JPH0530239B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transportation container for a fuel assembly for a nuclear reactor.

For example, a transportation container for a nuclear reactor fuel assembly includes a halved cylindrical lower container formed from a mild steel plate and closed at both ends, and a halved cylindrical upper lid that is tightened and fixed to the lower container, Two fuel assemblies are arranged in parallel inside the fuel assembly with a buffer member interposed therebetween.
Constructions adapted to accommodate the body are known.

Two containers are loaded on each truck for transportation, so the number of fuel assemblies transported by one truck is four.

By the way, with the rapid development of nuclear power generation, the transportation volume of fuel assemblies used in it is also increasing significantly, and ensuring economical transportation and safety during transportation of fuel assemblies has become an urgent issue. has been done.

However, the Road Traffic Act regulates the dimensions and weight of the entire vehicle, including the mounted items.
It is necessary to economically increase the transportation amount of fuel assemblies within this regulatory range and to improve safety during transportation.

This invention was made in view of the above-mentioned circumstances, and by storing four fuel assemblies in one transport container, the amount of fuel assemblies transported can be economically reduced within the scope of the regulations of the Road Traffic Act. It is an object of the present invention to provide a fuel assembly transportation container that can greatly increase the fuel assembly capacity and improve the safety during transportation.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
This will be explained based on the diagram.

In FIG. 1, reference numeral 1 indicates a fuel assembly transport container (hereinafter abbreviated as transport container) according to this embodiment,
The outer shell 2 of the transportation container 1 is composed of a lower container 3 in the shape of a half-split square tube with both ends closed, and an upper lid 4 fastened to the lower container 3 with bolts 2a.

The lower container 3 and the upper lid 4 each include an outer shell steel plate 5, an inner shell steel plate 6, and a heat insulating buffer material 7 filled between them.

The heat insulating cushioning material 7 is made of, for example, wood, synthetic resin, or inorganic material, and its thickness t is determined in consideration of the heat resistance and impact resistance required of the transport container 1.

Inside the lower container 3, a mount frame 8 formed in the shape of a ladder is connected to the lower container 3 on both sides.
It is suspended by a mount 9 made of a cushioning member such as rubber attached to the inner wall of the mount 9.

On the upper surface of the mount frame 8, a cross frame 10 having a cruciform cross section is disposed on the upper surface of the mount frame 8.
is parallel to the mount frame 8, and one (lower in FIG. 1) end 12a of the vertical frame 12 is attached to the mount frame 8 so that it can be attached to and removed from the mount frame 8.

Further, on both the left and right sides of the mount frame 8 in FIG. , corresponds to the back side),
A pin-shaped holding fitting 13 is attached to each,
A support column 14 is rotatably attached to these holding fittings 13 at their lower ends.

On the other hand, a mounting bracket 15 is rotatably attached to the upper end of each of the support columns 14 via a pin-shaped connecting bracket 13a.
are detachably connected to both ends of the horizontal frame 11, respectively.

Brackets 16 and 1 are provided at the other (upper in FIG. 1) end of the vertical frame 12 of the cross frame 10 and at both ends of the horizontal frame 11, respectively.
7 is installed.

Each of these brackets 16 and 17 has the same structure, and is composed of a channel steel fixed to the cross frame 10 and a bearing attached to the channel steel.

A pair of first fixing frame members 1 are attached to the bracket 16 attached to the upper end of the vertical frame 12.
8 is rotatably attached, and second fixing frame members 19 are rotatably attached to brackets 17 provided at both ends of the horizontal frame 11, respectively.

The first fixing frame member 18 and the second fixing frame member 19 each form a pair, and each has a bolt 20 and a nut 21 at its end on the rotation side.
are removably connected to each other, and in the connected state, constitute a fixing frame 22 that cooperates with the vertical frame 12 and the horizontal frame 11 to form a space for accommodating a fuel assembly 34, which will be described later. It's becoming like that.

