JPH0249597Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a storage basket for radioactive waste.

Most of the non-combustible radioactive solid waste generated from nuclear facilities is currently temporarily stored untreated in storage or underwater in pits.
These wastes continue to accumulate, and the storage capacity of storage bins or pits is becoming a problem.
Therefore, in order to improve this storage efficiency, waste volume reduction treatment is being implemented. Volume reduction methods include disassembly, compression, fragmentation, and melting. Disassembly methods include separating the waste by cutting or removing fasteners, and tightly bundling the separated parts or tightly placing them in storage containers. It is designed to reduce the volume by storing it.

Fuel inserts, such as burnable poison aggregates used in pressurized water reactors, have traditionally been stored in pits as they are after use, which significantly reduces pit storage efficiency. Ta. The above poison aggregate has a diameter of approximately 10 mm and a length of 4
10 to 20 rods of 1.5 m in diameter are attached to the holder at a pitch of about 40 mm, so if this is disassembled and stored in a basket, the volume can be reduced to about 1/10.

In order to densely store each poison rod after disassembling and separating the above-mentioned aggregate into a basket, the basket generally adopts a structure in which the basket is divided into small compartments for each poison rod. If a poison rod is supplied to each section, if the poison rod is bent, it will not enter the section completely and will protrude significantly upward. It is necessary to completely push these poison rods into each compartment, but there are usually over 100 compartments in one basket, and it is extremely difficult to align each one underwater and push the poison rods into each compartment. It is complicated.

This invention was made to eliminate these conventional drawbacks, and the basket lifting frame attached to the upper part of the basket body is configured to be retractable, so that the entire poison rod can be moved to each compartment in one operation. It is designed so that it can be pushed into the That is, this invention consists of a basket main body whose interior is divided into small compartments to store elongated waste in close proximity to each other, and a frame attached to the upper part of the basket main body. It consists of a pair of upper plates located on the upper side of the basket body and arms connected to both sides of each upper plate and positioned on the sides of the basket body, and a pair of shafts are respectively provided on opposite sides of the basket body. The arms are rotatably mounted around this axis, gears are mounted on each of the arms on at least one side, and the gears mesh with each other so that the arms rotate simultaneously in opposite directions. The upper plate of the frame is positioned on the side of the basket body by rotation of the arm.

Embodiments of this invention will be described below with reference to the drawings. In FIGS. 1 to 3, a basket 1 consists of a basket body 2 and a frame 3, and a large number of partition plates 21 are formed inside the body 2 in a grid pattern.
An elongated waste material, for example a poison rod 4, is inserted into each compartment partitioned by a partition plate 21. The frame body 3 consists of a pair of upper plates 33 and 34, arms 32 attached to both sides of the upper plate 33, and arms 31 attached to both sides of the upper plate 34, and the arms 31 and 32 are attached to the sides of the basket body 2, respectively. It is rotatably attached around a shaft 6 provided in the section. The ends of the upper plates 33 and 34 are abutted against each other to form a substantially square opening 35 between them, through which a pair of claws 71 are inserted as shown by the wiring in FIG. 3
3 and 34, the basket 1
The equipment is lifted up and transported to a designated storage location.

A quarter-circle gear 7 is attached coaxially to the arms 31 and 32, and the teeth 70 of the gears 70 mesh with each other so that the arms 31 and 32 simultaneously rotate in opposite directions. Also arm 31,
A shaft 50 is attached to 32, and a spring 5 is stretched between them to apply a tensile force. The shafts 6 on both sides are held by arms 25 provided on the main body 2. For clarity, in FIG. 3, the spring 5 is shown on the front side, and the arm 25 is shown cut away. Further, an actuating rod 80 is attached to the arm 32 on one side so as to protrude laterally.

In the above configuration, in order to insert the poison rod 4 into the basket body 2, as shown in FIG.
The frame body 3 is rotated laterally, and a poison rod 4 is fed into each compartment from above by a feeding means (not shown). Since each section is slightly larger than the outer diameter of the poison rod 4, if the poison rod 4 is bent, it will hit the partition plate 21 and will not reach the lower end due to the frictional force, and the upper end will be connected to the main body 2. It will protrude upwards. So basket 1
By lifting and pressing against the ceiling board 8, the protruding poison rod 4 is pushed into each compartment.

To bring the frame 3 into the state shown by the solid line in Figure 4, move the basket 1 from the state shown by the imaginary line in Figure 4 (the state shown in Figures 1 to 3) to the right with respect to the fixedly installed actuating member 82. . As a result, the actuating rod 80 is pushed by the slope of the actuating member 82, and the left frame 3
rotates counterclockwise against the force of spring 5. As a result, the right frame 3 connected via the gear 7 also rotates clockwise, resulting in the state shown by the solid line in FIG. 4. Further rotation is prevented by a suitable stopper. In this state, spring 5
The upper plates 33, 34 of the frame are urged further downward by the tensile force, and this state is maintained.

Further, in order to change the state shown in FIG. 4 to the state shown in FIGS. 1 to 3, the basket 1 is lowered relative to an operating member 81 fixedly provided at an appropriate position. As a result, the actuating rod 80 is pushed up by the slope of the actuating member 81, the left frame 3 rotates clockwise, and the right frame 3 connected via the gear 7 rotates counterclockwise. 1 to 3, and this state is maintained by the tensile force of the spring 5.

Incidentally, instead of the fixedly provided actuating member, a driving means such as a cylinder may be used to rotate the frame while keeping the basket fixed.

This cylinder etc. and the above-mentioned operating members 81, 82
may be attached to a basket support frame (not shown).

As explained above, this invention makes it possible to efficiently store elongated radioactive waste in a basket, and also allows each waste to be reliably stored in the basket with simple operations.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a basket showing an embodiment of this invention, Fig. 2 is a right side view thereof, Fig. 3 is a left side view of Fig. 2, and Fig. 4 is a side view with the frame retracted. It is a diagram. 1...basket, 2...basket body, 3
...Frame, 4...Poison rod, 5...Spring, 7...Gear, 31, 32...Arm.

Claims (1)

[Scope of utility model registration request] a basket body whose interior is divided into small compartments for storing elongated waste in close proximity to each other;
It consists of a frame attached to the top of the basket body, and this frame includes a pair of upper plates located on the upper side of the basket body, and arms connected to both sides of each upper plate and located on the sides of the basket body. A pair of shafts are provided on opposite sides of the basket body, and the arms are rotatably mounted around the shafts. Gears are mounted on each of the arms on at least one side. The basket is characterized in that the gears mesh with each other so that both arms rotate simultaneously in opposite directions, and the upper plate of the frame is positioned on the side of the basket body as the arms rotate. A storage basket for radioactive waste.