WO2020107178A1

WO2020107178A1 - Fuel assembly transport container and outer protective device therefor

Info

Publication number: WO2020107178A1
Application number: PCT/CN2018/117525
Authority: WO
Inventors: 彭云杰; 吴涛; 吴腾; 李其朋; 王超; 吕甜甜; 朱国胜; 胡耀峰; 王弟东; 张春艳; 彭翠玲
Original assignee: 中广核研究院有限公司; 中国广核集团有限公司; 中国广核电力股份有限公司
Priority date: 2018-11-26
Filing date: 2018-11-26
Publication date: 2020-06-04
Also published as: CN212365529U

Abstract

Disclosed are a fuel assembly transport container and an outer protective device therefor. The outer protective device comprises a lower housing (11) and an upper housing (12) mounted on an upper side of the lower housing (11), wherein the lower housing (11) and the upper housing (12) are assembled to form a columnar structure with a horizontally arranged axis; and sides wall of the lower housing (11) and the upper housing (12) are both of a double-layered structure with a hollow sandwich layer. The double-layered structure of the outer protective structure has a relatively high strength and a good performance in terms of thermal insulation, shock absorption and decontaminability, and also satisfies the basic performance requirements for a new fuel assembly transport container.

Description

Fuel assembly transportation container and its outer protective device

Technical field

The present invention relates to the field of nuclear power, and more particularly, to a fuel assembly transportation container and its external protective device.

Background technique

Generally, the outer protective device of the fuel assembly transport container is composed of an upper shell, a lower shell, a bracket assembly and a reinforced bracket provided on the lower side of the lower shell.

After the upper shell and the lower shell are assembled, a cylindrical shaped cavity is formed. The cylindrical volume is filled with foam plastic filler. The filled foam plastic takes up the volume of the container, the process is complicated, and it is not easy to replace; In addition, the upper shell and the lower shell of the container are usually It is a single-layer structure with a single structure and poor strength, which is easily deformed by external impact.

technical problem

The technical problem to be solved by the present invention is to provide a fuel assembly transport container and its outer protective device.

Technical solution

The technical solution adopted by the present invention to solve its technical problems is to construct an outer protective device for a fuel assembly transportation container, including a lower shell and an upper shell mounted on the upper side of the lower shell;

The lower shell and the upper shell are assembled to form a cylindrical structure with the axis horizontally arranged;

The side walls of the lower shell and the upper shell are both double-layer structures with hollow interlayers.

Preferably, the upper shell includes an upper shell, an upper inner shell, and upper end plates provided at both ends. The upper shell and the upper inner shell are spaced apart from each other to form a double-layer structure with a hollow interlayer;

The lower shell includes a lower outer shell, a lower inner shell, and lower end plates provided at both ends. The lower outer shell and the lower inner shell are spaced apart from each other to form a double-layer structure with a hollow interlayer.

Preferably, reinforcing ribs are provided between the upper outer shell and the upper inner shell, and between the lower outer shell and the lower inner shell.

Preferably, between the upper outer shell and the upper inner shell, and between the lower outer shell and the lower inner shell are filled with heat insulation and shock absorbing materials.

Preferably, the shape of the end faces of the lower shell and the upper shell are both polygonal, and adjacent sides of the lower shell and the upper shell are respectively provided with locking and connecting the lower shell and the upper shell to each other Flange side.

Preferably, two ends of the upper shell are provided with a lifting structure for lifting.

Preferably, the hoisting structure is provided with a first hoisting hole.

Preferably, a foot is provided on the lower side of the lower casing, and a second hoisting hole for hoisting is provided on the foot.

Preferably, the lower side of the lower housing is provided with a forklift hole for supporting the forklift after insertion.

A fuel assembly transportation container includes the outer protective device.

Beneficial effect

The fuel assembly transport container and its outer protective device embodying the present invention have the following beneficial effects: the double-layer structure of the outer protective structure has high strength and excellent thermal insulation, shock absorption, and decontamination performance, and meets the transportation of new fuel assemblies The basic performance requirements of the container.

Further, the double-layer structure is filled with heat-insulating and shock-absorbing materials, which can effectively reduce the impact of the vibration and external impact on the components in the container when the container is dropped, and at the same time reduce the conduction of heat to the inside of the shell during fire conditions.

