JPH0511919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transportation container for a fuel assembly for a nuclear reactor.

[Prior Art] Conventionally, this type of transportation container has a mount frame suspended within the container body via a plurality of buffer members.
The fuel assembly is configured to be fixed to a column attached to this mount frame.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional transportation container for fuel assemblies, a large mount frame on which supports for holding the fuel assemblies are placed is used, and this mount frame is connected to a plurality of shock absorbers. Since it is suspended through members, there is a disadvantage that the suspended part becomes large and the entire transport container also becomes large. For this reason,
There was a problem in that the number of fuel assemblies that could be loaded per truck was limited, which hindered economical transportation.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems. a fixing member for fixing the fuel assembly; an annular body fitted at multiple locations in the longitudinal direction of the support to which the fuel assembly is fixed; disposed in a gap between the outer periphery of the annular body and the inner surface of the container body; It is characterized by comprising a cushion material that expands and deforms to fill the gap between the cushions.

[Function] In the present invention, in order to insert a fuel assembly into a container and transport it, the fuel assembly is first fixed to the support with a fixing member, and annular bodies are fitted at several locations in the longitudinal direction of the support. . Next, the cushion material before expansion and deformation is placed in the gap between the outer periphery of the annular body and the inner surface of the container body, and the strut is inserted into the container body to a predetermined position. Then, the cushion material is expanded and deformed to fill the gap with the cushion material.

As described above, it is possible to absorb the impact force by the cushion material and prevent the impact force from being transmitted to the fuel assembly, regardless of the impact from any direction in the circumferential direction of the container body.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1, reference numeral 1 indicates a container body.
This container body 1 is formed into a cylindrical shape, and the entire inner surface is lined with a heat-resistant material 1e.
Furthermore, flanges 1a are formed on both opening end faces. Further, a reinforcing plate 1b is wound around the outer circumferential surface at a position where a tube 9, which will be described later, comes into pressure contact with the reinforcing plate 1b, and a stand 1c for horizontally holding the container body is provided on the reinforcing plate 1b arranged near the left and right ends. ing. Further, the reinforcing plate 1b is provided with a support 1d for stacking the container bodies 1. A fuel assembly F covered by a cardboard and held by a support 2 is fixed to the container body 1.

As shown in FIG. 2, the column 2 has a vertical portion 2a.
and a horizontal portion 2b, the cross section of which is formed into an inverted T-shape. The support column 2 is designed to hold the fuel assembly F straight by placing the fuel assembly F on both sides of the vertical part 2a, that is, on the upper part of the horizontal part 2b. An annular body 3 is disposed in the longitudinal direction of the strut 2 at the position where the support grid of the fuel assembly F is located.
and fixing members 4 are arranged alternately. In this case, the annular bodies 3 are arranged alternately with the fixing members 4 in positions of the support grid near both ends of the fuel assembly F.

The annular body 3 has a U-shaped cross section with an inwardly recessed circumferential surface. As shown in FIG. 3, this annular body 3 is divided into four arcuate bodies, which are divided into left and right halves at the center of the U-shaped circumferential recess and vertically halves. A U-shaped member 5 and an arm 6 are integrally formed on the inner peripheral surface of the left-side divided arcuate body, that is, the upper left arcuate body 3a and the lower left arcuate body 3b. Further, the U-shaped member 5 is formed with a flange 5a for fixing the annular body 3 to the column 2, and the arm 6 has a hole 6 for passing a bolt connecting the left and right arc-shaped bodies.
a is formed. Further, a flat plate 7 is integrally formed on the inner peripheral surface of the circular arc-shaped body divided on the right side, that is, the upper right circular-shaped body 3c and the lower right circular-shaped body 3d, and the flat plate 7 has a hole 6a of the arm 6. A hole 7a is formed at the same position. The left and right arcuate bodies are integrally connected by bolts passed through holes 6a and 7a of the arm 6 and flat plate 7, respectively. Further, the upper and lower arc-shaped bodies are provided so that the respective U-shaped members 5 sandwich the fuel assembly F from above, and the side edges of the horizontal portion 2b of the support column 2 from below, and the respective flanges 5
A is connected and fixed to a flange 2c on the side edge of the horizontal portion 2b of the support column 2 shown in FIG. 2 with bolts. As described above, the annular body 3 is arranged around the support column 2 and the fuel assembly F. Further, the U-shaped member 5 of the annular body 3 is provided with a pressing mechanism 8 for pressing and fixing the fuel assembly F to the support column 2 as shown in FIG. The pressing mechanism 8 includes a threaded rod 8a, a pusher 8b rotatably provided at the tip thereof, and a threaded rod 8a.
a and a lock nut 8c for fixing it to the U-shaped member 5.

The fixing member 4 includes an L-shaped fixing frame 4a and a pressing mechanism 8. The fixed frame 4a is the first
As shown in the figure, one end is rotatably attached to each of the left and right edges of the horizontal part 2b of the support column 2, and the other end is connected by bolts on the side of the vertical part 2a, surrounding the fuel assembly F. It is set up like this. This fixing frame 4a is equipped with a pressing mechanism 8 similar to the one attached to the U-shaped member 5, as shown in FIG. ing.

A tube 9 (cushion material) is fitted onto the outer periphery of the annular body 3, as shown in FIGS. 1 and 3. The tube 9 is a flexible cylindrical member made of rubber or the like and formed into an annular shape. This tube 9 can be easily fitted by dividing the annular body 3 into left and right parts from the center of the circumferential surface.
Furthermore, pads 10 formed in the shape of hollow discs and made of a flexible material such as rubber are provided on both end faces in the longitudinal direction of the support column 2. These tubes 9 and pads 10 are connected by piping, hoses (none of which are shown), etc., and air is supplied through a nozzle 10a provided on the end surface of the pads 10, causing them to expand and deform. .

