JPH0766077B2 - Radioactive waste crushing volume reduction device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) A large amount of radioactive waste, which is difficult to reduce in volume, is generated in nuclear facilities, and its disposal method is a problem.

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

(Prior art) In conventional nuclear facilities, radioactive waste that is difficult to reduce in volume, such as rubber gloves, RI shoes, plastic containers, PVC hose,
The wood, etc. was pressed to reduce the volume as much as possible, packed in drums, sealed, and stored in a predetermined place.

However, while this method increased the number of drums, there was a need for a reduction method.

(Problems to be Solved by the Invention) It is intended to reduce the volume of radioactive waste that is difficult to reduce in volume as much as possible, and to fill the drums with the increasing number of drums.

(Solution by the Invention) A supply unit, a crushing unit, and a bagging unit are provided, and the supply unit includes a door that can be sealed, and a partition plate that is hinged to an end and can be tilted by an external operation. L which consists of a horizontal part and a vertical part which is orthogonal to this and which can be sucked with a blower through a HEPA filter.
A closed pipe, and the crushing part comprises a crusher provided at the lower end of the vertical part of the L-shaped closed conduit and a discharge pipe provided at the lower part of the crusher and having a closing plate at the lower end. Is characterized by comprising a cylindrical body which is erected on the load cell and is movable between a position directly below the discharge pipe and a bag take-out position.

(Embodiment) FIG. 1 shows a volume reducing apparatus for radioactive waste according to the present invention.
Reference numeral 1 is a supply portion of this volume reducing device, 2 is a crushing portion, and 3 is a bagging portion.

The supply part is at the top of the device and is an L-shaped closed conduit 4
have. The L-shaped closed conduit 4 comprises an upper horizontal portion 4a and a vertical portion 4b which is substantially orthogonal to the upper horizontal portion 4a. Reference numeral 5 is a door that is hinged to the material supply port so that it can be opened and closed. 6 is a partition plate which is hinged to the inner end of the upper horizontal portion 4a,
90 ° can be rotated between a horizontal position indicated by a virtual line position 6'in the figure and a vertical position indicated by a solid line. Reference numeral 7 is a wire fixed to the top of the partition plate 6, penetrating the wall of the closed conduit 4, and again connecting to the outside of the closed conduit 4 and connected to the handle ring 8 at the lower part of the horizontal portion 4a. Then, when the handle ring 8 is pulled, the partition plate 6 stands upright, and when it is released, the partition plate 6 falls down on the horizontal part by the spring provided in the hinge part. 9
Is a duct provided above and behind the vertical portion 4b of the L-shaped closed conduit
The HEPA filter installed at 10 and the 11 blower operates the blower to suck the dust containing the radioactive substance in the L-shaped closed conduit 4 and remove the dust with the HEPA filter to prevent dust scattering. It is supposed to do.

The crushing unit 2 provided at the lower end of the L-shaped closed conduit 4 is provided with a crusher 12 including a large number of rotary blades and fixed blades, and the crusher crushes the waste 20 whose volume is difficult to reduce. 21 is a screen mesh provided in the lower part 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 on the lower side of the crushing unit 2, and a closing plate 14 that can be opened and closed is provided at the lower end.

A cylindrical body 16 holding a vinyl bag 15 is provided in the bag filling section 3 as a discharge pipe 13
And the cylinder 16 is mounted on a load cell 17 concentrically. The load cell 17 is a load cell setting device shown in FIG.
When the set value set in 18 is reached, the closing plate 14 is closed to prevent the crushed waste from dropping into the vinyl bag 15 any further.

When a certain amount is charged, the cylindrical body 16 moves to the left in FIG. 1 and is taken out with the mouth sealed and stored in a drum can.
Reference numeral 19 is a drive motor for the crusher 12.

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

The dropped waste 20 is crushed in the crushing section and becomes particles having a mesh diameter of the screen mesh 21 or less, and falls and collects on the closing plate 14. When the vinyl bag 15 is set in the tubular body 16 on the load cell 17, the closing plate 14 is opened, and the crushed waste falls into the vinyl bag 15. Then, when the load cell 17 reaches a predetermined set value, the closing plate 14 closes and does not drop further.

The cylindrical body 16 accommodating the predetermined amount of the vinyl bag 15 is moved to the side, and the mouth of the vinyl bag 15 is sealed and taken out.

During this work, the dust generated in the part of the crusher 12 in the L-shaped closed conduit 4 and sucked up is sucked by the blower 11, and the HEPA filter 9
Filtered.

In the case of wood, the wood pieces crushed by the crusher 12 do not pass through the screen mesh and fall directly into the discharge pipe 13.

(Effect) It is composed of the supply unit 1, the crushing unit 2 and the bagging unit 3. The supply unit can seal the supply port with the door 5 and the dust can be filtered by the HEPA filter, so that the dust containing the radioactive substance is included. Does not scatter.

Since the crusher can be crushed with a rotary blade and a fixed blade,
Volume can be reduced with a large volume reduction rate.

Since the set amount of the reduced volume can be immediately stored in the plastic bag, there is no trouble such as puncture of the plastic bag, and the bag can be efficiently stored in the drum because it is taken out as a bag body containing a certain amount of waste.

By the way, the following table shows the results of confirmation of the pulverized state when 7 types of test materials were used and treated with the volume reducing apparatus according to the present invention.
As is apparent from the volume reduction ratio (%) in this table, it is understood that the volume has been considerably reduced and the intended purpose of the invention has been achieved.

[Brief description of drawings]

 FIG. 1 is a sectional view of a volume reducing device according to the present invention. FIG. 2 is a perspective view of the same. In the figure; 1 ... supply section, 2 ... crushing section, 3 ... bagging section, 4 ... L-shaped closed conduit 4a ... horizontal section, 4b ... vertical section, 5 ... door, 6 ... partition plate 7 ...... Wire, 8 …… Handle ring 9 …… HEPA filter, 10 …… Duct 11 …… Blower, 12 …… Crusher 13 …… Discharge pipe, 14 …… Closing plate 15 …… Plastic bag, 16 …… Cylinder Body 17 …… Load cell, 18 …… Load cell setting device 19 …… Drive motor, 20 …… Waste 21 …… Screen mesh

Claims (3)

[Claims] 1. A supply unit (1), a crushing unit (2) and a bagging unit (3), the supply unit (1) having a sealable door (5) and having an end portion. A horizontal part (4a) equipped with a partition plate (6) that is hinged and can be tilted by an external operation, and
It consists of an L-shaped closed conduit (4) consisting of a vertical part (4b) that can be sucked by a blower (11) through a HEPA filter (9), and a crushing part (2) is a vertical part of the L-shaped closed conduit (4). A crusher (12) provided at the lower end of the crusher and a discharge pipe (13) provided at the lower part of the crusher and having a closing plate (14) at the lower end,
The bagging part (3) is erected on the load cell (17) and is movable between the position directly below the discharge pipe and the bag take-out position (16).
A crushing and reducing apparatus for radioactive waste characterized by comprising: 2. A load cell (17) having a setting device (18) for setting a predetermined weight, wherein the closing plate (14) is opened and closed by a signal from the load cell (17). The apparatus for crushing and reducing radioactive waste according to the item [I]. 3. A screen mesh (21) at the bottom of the crusher.
The radioactive waste crushing and reducing apparatus according to claim [I], characterized in that: