JPH0222720Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for introducing radioactive waste, and aims to improve the storage efficiency of the device by effectively distributing and introducing the materials into the storage.

Conventionally, in nuclear fuel reprocessing plants, radioactive solid waste (hull) is placed in a shaped metal drum (hull drum) 1, as shown in FIG. The radioactive waste is stored in the storage bin 3 and transported to the top of the input port 4 of the radioactive waste storage 3, from where it is suspended and thrown into the storage 3 for temporary storage. The storage 3 is a sealed cell covered with thick concrete, and a shielding trap 5 is installed in an input port 4 opened in the ceiling. The shielding trap 5 has a trap shielding door 6 that covers the input port 4 in an openable and closable manner, and when the transfer container 2 is placed thereon and the hull drum 1 is suspended in the storage 3, the trap shielding door 6 is opened. An opening/closing mechanism is provided to close the trap shielding door 6 when the transfer container 2 is not present.

However, the shielding trap 5 installed in the input port 4 has an opening/closing mechanism for the trap shielding door 6 as described above, and is configured so that a heavy transfer container 2 made of thick metal can be placed thereon. Therefore, it is inevitably large in size, and it is not possible to provide a large number of input ports 4 due to the restriction of installation space.
Generally, the storage 3 is provided with only one input port 4 for each cell. Therefore, in the past, the hull drums 1 were stored by suspending them from one input port 4 for a large storage 3, so the hull drums 1 were piled up in a mountain shape with the apex just below the input port 4. The number of pieces stored in the corners of the storage 3 far from the storage 3 is small, and the top of the hull drums 1 accumulated over the entire storage space of the storage 3 reaches the storage limit line 7 before the hull drums 1 are introduced.
There was a problem in that the storage efficiency with respect to the total volume of the storage 3 was low and it became impossible to store any more.

The present invention has been developed in view of the above-mentioned problems, and provides a loading device that allows radioactive waste to be loaded not only directly below the input port of a storage facility, but also dispersed around the outside of the storage facility. It is intended to. The configuration of the radioactive waste input device according to the present invention that achieves this purpose is such that it can be freely driven and rotated around a vertical axis while hanging inside the storage by a shielding trap installed above the input port of the storage for radioactive waste. A cylindrical input frame is supported by the input frame, and has a hollow space inside for the input material to pass through, the upper opening of which is covered with a trap shielding door so as to be openable and closable, and a cylindrical input frame is located below the inner cavity of the input frame. The tip is supported at the bottom of the loading frame and is loaded into the loading frame so that it can be driven and tilted freely in a range including an inclined position where the tip is inclined diagonally downward and a vertical position away from the bottom of the inner cavity of the loading frame. It is characterized by comprising an inclined slide that supports and guides the bottom of the input material.

An embodiment of the present invention will be described in detail below with reference to the drawings. Figure 2 is a cross-sectional view of a radioactive waste storage facility equipped with the loading device of the present invention, Figure 3 is a schematic configuration diagram of the loading device of the present invention, Figure 3a is its vertical cross-sectional view, and Figure 3b , c are main part cross-sectional views of a turning worm wheel part and an intermediate gear part, respectively. In the drawing, a cylindrical input frame 11 having a space inside through which the hull drum 1 can be input and pass through the input port 4 of the storage 3 is arranged to hang down inside the storage 3, and is installed above the input port 4. A charging frame 11 is supported on the shielding trap 5 via a bearing 12 so as to be rotatable around a vertical axis. A trap shielding door 6 of the shielding trap 5 is provided above the charging frame 11 to cover the upper opening thereof so as to be openable and closable. Additionally, a turning worm wheel 13 is provided on the upper outer periphery of the input frame 11.
At the same time, a turning worm wheel 13, which is pivotally supported on the shielding trap 5 side and rotationally driven by a drive source (not shown), is engaged with the turning worm wheel 13, and the loading frame is rotated by the rotational drive of the turning worm 14. 11 is rotated around a vertical axis. In addition, 5' in the figure is a shielding trap already installed in the storage 3.

On the other hand, a pair of supporting pieces 11a are formed in the lower opening of the charging frame 11 so as to protrude downward and are opposed to each other. The hinge shafts 17 are horizontally supported coaxially with each other, and an inclined slide 18 that can be positioned below the inner cavity of the input frame 11 is fixed to the hinge shafts 17. Inclined slide 18
is located below the inner cavity of the input frame 11 as shown in FIG. When it comes off from below, the support piece 1
1a, it can be tilted about a hinge shaft 177 to a vertical position, and a large number of sliding rollers 19 are provided on the top surface of the tilting slide 18 to support and guide the bottom of the hull drum 1 loaded into the loading frame 11. They are arranged in parallel in the longitudinal direction.