BRIEF DESCRIPTION

The present invention will be further described below with reference to the drawings and embodiments. In the drawings:

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

FIG. 2 is a schematic structural view of the support assembly of the fuel assembly transport container in FIG. 1 when standing up;

FIG. 3 is a schematic diagram of the upper case in FIG. 1 after opening;

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

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

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

7 is a schematic diagram of a cover plate of the support assembly in FIG. 4 when turned over;

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

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

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

11 is a schematic cross-sectional view of the lower end cover in FIG. 10;

12 is a schematic perspective view of the baffle in FIG. 11 when opened;

13 is a perspective schematic view of the upper end cover in FIG. 4.

Best Mode of the Invention

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.

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

The carrier 21 is installed inside the housing 1, and the support assembly 22 is installed on the carrier 21. Two support chambers 4 for accommodating and fixing the fuel assembly 3 are formed in the support assembly 22. The fuel assembly 3 is usually a columnar structure. The support assembly 22 can drive the fuel assembly 3 in the chamber 4 to be placed horizontally or erected.

The other end of the support assembly 22 is provided with a loading and unloading port 221. When the supporting assembly 22 is erected, the loading and unloading port 221 is located at the upper end of the chamber 4 for the fuel assembly 3 to be inserted into the chamber 4 from the loading and unloading port 221 in the axial direction, or from the chamber 4 Pull out the loading and unloading port 221 in the axial direction.

The end opposite to the loading and unloading port 221 in the chamber 4 is provided with a lower end cover 225 for positioning the fuel assembly 3 circumferentially. The loading and unloading port 221 is provided with a cover for the chamber 4 and axial positioning of the fuel assembly 3 in the chamber 4的上端盖222.

The support assembly 22 can be rotated in a horizontal state and a vertical state under the action of a crane. When the support assembly 22 is in a vertical state, it is convenient to hang the fuel assembly 3 vertically into the cavity 4 and to facilitate the installation of the fuel assembly 3 The support assembly 22 rotates to a horizontal state. The loading process of the fuel assembly 3 is simpler and faster, and the loading efficiency is improved. After the support assembly 22 and the fuel assembly 3 are placed horizontally at the same time, they are accommodated in the transport container, which can facilitate the transportation of the fuel assembly 3.

After the fuel assembly 3 is placed in the cavity 4 and before the upper end cap 222 is closed, the fuel assembly 3 is positioned circumferentially, preventing rotation in the cavity 4. After capping the upper end cap 222, the fuel assembly 3 can be axially positioned again to prevent longitudinal movement in the cavity 4 to achieve full restraint of the fuel assembly 3 and prevent shaking in the cavity 4 during transportation to improve transportation. Safety and stability.

As shown in FIG. 5, in general, the housing 1 includes a lower housing 11 and an upper housing 12 installed on the upper side of the lower housing 11. The lower housing 11 and the upper housing 12 are assembled to form a columnar structure with a horizontal axis arranged for easy loading For transportation, in this embodiment, the columnar structure is an octagonal column shape. Of course, the outer shape of the housing 1 may also be a square columnar structure with a horizontal axis.

The side walls of the lower shell 11 and the upper shell 12 are both double-layer structures with hollow interlayers, which allows the outer shell to have high impact strength and excellent thermal insulation, shock absorption, and decontamination performance.

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

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 are filled with heat insulation and damping materials. The double-layer structure is filled with heat-insulation and shock-absorbing materials, which can effectively reduce the impact of the vibration and external impact on the components in the container when the container is dropped, and at the same time reduce the conduction of heat to the inside of the shell during fire conditions. The heat-insulation and shock-absorbing materials can be formed and filled into the polygonal double-layer structure of the upper shell and the lower shell, which is small and easy to replace; at the same time, multiple sets of fuel assemblies can be contained in the container.

Further, reinforcing ribs 13 are provided 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, which can enhance the strength of the outer shell 1 and prevent deformation during lifting and transportation. Improve the ability to resist impact.

As shown in FIGS. 2 to 4, in some embodiments, the two ends of the upper casing 12 are provided with tabs 121 protruding from the side of the lower casing 11, and the inner end of the lower casing 11 is provided with A card slot 111 into which the card tongue 121 snaps. The tab 121 includes a steel plate and a cork wrapped around the steel plate, which can not only ensure the strength, but also play a role in buffering and damping.

