JPH02298896A - Waste hopper for radioactive waste melting furnace - Google Patents

Abstract

PURPOSE:To prevent a breakage of a waste container and a dispersion of contained wastes by lowering a bucket far into a radioactive waste melting furnace and by throwing the wastes there into the furnace. CONSTITUTION:Wastes are thrown into a bucket 7 supported by a transfer cart 6, from a waste feeder hole 9 of a sealed hood 3. Then, after the bucket 7 is closed, the transfer part 6 returns to a place where the wastes are thrown, in and simultaneously an open/close door 10 is closed. After that, a sliding dumper 5 is opened by a cylinder 4 and a bucket elevator descends far below keeping the bucket 7 closed, to insert the bucket 7 into an inside of a waste container 2 of a radioactive waste melting furnace 1. Subsequently, a cylinder 22 for the bucket opening/closing is activated and a rod for the bucket 7 opening/closing is pushed down by a bucket rod stopper lever 27, to open a bottom lid 11 of the bucket 7 and to throw the wastes into the container 2. As a throwing-in work is done within a very short distance to the container 2 in such a manner, there exists no shock of falling down.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for introducing waste into a radioactive waste melting furnace, in which non-combustible miscellaneous solid waste can be safely and reliably introduced into a radioactive waste melting furnace. This relates to a charging device.

(Conventional technology) Melting and solidifying is one of the methods for disposing of non-combustible radioactive miscellaneous solid waste such as miscellaneous metals, inorganic materials such as insulation materials and concrete, and incineration ash of combustible waste generated from nuclear power plants, etc. There is a processing method. This treatment method involves heating a waste storage container made of conductive ceramics to 1300 to 1600'C by induction heating in a radioactive waste melting furnace to melt the waste and solidify it into glass.

In order to charge waste into such a radioactive waste melting furnace, an airtight hopper is provided above the furnace as shown in Japanese Patent Laid-Open No. 61-209399, and the waste is fed from the upper end of the airtight hopper. A typical charging device was such that the waste fell through a long and narrow tube at the bottom of the hopper into a waste storage container inside the furnace. However, in such a conventional charging device, the ceramic waste storage container may be damaged due to the impact when it falls, and the molten metal may scatter from the top of the waste storage container due to the impact when it falls. For this reason, in the past, it was necessary to cut and crush the waste into small pieces to ensure safety at the time of input, which posed the problem of increasing the burden of pretreatment.

In addition, a device has been developed that melts waste while it is still in a container such as a drum can, but this has the drawback of increasing the amount of waste by the amount of the container, which increases costs.

(Intelligence R to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, allows waste to be quietly introduced into the waste storage container in the furnace, and eliminates pre-treatment. This was completed in order to provide a waste input device for a radioactive waste melting furnace that can reduce the load and reliably prevent leakage of radioactivity to the outside.

(Means for solving the problem) The above problem is solved by providing a sealed hood above the radioactive waste melting furnace, and inserting a bucket with an openable bottom lid into the radioactive waste melting furnace from inside the sealed hood. The problem can be solved by a device for introducing waste into a radioactive waste melting furnace, which is characterized in that a bucket lifting device for lowering the bucket to .

(Examples) The present invention will be explained in more detail below using illustrated examples.

FIG. 1 is an overall view of an embodiment of the present invention, in which (1) there is a waste storage container (2) made of conductive ceramics inside.
(3) is a closed hood installed above the radioactive waste melting furnace. The upper part of the radioactive waste melting furnace (1) is connected to a closed hood (3), and a slide damper (5) that is opened and closed by a cylinder (4) is provided at the connection between the two.

(6) is a transfer trolley movably provided inside the airtight hood (3), and a bucket (7), which will be described later, is attached to the tip of the transport trolley.
) is provided with a protruding support (8). (9) is the waste input port provided on the top surface of the closed hood (3), and as shown by the imaginary line, the transfer trolley (6) is located at the waste input port (9).
At , the waste can be received in the bucket (7) and advanced to the position shown in solid lines. Note that (IllD is an opening/closing door installed in the middle of the airtight hood (3), and by closing this opening/closing door 00 before the waste input port (9) is opened, radioactive materials can be released to the outside. Prevents leakage.

As shown in Figure 2, the bucket (7) is attached to the bottom of the cylindrical body. The bottom lid (11) is divided into 12 parts and pivotally connected by a hinge 021, and these bottom lids θ0 are connected to the lower end of an opening/closing rod 031 on the side surface of the main body via an opening/closing link (b). Therefore, when the opening/closing rod 01 is pressed downward, the bottom cover 01) opens as shown in the imaginary line and the waste inside falls out, but the opening/closing rod 01) is normally pushed upward by the spring 051. Therefore, even when waste is stored, the bottom cover 00 remains closed unless external force is applied. Note that Oe is a claw for the transfer trolley protruding from the outer surface of the bucket (7), and 0'?
) is a claw for raising and lowering the bucket protruding from the inner surface of the upper part of the bucket (7).

