grid of the fuel assembly and presses the periphery of the fuel assembly, the main material is made of stainless steel, and a layer of rubber material with certain elasticity is laid on the contact surface of the pressing piece 242 and the grid.

Outer apron 224 is half circular arc, and two support frames have been distributed along circumference to the inboard of outer apron 224, and every support frame extends along the longitudinal direction who holds chamber 4 and sets up. Two locating surfaces of mutually perpendicular are formed on the inboard of inner cover plate 227, are equipped with second backup pad 2243 on the locating surface, and two locating surfaces and two supports form square appearance chamber 4, fix a position fuel assembly 3's both sides.

At least two groups of compression structures 24 are arranged on the region of each support frame corresponding to the outer cover plate 224 along the longitudinal direction of the cavity 4. Preferably, the mounting location of the hold-down structure 24 corresponds to the location of the support beams 2241, such that the support beams 2241 provide support for the hold-down structure to prevent deformation.

First backup pad 2242 includes aluminium corrosion resistant plate, rubber slab, the boron carbide board of range upon range of setting, simultaneously, also covers on two locating surfaces of interior apron 227 has the second backup pad 2243 the same with first backup pad 2242 material. When the outer cover plate 224 is closed, the four aluminum-based boron carbide plates are rectangular in overall appearance, wrap around the fuel assembly, but are not in contact with the fuel assembly, and cover the entire length range of the fuel assembly.

The aluminum-based boron carbide flat plate has stable irradiation resistance and excellent thermal neutron absorption performance, can maintain the subcritical state of the fuel assembly, and avoids radioactive pollution to the external environment. The aluminum-based boron carbide plate covers the fuel assembly 3 from the periphery, the neutron released by the fuel assembly 3 can be well absorbed through the full-covering design, the escape space of the neutron is reduced, and the safety is guaranteed. The full-cladding design can resist high temperature and dust, is not easy to damage the fuel assembly 3, and has long service life.

The outer cover plate 224 can be turned over and opened, the problem that the neutron absorption plate is difficult to mount due to narrow space is solved, the structure is relatively traditional, and the neutron absorption plate is easy to clean and convenient to disassemble and assemble in the maintenance process.

As shown in fig. 10 to 12, a lower end cap 225 is mounted at one end of the support member 22 rotatably connected to the carrier 21, and covers the bottom end of the receiving chamber 4 as a bottom sealing means of the fuel assembly 3 shipping container.

Preferably, the lower cap 225 includes a lower cap body 2251 for covering the bottom of the transport container, and a fastening means 2252 mounted on the lower cap body 2251, and the lower cap body 2251 is detachably coupled to the bracket 223 and the outer cover plate 224.

The clamping device 2252 is mounted on the lower cover 2251, which ensures the integrity of the edge of the lower cover 2251, solves the sealing problem of the fuel assembly compartment, and ensures the tightness of the fuel assembly compartment during transportation. The arc structure of lower lid 2251 outward flange has improved the security, and fastener easy operation has improved the reliability, has guaranteed the fastening of fuel assembly base for lower lid 2251 is under the state that receives the impact, and the atress is more even. The clamping device 2252 may clamp the lower seat of the loaded fuel assembly, making the fuel assembly more stable during transportation. The clamping device 2252 is provided with a cam mechanism, which further improves the simplicity and reliability of the operation, making the process simpler.

The chucking device 2252 includes a chucking mechanism 2253 and an operating mechanism 2254, and the chucking mechanism 2253 includes a chucking member 2255 which is located inside the lower cover 2251 and is reciprocated along the side of the lower cover 2251 at a chucking position and a releasing position.

The operating mechanism 2254 includes an operating portion 2260 for moving the clamping member 2255 to the clamping position, in which the clamping member 2255 is in the clamping position for clamping the lower nozzle of the fuel assembly 3 in the transport container, preventing the fuel assembly 3 from rotating in the receptacle 4.

The operating mechanism 2254 includes an operating lever 2256, a cam plate 2257, a backing plate 2258, and a fastening screw 2259, the operating lever 2256 is rotatably inserted through the lower cover 2251, and the cam plate 2257 is mounted at one end of the operating lever 2256 to rotate with the operating lever 2256.

The other end of the lever 2256 is provided with an operating portion 2260, which allows the lever 2256 to be rotated when the tool is mounted, and allows the cam 2257 to be rotated when the lever 2256 is rotated. In this embodiment, the operating portion 2260 is a square head for engaging with the operating wrench.

The end of the lever 2256 on which the cam disc 2257 is mounted is provided with a keyway in which a key is mounted, and the cam disc 2257 is provided with a slot that snaps onto the key.