Further, a threaded rod 23 is provided in the intermediate portion of each of the fixing frame members 18 and 19 so as to protrude into the space.
are attached so that their positions can be adjusted, and a holding member 25 having a pad 24 that is brought into contact with the side surface of the fuel assembly 34 is rotatably attached to the end of each threaded rod 23 on the space side. It is being

Further, the lower end 12a of the vertical frame 12
Notch grooves 26 are formed in the direction along the horizontal frame 11 on both sides of predetermined locations, and each of these notch grooves 26
A bent portion of an L-shaped auxiliary frame 27 is loosely fitted into the frame, and is rotatably connected to the end of the vertical frame 12 at this bent portion.

At both ends of each of the auxiliary frames 27, there are brackets 28 having the same structure as the brackets 16 and 17.
29 are attached and each of these brackets 2
8, 29, a third fixing frame member 30 having the same configuration as the first and second fixing frame members 18, 19;
A fourth fixing frame member 31 is rotatably attached.

These third and fourth fixing frame members 30 and 31 are connected by bolts 20 and nuts 21 at their respective rotating ends, and in the connected state, they are connected to the horizontal frame 11. In cooperation with the vertical frame 12, a fixing frame 32 is configured on both sides of the lower part of the vertical frame 12 to form a space for accommodating the fuel assembly 34.

Further, a threaded rod 23 is attached to the intermediate portion of each of the third and fourth fixing frame members 30 and 31 so as to protrude into the space, and the position of each of these threaded rods 23 can be adjusted. A pressing member 25 having a pad 24 that is brought into contact with the side surface of the fuel assembly 34 is rotatably attached to the end on the space side.

Further, on both sides of the upper part of the vertical frame 12, a portion extending from each side surface to the side surface of the horizontal frame 11 via the upper surface of the horizontal frame 11, and on the inner surface of each of the auxiliary frames 27, B, which has a high neutron absorption effect, are provided. A radiation shielding member 33 made of Cd or the like is fixed.

This radiation-resistant member 33 is a fuel assembly 3
This is provided in order to reduce the critical limit distance between 4 and to suppress the increase in size of the transport container.

Next, the operation of the transport container 1 configured in this way will be explained.

First, the procedure for accommodating the fuel assembly 34 will be explained.

(1) Place the transport container 1 in the specified position and tighten the bolts 2a.
is removed, and the upper lid 4 is lifted up by a crane or the like and removed from the lower container 3.

(2) By releasing the connection between the mounting bracket 15 and the support column 14, the cross frame 10 is released from the mount frame 8 and the support column 14.

(3) The cross frame 10 is erected within the lower container 3 and held vertically by a support member (not shown).

(4) Remove each bolt 20 and nut 21,
Open the pair of fixing frames 22 on the upper side of the cross frame 10.

(5) Lift the fuel assembly 34 using a crane or the like and insert it into each of the free fixing frames 22.

(6) Rotate the fixing frame members 18 and 19 so that they approach each other, and bring the presser members 25 attached to each one into contact with the side surface of the support grid of the fuel assembly 34 while holding each fixing frame 22 close,
Next, each fixing frame member 18, 19 is attached to the bolt 2.
0, connected by nut 21.

As a result, the fuel assembly 34 is held at two positions on both sides of the upper part of the cross frame 10 in a state where it is pressed from all sides by the pressing member 25 and the radiation-resistant member 33.

(7) Next, by rotating each auxiliary frame 27 by 45 degrees from the state shown in FIG. 1, each of these auxiliary frames 27 is made to protrude outward from the cross frame 10 as shown in FIG. , remove each bolt 20 and nut 21 and open each fixing frame 32.

(8) From now on, lift up the fuel assembly 34 and insert it into each of the released fixing frames 32.

(9) Next, each holding member 25 is attached to the fuel assembly 34.
The fixing frame members 30 and 31 are rotated and attached to the bolts 20 while making contact with the respective support grids.
and by connecting with the nut 21,
Each fixing frame 32 is closed.

As a result, the fuel assembly 34 is held in a state where it is pressed from all sides by each auxiliary frame 27 and the fixing frame 32.

(10) Furthermore, by rotating each auxiliary frame 27 in the opposite direction to the above-mentioned direction, the nuclear fuel assembly 34 is housed in the cross frame 10 together with the auxiliary frame 27, so that each of the lower sides of the cross frame 10 is The fuel assemblies 34 are housed in the cross frame 10, and a total of four fuel assemblies 34 are mounted on the cross frame 10.

