JPS5853634B2 - Radioactive waste ocean dumping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an apparatus for dumping radioactive waste into the ocean.

Nuclear power plants, nuclear research institutes, nuclear fuel processing facilities, etc. generate various types of radioactive waste, including waste with extremely long half-lives, and even if the radiation dose is low, it is difficult to dispose of it. This is an important safety issue.

Therefore, on land, it is stipulated that radioactive materials be dumped into abandoned mines or in cans and dumped into the deep sea to prevent radioactive materials from leaking.

For this reason, a conventional method has been to pack concrete IJ into drums of a certain standard capacity and transport and dump it into the ocean at a depth above a specified level.

To this end, it is necessary to protect workers from radiation exposure, reduce the number of workers involved, reduce exposure doses by shortening work hours, and ensure that dumping work is carried out safely and quickly in the ocean.

The inventor first developed a unit dumping can body by tightening a plurality of concrete-packed drums containing radioactive waste with bands, and installed this unit dumping can body on a pedestal that ran in the direction of the ship's axis. We proposed that the material be grasped and dumped using the lifting rod of a self-propelled transport device.

However, a unit drum weighs about 500 kg, a unit dumping body made of three drums weighs 1,500 kg, and a unit of four drums weighs about 2,000 kg, making it inconvenient to handle.

Another problem is that the workers who tighten the bands around the drums are exposed to radiation.

There is also the problem that special equipment is required to perform remote band tightening work, which requires considerable expense.

The object of the present invention is to propose a device that eliminates the need for such band tightening work and efficiently and safely stores unit drums in a hold, takes them out, and discharges them overboard.

In short, this invention makes it possible to simultaneously grasp or release a plurality of unit drums by attaching the grasping device according to the present invention proposed by the inventor to the lower end of the lifting rod of the self-propelled conveyance device proposed by the inventor. A short slat conveyor and a discharge chute connected to the end of the conveyor are installed on each side of the conveyor to ensure efficient discharge.Also, it is possible to stack unit drums side by side at equal intervals to facilitate the operation of the grasping device. The device is characterized in that it is designed and equipped with a mount.

An example of a conventional dumping means used in a foreign country will be described below with reference to the drawings.

Drum can 1 containing radioactive waste as shown in Figure 1
A is either rolled horizontally in the hold 2a or stacked vertically with its axis vertical, and when dumping, two workers 3a enter the hold 2a and hook it up as shown in Figure 2. The wires 4b and 4C, which are driven from a derrick (not shown), are used to hang the wires 4a, and then the wires 4b and 4C are used to hang the wires 4a, and then the dumping table 5 is suspended.
The vessel is placed on a ship 3b, pushed and rolled by a worker 3b, and dumped into the sea from the side.

This poses safety problems, such as workers getting their legs caught in the cans by the stacking drums when the ship is rocking, or when the cans are being pushed around.Also, workers are exposed to radiation, although it is basically a weak amount. Moreover, when the amount of radiation exposure is added up, it becomes quite large.

Considering the permissible radiation exposure for workers, this would require a large number of replacement workers, and in any case, it is an unconventional situation in terms of safety.

In addition, for work efficiency, a plurality of 1° unit drums are tied together with a band as shown in Figure 3 or Figure 4 to form the unit dumping can body 1, and a lifting tool with a grasping claw is inserted into the empty space in the center. A method has also been adopted in which the grasping claw is hooked onto the edge of the lid of the unit drum to lift it up.

However, as mentioned above, there are various problems such as radiation exposure due to the band tightening work, the weight of the unit waste can increases, and the need for a remote control device for band tightening.

The present invention eliminates these drawbacks by providing a device for simultaneously grasping or simultaneously discharging a plurality of unit drums, automating and simplifying the dumping work on the side, and using a rack for stacking unit drums at equal intervals. This device is designed to improve the efficiency of loading and dumping operations and ensure worker safety.

First, a self-propelled conveyance device previously proposed by the inventor will be explained with reference to FIG.

Unit dumping cans 1 are stacked vertically in the hold 2 of the hull 5.

In one example, 252 units of dumping can bodies (one unit consists of 4 drums) and approximately 500 tons are stored in one hold.

The self-propelled mount 6 runs on rails 7 in the axial direction of the hull, and a self-propelled transport device 8 is located on this mount. The direction can be rampant.

The self-propelled transport device 8 is provided with a lifting rod 9, and a lifting tool 11 having a grasping claw 10 shown in FIG.

