JPS6333699A - Radioactive waste crushing volume-reducing device - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) Nuclear facilities generate large amounts of radioactive waste that is difficult to reduce in volume, and how to dispose of it has become a problem.

The present invention relates to a crushing and volume reduction device for crushing and reducing the volume of radioactive waste that is difficult to reduce in volume and reducing the number of drums produced.

(Prior art) In the past, at nuclear facilities, radioactive waste that was difficult to reduce in volume, such as rubber gloves, RI shoes, plastic containers, PVC hoses, and wood, was reduced in volume as much as possible by pressing, etc., and then packed in drums and sealed. It was stored in a designated place.

However, as this method increases the number of drums, there is a need for a method to reduce the number of drums.

(Problems to be Solved by the Invention) This invention attempts to reduce the volume of radioactive waste that is difficult to reduce as much as possible and pack it into drums, thereby reducing the ever-increasing number of drums generated.

(Solving Means by the Invention) It is composed of a supply section, a crushing section, and a bagging section, and the supply section is equipped with a sealable door and a partition plate that is hinged at the end and can be raised and folded by external operation. horizontal part, and perpendicular to this is the HEPA
It consists of an L-shaped sealed conduit consisting of a vertical section that can be suctioned by a blower through a filter, and the crushing section includes a crusher installed at the lower end of the vertical section of the L-shaped sealed conduit, and a crusher installed at the bottom of the crusher. It is characterized in that it consists of a discharge pipe with a closing plate at its lower end, and the bag filling part consists of a cylindrical body that stands upright on a load cell and is movable between a position directly below the discharge pipe and a bag removal position.

(Example) FIG. 1 shows a radioactive waste volume reduction apparatus according to the present invention.

1 is a supply section of this volume reduction device, 2 is a crushing section, and 3 is a bagging section.

The supply section is located at the top of the device and is an L-shaped sealed conduit 4.
have. The L-shaped sealed conduit 4 consists of an upper horizontal portion 4a and a vertical portion 4b substantially orthogonal thereto. 5 is a door hinged to the material supply port so that it can be opened and closed, and can be opened and closed. Reference numeral 6 denotes a partition plate hinged to the inner end of the upper horizontal portion 4a, which can be rotated by 90 degrees between a horizontal position indicated by a phantom line 6' in the figure and a vertical position indicated by a solid line.

A wire 7 is fixed to the top of the partition plate 6, passes through the wall of the sealed conduit 4, wraps around the outside of the sealed conduit 4 again, and is connected to the handle ring 8 at the lower part of the horizontal portion 4a. When the handle ring 8 is pulled, the partition plate 6 stands upright, and when it is released, the partition plate 6
The spring installed on the hinge allows it to fall flat on a horizontal surface. 9 is a HEPA filter installed through a duct 10 provided at the rear of the upper part of the vertical portion 4b of the L-shaped sealed conduit; 11 is a blower; by operating the blower, radioactivity inside the L-shaped sealed conduit 4 is removed. Dust containing substances is sucked in and removed using a HEPA filter to prevent dust from scattering.

The crushing section 2 provided at the lower end of the L-shaped sealed conduit 4 is equipped with a crusher 12 consisting of a large number of rotating blades and fixed blades.
The waste material 20 whose volume is difficult to reduce is crushed by the crusher. 2
1 is a screen mesh provided at the bottom of the crusher.

However, the screen mesh 21 may not be attached when crushing wood or the like.

Reference numeral 13 denotes a discharge pipe provided below the crushing section 2, and a closing plate 14 that can be opened and closed is provided at the lower end.

A cylindrical body 16 for holding a plastic bag 15 is installed concentrically with the discharge pipe 13 in the bagging section 3, and the cylindrical body 16 is connected to the load cell 1.
It's on top of 7. When the load cell 17 reaches the set value set by the load cell setter 18 shown in FIG. 2, the closing plate 14 is closed to prevent the crushed waste from falling into the plastic bag 15 any further.

When a certain amount is added, the cylinder 16 moves to the left in FIG. 1, seals the mouth, and is taken out and stored in a drum.

19 is a drive motor for the crusher 12.

