JPH06138296A - Facility for carrying radioactive waste out of processing chamber - Google Patents

Abstract

PURPOSE:To provide facilities for carrying radioactive wastes out, which can prevent contamination due to leaks from the inside of a container when carrying the radioactive wastes from the inside of a processing chamber, enclosing the wastes in the container and carrying the container out, and can also prevent contamination of the surface of the container when enclosing the radioactive wastes in the container. CONSTITUTION:In facilities for carrying radioactive wastes R out, wherein the radioactive wastes R to be disposed from the inside of a processing chamber 3 are enclosed in an internal container 1 which is carried into a disposal chamber 4 and transferred below the disposal opening 16 of the processing chamber 3, and at a contamination inspection room 6 the internal container 1 is enclosed in an external container 2, a cover 9 is provided for hermetically closing an inlet 12 by pressing it against the internal container 1 from above, and a pressing means for pressing the cover 9 by raising and lowering the disposal opening 16 is provided inside the processing chamber 3. A filling sleeve 19 which can be raised and lowered is provided at the outside bottom of the disposal opening 16 located on the side of the disposal chamber 4, and a cargo handling means 26 for enclosing the internal container 1 which has passed contamination checking into the external container 2 is provided inside a contamination checking room 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for carrying out radioactive waste from a processing chamber. More specifically, the present invention relates to a radioactive waste that has been processed into a predetermined size or weight by processing such as cutting by remote control in the processing chamber. The present invention relates to a facility for remotely storing an object in a container and carrying it out of a processing chamber.

[0002]

2. Description of the Related Art When carrying out radioactive waste in a processing chamber to the outside, it is necessary to carry it out without contaminating other rooms in the carrying-out process, and the mechanism shown in FIGS. Practical or considered.

The mechanism shown in FIG. 3 is based on vinyl chloride (hereinafter referred to as PV
A mechanism used to carry out a relatively heavy radioactive waste from a processing chamber using a bag,
An opening of the PVC bag 31 is airtightly held by a flange 34 formed on the outer periphery of the upper surface of a carry-out port 33 formed in the ceiling of the processing chamber 32, and a bag body 35 is vertically installed in the processing chamber. This gives P
Since the hanging tool 36 attached to the inner bottom of the VC bag 31 hangs down in the processing chamber, the rope 37 hanging the radioactive waste R on the hanging tool 36 is slung by a manipulator (not shown) installed in the processing room. (See Figure 3a). After this, P
When the suspension ring 38 attached to the outer bottom of the VC bag 31 is lifted to a predetermined position by a crane or the like, the radioactive waste R is suspended in the PVC bag 31 together with the rope 37. The part (mouth side) is airtightly closed and cut from the lower part of the block (see FIG. 3b). As a result, radioactive waste R and contaminated rope 37
Etc. are hermetically housed in the PVC bag 31 and carried out to the outside.

The mechanism shown in FIG. 4 is a mechanism used to carry out a relatively lightweight radioactive waste from the processing chamber. First, a can lid 41 is hermetically attached by an O-ring 42.
43 is a mounting portion 46 formed outside the disposal port 45 of the processing chamber 44.
It is airtightly attached to the lock mechanism. At this time, the can lid 41 is also connected to the lid 47 provided on the dumping port 45 by the lock mechanism. Then, the can lid 41 is closed by pulling up the lid 47 with a manipulator (not shown) from the inside of the processing chamber.
It can be opened together with 47 (see Fig. 4a). Then, the radioactive waste R is put into the can 43 by the manipulator, and the integrated lid 47 and can lid 41 are attached to the dumping port 45 and the can 43, respectively (see FIG. 4b). Then, the lock mechanism is released and the can 43 and the can lid 41 are removed from the mounting portion 46 in the reverse order of the mounting procedure (see FIG. 4c). As a result, the radioactive waste R is hermetically housed in the can 43 and carried out to the outside.

The mechanism shown in FIG. 5 is a mechanism that has been proposed as a concept. The mechanism 52 forms a dumping port 52 for radioactive waste R on the floor of the processing chamber 51, and dumps it below the outer bottom of the processing chamber 51. A chamber 53 and a lid closing chamber 54 are provided, and a decontamination chamber 55 and an outer chamber 56 are connected in this order to the lid closing chamber 54 and the airtight doors 57a and 57b are provided between the chambers.
In the container 58 that is installed by partitioning with, and is installed in the dump chamber 53,
The radioactive waste R is thrown into the container 58 through the dump port 52 having the lid 59 opened by a manipulator (not shown). Next, the container 58 is transferred to the lid closing chamber 54, where the lid 59 of the container 58 is closed by a manipulator (not shown). After this,
The container 58 is transferred from the lid closing chamber 54 to the decontamination chamber 55 by opening the airtight door 57a, and the decontamination chamber 55 removes contamination on the container surface. After decontamination, the container 58 is transferred from the decontamination chamber 55 to the outer chamber 56 by opening the airtight door 57b. As a result, the radioactive waste R is hermetically housed in the container 58 and carried out to the outside.