When the upper casing 12 is installed to the lower casing 11, the tab 121 is snapped into the slot 111 to facilitate positioning between the two. The outer shapes of the end surfaces of the lower shell 11 and the upper shell 12 are polygonal, and an octagonal structure is formed after assembly. The adjacent sides of the lower shell 11 and the upper shell 12 are respectively provided with a lower shell 11 and an upper shell 12 Flanges connected to each other. The edges of the upper casing 12 and the lower casing 11 are respectively provided with flange edges, which can lock and fix the upper casing 12 and the lower casing 11.

Both ends of the upper casing 12 are provided with a hoisting structure for hoisting, and the hoisting structure is provided with a first hoisting hole 125. The lower side of the lower case 11 is provided with legs, and the legs are provided with first hoisting holes 115 for hoisting. The lower side of the lower case 11 is also provided with a forklift hole 116 for supporting the forklift after insertion. There are multiple lifting methods of lifting holes and forklift holes 116 to make lifting more convenient.

2-6, preferably, a buffer structure 14 elastically connected to the lower housing 11 is provided on the side of the carrier 21, so that the carrier 21 is suspended in the lower housing 11, and the suspension and elastic connection can be Reduce the external impact on the carrier 21. The buffer structure 14 can absorb the impact transmitted by the outer shell 1 to the carrier 21 and avoid impact on the fuel assembly 3.

In some embodiments, the buffer structure 14 includes several buffer members 141 distributed on the side of the carrier 21 and connected between the lower shell 11. The cushioning member 141 serves as a shock absorber to cushion the fuel assembly to avoid shocks. Generally, the cushioning member 141 is distributed on the longitudinal side of the carrier 21, and the cushioning member 141 may also be distributed on each side.

The cushioning member 141 includes a shock absorbing body 1411 having elasticity, a top plate 1412 and a bottom plate 1413 disposed at opposite ends of the shock absorbing 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 absorbing body 1411. The first embedded portion 1414 and the second embedded portion 1415 are provided with a The inverted structure of the shock absorbing body 1411 makes the connection between the shock absorbing body 1411 and the top plate 1412 and the bottom plate 1413 firmer.

The first inlay portion 1414 and the second inlay portion 1415 improve the shear performance of the shock absorbing body 1411, so that the shape change of the shock absorbing body 1411 is small, and the service life is improved.

The top plate 1412 and the bottom plate 1413 are respectively connected to the inner wall of the carrier 21 and the lower housing 11 and fixedly connected to the carrier 21 and the lower housing 11. The buffer body is interposed between the carrying frame 21 and the housing 1 to play a role of buffering and preventing vibration. In other embodiments, the shock absorbing body 1411 may also be a structure such as a spring or an elastic sheet.

The first embedded portion 1414 includes a first embedded section 1416 and a second embedded section 1417 that are connected in sequence. The end of the first embedded section 1416 away from the second embedded section 1417 is connected to the top plate 1412. The shock absorbing body 1411 falls off.

In this embodiment, the first embedding section 1416 and the second embedding section 1417 are both cylindrical, and the cross-sectional shape of the second embedding section 1417 is larger than that of the first embedding section 1416, allowing the step difference between the two sections to form an undercut .

The shock absorbing body 1411 is provided with a through hole in the middle. The connection hole includes a first hole segment and a second hole segment. The cross-sectional size of the second hole segment is larger than that of the first hole segment. The first embedding section 1416 is inserted into the first hole section, and the second embedding section 1417 is located in the second hole section and embedded into the inner wall surface of the second hole section.

A bolt is screwed in the middle of the top plate 1412 and can be connected to the carrier 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, which is convenient for assembly and positioning and makes the stress more balanced.

The connecting hole is located in the middle of the shock absorbing body 1411. The connecting hole allows the middle of the shock absorbing body 1411 to form a hollow structure, reducing the weight of the shock absorbing body 1411, saving materials, and improving the shock absorbing performance of the shock absorbing body 1411.

A through hole corresponding to the second hole segment is provided in the middle of the bottom plate 1413 to allow the connection hole to communicate with the outside.