(Function) The door 5 is opened and the bulky radioactive waste 20, which is difficult to reduce in volume, is thrown in. At this time, the partition plate 6 is placed in the state shown by the two-dot chain line in the figure, that is, in the horizontal position 6'. Therefore, when the waste 20 placed on the partition plate 6 reaches a predetermined amount, when the handle ring 8 is pulled manually or automatically, the waste 20 is moved upward on the partition plate 6, and when the partition plate 6 stands upright. All of them fall into the vertical part 4b of the L-shaped sealed conduit 4.

The fallen waste 20 is crushed in the crushing section and becomes particles having a mesh diameter smaller than that of the screen mesh 21.

It falls and accumulates on the closing plate 14. Cylindrical body 1 on load cell 17
When the plastic bag 15 is set in the bag 6, the closing plate 14 opens and the crushed waste falls into the plastic bag 15.

When the predetermined set value of the load cell 17 is reached, the closing plate 14 closes and the load cell 17 does not fall any further.

The cylindrical body 16 containing a predetermined amount of accumulated plastic bags 15 is moved to the side, the opening of the plastic bags 15 is sealed, and the plastic bags 15 are taken out.

During this operation, the dust generated in the crusher 12 part and raised inside the hollow-type sealed conduit 4 is sucked up by the blower 11, and
It is filtered by PA filter 9.

In the case of wood, the wood pieces crushed by the crusher 12 fall directly into the discharge pipe 13 without passing through the screen mesh.

(Effects) The supply section is composed of a supply section 1, a crushing section 2, and a bagging section 3, and the supply port can be sealed with a door 5, and dust can be filtered with a HEPA filter, so dust containing radioactive materials can be removed. There will be no clutter.

Since the crusher can crush with rotating blades and fixed blades,
Volume can be reduced at a large volume reduction rate.

Since a set amount of the reduced-volume material can be immediately stored in a plastic bag, there is no problem such as puncture of the plastic bag, and since the bag is taken out as a bag filled with a certain amount of waste, it can be efficiently stored in a drum.

Incidentally, the table below shows the results of checking the pulverization state when seven types of test materials were used and treated with the volume reduction device according to the present invention.

As is clear from the volume reduction ratio (%) in this table, the volume was considerably reduced and the intended purpose of the invention was achieved.

×Wood is the equivalent value when it is crushed and incinerated.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a volume reduction device according to the present invention. FIG. 2 is also a perspective view. In the figure: 1 supply section 2 crushing section 3 bagging section 4 inside L-shaped sealed conduit 4 horizontal section 4b vertical section 5 door 6 partition plate 7 wire 8 handle ring 9 ) IEPA filter io duct 11
Blower 12 Crusher 13 Discharge pipe 14 Closing plate 15 Plastic bag 16 Cylindrical body 17 Load cell 1
8 Load cell setting device 19 Drive motor 20
Waste 21 Screen mesh and above

Claims (1)

[Claims] [I] Supply section (1), crushing section (2), and bagging section (3)
), the supply section (1) is equipped with a sealable door (5), and a horizontal section (4a) equipped with a partition plate (6) that is hinged at the end and can be raised and lowered by external operation. , orthogonal to this is HEP
It consists of an L-shaped sealed conduit (4) consisting of a vertical part (4b) that can be sucked by a blower (11) through an A filter (9), and the crushing part (2) is the vertical part of the L-shaped sealed conduit (4). The bagging section (3) consists of a crusher (12) installed at the lower end of the crusher, and a discharge pipe (13) installed at the lower end of the crusher with a closing plate (14) at the lower end. A radioactive waste crushing and volume reduction device comprising a cylindrical body (16) erected above and movable between a position directly below the discharge pipe and a bag removal position. [II] Claims characterized in that it has a setting device (18) for setting the load cell (17) to a predetermined weight, and the closing plate (14) is opened and closed by a signal from the load cell (17). The radioactive waste pulverization volume reduction device described in Section I]. [III] The radioactive waste crushing and volume reduction apparatus according to claim [I], characterized in that a screen mesh (21) is provided at the lower part of the crusher.