A free roller device 12 is located on the side and protrudes from a position 12', and is used for discharging the unit dumping cans 1.

Monitoring and operation control of these operations are carried out from inside the protective chamber 13 attached to the self-propelled gantry 6 using a television camera.

This invention is the above-mentioned device proposed by the inventor, which is provided with a pedestal for stacking unit drums, a lifting device that enables the grasping and release of multiple drums, a slat conveyor in place of the free roller device, and a discharge chute. This project proposes the structure of a radioactive waste ocean dumping device.

The structure will be explained below with reference to the drawings.

FIG. 7 shows a front view, partially cut away, of the grasping device 14 capable of grasping the time every two hours according to the present invention.

The grasping device 14 is connected to the lifting rod 9 through a flange 15 and suspended.

A lifting frame 16, which is one component of the grasping device 14, is connected to a hanging cylinder 17 through a flange 18, is fixed to the lifting rod 9, and does not move relative to the lifting rod.

The lifting frame 16 has a lug 19a. 19b and 19c are welded and the pin 2 is attached so that the eight crank arms 20 can rotate.
Installed in 1.

The crank arms 20 are arranged in pairs and are clamped at two points per 1° unit drum.

FIG. 7 shows a case in which two unit drums are grasped, and the number of unit drums to be grasped can easily be increased by increasing the number of lugs and crank arms.

Eight hanging bolts 24 whose length can be adjusted are connected to a drive frame 23 having a cylindrical part 22 that can slide along the outer surface of the hanging cylinder 17 and move up and down, and the other end is connected to a crank arm 20.
pin connected to.

A T fitting 25 is connected to the cylindrical part 22, and the lifting frame 1
The arm 25a is connected to the piston rod of a hydraulically driven piston 26 fixed to the piston 6.

By applying hydraulic pressure to the piston 26, the hanging cylinder 17
The T-fitting 25 can move up and down by a stroke e within the elongated hole 27 provided in the .

As a result, the drive frame 23 is moved up and down by the stroke e, and the crank arm 20 is rotated by the hanging bolt 24, so that the unit drum 1 degree can be held or released.

Figure 8 shows how 1° unit drums are stacked in the hold.

For convenience of explanation, this drawing shows unit drums stacked with their 1° axes parallel to the ship's axis; however, in actual shipping, they are stacked perpendicular to the ship's axis.

The two unit drums are clamped and grasped by the crank arm 20 as described above, lifted up by the lifting rod 9, transported laterally to the position 8' or 8'' by the self-propelled conveying device 8, and then transferred to the slat conveyor 28 according to the present invention. It is placed on top of it as shown.

Conventionally, a dumping rail device consisting of a driving roller rail section and a pop-out free roller section as shown in Fig. 5 was proposed, but this method is designed to reliably capture and transfer unit drums while the ship is rolling at sea. We considered various transfer devices as necessary.

In this case, since the unit drum has a lid part C and a rib part d that extend outward from the main body diameter, it was confirmed that using these to prevent self-propulsion would produce a favorable effect. It was decided to use a slat chain conveyor using a pipe link belt in which a plurality of tubular members 29 bent in an arc shape into a curve approximating the outer periphery of the unit drum body are connected to chain links.

It has been confirmed that the use of the conventionally known rectangular plate-shaped body hinders smooth conveyance.

When the pipe link belt is used for two-way timing, two rows of conveyors are set as one set as shown in FIG.

. As shown in Fig. 9, this slat conveyor 2B is sufficient if its length is slightly longer than the height of the unit drum, 8901 m, and a so-called short conveyor can be used, and when loading unit drums, a pallet is used. The frame can be placed on the slat conveyor with the drum cans on it, grasped by a self-propelled transport device, and loaded into the hold.

By using this slat conveyor 28, the unit drums can be captured by the rib-like tubular members 29, and even if the ship is rolling, the unit drums will not slide into the ship's hold.

The unit drums placed on the slat conveyor 28 are transferred outward, and the discharge chute 3 is connected to the self-propelled frame 6.
2, the drum slides down the drum guide passage 33 of the discharge chute 32 due to gravity and is discharged overboard.

FIG. 11 shows a perspective view of this discharge chute 32, which is connected to the self-propelled frame 6 by a lug 34, and is at the position 32 when sailing.
It was thrown up and stored inside the ship.

The discharge chute 32 is connected to the rail 3 on the side of the ship together with the self-propelled frame 6.
5 on wheels 36.

