JPH0572999B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a transfer/unloading device installed in a nuclear reactor disassembly equipment and used for loading/unloading a reactor wall block container and replacing a burning burst stocker. .

(Prior Art) In order to dismantle a nuclear reactor, it is necessary to completely protect human bodies and the atmosphere from radioactive contamination. Therefore, the upper part of the reactor is covered and sealed with a gantry frame, and each mechanical device is driven by remote control via a main shaft installed vertically inside the reactor. (hereinafter referred to as the furnace wall) must be cut automatically and mechanically.

On the other hand, transporting the cut reactor wall blocks out of the gantry frame must be carried out in a state where radioactive contamination is completely eliminated. The same applies when replacing the stocker of the burning bar. For this reason, conventionally, locking devices have been used as the only communication and disconnection devices in enclosures and gantry frames.

(Problems to be Solved by the Invention) As mentioned above, if the inside and outside of the enclosure are communicated and cut off only by the locking device, the leakage of radioactivity to the outside will be greatly influenced by the blocking performance of the locking device. There was a problem.

(Means for Solving the Problems) Therefore, in order to solve the above problems, the present invention has developed a furnace wall block transfer/unloading device that does not rely solely on the blocking performance of the locking device, but also uses a secondary system installed outside the gantry frame. Communicated with the elevator room through a door,
Containers and stockers are transported and carried out by shutting off and then raising and lowering the elevator in the elevator room, and the final transport to the outside is through the carry-out door of the elevator room.
By means of this transfer/unloading device, radioactive contamination can be more completely eliminated during unloading of reactor wall blocks and replacement of stockers.

(Example) The transfer/unloading device of the present invention will be described below based on the drawings.

FIG. 1 is a schematic front view illustrating the entire nuclear reactor dismantling apparatus.

Further, FIG. 2 is a sectional view taken along the line A--A in FIG. 1.

The dismantling equipment has a shutoff building 10 installed above the reactor 1, and the inside thereof is covered and sealed with a gantry frame 11 which also serves as a primary enclosure. A main shaft 20 is vertically installed inside the cavity via a lifting device 12 and a turning device 13 provided on the gantry frame 11.
A horizontal cutting machine 30 is provided at the bottom of the main shaft 20, while mechanical devices such as a vertical cutting machine 40 and a gripping machine 50 are housed in the upper part of the gantry frame 11. Side wall 1 of gantry frame 11
1a is provided with a locking device 60 extending therethrough. This locking device 60 has a primary door d ₁ on the inside of the gantry frame 11 and a secondary door d ₂ on the outside.
are placed. The primary door _d1 connects and blocks communication between the inside of the gantry frame 11 and the inside of the lock device 60 by opening and closing it.

On the other hand, an elevator room 70 is provided close to the secondary door d ₂ side of the locking device 60, and the secondary door d ₂
By opening and closing the lock device 60 and the elevator room 70, communication and isolation are achieved. Also, inside the locking device 60 are an opening/closing device 61 for opening and closing the lid of a container carried in, and a decontamination device 6 for cleaning the container.
2 are deployed. Furthermore, a stocker exchange room 80 and a transfer table 90 are provided in the lower part of the elevator room 70.

FIG. 3 is an enlarged side sectional view of only the transfer/unloading device in FIG. 1. Moreover, FIG. 4 is a sectional view taken along line B-B in FIG. 3, and FIG. 5 is a cross-sectional view taken along line C-C in FIG.
FIG. 6 is a sectional view taken along the line D-D.

That is, based on these sectional views, the lock device 60, elevator room 70, stocker exchange room 8
0 and the transfer table 90 will be explained. As described above, the locking device 60 provides communication between the primary door _d1 disposed within the gantry frame 11 and the elevator room 70;
A secondary door _d2 for blocking is provided. Further, an opening/closing device 61, a decontamination device 62, and a transfer device 63 are provided inside the device. Opening/closing device 61
The lid of the container is hung with hooks 61a, 61a, and opened and closed by raising and lowering it with a winch 61b. On the other hand, the decontamination device 62 is formed by a pair of vertically rotating brushes 62a, 62a and horizontally rotating brushes 62b, 62b, and the container is passed between the vertically and horizontally arranged rotating brushes to completely clean the container. be. Transfer within the lock device 60 is carried out by a transfer device 63. The transfer device 63 has a plurality of drive rollers R, R, etc. arranged in parallel that rotate in the transfer direction, and containers and stockers are transported by the transfer device 6.
3, the paper is transferred in a predetermined transfer direction by drive rollers R, R, . . . .

The elevator room 70 is used to raise and lower an elevator 71 using an elevator winch 72. The elevator 71 is also provided with a transfer device in which drive rollers R, R, . On the other hand, there is a partition door at the bottom of the elevator room 70.
A stocker exchange room 80 is provided which is communicated with and disconnected from the elevator room 70 by opening and closing _d3 . Also, a transfer device 81 is installed at the bottom of the stock exchange room 80.
This transfer device 81 also has a plurality of driving rollers R, R, . . . arranged in parallel as described above. Moreover, a stock transport winch 82 is installed at the top.
The stocker of the burning bar to be replaced is lifted up by this winch, placed on the transfer device 81, and moved to the elevator 7 by driving the drive rollers R, R...
1. Further, in the lower part of the elevator room 70, an ejection door _d4 is provided on the wall surface corresponding to the partition door _d3 . A transfer table 90 is arranged in front of the carry-out door _d4 , and a plurality of driving rollers R, R, . . . are arranged in parallel on this transfer table 90 as well.