The bucket (7) as described above is placed in the radioactive waste melting furnace (1
), a bucket lifting device 0 mark is provided above the closed hood (3). As shown in FIGS. 3 and 4, this bucket lifting device Q8) is equipped with a cylinder 121 that moves up and down while sliding on a gland packing 09 provided on the upper protrusion of the airtight hood (3). A bucket chuck cylinder (21) and a bucket opening/closing cylinder (22) are provided inside and above the cylinder 01. At the lower end of the piston rod (23) of the cylinder (21), as shown in FIG. is attached, and when the piston rod (23) moves upward, the lower end of the bucket chuck claw (24) closes as shown by the solid line, and when the piston rod (23) moves downward, the lower end of the bucket chuck claw (24) closes as shown by the solid line.
4) has a structure in which the lower end opens and engages with the claw 0η on the inner surface of the bucket (7), allowing the bucket (7) to be chucked. The bucket opening/closing cylinder (22) operates multiple rods (26) via a bracket, and the bucket rod holder (27) at the lower end of these rods (26)
move up and down. This bucket rod holder (27) contacts the upper end of the opening/closing rod 031 of the bucket (7) when the bucket (7) is chucked to the bottom of the cylinder (to),
When the bucket rod holder (27) is pushed down by the cylinder (21), the bottom cover (10) of the bucket rod (7) can be opened. ) A bellows-shaped hood (28) is attached to surround the cylinder (to), so that even if radioactive materials leak from the gap in the gland packing (09),
It is designed to prevent it from being dispersed into the atmosphere.

(Function) The waste input device of the present invention configured as described above first transfers waste from the waste input port (9) of the closed hood (3) into the bucket (7) supported by the transfer trolley (6). 9 Next, the transfer trolley (6) moves to the position shown by the solid line in Figure 1, and the cylinder (toward) on the side of the bucket lifting device descends from above, and the bucket chunk claw (24) moves to the position shown by the solid line in Figure 1.
7) engages with the claw 07) to chuck the bucket (7). After the bucket (7) is chucked in this way, the transfer cart (6) returns to the waste input position, and at the same time, the opening/closing door Ql closes and the slide damper (5) opens by the cylinder (4). , bucket lifting device 08
) further descends while chucking the bucket (7) and inserts the bucket (7) into the waste storage container (2) of the radioactive waste melting furnace (1). Please note that waste storage containers (
If there is molten material inside (2), the bucket stop position is directly above the waste storage container (2).

Next, operate the bucket opening/closing cylinder (22), push down the opening/closing rod θω of the bucket (7) with the bucket rond holder (27), and open the conical two-part bottom cover 01) of the bucket (7). , throw the waste stored inside into the waste storage container (2). In this way, the waste is placed in close proximity to the waste storage container (2), so there is no impact when it falls, and there is no risk of the waste storage container (2) cracking or the molten material inside scattering. There isn't. Further, even when the two-part conical bottom cover 01) of the embodiment is opened, the outer diameter does not change and there is no interference with the reactor internal structure. Thereafter, when the pressure on the opening/closing rod Q31 is released by the cylinder (22), the bottom cover θ0 is closed by the force of the spring 0ω, and the bucket (7) is pulled up into the closed hood (3).

As described above, while the slide damper (5) is open, the opening/closing door side of the airtight hood (3) is closed, so that the gas inside the furnace does not leak to the outside. Also, the bucket lifting device 081 is Grand Packkin 0! In addition to being sealed by D, the outside is surrounded by a hood (28), so radioactive dust attached to the outer surface of the cylinder (to) will not leak outside.In this way, radioactive gas and The dust is retained inside the airtight hood (3) and is sucked into the wandering gas system and treated.
Although the cylinder is not directly exposed to the high heat of the furnace, it can be operated more reliably by cooling it by flowing cooling air inside.

(Effects of the Invention) As explained above, the present invention lowers the bucket into the inside of the radioactive waste melting furnace and throws in the waste, so the impact of the falling waste damages the waste storage container. There is no risk of breakage or the scattering of the molten material inside, and the waste only needs to be cut to the size that fits into the bucket, reducing the burden of pretreatment as there is no need to cut it into smaller pieces like in the past. can. Moreover, since the bucket is handled inside the closed hood by a bucket lifting device sealed from the outside air, leakage of radioactive substances such as radioactive furnace gas and dust to the outside is reliably prevented.

Therefore, the present invention can greatly contribute to the development of industry as a waste input device for a radioactive waste melting furnace that eliminates the problems of the conventional methods.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a side view of the bucket, Fig. 3 is a partially cutaway front view of the bucket lifting device, and Fig. 4 shows the relationship between the bucket lifting device and the bucket. FIG. (1): Radioactive waste melting furnace, (3): Closed hood, (
7): Bucket, 0υ: Bottom cover, QIID: Bucket lifting device.

Claims (1)

[Claims] A sealed hood (3) is provided above the radioactive waste melting furnace (1), and a bucket (7) with an openable bottom lid (11) is inserted into the radioactive waste melting furnace ( 1) A bucket lifting device (18) for lowering the waste to the inside of the radioactive waste melting furnace is provided above the airtight hood (3) in a state sealed from the outside air. Insertion device.