The second inlay portion 1415 includes a third inlay section 1418 and a fourth inlay section 1419 connected in sequence. An end of the third inlay section 1418 away from the fourth inlay section 1419 is connected to the bottom plate 1413. The fourth inlay section 1419 forms an undercut prevention and The shock absorbing body 1411 falls off.

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

The first embedded portion 1414 and the second embedded portion 1415 may also be distributed to include a plurality of sheet-like structures distributed along the circumferential direction embedded in the shock absorbing body 1411, and the ends of the sheet-like structures are bent to form an undercut.

The top plate 1412 and the bottom plate 1413 respectively cover the end surfaces of both ends of the damping body 1411 where the damping body 1411 is clamped. The bottom plate 1413 is distributed with a number of connecting holes. After the locking fastener is inserted, it is connected and fixed with the housing 1 for easy disassembly.

The top plate and the bottom plate are embedded in the shock absorbing body 1411, the connection is more firm, the connection problem of the shock absorbing body 1411 and the steel plate is solved, and the steel top plate, the bottom plate and the rubber shock absorbing body 1411 are connected more firmly. A steel inner lining plate is embedded in the shock absorbing body 1411, which further improves the elasticity and shearing performance of the shock absorbing body 1411, and increases the service life of the shock absorbing body 1411.

As shown in FIG. 3, further, a support arm 23 is provided between the support assembly 22 and the carrier 21, which can support the support assembly 22 when the support assembly 22 is placed vertically, preventing the process of loading the fuel assembly 3 Tilted.

The support arm 23 is rotatably connected to the support assembly 22, and the carrier 21 is provided with a guide rail 211 provided in the longitudinal direction. The support arm 23 and the guide rail 211 are slidingly fitted. .

The engaging structure includes an engaging member swingable toward the upper side of the guide rail 211, and an elastic member that provides elasticity to keep the engaging member on the upper side of the guide rail 211.

During the erecting of the support assembly 22, the support arm 23 moves on the guide rail 211 to press the engaging member to the guide rail 211. After the supporting assembly is erected, the supporting arm 23 is separated from the engaging member, and the engaging member is reset to the upper side of the guide rail 211. The engaging member resists the engaging of the supporting arm 23 to position the supporting assembly 22 and prevent the supporting assembly 22 from The role of flipping down. After the fuel assembly 3 is inserted into the support assembly 22, the engagement member is pressed down under the guide rail 211 to release the resistance to the support arm 23, and the support arm 23 slides in the reverse direction through the engagement member to receive the support assembly 22 side.

With reference to FIGS. 4, 5 and 7, in some embodiments, the support assembly 22 includes a bracket 223 and an outer cover 224, an inner cover 227, and a lower end cover 225 that together define the cavity 4. Preferably, the bracket 223 extends along the longitudinal direction of the cavity 4, and the cross section of the bracket 223 is T-shaped, including a bottom wall 2231 and a side wall 2232 provided on 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 the outer side of the bottom wall 2231 and the two longitudinal sides of the bottom wall 2231. Two sides of 2232 define two chambers 4 for accommodating the fuel assembly 3, and the portions of the outer cover plate 224 and the inner cover plate 227 corresponding to the respective chambers 4 are semi-circular arcs.

The outer cover plate 224 of the arc-shaped structure can increase the strength of the outer cover plate 224 and is more stable when it encounters rollover or falling impacts, it can avoid the impacts and protect the internal fuel assembly 3. The outer cover plate 224 of circular arc structure has a compact structure, which reduces the requirements for the external loading structure.

Preferably, each cavity 4 is correspondingly provided with an outer cover plate 224, so that both sides of the arc-shaped outer cover plate 224 and the side wall 2232 are away from the outer edge of the bottom wall 2231 and connected to a longitudinal edge of the bottom wall 2231.

At the same time, the inner cover plate 227 is disposed in the angle formed by the bottom wall 2231 and the side wall 2232. Preferably, a supporting plate 228 supporting the inner cover plate 227 is provided in the angle between 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 chamber 4 for accommodating the fuel assembly 3 inside, and support the fuel assembly 3 from both sides.