[0006]

However, the above-mentioned mechanism has the following problems and is not always sufficient.

That is, in the case where the PVC bag 31 is used, the PVC bag is provided with the hanging tool 36 and the hanging ring 38 each time.
It is necessary to attach 31 to the flange 34 of the carry-out port 33 in an airtight manner and cut it after the radioactive waste R is stored, and automation is impossible. For this reason, the work efficiency is poor and the burden on the worker is high, and it cannot be carried out about once a day. Further, when the radiation dose rate of the radioactive waste R is high, it is necessary to handle a heavy shielding cask together, which further deteriorates the work efficiency.

In the case of using the can 43, since the prevention of the spread of contamination depends on the soundness of the O-ring 42, it may be difficult to secure the soundness when handling the heavy radioactive waste R.

In the case of using the decontamination chamber 55, the container surface in the dump chamber 53 is exposed to a contaminated atmosphere,
Even if the container surface is decontaminated in the separate decontamination room 55, the decontamination is not sufficiently performed, and there is a high possibility that the container surface is transported to the outer chamber 56 while being contaminated.

In view of the above-mentioned problems, the present invention has been made by improving the facility for carrying out radioactive waste from a treatment chamber of a system which employs a decontamination chamber. When radioactive waste is stored in a container and is carried out to the outside, contamination from leakage inside the container is caused, as well as radioactive contamination from the processing chamber that prevents contamination on the surface of the container when the radioactive waste is stored in the container. It is to provide a facility for carrying out waste.

[0011]

In order to achieve the above object, the facility for carrying out radioactive waste from the processing chamber of the present invention forms a radioactive waste dumping port on the floor of the processing chamber and treats it. A dumping chamber is provided below the outer bottom of the chamber, and a decontamination chamber, a contamination inspection chamber, and an external chamber are provided in this order and connected in this order, and each chamber is partitioned by an airtight door, while being carried into the dumping chamber. The radioactive waste discharged from the disposal port of the processing chamber is stored in the inner container transferred under the mouth, and this inner container is stored in the outer container in the contamination inspection room and is carried out to the outer chamber. A facility for discharging waste, which is provided with a lid that airtightly closes the input port by pressing the inner container from above, and a pressing unit that raises and lowers the disposal port in the processing chamber and presses the lid. Provided, and can be moved up and down on the outer bottom of the dump port on the dump room side Another provision of the Do-filled sleeve, the contaminated laboratory is made by providing a handling means for containing the inner vessel which pass by contamination monitoring outside the container.

Further, in the above equipment, in the decontamination room,
An inner container tray capable of reciprocating between the contamination inspection chamber and mounting the decontaminated inner container for transfer to the contamination inspection chamber, and a cargo handling means for mounting the inner container on the tray are provided. May be.

[0013]

In the above structure, the inner container and the outer container are used, and the inner container is provided with the lid that hermetically closes the inlet by simply pressing from above. The lid can be easily placed by pressing and pressing the lid on the inlet of the inner container by remote control from the inside, which allows the lid to be placed immediately after the radioactive waste is stored. The spread of contamination on the surface of the inner container can be prevented.
In addition, since this inner container is transferred to the decontamination room and then to the contamination inspection room, only those that have passed the contamination condition on the surface of the inner container are enclosed and sealed in the outer container and carried out to the outer chamber. It is possible to carry out radioactive waste to the outside room without leaking to the room.

Further, on the outer periphery of the input port of the inner container which is carried into the dump chamber and transferred below the dump port, a filling sleeve provided on the outer bottom of the dump port of the dump chamber so as to be able to move up and down is set. Therefore, contamination of the surface of the inner container at the time of inputting radioactive waste can be reduced.

Further, by providing the decontamination chamber with an inner container tray capable of reciprocating between the decontamination chamber and mounting the decontaminated inner container and transferring it to the contamination inspection chamber, by any chance Even if the surface contamination is detected in the inspection and the inner container is sent back to the decontamination chamber again, the equipment such as the container transfer device in the contamination inspection chamber can be prevented from being contaminated.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a facility for carrying out radioactive waste from a processing chamber according to the present invention.

In the figure, 1 is an inner container, 2 is an outer container, 3
Is a treatment room, 4 is a disposal room, 5 is a decontamination room, 6 is a contamination inspection room,
Reference numeral 7 indicates an outside room and 8A to 8C indicate airtight doors.

