JPH09202572A - Lifting device to input radioactive waste in disposing area built in deep bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relieve a burden exerted on a drive system and a deceleration system. SOLUTION: In a lifting device to input radioactive waste 1, such as glass cured substance, to a radioactive waste disposing ground built in an underground deep bed, a balancing weight 6 the weight of which is regulatable by feeding and discharging water in and from the interior is arranged at the end part opposite side to the end part of the car 5 side of a rope 4 suspending the radioactive waste 1. Since water is poured and drained according to a weight placed on the car 5, the car 5 is constantly well balanced with the weight 6 and a burden applied on the drive system and the deceleration system of the rope 4 is relieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for loading radioactive waste into a radioactive waste disposal site formed in a deep layer several hundred meters underground.

[0002]

2. Description of the Related Art High-level radioactive waste generated from nuclear facilities is made into a vitrified solid that is easy to handle and
After being stored on the ground for 50 years from the year, it is considered that it will be disposed of at a disposal site provided in a deep stratum several hundred meters underground.

As a method for carrying radioactive waste to this disposal site, for example, a radioactive waste receiving facility constructed above the ground and an underground disposal site are connected by a vertical shaft, and the inside of the shaft is connected. A method has been proposed in which radioactive waste is carried in from the above-ground portion to the disposal site by lifting means such as an elevator that vertically moves up and down.

[0004]

However, this radioactive waste has a loading weight of 10 tons and, as described above, a carry-in height of several hundreds of meters. It is expected that the load on the drive system and the reduction system will be extremely large.

Therefore, an object of the present invention is to provide a hoisting device for carrying in radioactive waste to a disposal site constructed in a deep underground, which can reduce the load on the drive system and the reduction system.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the first invention is to carry down radioactive waste such as vitrified waste through a vertical shaft to a radioactive waste disposal site constructed in a deep underground layer. In the lifting device for, a vertical shaft, a rope car provided above the vertical shaft, and a cage for mounting the radioactive waste, which is attached to one end of a rope suspended on the rope car. , A balance weight attached to the other end of the rope and filled with water of a weight that balances the radioactive waste placed on the cage, and a water injection unit that is provided at the bottom of the shaft and injects water into the balance weight. The lifting device is provided on the ground and has a drainage unit for discharging water from the above-mentioned counterweight that has been raised to the ground after being carried in.

The second invention is a lifting device in which the above-mentioned drainage unit on the ground and the water injection unit at the lower part of the shaft are connected via a downcomer pipe.

Since the present invention is constructed as described above, when the radioactive waste is placed on the cage on the ground side, the radioactive waste is placed on the cage by injecting water from the water injection unit into the counterweight at the bottom of the shaft. The load is reduced by balancing it with the object and rotating the rope in this balanced state to lower and carry in the radioactive waste through the shaft. Further, when the radioactive waste that has dropped to the bottom of the shaft is unloaded from the cage, water can be discharged from the counterweight located on the ground to balance the cage and the counterweight, and the cage can be raised to the ground again.

[0009]

1 is a schematic view showing a preferred embodiment of a lifting device according to the present invention.

As shown in FIG. 1, a shaft 2 for transporting through the radioactive waste 1 is a radioactive waste disposal site constructed several hundred meters below the radioactive waste receiving facility 30 constructed on the ground side 2a. It is formed by excavating the ground vertically to the vicinity of 40. A horizontal shaft 2c for passing the radioactive waste 1 is formed between the lower part of the shaft 2b and the disposal site 40 for disposing the radioactive waste 1, and although not shown, transfer for transferring the radioactive waste 1 Means are provided. A plurality of disposal sites 40 are provided so as to branch downward from the horizontal shaft 2c so as to be formed for each radioactive waste 1.

A rope wheel 3 is rotatably supported on a support frame 31 which is bridged over the opening of the vertical shaft 2. Further, an electric motor 8 as a drive system is connected to the rotary shaft of the rope vehicle 3, and a worm brake as a reduction system (not shown) is connected to the rotary shaft of the electric motor 8 although not shown.

A rope 4 is wound around the rope wheel 3.
As the rope 4, a wire rope having a strength sufficient to withstand a tension due to a weight of 20 tons is used, and a rope having a length from the lower portion 2b of the vertical shaft to the rope wheel 3 is used. A cage 5 is attached to one end of the rope 4, and a counterweight 6 is attached to the other end. The rope 4 is stretched over the rope car 3, and when one is located on the ground side 2a, the other is located in the lower shaft 2b.

The cage 5 attached to one end of the rope 4 includes a placing table 9 on which the radioactive waste 1 is placed, and a frame 10 for horizontally supporting the placing table 9 and connecting it to the rope 4. It is mainly composed of.

On the other hand, the balance weight 6 attached to the other end of the rope 4 is a container 11 for injecting water inside.
Although not shown, it is composed of an inlet provided in the upper part of the container 11 for injecting water and an outlet provided in the lower part of the container 11 for discharging water. The size of the container 11 is the radioactive waste 1 placed in the cage 5.
It is formed to have an internal volume capable of injecting a weight of water commensurate with the weight of. The inlet is composed of a through hole penetrating above the side wall of the container 11 and a check valve that opens by connecting the hoses of the pumps 16 and 18 described later. The drainage port is composed of a through hole that penetrates below the side wall of the container 11 and a check valve.