(11) In this way, remove the support member (not shown) holding the cross frame 10 from the cross frame 10 to which the four fuel assemblies 34 are attached, and gently fold down the cross frame 10 to mount it. Place it on the frame 8.

(12) Next, connect the upper end of each support column 14 attached to the mount frame 8 with the connecting fitting 13a.
each mounting bracket 1 of the cross frame 10 via
Fixed at 5.

As a result, the four fuel assemblies 34 are installed in the lower container 3 via the cross frame 10 and the mount frame 8.

(13) From now on, the upper cover 4 is placed on the upper part of the lower container 3 and the two are connected with the bolts 2a, thereby completing the storage of the fuel assembly 34 into the transportation container 1.

In this way, the transport containers 1 containing the fuel assemblies 34 are loaded onto a truck as a pair.

Therefore, one truck can transport eight bodies.

As explained above, the present invention has a mount frame attached to a lower container to which an upper lid is removably attached via a mount made of a shock absorbing member, and a cross frame and an auxiliary support attached to the mount frame via a support column. The frame is fixed, radiation-resistant members are attached to the cross frame and the auxiliary frame, and a plurality of fixing frames are rotatably attached to the cross frame and the auxiliary frame, and the fuel assembly is attached to the fixing frame. In the fuel assembly transport container, in which a pressing member for holding the fuel assembly between the radiation-resistant member and the radiation-resistant member is movably attached by pressing the cross frame, a cross frame is mounted on the mounting frame, and a horizontal frame thereof is mounted on the mounting frame. An L-shaped auxiliary frame is attached removably in parallel with the frame, and an L-shaped auxiliary frame is attached to both sides of the base on the mount frame side of the vertical frame of this cross frame so as to be rotatable at its bent part, and the base on the opposite side of the vertical frame is attached to the cross frame. and both ends of the horizontal frame and between the ends of each of the auxiliary frames, the fixing frame is rotatably attached to the horizontal frame, the vertical frame, and the fixing frame. It is characterized by forming a space for holding the fuel assembly at a position surrounded by the auxiliary frame and a position surrounded by each auxiliary frame and a fixing frame,
By storing four fuel assemblies in one transport container and loading this transport container onto two trucks, it becomes possible to transport eight fuel assemblies with one truck.

In addition, by suppressing the increase in the external size of the transport container, it is possible to increase the amount of fuel assemblies transported within the scope of the regulations of the Road Traffic Act without causing a rise in transport costs. The buffer member can suppress external force applied to the transportation container from acting on the fuel assembly, and can improve safety during transportation.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional side view of a transportation container showing an embodiment of the present invention, FIG. 2 is a vertical cross-sectional front view, and FIG. 3 is a state in which the auxiliary frame attached to the cross frame is rotated. FIG. 1...Transportation container, 3...Lower container, 4...Top lid, 8...Mount frame, 9...Mount,
10...Cross frame, 11...Horizontal frame,
12... Vertical frame, 12a... (one) end, 22, 32... Fixing frame, 25... Holding member, 27... Auxiliary frame, 33... Shrinkage member, 34... Fuel assembly body.

Claims (1)

[Claims] 1. A mount frame is attached to the lower container to which the upper lid is removably attached via a mount made of a shock absorbing member, a cross frame and an auxiliary frame are fixed to this mount frame via support columns, and this cross frame and A radiation-resistant member is attached to the auxiliary frame, and a plurality of fixing frames are rotatably attached to the cross frame and the auxiliary frame, and to the fixing frames,
In a fuel assembly transport container in which a pressing member is movably attached to press a fuel assembly and hold the fuel assembly between the radiation shielding member and the mounting frame, a cross frame is attached to the side of the mounting frame. The frame is removably attached parallel to the mount frame, and on both sides of the base of the vertical frame of this cross frame on the mount frame side.
An L-shaped auxiliary frame is rotatably attached at its bent portion, and the fixing member is provided between the opposite base of the vertical frame and both ends of the horizontal frame, and between the ends of each of the auxiliary frames. The frame is rotatably attached, and each of the positions surrounded by the horizontal frame, the vertical frame, and the fixing frame, and the positions surrounded by each auxiliary frame and the fixing frame, A fuel assembly transport container characterized by forming a space for holding fuel assemblies.