Also, corresponding to each gearbox 15, there is a loading frame 1.
A tilting drive shaft 21 is pivotally supported in the vertical direction along the side wall of 1 through bearings 20, while a tilting worm wheel 22 is fixed to the hinge shaft 17 in the gear box 15, and the tilting drive shaft 21 is Tilting worm 23 fixed to the lower end
is engaged with the tilting worm wheel 22. A pinion 24 is fixed to the upper end of the tilting drive shaft 21, and a bearing 2 is attached to the upper outer periphery of the input frame 11.
These pinions 24 are meshed with a ring-shaped intermediate gear 26 which is rotatably fitted loosely through the pinion 5.
Furthermore, a drive pinion 27 is meshed with the intermediate gear 26 and is pivotally supported on the shielding trap 5 side and rotationally driven by a drive source (not shown). Therefore, when the drive pinion 27 is rotationally driven, the intermediate gear 26 rotates, and the rotation of the intermediate gear 26 rotates the tilting drive shaft 21 via the pinion 24.
1 is transmitted to the hinge shaft 17 via the tilting worm 23 and the worm wheel 22, and causes the tilting slide 18 to tilt.

In such a configuration, in order to load the hull drum 1 into the storage 3, the trap shielding door 6 above the loading frame 11 is opened, and the hull drum 1 is placed inside the loading frame 11.
Insert. Here, as shown in FIG. 5, if the inclined slide table 18 is placed in the vertical position,
Huldrum 1 inserted within is placed in slot 1 as it is.
1 and is thrown directly under it. Further, if the tilting slide 18 is tilted by rotationally driving the drive pinion 27 and the tilting slide 18 is placed in a tilted position below the loading frame 11 as shown in FIG. The hull drum 1 falls onto the inclined slide 18, and then falls onto the inclined slide 18.
The object slides smoothly on the sliding roller 19 and is thrown forward with great force. This inclined slide 1
The landing point of the hull drum 1 thrown out by sliding the slider 8 can be controlled in distance by changing the inclination angle of the inclined slide 18, and furthermore, by rotating the turning worm 14, the charging frame 11 can be rotated. When moved, the inclined slide 18 rotates,
Thereby, the direction in which the hull drum 1 is thrown can also be controlled. Therefore, by using the loading device of the present invention, the hull drums 1 can be uniformly loaded into every corner of the storage 3 by being distributed not only directly below the loading port 4 but also around the outer periphery thereof. Fig. 6 is a computer simulation diagram showing the shape of deposits of input material in the storage.While Fig. 6a, which shows the conventional shape of deposits, is chevron-shaped, the shape of deposits using the injecting device of the present invention is In Figure 6b, which shows the shape of the deposit in this case, the shape is flattened, and this figure also confirms that the injecting device of the present invention disperses the input material uniformly and improves the storage efficiency. .

In this embodiment, in the tilting mechanism of the inclined slide 18, an intermediate gear 26 is rotatably fitted loosely into the input frame 11, and the inclined slide 1 is rotated through the intermediate gear 26.
8 is tilted, so the slot slot 11
The tilting slide 18 independently
It has the advantage that it can be tilted, and its drive mechanism can also be simplified.

On the other hand, the input device of the present invention is installed at the input port 4 of the storage 3.
If the inclined slide 18 is positioned vertically, the inclined slide 18 will not get in the way of attachment and detachment, and the inlet 4 of the existing storage 3
It can be installed in

As described above in detail with reference to one embodiment, according to the present invention, radioactive waste is not only injected directly under the input port of the storage facility, but also distributed around the outside of the storage facility to be uniformly distributed throughout the storage facility. This makes it possible to improve the storage efficiency of the storage. Further, by placing the inclined slide in a vertical position, the lateral dimension can be reduced, and it can be installed as is in an existing input slot.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional radioactive waste storage facility.
Figures 2 to 5 show an embodiment of the present invention, in which Figure 2 is a sectional view of a radioactive waste storage facility equipped with the loading device of the present invention, and Figure 3 is a schematic configuration diagram of the loading device of the present invention. , and Fig. 3a is a vertical cross-sectional view thereof;
Figures b and 3c are sectional views of the main parts of the turning worm wheel and intermediate gear, respectively, and Figures 4 and 5 are
The figures are diagrams explaining the use of the charging device of the present invention, in which Fig. 4a is a longitudinal sectional view when the inclined slide is in the inclined position, Fig. 4b is a plan view thereof, and Fig. 5
The figure is a longitudinal sectional view when the inclined slide is in the vertical position, and FIG. 6 is a computer simulation diagram showing the shape of deposits in the storage. In the drawings, 1 is a hull drum, 2 is a transfer container, 3 is a storage area, 4 is an input port, 5 is a shielding trap, 6 is a trap shielding door, 11 is an input frame, 13 is a worm wheel for rotation, 14 is a worm for rotation, 17 is a hinge shaft, 18 is a tilting slide, 19 is a sliding roller, 21 is a tilting drive shaft, 22 is a tilting worm wheel, 23 is a tilting worm, 24 is a pinion, 26 is an intermediate gear, and 27 is a driving pinion. It is.

Claims (1)

[Scope of utility model registration request] A shielding trap 5 installed above the input port 4 of the radioactive waste storage 3 is supported so as to be rotatable around a vertical axis while hanging inward of the storage 3, and has an air space inside through which the input material passes. A cylindrical loading frame 11 having an upper opening that can be opened and closed with a trap shielding door 6, and a slanted tip located below the inner cavity of the loading frame 11 and having a tip inclined diagonally downward. Supports the bottom part of the input material to be loaded into the input frame 11 supported at the lower part of the input frame 11 so as to be freely movable and tiltable in a range including the position and the vertical position away from the bottom of the inner cavity of the input frame 11. A radioactive waste dumping device characterized by comprising a guiding inclined slide 18.