Next, using the transporting and unloading device of the present invention, the operations of transporting a container and replacing a stocker will be explained.

The empty container is placed on the transfer table 90, and the carry-out door _d4 is opened. This container is driven by rollers R and R.
... is transferred onto the elevator 71. That is, the elevator 71 is raised, the secondary door _d2 is opened, and the container is carried into the lock device 60. It is preferable to close the carry-out door _d4 before opening the secondary door _d2 . The lid of the container carried into the lock device 60 is lifted by the opening/closing device 61 and opened. Next, open the primary door _d1 and transfer the device 63.
transport it into the gantry frame 11. At this time, close the secondary door _d2 in advance. Then, the furnace wall block is placed into the container conveyed into the gantry frame 11 via the gripper 50. After a predetermined amount of furnace wall blocks have been put in, the primary door d ₁ is opened again.
is opened and carried into the lock device 60 by driving rollers R, R, . . . of the transfer device 63. Immediately after loading the container into the lock device 60, the primary door _d1 is closed. Then, the lid that has been lifted by the opening/closing lid 61 is lowered to seal the container. Next, while being transferred by the transfer device 63, decontamination is performed by the decontamination device 62. After the decontamination treatment is completed, the secondary door _d2 is opened and the patient is transferred to the waiting elevator 71. The elevator 71 is lowered, the delivery door _d4 is opened, and the product is transferred onto the transfer table 90 by drive rollers R, R, . . .

The reactor wall block contaminated with radioactivity as described above is completely sealed in a container and transported outside, and during the process of transporting the container, multiple opening/closing doors d ₁ , d ₂ , d ₄ are used. This makes it possible for the enclosure 10 to completely prevent radiation leakage from the gantry frame 11. On the other hand, when replacing the stocker of the burning bar, the stocker is lifted up by the transport winch 82 and suspended onto the transfer device 81. Then, the partition door _d3 is opened, and the material is transferred onto the elevator 71 by drive rollers R, R, . . . . Next, the elevator 71 is raised, the secondary door _d2 is opened, and the stocker is transferred onto the transfer device 63 of the lock device 60 by the driving rollers R, R, . . . of the elevator 71. The transfer device 63 feeds out the stocker into the gantry frame 11 with the primary door _d1 open. In this state, the stocker is gripped by the gripper 50, and the horizontal cutting machine 3
0 or the empty stocker of the vertical cutting machine 40.

(Effects of the Invention) As explained above, the transfer/unloading device of the present invention is provided so that the gantry frame and the lock device can be communicated and disconnected by the primary door, and the lock device and the elevator room are communicated by the secondary door. In addition to being set up so that it can be shut off, a stocker exchange room is formed at the bottom of the elevator room that is communicated and shut off by a partition door, and a transfer table is installed in front of the carry-out door, making it easy to transfer containers and exchange stockers. In this case, each door performs the blocking function redundantly, so that sufficient airtightness within the enclosure and gantry frame can be ensured. This prevents accidents such as leakage of radioactivity when moving reactor wall blocks, machinery, equipment, etc. in and out, and demolition work can be carried out while being completely protected from radioactive contamination.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view illustrating the entire nuclear reactor disassembly equipment, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. The side sectional view shown in FIG. 4 is B- in FIG. 3.
The sectional view taken along the line B, FIG. 5, is the C-
The C-line arrow sectional view, FIG. 6, is the D- in FIG. 3.
It is a sectional view taken along the line D. 60...Lock device, 61...Switching device, 62
... Decontamination equipment, 63 ... Transfer device, 70 ... Elevator room, 71 ... Elevator, 80 ... Stock exchange room, 81 ... Transfer device, 90 ... Transfer table, d ₁ ... Primary door, d ₂ ...Secondary door, _d3 ...Partition wall, _d4 ...Export door, R, R...Drive roller.

Claims (1)

[Scope of Claims] 1. Disassembly in which the upper part of the reactor is covered with a gantry frame, a main shaft is suspended in the reactor by a lifting device installed on the gantry frame, and mechanical equipment is raised and lowered through the main shaft. In the device, a locking device is disposed so that the inside and outside of the gantry frame communicate with each other, and a primary door is provided on the inside to communicate and cut off the gantry frame and the locking device, and on the outside near the locking device. A secondary door is provided that communicates with and is isolated from the elevator room, and a stock exchange room that communicates with and is isolated from the elevator room by a partition door is provided at the bottom of the elevator room, and a transfer table is provided in front of the carry-out door. Transfer and unloading device. 2. The transport and unloading system according to claim 1, wherein the locking device is provided with an opening/closing device for opening and closing the lid of a container carried in, a transfer device for transferring the container, and a decontamination device for cleaning the container. Device. 3. The transport system as set forth in claim 1, wherein the elevator room and the stocker exchange room are configured to be able to communicate with each other and be disconnected by opening and closing a partition door, and are also provided with a transport device. Device. 4. The transfer/unloading device according to claim 2 or 3, wherein the transfer device provided in the lock device, the elevator, and the stocker exchange room is formed by arranging a plurality of drive rollers in parallel. .