The longitudinal edges of the outer cover plate 224 are rotatably connected with the bottom wall 2231 and the side wall 2232, which is convenient for disassembly and assembly. Preferably, one side of the outer cover 224 is rotatably connected to the longitudinal side of the bottom wall 2231, the outer cover 224 and the side wall 2232 are detachably connected to the outer side away from the bottom wall 2231, and after the outer cover 224 and the side wall 2232 are disassembled, they are turned The outer cover 224 opens the cavity.

The support assembly 22 has a simple structure, which is convenient for loading and unloading and convenient for operation. In the operation and maintenance process and in the process of loading and unloading the fuel assembly, the operation complexity of the staff is reduced and reduced.

In order to load different numbers of fuel assemblies 3, the structure of the bracket 223 can be adjusted so that the number of the chambers 4 on the support assembly 22 is adjusted accordingly. For example, only one set of outer cover plate 224 and inner cover plate 227 are formed to form one chamber 4.

7, 8 and 9, the outer cover plate 224 is provided with a pressing structure 24 that presses or loosens the fuel assembly in the chamber 4. After the fuel assembly is inserted into the chamber 4, the pressing structure 24 The structure 24 can compress the fuel assembly in the cavity 4. When it needs to be taken out, the compressing structure 24 can be loosened again to allow the fuel assembly to come out.

In some embodiments, the pressing structure 24 includes an adjusting member 241 passing through the outer cover plate 224, and a pressing member 242 located inside the outer cover plate 224 and connected to the adjusting member 241. The axial position of the adjusting member 241 is adjustable Preferably, the adjusting member 241 is screwed with the outer cover 224 to drive the pressing member 242 to press or loosen the fuel assembly 3. The adjusting member 241 can also adjust the axial movement position driven by an external structure such as a motor.

The outer cover plate 224 is provided with a semi-circular arc-shaped support beam 2241 provided along the circumferential direction. The support beam 2241 includes one or more supports for the outer cover plate 224. When there are two or more support beams 2241, the support beams 2241 are arranged along the longitudinal direction of the cavity 4.

A support frame for positioning and supporting the outer wall surface of the fuel assembly 3 is provided on the inner side of the outer cover plate 224, and a side of the support frame opposite to the cavity 4 is provided with a first support plate 2242, which can fit into the cavity 4 The fuel assembly 3 is pre-positioned.

The first support plate 2242 is provided with an escape opening for the pressing member 242 to move into the cavity 4. There is a certain space between the fuel assembly 3 and the first support plate 2242. The pressing member 242 can press the fuel assembly 3 Tight, preferably, and the width of the pressing member 242 is larger than the width of the partition of the fuel assembly 3, which is convenient for pressing the fuel assembly 3. During transportation, the lateral pressing member 242 is in direct contact with the fuel assembly grid and presses around the fuel assembly. The main material is stainless steel, and the pressing member 242 lays a layer of rubber with a certain elasticity on the contact surface with the grid material.

The outer cover plate 224 has a semicircular arc shape, and two support frames are distributed on the inner side of the outer cover plate 224 along the circumferential direction, and each support frame extends along the longitudinal direction of the cavity 4. Two positioning surfaces perpendicular to each other are formed on the inner side of the inner cover plate 227, and a second support plate 2243 is provided on the positioning surface. The two positioning surfaces and the two support frames form a square-shaped cavity 4, which is opposite to the fuel assembly 3 on both sides. Positioning.

At least two sets of pressing structures 24 are arranged along the longitudinal direction of the cavity 4 on the area corresponding to the outer cover 224 of each support frame. Preferably, the installation position of the pressing structure 24 corresponds to the position of the supporting beam 2241, so that the supporting beam 2241 provides support for the pressing structure to prevent deformation.

The first support plate 2242 includes laminated aluminum stainless steel plates, rubber plates, and base boron carbide plates. At the same time, the two positioning surfaces of the inner cover plate 227 are also covered with a second support plate 2243 of the same material as the first support plate 2242 . When the outer cover plate 224 is closed, the overall shape of the four aluminum-based boron carbide plates is a rectangular parallelepiped, which is wrapped around the fuel assembly, but does not contact the fuel assembly, covering the entire length of the fuel assembly.

