JPS60397A - Lifting rest for high radioactive solid waste volume decreasing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to spent fuel channel boxes (hereinafter referred to as PCBs), which are highly radioactive solid waste generated from boiling water nuclear reactors.
) and spent control rods (CB,),
In particular, the present invention relates to a cutting device that can remotely perform cutting operations underwater and that can cut FCB and CRk using the same device.

[Background of the invention]

Highly radioactive solid wastes such as F''CB and CR generated from nuclear reactors are currently stored in their original form in spent fuel storage pools or highly radioactive solid waste storage pools at nuclear power plants.

However, the PCB is a long box with a rectangular cross section, and
Since R is a long, cross-shaped product, there is a problem in that the storage density during storage is low, and therefore the storage space becomes extremely large.

[Purpose of the invention]

The purpose of the invention is to provide a device for cutting and reducing the volume of FCH and CR into an optimal shape in order to improve the storage efficiency of PCB and CR and secure storage space.

[Summary of the invention]

The present invention cuts % PCS and CR by specifying a cutting torch and pivoting the object to be cut, and also cuts the falling speed limiter part of CR with the torch. Therefore, the CR and PCB are fixed and pivoted.

[Embodiments of the invention]

An embodiment of the present invention will be described below.

The four structures of the cutting device are shown in Figures 1 and 2, and the overall system diagram is shown in Figure 3.The A-4 cross section of Figure 1 is shown in Figure 4.
Detailed views of the lower cart are shown in FIGS. 5 and 6, and the loaf shapes of II''CB and CR are shown in FIGS. 7 and 8.

The cutting device includes a base l installed above the floor and protruding above the pool, a frame 2 installed underwater from the base l along the pool wall surface, an upper cart 3 that moves up and down using the frame 2 as a guide, A lower cart 4, a drive motor 12 that drives the upper and lower carts 3 and 4 via a ball screw 5, a box 8 for collecting gas generated during cutting by a pair of cutting torches 6a and 6b, and a box 8 for collecting gas that is generated during cutting by a pair of cutting torches 6a and 6b, ), a pump lO and a filter 11 for collecting floating matter generated during cutting, a partition wall 7 for isolating these gases, dross, floating matter, etc. so that they do not spread into the grape pool.

Cutting of FCB21 and CR22 is shown in FIGS. 7 and 8, respectively.

P CI'321 or (IL2
This is done by fixing the cutting torches 2 and raising the cutting torches 3 and 4 one lift above and below the fixed cutting torches 6a and 6b. Further, the falling speed limiter section 52 of C1 (22) is cut by inserting an X-Y table suspended from the CR22 from the top of the upper cart 3.

PCB21id: As shown in FIG. 7, rectangle i,
A long box with an IT surface is cut vertically using full-cutting torches 5a and 5b at two of the four corners to form a long box 50 in a dogleg shape.

(j (22) is shown in FIG. 8, after first cutting the falling speed limiter part 52, cut the tie rod that runs along the axis of the remaining long length of the cross-shaped cross section. The cut shape is the same as that of F' CB 21.

The gas generated during this cutting is collected in the gas recovery box 8 at the top of the device.
The dross is collected and falls into the dross receiver 119 at the bottom of the device. Further, the suspended solids are sucked into the pump IO together with the water in the partition wall and filtered through the filter 11).

Here, the lifting platform for the unexploded man will be explained with reference to FIGS. 4, 5, and 6.

The elevating frame is made up of #4 by the upper car 1-3, the FCB/C box common support table 15, and the lower cart 4.

The upper cart 3 and the lower cart 4 are connected to each other and move up and down as a unit.

A removable FOB/CR shared support table 15 is mounted on the upper cart 3.

The Li''CB/CR common support table 15 is provided with an opening, as shown in FIG.
The CB 21 and C'R22 can be suspended from the upper part of the Ii'CB/CR common support table 15. Also, due to this shape, two cutting torches 6a and 6b are provided.
l Can be used at the same time to cut tie rod parts of %CR22. A plurality of guides 30 are provided above and below the p″CB/CFL common support table 15, and the valley FCI 321
and CFL22't guide. Further, the lower guide 301-1 of the upper cart 3 has a length that can accommodate the difference in length between the target objects to be cut, FCB 21 and CR22.

