JPH037917B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention provides a locking device for transporting storage containers for cut blocks, stockers for burning bars used in cutting machines, etc. into and out of the reactor when cutting and disassembling a nuclear reactor. Regarding.

(Technical Background) To dismantle a nuclear reactor, it is necessary to completely isolate human bodies from the atmosphere from radioactive contamination.

Therefore, while the reactor is sealed in its enclosure, a cutting device is operated by remote control to cut the concrete inner wall of the reactor. When carrying the burning bar stocker and other equipment used for this cutting into and out of the reactor, it is necessary to ensure that the enclosure is completely sealed.

The same applies to the case where cut blocks produced by cutting are stored in a container, sealed, and transported.

Moreover, before transporting the reactor from inside the reactor, it is necessary to clean the stockers, equipment, and containers themselves to completely eliminate radioactive contamination.

(Purpose of the invention) Therefore, when transporting the stockers and containers from inside the reactor to outside the reactor, a locking device is provided to prevent radioactivity inside the reactor from leaking outside, and various articles to be transported inside this locking device are provided. The purpose is to provide a loading/unloading lock device that cleans and decontaminates radioactivity, and to completely prevent radioactive contamination during nuclear reactor dismantling work.

(Summary of the invention and embodiments) Hereinafter, the loading/unloading lock device of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing the state in which the loading/unloading lock device according to the present invention is used in a disassembly equipment for a nuclear reactor 1.

To outline the dismantling apparatus for the nuclear reactor 1, an enclosure 10 is built into the reactor 1, a gantry 20 and an elevator 30 are provided on the upper side 11 of the enclosure 10, and a main shaft 40 is suspended within the reactor 1 via these.

A cutting device 50 for cutting the inner wall of the nuclear reactor 1 is provided at the lower end of the main shaft 40 . Since the enclosure 10 completely seals the reactor 1 and blocks radioactivity within the reactor 1, the gantry 20 is connected to the elevator 30 and the main shaft 4.
The attachment part with 0 is also always sealed by a shielding gate or the like.

The gantry 20, the elevator 30, and the main shaft 40 are a support drive part of the cutting device 50, and as the elevator 30 traverses, ascends and descends, and rotates, the cutting device 50 is moved horizontally and vertically via the main shaft 40. It has a movable structure.
Further, the cutting device 50 itself can rotate in the horizontal direction using the main shaft 40 as a reaction force, and the multi-jointed operating arm allows telescopic movement. The cutting device 50 is equipped with a cutting machine that injects and burns fuel using a burning bar to perforate the inner wall of the nuclear reactor, and the inner wall of the nuclear reactor is cut into block-shaped cutting blocks by continuously making the perforations.

A gripping device 60 is also provided for carrying in and out the cut cutting block and the stocker for the burning bar of the cutting machine. The gripping arm of this gripping device 60 grips and carries out the cutting block,
Furthermore, when the burning bar is consumed, the empty stocker is removed from the cutting machine and carried out, and a new stocker filled with burning bar is carried in and installed.

When carrying these cutting blocks and burning bar stockers from inside the reactor to the outside of the reactor, and when carrying them into the reactor from outside the reactor, a carry-in/out lock device is installed to maintain the hermetic state of the enclosure 10. Do it in that state.

FIG. 2 is a partially omitted diagram illustrating the installation state of the loading/unloading lock device 70. Loading/unloading lock device 7
0, a primary opening/closing door 702 that opens and closes a primary opening 712 provided on one side of a box-shaped main body 701 with the enclosure 10 as a boundary wall is placed inside the reactor, the so-called cavity side, and a primary opening/closing door 702 is provided on the opposite side. A secondary opening/closing door 703 for opening/closing a secondary opening 713 is arranged on the enclosure 10 side.

The inside and outside of the reactor 1 are sealed off by the enclosure 10 to maintain a sealed state, but the loading/unloading lock device 70 serves as the only loading/unloading entrance.

FIG. 3 is a schematic vertical cross-sectional view for explaining in more detail the structure of the loading/unloading lock device 70 of the present invention.

The loading/unloading lock device 70 has a primary opening/closing door 702 on one side of a box-shaped main body 701 and a secondary opening/closing door 703 on the other side facing the box-shaped main body 701. This primary,
The secondary opening/closing doors 702 and 703 are both box-shaped bodies 70
1 and is constructed to maintain a sealed state, and opening/closing operations are automatically performed by remote control.

Inside the box-shaped main body 701, a traversing device 704 is provided at the inner bottom thereof. Traversing device 704
In this example, a chain 734 spanning sprockets 724, 724 is driven by a drive motor 714 to cause the transfer device 705 to move laterally.

The transfer device 705 includes a table 715, a guide rail 725 that guides the table 715, and a drive motor 75 that rotates a long screw 745 that is screwed into a nut 735 provided on the lower surface of the table 715.
It consists of 5.

On the other hand, a lid opening/closing device 706 for opening and closing the lid of the container is provided on the top of the box-like main body 701. The lid opening/closing device 706 consists of a lift 716 and a catcher 726.
The lid of the container is caught and raised and lowered by a lift 716 to open and close the lid. The lid opening/closing device 706 can also be driven remotely and automatically.

Furthermore, a decontamination device 707 is provided at the top of the box-shaped main body 701. This decontamination device 707 consists of a shower duct 717 and an appropriate number of nozzles 727 branched from the duct.
It is sprayed from...

FIG. 4 is a sectional view taken along the line A--A in FIG. 3, showing the inside of the box-shaped main body 701 of the loading lock device 70 from above.