The aluminum-based boron carbide flat plate has stable radiation resistance and excellent thermal neutron absorption performance, can maintain the subcritical state of the fuel assembly, and avoid causing radioactive pollution to the external environment. The aluminum-based boron carbide plate covers the fuel assembly 3 from all sides. The fully-covered design can well absorb the neutrons released by the fuel assembly 3, reduce the neutron escape space, and ensure safety. The fully covered design can withstand high temperature, dust, and is not easy to damage the fuel assembly 3, and has a long service life.

The outer cover 224 can be flipped open, which also solves the problem of difficulty in installing the neutron absorbing plate due to the small space. The structure is relatively traditional, easy to clean, and easy to disassemble during maintenance.

10 to 12, the lower end cover 225 is installed at the end of the support assembly 22 and the carrier 21 that is rotatably connected, and covers the bottom end of the chamber 4 as a bottom sealing device for the transportation assembly of the fuel assembly 3.

Preferably, the lower end cover 225 includes a lower cover body 2251 for covering the bottom of the transport container, and a clamping device 2252 mounted on the lower cover body 2251. The lower cover body 2251 is detachably connected to the bracket 223 and the outer cover plate 224.

The clamping device 2252 is installed 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 during transportation. The arc-shaped structure of the outer edge of the lower cover 2251 improves safety, the fastening device is easy to operate, improves reliability, and ensures the fastening of the fuel assembly base, making the lower cover 2251 more stressed under impact Evenly. The clamping device 2252 can clamp the lower tube seat of the loaded fuel assembly, so that the fuel assembly is more stable during transportation. The clamping device 2252 is provided with a cam transmission mechanism, which further improves the simplicity and reliability of the operation and makes the processing easier.

The clamping device 2252 includes a clamping mechanism 2253 and an operating mechanism 2254. The clamping mechanism 2253 includes a clamping member that is located inside the lower cover 2251 and can reciprocate along a side of the lower cover 2251 in a clamping position and a release position 2255.

The operating mechanism 2254 includes an operating portion 2260 for driving the clamping member 2255 to the clamping position. When the clamping member 2255 is in the clamping position, it clamps the lower tube seat of the fuel assembly 3 in the transport container to prevent the fuel assembly 3 from being contained. Rotate in the cavity 4.

The operating mechanism 2254 includes a joystick 2256, a cam plate 2257, a backing plate 2258, and a tightening screw 2259. The joystick 2256 rotatably penetrates the lower cover 2251. The cam plate 2257 is installed at one end of the joystick 2256 and rotates with the joystick 2256 .

The other end of the joystick 2256 is provided with an operation part 2260 for driving the joystick 2256 to rotate after the tool is installed. When the joystick 2256 is rotated, the cam plate 2257 is rotated. In this embodiment, the operation part 2260 is a square head, which is used to buckle with an operation wrench.

The lever 2256 is provided with a key slot at the end where the cam disc 2257 is installed, a key is installed in the key slot, and a cam slot is provided on the cam disc 2257 to be engaged with the key.

The cam plate 2257 is rotatably provided on one side of the lower cover 2251, and the cam plate 2257 and the clamping member 2255 are located on the same side of the lower cover 2251. The cam disc 2257 is provided with an outwardly protruding protrusion 2261, and the clamping member 2255 is located on the outer ring of the cam disk 2257, so that when the operating portion 2260 drives the cam disk 2257 to rotate, the protrusion 2261 drives the clamping member 2255 to the clamping position mobile.

Preferably, a plurality of protrusions 2261 are distributed on the edge of the cam disc 2257 in the circumferential direction, and the clamping members 2255 are distributed on the outer ring of the cam plate in the circumferential direction, and correspond to the positions of the protrusions 2261. When the cam plate 2257 rotates, each protrusion 2261 pushes each clamping member 2255 outward to move to the clamping position. The number of the clamping member 2255 can also be one, which clamps and fixes the lower tube seat of the fuel assembly 3.

Further, the clamping member 2255 and the cam plate 2257 are disposed on a side of the backing plate 2258 opposite to the lower cover 2251, the backing plate 2258 can move closer to or away from the lower cover 2251, and the clamping part 2255 can slide with the backing plate 2258 cooperation. When the shim plate 2258 is away from the lower cover 2251, the lower tube seat of the fuel assembly 3 can be pressed tightly. When the shim plate 2258 approaches the lower cover 2251, it releases from the lower tube base of the fuel assembly 3.