The lower cart 4 includes a clamping mechanism 14 for the FCB 21 and the C1122, a cutting detection mechanism, and a transport mechanism 19a for cutting the falling speed limiter 52 of the CR22.

19b and 19c are attached.

The clamp mechanism 14 of FCB21 and CI'L22 is
It is attached to the common part when FCB21 or CB22e is set so that CB21 or (R22 can be clamped with one unit. Shirt for driving the clamp mechanism 14)
31 is placed above the upper cart 3, and is removed by rotating it with a long tool from the top of the device.
to drive. That is, the rotation of the pivot shaft 31 rotates the clamp shaft 32 via the worm gear, and the clamp mechanism 14 is opened and closed by the feed screw mechanism.

Further, the lower cart 4 is provided with a step for detecting cutting. As a result, when cutting is completed, the unclamped cut pieces fall into the step, allowing the operator to confirm that cutting is complete.

The CR 22 (75 falling speed limiter 52) is cut by this device using a horizontal drive device using an X-Y table. At this time, the CR 22 is cut without contacting the lower cart 4.

When the falling speed Ml ivy 52 is cut, the lower cart 4 and the falling speed limiter storage section 18 of the main body of the apparatus are arranged to be at approximately the same height. The cut falling speed limiter 52 falls onto the lower cart 4. The lower cart 4 is provided with falling speed limiter transfer mechanisms 19a, 19b, and Igc to transfer the falling speed limiter 52 to the storage section 18. The lower cart 4 is inclined from the frame 2 side to the fall speed limiter storage section 18 side.
C box 22 after disconnecting FCB 21 and falling speed limiter 52
It is designed so that it will not interfere when inserted. Due to this inclination, the fallen falling speed limiter 52 is transferred to the falling speed limiter storage section 18.

Further, the lower cart 4 has an opening in the center so that the dross generated in the process falls into the dross collection box 9 at the bottom of the device.

According to this embodiment, it is possible to fix the PCB and CR so that Ii'CB and CR can be cut with the same cutting torch, and
After cutting the speed transmitter section, it can be transferred to the storage section of the device ff, and the falling dross generated during cutting can be stored in the dross collection unit U.

〔Effect of the invention〕

According to the present invention, it is possible to position, fix, and cut a PCB and a CR with the same device.

[Brief explanation of drawings]

Fig. 1 is a front view of a highly radioactive solid waste cutting device according to an embodiment of the present invention, Fig. 2 is a front view of Fig. 1, and Fig. 3 is a system diagram of the gas, dross, and suspended matter collection mechanism. , FIG. 4 is a sectional view taken along line A-A in FIG. 1, and a plan view of the lower cart in FIG. 5.
6 is a side view of FIG. 5, FIG. 7 is a diagram showing the cut shape of the PCB, and FIG. 8 is a diagram showing the cut shape of the CR. 1...Base, 2...Frame, 3...Upper car), 4...Lower cart, 5...Ball screw, 6a,
6b... Cutting torch, 7... Bulkhead, 8... Gas recovery box, 9... Dross recovery box, 10... Pump, 11
...filter, 12...IJJ3b motor, 13.
... Door, 14... Clamp mechanism. Agent Patent Attorney Akio Takahashi No. 1 Tea No. 2 No. 3 No. 3 No. 4 No. 5/4 No. 6 No. 7

Claims (1)

[Claims] 1. In a device for cutting PCBs (spent fuel channel boxes) or CRs (spent control rods) generated from boiling water reactors, there are multiple mounts installed vertically, and A highly radioactive solid waste volume reduction device characterized by having a guide mechanism for the attached PCB and CR, and a mechanism for grasping the FCl2 and CR attached to the pedestal, so that they can be moved up and down in unison. Lifting platform.