The cam plate 2257 is rotatably provided on one side of the lower cover 2251, and the cam plate 2257 and the retainer 2255 are located on the same side of the lower cover 2251. The edge of the cam disc 2257 is provided with an outwardly protruding protrusion 2261, and the locking member 2255 is located on the outer circumference of the cam disc 2257, so that when the operation part 2260 rotates the cam disc 2257, the protrusion 2261 moves the locking member 2255 to the locking position.

Preferably, a plurality of protrusions 2261 are circumferentially distributed on the edge of the cam plate 2257, and the fastening members 2255 are circumferentially distributed on the outer ring of the cam plate and correspond to the positions of the protrusions 2261. As the cam disc 2257 rotates, each projection 2261 moves each catch 2255 outward toward the catch position. The number of the fastening members 2255 may be one, and the fuel assembly 3 may be fastened to the lower pipe holder.

Further, a clamping member 2255 and a cam plate 2257 are provided on the opposite side of the pad 2258 from the lower cover 2251, the pad 2258 is movable toward and away from the lower cover 2251, and the clamping member 2255 is slidably engaged with the pad 2258. When the shim plate 2258 is moved away from the lower cover 2251, the lower seat of the fuel assembly 3 can be pressed tightly. When the shim plate 2258 is close to the lower cover 2251, it is released from the lower seat of the fuel assembly 3.

Preferably, the fastening screw 2259 has a hollow structure, the fastening screw 2259 is screwed to the lower cover 2251, and the operating lever 2256 is inserted through the fastening screw 2259. Backing plate 2258 is attached to the end of fastening screw 2259, and fastening screw 2259 is rotated on lower cover 2251 to adjust the axial position and move backing plate 2258 and clamp 2255 closer to or further away from lower cover 2251.

In other embodiments, rotation of the cam disc 2257 may be caused by a gear mechanism or the like, and axial movement of the backing plate 2258 may be caused by a piston rod or the like.

The locking device 2252 further comprises a plurality of reset members 2262 abutting against the respective locking members 2255, the reset members 2262 providing a spring force to the locking members 2255 moving towards the release position.

The locking mechanism 2253 further comprises a stopper 2263 covering the locking member 2255, and the stopper 2263 is provided with a catch 2264 protruding after the locking member 2255 is moved to the locking position. The fastening means 2255 includes four fastening members, which are disposed at four inner corners of the retaining plate 2263. The retaining plate 2263 is connected with the backing plate 2258, and the clamping member 2255 is located in the space formed by the assembly of the retaining plate 2263 and the backing plate 2258. The stopper 2263 protects the clamping member 2255, the reset member 2262, the backing plate 2258, etc. from damage during the clamping process.

Further, the end of the support member 22 opposite to the loading/unloading port 221 is rotatably connected to the carriage 21 so that the support member 22 can be horizontally placed or erected. Preferably, the lower cover 2251 is provided with a rotating portion 2265 for rotatably engaging the supporting assembly 22 with the carrier 21, and the rotating portion 2265 is generally a rotating shaft, a rotating hole, or both the rotating shaft and the rotating hole, so as to ensure that the lower cover 2251 can be rotatably engaged with the carrier 21. In other embodiments, the bracket 223 may be rotatably engaged with the carrier 21.

As shown in fig. 13, in some embodiments, upper end cap 222 serves as a top cover for the shipping container of fuel assembly 3, and includes a door panel 2221 for covering the upper end of shipping container receptacle 4, and a locking structure mounted on door panel 2221 for axially locking fuel assembly 3 within the shipping container.

The number of the door panels 2221 corresponds to the number of the cavities 4, each door panel 2221 is detachably connected with the bracket 223, and each door panel 2221 covers one of the cavities 4. After the fuel assembly 3 is placed in one of the chambers 4, the fuel assembly 3 can be separately covered. Of course, the upper end cap 222 may be an integral structure, and may simultaneously open and close the loading/unloading port 221 corresponding to each cavity 4.

Further, each door panel 2221 is pivotally connected to the side wall 2232, and the locking structure 2222 on the door panels 2221 axially secures the fuel assembly 3 in place. Meanwhile, each door panel 2221 is also rotatably connected to the bottom wall 2231, and the door panels 2221 are not rotatably connected to the side walls 2232 and the bottom wall 2231 in the same axial direction, i.e., cannot rotate simultaneously. In other embodiments, each door panel 2221 may be pivotally connected to only one of the side walls 2232 and the bottom wall 2231.

Preferably, the locking structure includes a first locking bar 2222 and a second locking bar 2223 which are mounted on the door panel 2221 in an axially adjustable manner, the first locking bar 2222 is located at the middle of the door panel 2221 and is opposite to the center of the upper tube seat of the fuel assembly 3, and the second locking bar 2223 includes a plurality of locking bars which are arranged around the first locking bar 2222 in a central symmetry manner. The first locking bar 2222 and the second locking bar 2223 can be adjusted independently, and can be used for compressing fuel assemblies without related components and compressing fuel assemblies with related components, so that the device is multifunctional, convenient to operate and simple to maintain.