Preferably, the tightening screw 2259 is a hollow structure, the tightening screw 2259 is screwed to the lower cover 2251, and the operating rod 2256 is penetrated by the tightening screw 2259. The backing plate 2258 is installed at the end of the tightening screw 2259, and the tightening screw 2259 rotates on the lower cover 2251 to adjust the axial position to drive the backing plate 2258 and the clamping member 2255 closer to or away from the lower cover 2251.

In other embodiments, the rotation of the cam plate 2257 can be driven by a gear mechanism or the like, and the axial movement of the pad 2258 can also be driven by a piston rod or the like.

The clamping device 2252 further includes a plurality of resetting members 2262 that respectively abut against the clamping members 2255. The resetting member 2262 provides the clamping member 2255 with an elastic force to move toward the release position.

The clamping mechanism 2253 further includes a baffle 2263 covering the clamping member 2255, and the baffle 2263 is provided with a bayonet 2264 for the clamping member 2255 to extend after moving to the clamping position. The clamping member 2255 includes four, distributed at the inner four corners of the baffle 2263. The baffle 2263 is connected to the backing plate 2258, and the clamping member 2255 is located in the space formed by the baffle 2263 and the backing plate 2258. The baffle 2263 can protect the clamping member 2255, the resetting member 2262 and the backing plate 2258, etc., to prevent damage during the clamping process.

Further, the end of the support assembly 22 opposite to the loading and unloading port 221 is rotatably connected to the carrier 21 so that the support assembly 22 can be placed horizontally or erected. Preferably, the lower cover 2251 is provided with a rotation part 2265 for the rotation of the support assembly 22 and the carrier 21, and the rotation part 2265 is usually a rotation shaft or a rotation hole, or the rotation shaft and the rotation hole are provided at the same time to ensure that The cover 2251 can be rotated and matched with the carrier 21. In other embodiments, the bracket 223 and the carrier 21 can also be rotated to cooperate.

As shown in FIG. 13, in some embodiments, the upper end cap 222 serves as a top capping device for the transport container of the fuel assembly 3, and includes a door panel 2221 for covering the upper end of the transport container compartment 4 and a door panel 2221 mounted on the door panel 2221. A locking structure for the axial locking of the fuel assembly 3 in the transport container.

The number of the door panels 2221 corresponds to the number of the cavity 4, each door panel 2221 is detachably connected to the bracket 223, and each door panel 2221 covers one of the cavity 4 respectively. After the fuel assembly 3 is installed in one of the chambers 4, the fuel assembly 3 can be capped separately. Of course, the upper end cover 222 may also be an integrated structure, which can simultaneously open and close the loading and unloading ports 221 corresponding to the respective cavity 4.

Further, each door panel 2221 is connected to the side wall 2232 in rotation, and the locking structure 2222 on the door panel 2221 fixes the fuel assembly 3 axially. At the same time, each door panel 2221 is also rotationally connected to the bottom wall 2231 respectively, and the axis direction of the rotational connection of the door panel 2221 and the side wall 2232 and the bottom wall 2231 is different, that is, they cannot be rotated at the same time. In other embodiments, each door panel 2221 may also be rotatably connected to only one of the side wall 2232 and the bottom wall 2231.

Preferably, the locking structure includes a first lock lever 2222 and a second lock lever 2223 that are axially adjustable on the door panel 2221, and the first lock lever 2222 is located in the middle of the door panel 2221 and is connected to the upper tube of the fuel assembly 3 The center positions of the seats are opposite, the second lock lever 2223 includes a plurality of pieces, and the centers are symmetrically arranged on the circumference of the first lock lever 2222. The first lock lever 2222 and the second lock lever 2223 can be adjusted independently, which can be used to compress the fuel assembly without related components, as well as the fuel assembly with related components, multi-functional use, the device is easy to operate , Simple maintenance.

The first lock lever 2222 and the second lock lever 2223 are screwed to the door panel 2221, respectively, and can be rotated to adjust the axial position, so that the first lock lever 2222 and the second lock lever 2223 tightly fix the lower tube seat. An adjustment nut is screwed to the ends of the first lock lever 2222 and the second lock lever 2223 that are away from the transport container cavity 4, and turning the adjustment nut drives the axial movement of the first lock lever 2222 and the second lock lever 2223 to adjust the adjustment position.