Next, the driving of the carry-in/out lock device 70 when carrying out the cutting block will be explained in detail with reference to FIGS. 3, 5, and 6.

First, in order to carry out the cutting block 501 cut by the cutting device 50, the cutting block 501 is gripped by the gripping arm of the gripping device 60, and
The gripping device 60 is raised to the front of the primary opening/closing door 702 of the loading/unloading lock device 70.

Next, the lid opening/closing device 706 is driven, the lid 81 of the container 80 placed on the transfer device 705 is caught by the catcher 726, and the lift 7
Raise 16.

In this state, when the drive motor 755 of the transfer device 705 is driven to rotate the long screw 745 in a certain direction, the table 715 approaches the primary door 702 using the guide rail 725 as a guide.

Then, the primary opening/closing door 702 is opened by remote control, and the traversing device 704 is driven. That is, when the drive motor 714 of the traversing device 704 is driven in a certain direction, the chain 734 spanning the sprockets 724, 724 rotates, and the transfer device 705 fixed to this chain 734 moves the primary opening 7.
Telescopic operation is performed by entering the reactor interior 12 through 12. Then, as shown in Figure 5,
The cutting block 501 gripped by the gripping arm 611 of the gripping device 60 is stored in the container 80. A predetermined number of cutting blocks 501 are placed in the container 8.
0, the transfer device 705 is driven in the opposite direction to the above, and the table 715 is transferred to approximately the center of the transfer device 705. Next, by rotating the drive motor 714 of the traversing device 704 in the opposite direction to that described above, the transfer device 705 is returned into the box-like main body 701. Then, the primary opening 7 is opened by the primary opening/closing door 702.
Close 12. In this state, the lid opening/closing device 706 is driven to close the lid 81 of the container that has been caught, and the decontamination device 707 is driven to spray decontamination liquid from the nozzles 727, 727... to decontaminate the container 80. . When the radiation concentration below a predetermined value is detected by the detection device, the drive motor 755 of the transfer device 705 is driven to send the table 715 to the vicinity of the secondary door 703. Then, the secondary opening/closing door 703 is opened, the traversing device 705 is driven, and the transfer device 704 is carried out from the secondary opening 713.

Container 80 carried out from secondary opening 713
are stored at a predetermined location and transported by a suitable transport device such as a crane.

The above explanation is for the case of transporting the cutting block 501, but the process is almost the same when replacing and replenishing the stocker of the burning bar used in the cutting device 50.

Also, falling slag etc. that occur when cutting the inner wall, etc.
It is stored in a container via a bucket from a recovery device provided at the bottom of the furnace, and then transported out in the same manner as described above.

In either case, the present loading/unloading lock device 70 is reliable because the primary opening/closing door 702 and the secondary opening/closing door 703 do not open at the same time, and at least one door is closed while the other door is opened. The hermetic function of the enclosure 10 is maintained. Moreover, the traversing device 704 and the transfer device 705 make telescopic movements with respect to the box-like main body 701 to carry out loading/unloading operations appropriately.

In addition, the primary opening/closing door 702, the secondary opening/closing door 703, the traversing device 704, the transfer device 705, and the lid opening/closing device 7
06, each drive of the decontamination device 707 is automatically performed by remote control.

(Effects of the Invention) As explained above, the loading/unloading lock device of the present invention has a primary opening/closing door on one side of the box-like body and a secondary opening/closing door on the other side opposite to the primary opening/closing door. The traverse device is equipped with a table transfer device, and an opening/closing device to open and close the container lid and a decontamination device to decontaminate the transported items are installed on the upper part of the main body, so the sealing of the enclosure can be maintained. It is possible to carry in and out of the reactor while maintaining sufficient maintenance. Therefore, when dismantling a nuclear reactor, the demolition work can be carried out while completely preventing radioactive contamination.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view outlining the nuclear reactor disassembly equipment, Fig. 2 is a partially omitted view illustrating the loading/unloading lock device arranged in the enclosure provided in the reactor, and Fig. 3 The figure is a schematic vertical cross-sectional view of the loading/unloading lock device, Figure 4 is a cross-sectional view taken along the line A-A in Figure 3, and Figure 5 is a state in which the transfer device is carried into the reactor by the traverse device. FIG. 6 is an explanatory view of the transfer device being carried out of the reactor by the traverse device. 1... Nuclear reactor, 10... Enclosure, 7
0... Loading/unloading lock device, 701... Box-shaped main body,
702...Primary opening/closing door, 703...Secondary opening/closing door,
704... Traverse device, 705... Transfer device, 70
6... Lid opening/closing device, 707... Decontamination device.

Claims (1)

[Claims] 1. A primary opening/closing door is provided on one side of a box-like body, a secondary opening/closing door is provided on the opposite side, and a traversing device is provided at the bottom of the body, and the traversing device traverses inside and outside of the main body. What is claimed is: 1. A loading/unloading lock device comprising: a transport device; and an opening/closing device for opening and closing a lid of a container, and a decontamination device for decontaminating imported items, at the upper part of the main body. 2. The loading/unloading lock device according to claim 1, wherein at least one of the primary opening/closing door and the secondary opening/closing door is in a closed state. 3. The loading/unloading lock device according to claim 2, wherein the opening/closing door is automatically opened/closed by remote control. 4. The loading/unloading lock device according to claim 1, wherein the traversing device comprises a chain driven by a drive motor and a transfer device that traverses in and out of the box-like body by driving the chain. 5. The loading/unloading lock device according to claim 1, wherein the transfer device has a nut fixed to the underside of the table and a long screw rotated by a drive motor.