As shown in FIG. 2, the inner container 1 is composed of a lid 9 and a container body 10, a convex portion 11 is formed on the inner periphery of the lid 9, and an outer periphery of an inlet 12 of the container body 10 is formed. A concave portion 13 is formed, and by pressing the lid 9 from above, the convex portion 11 is fitted into the concave portion 13 so that the lid can be airtightly closed. On the other hand, the outer container 2 is composed of a drum can 15 having a lid 14.

The processing chamber 3 has a conventional structure. Although not shown, the processing chamber 3 is equipped with a cutting machine, a carrier, a manipulator, etc., which are operated by remote control, and the radioactive waste R carried in is disposed. Processing or the like is performed so as to obtain a predetermined size or weight. Further, in the present invention, the floor 16 of the processing chamber 3 is provided with the disposal port 16 for the processed radioactive waste R.

The dumping chamber 4 is located below the processing chamber 3 and in the inner container 1.
Is provided so that it can be carried in, and a conveyor 17 for transferring the inner container 1 is installed on the floor surface. Further, as shown in FIG. 2, a funnel-shaped filling sleeve 19 which can be moved up and down by a cylinder 18 is provided on the outer bottom of the dumping port 16 of the processing chamber 3.

The decontamination chamber 5 is provided next to the dumping chamber 4 via an airtight door 8A, and on the floor surface of this chamber 5, a conveyor 20 for transferring the inner container 1 is provided in a line from the dumping chamber 4. A decontamination device 21 is installed beside the transfer conveyor 20 on the way. In addition, a conveyor for transportation near the contamination inspection room 6
A tray 22 for mounting and transferring the inner container 1 is provided on the upper portion 20, and a remotely operated crane 23 for transferring the inner container 1 onto the tray 22 is provided above the tray 22.

The contamination inspection room 6 has an airtight door 8B next to the decontamination room 5.
The decontamination chamber 5 is lined up on the floor of the decontamination chamber 5 and a transfer conveyor 24 for the inner container 1 is installed on the floor surface of the decontamination chamber 5 and is transferred on the tray 22 from the decontamination chamber 5. An inspector 25 for inspecting the surface of the inner container 1 for contamination is equipped. Further, the drum can 15 as the outer container 2 is loaded and placed on the transfer conveyor 24, and the inner container 1 is placed above the drum can 15.
Is equipped with a remotely operated crane 26 for housing the drum can 15 and a remotely operated manipulator (not shown) for placing the lid 14 on the drum can 15.

The outer chamber 7 is provided next to the contamination inspection chamber 6 via an airtight door 8C, and a conveyor 27 for transferring the outer container 2 is provided on the floor of the chamber 7 in a line from the contamination inspection chamber 6. is set up.

The radioactive waste R is carried out of the processing chamber 3 in the above equipment to the outer chamber 7 as follows.

First, the inner container 1 having the lid 9 placed on the input port 12 of the container body 10 is carried into the dump chamber 4, and the transfer conveyor 17 is operated to move it below the dump port 16 of the processing chamber 3. set. Next, the cylinder 18 is operated to lower the filling sleeve 19 onto the inner container 1 on the outer peripheral side of the charging port 12. Thereafter, the manipulator or the like in the processing chamber 3 is operated to open the lid of the dumping port 16 and the lid 9 of the inner container 1 is taken into the processing chamber 3. In this state, the radioactive waste R in the processing chamber 3 is thrown into the inner container 1 by operating a manipulator or the like. After discarding, the lid 9 taken into the processing chamber 3 is returned to the top of the input port 12 of the inner container 1 by operating a manipulator or the like, and pressed from above so that the convex portion 11 formed on the inner periphery of the lid 9 is It is fitted in a recess 13 formed on the outer periphery of the charging port 12 and is hermetically closed.

Thereafter, the cylinder 18 is operated to raise the filling sleeve 19 above the inner container 1, the inner container 1 is driven by the transfer conveyor 17, and the airtight door 8A is opened to remove the inner container 1 from the dump chamber 4. Transfer to dyeing room 5.

In the decontamination chamber 5, the inner container 1 is transferred to a decontamination device 21 provided on the side of the transfer conveyor 20 by a crane 23 that is remotely operated, and contaminants adhering to the surface there are contaminated. Is sufficiently removed. Thereafter, the crane 23 places the tray 22 on the transfer conveyor 20, and the airtight door 8B is opened to drive the transfer conveyor 20 to transfer the trays 22 to the contamination inspection chamber 6.