The ends of the first lock lever 2222 and the second lock lever 2223 opposite to the transport container cavity 4 are provided with a soft buffer head 2224, which can reduce the impact during fixing and prevent damage to the lower tube base. Preferably, the buffer head 2224 is a soft rubber pad to avoid scratching the end surfaces of the fuel assembly and related assemblies during use.

Further, the end portions of the first lock lever 2222 and the second lock lever 2223 opposite to the transport container cavity 4 are provided with a pressing block 2225, which can increase the area of pressure and increase stability. The buffer head 2224 is installed on a side of the pressing block 2225 opposite to the cavity 4, and the buffer head 2224 is sleeved on the pressing block 2225.

A compression spring is distributed on the side of the upper tube seat of the fuel assembly 3 opposite to the door plate 2221, and the second lock lever 2223 is opposite to the compression spring on the upper tube seat of the fuel assembly 3.

The top capping device includes two door panels 2221 hinged to each other, each door panel 2221 is provided with a locking structure, and each door panel 2221 is located opposite to the cavity 4 of the fuel container 3 in the transport container.

The locking structure 2222 includes a lock rod screwed on the lock hole and disposed toward the cavity 4 through the lock hole. The inner end of the lock rod is usually provided with a baffle plate to adjust the axial position of the lock rod. The baffle plate and the fuel assembly When the three parts are in contact, the fuel assembly 3 can be axially locked to prevent shaking in the axial direction.

In addition, if the lengths of the fuel assemblies 3 are different, the fuel rods 3 of different lengths can also be fixed axially after being inserted into the cavity 4 by the lock lever.

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

Understandably, the above technical features can be used in any combination without limitation.

The above are only the embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by the description and drawings of the present invention, or directly or indirectly used in other related technical fields, The same reason is included in the patent protection scope of the present invention.

Claims

An external protection device for a fuel assembly transport container, characterized in that it includes a lower casing (11) and an upper casing (12) installed on the upper side of the lower casing (11);

The lower shell (11) and the upper shell (12) are assembled to form a cylindrical structure with the axis horizontally arranged;

The side walls of the lower shell (11) and the upper shell (12) are both double-layer structures with hollow interlayers.
The outer shielding device of a fuel assembly transport container according to claim 1, wherein the upper shell (12) includes an upper outer shell (122), an upper inner shell (123), and upper ends provided at both ends A plate (124), the upper outer shell (122) and the upper inner shell (123) are spaced from each other to form a double-layer structure with a hollow interlayer;

The lower shell (11) includes a lower outer shell (112), a lower inner shell (113), and lower end plates (114) provided at both ends, the lower outer shell (112), the lower inner shell (113) Spaced apart from each other to form a double-layer structure with a hollow interlayer.
The outer protection device of the fuel assembly transport container according to claim 2, characterized in that, between the upper outer shell (122) and the upper inner shell (123), and the lower outer shell (112) and the lower inner shell ( 113) Reinforcing ribs (13) are provided between them.
The outer protective device of a fuel assembly transport container according to claim 2 or 3, characterized in that, between the upper outer shell (122) and the upper inner shell (123), and the lower outer shell (112) and the lower inner The shells (113) are filled with thermal insulation and shock absorption materials.
The outer protective device of a fuel assembly transport container according to claim 1, characterized in that the outer shapes of the end faces of the lower shell (11) and the upper shell (12) are both polygonal, and the lower shell (11) The adjacent sides of the upper shell (12) are respectively provided with flange sides that connect and lock the lower shell (11) and the upper shell (12) to each other.
The outer shielding device of a fuel assembly transport container according to claim 1, characterized in that both ends of the upper casing (12) are provided with a lifting structure for lifting.
The external protection device of a fuel assembly transport container according to claim 6, wherein the hoisting structure is provided with a first hoisting hole (125).
The external protection device of a fuel assembly transport container according to claim 1, wherein a support foot is provided on the lower side of the lower case, and a second lifting hole for lifting is provided on the support foot.
The outer protection device of a fuel assembly transport container according to claim 1, characterized in that a forklift hole (116) for supporting the forklift after insertion is provided on the lower side of the lower casing (11).
A fuel assembly transportation container, characterized by comprising the outer protection device according to any one of claims 1 to 9.