It is preferable that the drum guide passage 33 has a spread radiation angle α, which is a spread angle between its axes, of approximately 4 degrees.

The discharge chute 32 can be lightweight and made of a thin steel plate.

However, it is preferable to use a slightly thicker steel plate for the drum guide passage where the drum slides.

The angle of inclination of the drum guide passage 33 of the discharge chute with respect to the horizontal is usually about 30 degrees.

When stacking unit drums, it is necessary to provide an appropriate gap f so that the arm 20a of the crank arm 20, which is the arm for grasping the drums of the grasping device 14, can be easily inserted into the gap between the drums.

When the width of the arm 20a is 60 mm, this f is approximately 100 m.
It is better to set it to m.

In order to fill this gap in an orderly manner and stack the drums, the center-to-center distance of the drums is 670m, which can also be used as a pallet.
n unit frames 37 are placed on the bottom plate of the hold.

By using this pedestal 37, the gaps f between the stacked unit drums in the second and higher stages can be similarly stacked neatly into approximately 100 piles.

By carrying out this invention, unit drums can be stacked in a ship hold in an orderly and easy manner, the crank arm can be easily inserted into the gap f between unit drums, and the unit drums can be grasped and released easily and quickly under control from the control room. The use of ribbed slat conveyors facilitates the discharge of drums during hull rolling, the use of discharge chutes directs the overboard discharge of unit drums, and the use of hydraulically driven cylinders facilitates the overboard discharge of unit drums. This system has various effects in terms of safety, release, and loading, such as the ability to grasp and release multiple unit drums at a time, and eliminating the need for band tightening of unit drums, which is likely to cause radiation exposure.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the conventional process of releasing unit drums using wire rigging, Figure 2 is a front view showing the procedure for hanging unit drums by one rope, and Figure 3 is a unit made by tightening four unit drums with a band. Fig. 4 is a plan view of the unit dumping can body in which three unit drums are tied together with a band; Fig. 5 is a cross-sectional view of the hull showing the dumping device of the unit dumping can body; Fig. 6
7 is a front view of a grasping device according to the present invention, FIG. 8 is a front view of a radioactive waste ocean dumping device according to the present invention, and FIG. 9 is a front view in partial section of a lifting device. is a side view of the slat conveyor according to the present invention, FIG. 10 is a sectional view taken along line A-A in FIG. 9, FIG. 11 is a perspective view of the discharge chute, and FIG. 12 is a parent view taken along line B-B in FIG. . 1o...Unit drum can, 8...Pushing conveyance device, 9...Lifting rod, 14...Grasping device, 16...Lifting frame , 20...
Crank arm, f...Gap, 23...Driving body, 28...Slat conveyor, 32...
...discharge chute, 37... mount.

Claims (1)

[Scope of Claims] 1. A device for dumping a plurality of unit drums stacked horizontally in a ship hold overboard using a self-propelled transport device, comprising: , a set of slat conveyors located at both ends of the ship's axial direction frame of the self-propelled conveyor, a discharge chute with a plurality of drum can guide passages, and a lower end of the lifting rod of the self-propelled conveyor. 1. A radioactive waste ocean dumping device comprising a grasping device capable of simultaneously grasping or simultaneously discharging a plurality of unit drums. 2. A radioactive waste ditch dumping device according to claim 1, characterized in that a plurality of crank arms are rotated by the operation of one drive cylinder to grasp or simultaneously discharge a plurality of unit drums. . 3. A device according to claim 1, characterized in that a plurality of drum can guide passages are directed outward from the ship, and discharge chutes are provided in a radial manner to enable drawing into the ship and jumping out of the ship. Radioactive waste ocean dumping device. 4. The radioactive waste ocean dumping device according to claim 3, further comprising a discharge shoe with a radial angle of approximately 4 degrees between the drum guide passages. 5. The number of unit drums to be grasped or discharged at the same time is 2.
2. The radioactive waste ocean dumping device according to claim 1, further comprising a separate grasping device. 6. Claim 1, characterized in that a mount is provided on the bottom plate of the hold, which allows the drums placed horizontally in parallel to each other with a gap of about 100 mm between their sides to enable stacking.
Radioactive waste ocean dumping equipment as described in Section 1. 7. The radioactive waste ocean dumping device according to claim 1, wherein the drum holder of the slat conveyor is formed of a plurality of arcuate curved pipes. 8. Claim 1, characterized in that the length of the parallel portion of the slat conveyor is approximately the length of the drum can.
Radioactive waste ocean dumping equipment as described in Section 1.