In the contamination inspection room 6, the inner container 1 is transferred from the tray 22 to the inner container surface inspection device 25 by a crane 26 which is remotely operated, and the surface contamination state is inspected there. In this inspection, most of the products pass the inspection because the decontamination in the previous process is sufficient. The inner container 1 that has passed the test is then transferred to the drum 26 whose outer surface is clean by the crane 26.
The lid 14 is housed in the drum 15, and the lid 14 is airtightly closed to the drum can 15 by remote control and transferred to the outer chamber 7. On the other hand, if the contamination inspection fails, it can be returned to the tray 22 and sent back to the decontamination chamber 5 for re-decontamination.
Contamination of equipment such as the container transfer device inside is prevented.

In the above embodiment, the cylinder 18 is used to raise and lower the filling sleeve 19, but the present invention is not limited to this example. For example, instead of the cylinder 18, the disposal chamber 3 is dumped. An airtight space may be formed between the outer peripheral portion of the cylinder protruding from the outer bottom of the mouth 16 and the upper inner periphery of the filling sleeve 19, and air may be supplied to and exhausted from the airtight space to move up and down.

[0030]

As described above, according to the facility for carrying out radioactive waste from the processing chamber according to the present invention, the inner container and the outer container are used, and the inner container is provided with a charging port only by pressing from above. Since it is provided with a lid for airtightly closing, the lid can be easily placed by placing the lid on the inlet of the inner container and pressing it by remote control from the inside of the processing chamber after containing the radioactive waste, As a result, the lid can be formed immediately after the radioactive waste is stored, so that the spread of contamination on the surface of the inner container during the transfer from inside the inner container can be prevented. In addition, since this inner container is transferred to the decontamination room and the contamination inspection room, and only the one whose contamination state on the surface of the inner container has passed is contained and sealed in the outer container and carried out to the outer chamber,
The radioactive waste can be carried out to the outside room without leaking the radioactivity in the processing room to the outside room.

Since the inner container tray capable of reciprocating between the decontamination chamber and the contamination inspection chamber is provided, surface contamination may be detected in the contamination inspection and the inner container may be sent back to the decontamination chamber. However, it is possible to prevent the spread of contamination to the equipment such as the container transfer device in the contamination inspection room, and also to prevent the contamination of the outer container carried out from the contamination inspection room.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a facility for carrying out radioactive waste from a processing chamber according to the present invention.

FIG. 2 is an enlarged explanatory view of a main part of FIG.

3A and 3B are schematic diagrams of a mechanism for carrying out radioactive waste from a processing chamber using a PVC bag, in which FIG. 3A is a schematic diagram before storage and FIG. 3B is a schematic diagram after storage.

FIG. 4 is a schematic diagram of a mechanism for carrying out radioactive waste from a processing chamber using a can, (a) is a schematic diagram before storage, (b) is a schematic diagram during storage, and (c) is storage. FIG.

FIG. 5 is a schematic view of a mechanism for carrying out radioactive waste from a processing chamber using a can, in which a disposal chamber, a lid closing chamber, a decontamination chamber, and an outer chamber are connected in this order in addition to the processing chamber.

[Explanation of symbols]

1: Inner container 2: Outer container
3: Treatment room 4: Disposal room 5: Decontamination room
6: Contamination inspection room 7: Outside rooms 8A, 8B, 8C: Airtight door
9: Inner container lid 10: Inner container container body 11: Convex portion 1
2: Input port 13: Recessed portion 14: Drum can lid 1
5: Drum can 16: Disposal port 17, 20, 24, 27: Conveyor for transfer 18: Cylinder 19: Filling sleeve 2
1: Decontamination device 22: Tray 23, 26: Crane 2
5: Contamination tester

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Wada 1-18-3 Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo Kobe Steel Works, Kobe Head Office

Claims (2)

[Claims] 1. A disposal port for radioactive waste is formed on the floor of the processing chamber, and a disposal chamber is provided below the outer bottom of the processing chamber, and a decontamination room, a contamination inspection room, and an outside room are connected to the disposal chamber. In this order and while partitioning each room with airtight doors, the radioactive waste dumped from the disposal port of the processing chamber is stored in the inner container that has been carried into the disposal chamber and transferred below the disposal port. A facility for carrying out radioactive waste from a processing chamber in which a container is housed in an outer container in a pollution inspection room and carried out to the outer chamber, and a lid for hermetically closing an input port by pressing the inner container from above. In addition to providing a pressing means for raising and lowering the dump port in the processing chamber to press the lid, further provided with a movable filling sleeve on the outer bottom of the dump port on the dump chamber side, in addition to the contamination inspection chamber Stores the inner container that passed the contamination inspection in the outer container A facility for carrying out radioactive waste from a processing chamber, characterized by being provided with a cargo handling means. 2. An inner container tray capable of reciprocating between the contamination inspection chamber and the decontamination inner container, and transferring the decontaminated inner container to the contamination inspection chamber, and an inner container in the tray. 2. A facility for carrying out radioactive waste from the processing chamber according to claim 1, further comprising: a cargo handling means for mounting.