The balance weight water supply / drainage means 7 includes a drainage unit 17a provided on the ground side, a water injection unit 17b provided at a lower portion of the vertical shaft 2, and these units 17a,
It is composed of a downcomer pipe 15 connecting between 17b, and each of the units 17a and 17b is mainly composed of a water tank and pumps 16 and 18.

Next, the operation method of the present embodiment will be described with reference to FIG.

As shown in FIG. 2A, the rope wheel 3 is rotationally driven to arrange the cage 5 on the ground side 2a, and the rope 4 is fixed by a worm brake (not shown). FIG.
As shown in (b), water is injected into the container 11 in an amount sufficient to balance the previously measured radioactive waste 1 and the cage 5 with the counterweight 6. As shown in FIG. 2C, after placing the radioactive waste 1 on the mounting table 9, the rope car 3 is rotated in the direction of the arrow to move the radioactive waste 1 to the lower part of the shaft 2.
Lower to b. As shown in FIG. 2D, the cage 5
As the vehicle approaches the lower shaft 2b, the descending speed of the cage 5 is gradually reduced by a warm brake, and after the cage 5 has landed on the lower shaft 2b, the rotation of the rope wheel 3 is stopped. As shown in FIG. 2E, the water in the balance weight 6 is discharged. As shown in FIG. 2 (f), after the radioactive waste 1 is carried out from the mounting table 9, the rope car 3 is rotated in the arrow direction to raise the cage 5 to the ground side 2 a.

By repeating the operations shown in FIGS. 2 (a) to 2 (f), the radioactive waste 1 can be carried into the disposal site many times.

Next, the operation of the lifting device of this embodiment will be described.

When the radioactive waste 1 is placed on the mounting table 9, the weight of water that balances with the radioactive waste 1 is injected from the water injection unit 17b into the counterweight 6 at the lower part 2b of the shaft, and the cage 5 and the counterweight 6 are connected. Balance. Therefore, even if the radioactive waste 1 is placed in the cage 5, the electric motor 8
Not only that, the balance weight 6 also supports the radioactive waste 1 and the cage 5 via the rope car 3, so that the electric motor 8 is not burdened with a great load.

When the radioactive waste 1 is transferred to the lower shaft 2b by rotating the rope car 3, the rope car 3 is rotated and the radioactive waste 1 is lowered. Counterweight 6 through 3
Also supports the radioactive waste 1 and the cage 5, and lowers the shaft 2b.
When decelerating the cage 5 in the vicinity, the worm brake decelerates the cage 5 while the counterweight 6 supports the radioactive waste 1 and the cage 5 via the rope car 3. Therefore, no heavy load is applied to the electric motor 8 and the worm brake.

Further, when carrying out the radioactive waste 1 transferred to the lower part 2b of the shaft from the inside of the cage 5, the ground side 2
From the counterweight 6 located at b to the drainage unit 17a
The water is discharged by and the cage 5 and the counterweight 6 are in balance. When the rope wheel 3 is rotated in this state, a large load is not applied to the electric motor 8 and the worm brake. The water discharged into the drainage unit 17a is carried to the water injection unit 17b through the downcomer pipe 15. Therefore, the water injected into the balance weight 6 circulates via the balance weight 6, the drainage unit 17a, the downcomer pipe 15, and the water injection unit 17b.

In the present embodiment, the cage 5 is attached to one end of the rope 4 and the balance weight 6 is attached to the other end thereof. However, as shown in FIG. 3, the cage 5 and the balance weight 6 are provided. Side-by-side cage 21 with counterweight
May be attached to both ends of the rope 4, respectively.

Further, in the operating method of the present embodiment, the amount of water to be injected into the balance weight 6 is determined by the weight of the radioactive waste 1 measured in advance. The amount of water to be injected may be determined by gradually injecting water into the counterweight 6 while fixing the cage 5 of FIG. 6 with a worm brake, and stopping the water injection when the load applied to the worm brake disappears.

[0025]

In summary, according to the present invention, even if a heavy radioactive waste is carried into a radioactive waste disposal site planned to be built several hundred meters underground, the burden on the drive system and speed reduction system of the lifting device is increased. Can be reduced. Therefore, the drive system and the reduction gear system do not require a large capacity, so that the drive system and the reduction gear system can be downsized.

[Brief description of drawings]

FIG. 1 is a schematic view showing a preferred embodiment of a lifting device of the present invention.

FIG. 2 is a step diagram showing a method for operating a lifting device according to the present invention.

FIG. 3 is a schematic view showing a cage with a counterweight.

[Explanation of symbols] 2 shafts 3 rope cars 4 ropes 5 cages 6 balance weights 15 downcomers 16 pumps

Claims (2)

[Claims] 1. A lifting device for lowering and carrying radioactive waste such as vitrified waste through a vertical shaft into a radioactive waste disposal site constructed in a deep underground layer, which is provided above the vertical shaft and the vertical shaft. A rope car, a cage mounted on one end of the rope suspended on the rope car, for mounting the radioactive waste, and a radio carrier mounted on the other end of the rope for mounting the radioactive waste on the cage. A counterweight that is filled with a weight of water that balances with the waste, a water injection unit that is installed at the bottom of the shaft to inject water into the counterweight, and a counterweight that is installed on the ground and rises to the ground after loading. A lifting device for loading radioactive waste into a disposal site constructed in a deep underground, comprising a drainage unit for discharging wastewater. 2. The lifting for carrying radioactive waste to a disposal site constructed in a deep underground according to claim 1, wherein the above-mentioned drainage unit and the water injection unit below the shaft are connected through a downcomer pipe. apparatus.