Further, fixed shafts 2d are provided on both the left and right ends of the column 2 in the longitudinal direction, and a wheel 2e is rotatably provided on each of these fixed shafts 2d.

In FIG. 1, reference numerals 11 and 12 are a right lid and a left lid that close both open ends of the container body 1. As shown in FIG. Flanges 11a and 12a having shapes that match the flange 1a of the container body 1 are formed on the respective peripheral edges of the right and left lids 11 and 12, respectively. In addition, the left lid 12 accommodates the support 2 inside the container body 1, so that when both open ends of the container body 1 are closed, the nozzle 10a of the pad 10 communicates with the outside.
A hole 12b is formed.

In addition, S represents the fuel assembly F, the strut 2, and the pusher 8.
This is a bottom plate made of a material such as synthetic resin that is inserted between the fuel assembly F and the fuel assembly F to protect the surface of the fuel assembly F.

In order to store the fuel assembly F in the transport container configured as described above, as shown in FIG. First, two fuel assemblies F are temporarily held on the support column 2 with the fixing member 4. Once pressed, it is laid down horizontally and the fuel assembly F is fixed to the support column 2 using the U-shaped portion 5 of the annular body 3. Next, the tube 9 is fitted onto the circumferential surface of the annular body 3. At this time, the annular body 3
Since it is divided into left and right halves at the center of the recess on the circumferential surface, the tube 9 can be easily fitted. Then, the pads 10 are attached to both end surfaces in the longitudinal direction of the column 2, and each pad 10 and tube 9 are attached to each other.
Connect piping, etc. to Next, the support column 2 is inserted into the container body 1 which is placed approximately horizontally. When inserting, there is no air in the tube 9, so it can be inserted smoothly. In addition, the support 2 has wheels 2e
It runs smoothly inside the container body 1 and is installed at a predetermined position. Once installed, wheel 2 at 4 locations
Remove e. Next, the open end of the container body 1 is closed with the right lid 11 and the left lid 12. At this time, the nozzle 10a of the pad 10 protrudes from the hole 12a of the left cover 12. Air is supplied from this nozzle 10a to expand and deform the tube 9 and pad 10. As a result, the support column 2 is attached to the container body 1.
It is held inside by the tube 9 and pad 10. Therefore, even if an impact is applied from any direction on the container body 1, the impact force is absorbed by the tube 9.
The shock force can be absorbed by the pad 10 to prevent the impact force from being transmitted to the fuel assembly F.

In the transport container configured as above,
The annular body 3, the tube 9, and the pad 10 provided on the end face of the strut 2 can hold the fuel assembly F so that no impact is transmitted, so the fuel assembly F can be held as in the conventional method. Compared to the case where a large mount frame on which a support column is placed is suspended via a plurality of impact members, the impact absorbing portion becomes extremely small and lightweight. Also,
Accordingly, the container main body 1 is also made smaller and lighter, and therefore the manufacturing cost of the transportation container can be reduced. Furthermore, since the transport container is made smaller and lighter, the number of fuel assemblies F loaded on each truck can be increased, and the cost of transporting the fuel assemblies F can be reduced. Furthermore, since the impact force can be sufficiently absorbed from any direction of the container body 1, the fuel assembly F
can be transported safely. Furthermore, since the support column 2 is provided with wheels 2e, the support column 2 can be easily inserted into the container body 1. Also,
Since the annular body 3 can be divided into left and right parts at the center of its circumferential surface, the tube 9 can be easily fitted onto the circumferential surface of the annular body 3.

In the above embodiment, the cushion material is constituted by the tube 9 that expands and deforms with air.
The structure may be such that the gap between the container body 1 and the container body 1 is filled with a material such as foamed resin.

[Effects of the Invention] As explained above, according to the present invention, the cushion material disposed in the gap between the annular body and the container body can hold the fuel assembly F so that no impact is transmitted. Therefore, compared to the conventional case where a large mount frame is used on which supports for holding fuel assemblies are placed, and this mount frame is suspended via multiple shock absorbing members, the part that absorbs shock is reduced. Extremely small and lightweight. Additionally, the container main body is also made smaller and lighter, thereby reducing the manufacturing cost of the transportation container. Furthermore, since the entire transport container is made smaller and lighter, the number of fuel assemblies F loaded per truck can be increased, and the cost of transporting the fuel assemblies F can be reduced.

Further, since the impact force can be sufficiently absorbed from any direction in the circumferential direction of the container body, the fuel assembly F can be transported safely.

[Brief explanation of the drawing]

1 to 3 are views showing one embodiment of the present invention, in which FIG. 1 is a perspective view of a transportation container for a fuel assembly, and FIG. 2 is a partially cutaway perspective view of an attachment portion of an annular body. , FIG. 3 is an exploded perspective view of the annular body, and FIG. 4 is a diagram showing a method of attaching the fuel assembly to the strut. 1... Container body, 2... Support, 3... Annular body,
4...Fixing member, 9...Tube (cushion material), F...Fuel assembly.

Claims (1)

[Claims] 1 A cylindrical container body, a strut inserted into the container body, a fixing member that fixes the fuel assembly to the strut, and an annular member fitted at multiple locations in the longitudinal direction of the strut to which the fuel assembly is fixed. body, disposed in a gap between the outer periphery of the annular body and the inner surface of the container body,
A transportation container for a fuel assembly, comprising a cushion material that fills the gap by expanding and deforming the material.