The first lock bar 2222 and the second lock bar 2223 are respectively screwed to the door panel 2221, and can be rotated to adjust the axial position, so that the lower pipe seat is abutted and fixed by the first lock bar 2222 and the second lock bar 2223. The first lock bar 2222 and the second lock bar 2223 are screwed with adjusting nuts at ends far from the transportation container cavity 4, and the adjusting nuts are rotated to drive the first lock bar 2222 and the second lock bar 2223 to move axially to adjust positions.

The end parts of the first locking rod 2222 and the second locking rod 2223 opposite to the transportation container cavity 4 are provided with soft buffer heads 2224, so that the impact during fixing can be reduced, and the lower pipe seat can be prevented from being damaged. Preferably, bumper head 2224 is a soft rubber pad to avoid scraping and rubbing of the end surfaces of the fuel assembly and associated assemblies during use.

Further, the end portions of the first lock bar 2222 and the second lock bar 2223 opposite to the transport container receiving cavity 4 are provided with the pressing block 2225, so that the pressing area can be increased, and the stability can be improved. Buffer head 2224 is mounted on the opposite side of compressing block 2225 from cavity 4, and buffer head 2224 is sleeved on compressing block 2225.

A compression spring is distributed on one side of the upper pipe seat of the fuel assembly 3 opposite to the door panel 2221, and the second locking rod 2223 is opposite to the compression spring on the upper pipe seat of the fuel assembly 3.

The top closing device comprises two door panels 2221 hinged to each other, each door panel 2221 is provided with a locking structure, and each door panel 2221 is opposite to the positions of the cavities 4 for accommodating different fuel assemblies 3 in the transportation container.

Locking structure 2222 includes the lockhole of spiro union on the lockhole and pass the lockhole towards the locking lever that holds the chamber 4 and set up, and the inner of locking lever is equipped with the baffle usually, adjusts the axial position of locking lever, and the baffle leans on with fuel assembly 3 counterbalance, can realize locking fuel assembly 3 axial, prevents to rock in the axial.

In addition, if the lengths of the fuel assemblies 3 are different, the fuel assemblies 3 with different lengths can be axially fixed by using the locking rod after being placed in the cavity 4.

Accordingly, a locking structure 2222 may be provided on the lower cover 2251 to position the end of the fuel assembly 3.

It is to be understood that the above-described respective technical features may be used in any combination without limitation.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The top cover sealing device of the fuel assembly transportation container is characterized by comprising a door plate (2221) used for covering the upper end of the transportation container accommodating cavity and a locking structure which is arranged on the door plate (2221) and used for axially locking a fuel assembly (3) in the transportation container;

the locking structure includes that axial position installs adjustably first locking lever (2222), second locking lever (2223) on door plant (2221), first locking lever (2222) are located the middle part of door plant (2221), and with the upper tube base central point of fuel assembly (3) puts relatively, second locking lever (2223) include two at least, and central symmetry sets up the periphery of first locking lever (2222).

2. The top closure of a fuel assembly shipping container of claim 1, wherein said first locking bar (2222), second locking bar (2223) are each bolted to said door panel (2221).

3. The top closure assembly for a fuel assembly shipping container of claim 2, wherein said first locking bar (2222) and said second locking bar (2223) are threaded with an adjusting nut at an end thereof remote from said shipping container receptacle (4).

4. The fuel assembly shipping container top closure assembly of claim 2, wherein said first and second lock bars (2222, 2223) have soft snub heads (2224) at their ends opposite said shipping container cavity (4).

5. The top closure for a fuel assembly shipping container of claim 4, wherein said buffing head (2224) is a soft gel pad.

6. The top closure for a fuel assembly shipping container of claim 4, wherein said first locking bar (2222), said second locking bar (2223) and said end of said shipping container opposite to said container cavity (4) are provided with a hold-down block (2225), and said bump stop (2224) is mounted on the side of said hold-down block (2225) opposite to said cavity (4).

7. The top closure for a fuel assembly shipping container of claim 6, wherein said bumper head (2224) is sleeved onto said compression block (2225).

8. The top closure of a fuel assembly shipping container according to any of claims 1 to 6, wherein a hold-down spring is distributed on the side of the upper stem of the fuel assembly opposite to the door panel (2221), and the second locking bar (2223) is opposite to the hold-down spring on the upper stem of the fuel assembly.

9. The top closure for a fuel assembly shipping container according to any of claims 1 to 6, wherein said top closure comprises two hinged door panels (2221), each door panel (2221) having said locking structure thereon, each door panel (2221) being positioned opposite to a respective one of said cavities (4) in said shipping container for receiving different fuel assemblies.

10. A fuel assembly shipping container comprising the top closure assembly of any of claims 1 to 9.