JPS6158795B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for moving heavy objects such as fuel storage baskets, and more specifically, for example, in a spent fuel storage facility, the present invention relates to a device for moving heavy objects such as fuel storage baskets. It relates to equipment for moving heavy objects with high radioactivity, such as spent fuel, fuel storage baskets, and containers containing high-level radioactive waste, between

Spent fuel at spent fuel storage facilities is usually handled underwater, as its radioactivity is extremely high, using water as a shield. As shown in FIG. 1, a fuel storage pool 1 and a fuel handling pool 2 are provided, in which a fuel storage basket containing spent fuel is removed from a transport container (cask) or stored in a transport container. These are connected by a transfer waterway 3. A partition wall 4 is installed between the fuel storage area including the storage pool 1 and the waterway 3 and the fuel handling area including the handling pool 2 from the viewpoint of nuclear material protection, ventilation air conditioning, earthquake resistance, etc. Therefore,
In such facilities, a device is required to move the fuel storage baskets from one side of the handling pool 2 and the waterway 3 to the other under the bulkhead 4. As such a moving device, as shown in FIG.
An opening 5 is provided in the underwater part of the handling pool 2.
At the bottom of these rails 6 are provided which extend from the opening 5 to the water channel 3, and on this rail 6 a moving trolley 7 is mounted.
is placed on the trolley 7 by a crane (not shown).
It is known that a fuel storage basket A placed on a fuel storage basket A is moved from one of a handling pool 2 and a waterway 3 to the other by means of a cart 7. However, in such a device, main movable parts such as the trolley 7 are located underwater at the bottom of the handling pool 2 and waterway 3, making maintenance, inspection, repair, etc. difficult. The above work may not be possible because the radioactivity is particularly high compared to the above.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a device for moving heavy objects such as fuel storage baskets that is easy to maintain, inspect, and repair.

This invention will be explained in detail below with reference to an embodiment shown in FIG.

FIG. 3 shows a part of the spent fuel storage facility, in which a partition wall 12 is provided between the fuel handling pool 10 and the transfer waterway 11, extending from the water bottom to the ceiling of the building. A rectangular opening 13 is provided in the underwater portion of the partition wall 12.
A substantially vertical rotating shaft 14 is supported on one side of the partition wall 12 above the central portion of the opening 13 via a bearing 15 fixed to one side of the partition wall 12 . The upper part of the rotating shaft 14 protrudes above the water surface L and is connected to a drive device 16 fixed to a portion of the partition wall 12 above the water surface L by appropriate means. A holding portion 17 of the fuel storage basket A corresponding to the opening 13 is fixed to the lower part of the rotating shaft 14 . This holding part 17 protrudes laterally from the rotating shaft 14, and when the rotating shaft 14 rotates, the opening 13 is opened from one of the handling pool 10 and the water channel 11.
through which it moves to the other side.

In the above, from the handling pool 10 to the waterway 11
When moving basket A to
After placing the basket A on the side of the handling pool 10 and inserting the basket A into the holding part 17 using a crane (not shown) or the like, the rotating shaft 14 is rotated 180 degrees. As a result, the basket A moves from the handling pool 10 to the water channel 11 side. On the waterway 11 side, the basket A is taken out by a crane (not shown), and then the rotary shaft 14 is rotated 180 degrees to handle the empty holding part 17 again and move it to the pool 10 side.
When moving the basket A from the waterway 11 to the handling pool 10, the above operation may be performed in reverse. In some cases, the basket A may be left inserted in the holding part 17, fuel may be inserted into the basket A in one of the handling pool 10 and the waterway 11, and the rotating shaft 14 may be rotated 180 degrees. After moving this to the other side, it is also possible to take out only the fuel.

The drive device 16 rotates the rotating shaft 14 in a certain direction by 180 degrees.
It may be rotated by 180 degrees or reversed by 180 degrees. Furthermore, the holding portions 17 of the basket A may be provided at two symmetrical locations on both sides of the rotating shaft 14.

This invention can be applied not only to spent fuel storage facilities but also to other nuclear facilities such as reprocessing plants, and in addition to moving fuel storage baskets, it can also be used to move single fuel or to transport high-level radioactive waste. It can also be applied to moving containers, etc.

The moving device according to the present invention includes a pool 10 for handling heavy objects such as fuel storage baskets and a transfer waterway 11.
An opening 1 is provided in the underwater part of the partition wall 12 installed between the
3 is provided, and a substantially vertical rotating shaft 14 whose upper part projects above the water surface and is connected to a drive device 16 is supported on the partition wall 12 above the center of the opening 13.
The rotating shaft 14 is provided with the above-mentioned heavy object holding portion 17 that corresponds to the opening 13 and protrudes laterally, and since all the main movable parts are above the water surface, maintenance, inspection, and repair are possible. These tasks are extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing a spent fuel storage facility, FIG. 2 is a schematic side view showing a conventional example, and FIG. 3 is a schematic side view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Fuel handling pool, 11... Transfer channel, 12... Partition wall, 13... Opening, 14... Rotating shaft, 16... Drive device, 17... Holding part.

Claims (1)

[Claims] 1 A bulkhead 1 installed between a pool 10 for handling heavy objects such as fuel storage baskets and a transfer waterway 11
An opening 13 is provided in the underwater part of 2, and this opening 1
A substantially vertical rotating shaft 14 whose upper part projects above the water surface and is connected to a drive device 16 is supported on the partition wall 12 above the center of the opening 1.
A device for moving a heavy object such as a fuel storage basket, which is provided with the above-mentioned heavy object holding portion 17 which corresponds to No. 3 and projects laterally.