JP2635419B2 - Drying equipment for radioactive solid waste - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a drying apparatus for radioactive solid waste (hereinafter referred to as waste).

[Conventional technology]

As is well known, radioactive solid materials and radioactive contaminants such as fuel control rods, fuel cladding tubes, ion exchange resins and the like of cut and used uranium fuel are stored together with water in containers made of stainless steel and the like. Stored in a storage pool or stored in a storage room.

[Problems to be solved by the invention]

From the viewpoint of the storage space, it is preferable that the waste storage method be subjected to a treatment such as volume reduction stabilization in order to effectively utilize the storage space and stabilize harmful substances.

As described above, means for stabilizing volume reduction include, for example, a melting treatment, a compression treatment, and an incineration treatment.

By the way, if the waste is directly treated for volume reduction and stabilization, there is a problem that steam explosion occurs during the treatment, solidification becomes impossible due to an increase in internal pressure due to generation of steam and gas, and combustion is difficult. Water must be removed before processing.

However, in practice, no consideration is given to post-treatment and disposal, and no water removal treatment is performed.

However, as waste storage increases, it is expected that waste storage will soon become an issue.

Accordingly, an object of the present invention is to provide a waste drying apparatus capable of easily and safely removing water content.

[Means for solving the problem]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and accordingly, a configuration of a waste drying apparatus according to the present invention includes a blowing port through which a heated inert gas is blown, and A mouthpiece having a seat seat fitted externally through the body is protruded from the bottom, a degassing device for sucking gas inside is attached, and a sealable drying container having a heater inside is provided. The object to be processed is housed therein, and is housed in the drying vessel in a state surrounded by the heater, and is provided at the bottom inside a cylindrical filter having a canopy provided at the bottom. A housing container provided with an opening / closing valve that is pressed by an inlet hole of the mouthpiece through an elastic body to close the valve, and that is opened by being pushed by the mouthpiece inserted from the inlet hole. Features.

[Action]

According to the present invention, when the object to be processed is accommodated in the container and moved, the water flowing out of the object passes through the filter, but the piercing hole of the mouthpiece at the bottom of the container is pressed by the resilient material. Since the valve is closed by the open / close valve, the water passing through the filter does not flow out of the storage container.
Then, when the storage container is put in the drying container, the drying container is sealed, and the mouthpiece is pushed into the piercing hole to push the open / close valve, thereby opening the open / close valve. The seat seat fitted outside is pressed against the bottom of the storage container by the resilient body, and the outflow of water from the storage container is prevented.

Next, degassing in the drying container is performed by operating the degassing device, and heated inert gas is blown into the housing container from the inlet of the fitting, and power is supplied to the heater. .

〔Example〕

An embodiment of the present invention will be described with reference to FIG.
This will be described below with reference to the drawings, FIG. 2 illustrating the configuration of the storage container for the object to be processed, and FIG. 3 illustrating the detailed configuration of the part III in FIG.

That is, reference numeral (1) shown in FIG. 1 denotes an openable and closable canopy (1a) having a sealing function when the lid is closed, a heater (1b) along an inner wall provided therein, and a housing (to be described later) at the bottom. This is a drying container provided with a support (1d) on which the container (5) is placed, and a drain pipe (1c) provided outside near the bottom. On the other hand, a dehumidifier (2a), a dust filter (2b), and a vacuum pump (2c) are connected to the outside of the upper part of the drying container (1) via piping from the container (1) side. In addition to providing a degassing device (2), a drying container (1)
In the center of the bottom, a plurality of inert gas blowing ports (4a) are drilled at equal intervals around the outer periphery near the tip, and the seat (4b) is fitted over the coil spring (4c). The metal fitting (4) thus formed was protruded, and the lower end of the metal fitting (4) projecting downward from the drying container (1) was communicated with the gas introduction part (3).

The gas inlet (3) is provided with a gas heater (3a) and an inert gas supply source (3b) such as a gas cylinder from the drying vessel (1).
Are connected via a pipe.

Further, the container (5) containing the waste (w), which is the object to be subjected to the water removal treatment, is placed on the support (1d).

Details of the storage container (5) are as shown in FIG.
An entrance (5d) provided at the center of the bottom and into which the tip of the base (4) enters when placed on the support (1d).
Cover the cylindrical filter (5
a) was installed. In addition, as a material of the cylindrical portion of such a filter (5a), for example, a sintered metal that becomes a porous material may be used.

Inside the cylindrical filter (5a), as shown in FIG. 3, before mounting on the support table (1d), the entrance (5d) is closed by the pressing force of the coil spring (5c), An opening / closing valve (5b) which was pushed and opened at the tip of the fitting (4) at the time of mounting was provided. Therefore, by the function of the filter (5a), a sealing failure caused by the entry of dust or the like between the valve seat of the inlet (5d) and the on-off valve (5b) is prevented.

Further, when the storage container (5) is placed on the support (1d), the seat (4b) externally fitted to the mouthpiece (4) has an elastic force of the coil spring (4c). The water is prevented from flowing out by being pressed against the lower surface of the container (5) by the action.

The use of the drying apparatus having the above-described configuration will be described below. When the waste (w) is put into the storage container (5) and moved, the water coming out of the waste (w) is transferred to the cylindrical filter (5a). ), But the inlet (5d) at the bottom of the storage container (5) is closed by the on-off valve (5b), so that water passing through the filter (5a) flows out of the storage container (5). And external radiation contamination is prevented. Then, when the storage container (5) is stored in the drying container (1),
While the canopy (1a) of the drying container (1) is closed and sealed, the on-off valve (5b) is pushed by the tip of the fitting (4) to open this valve (5b), while the fitting ( The seat (4b) fitted to the outside of the container (4) is pressed against the lower surface of the container (5) by the coil spring (4c), and contaminated water flows out of the container (5) into the drying container (1). Is prevented. In such a storage operation of the storage container (5) in the drying container (1), the contaminated water flowing into the drying container (1) is discharged to the outside from the drain pipe (1c).

Next, drying of the waste (w) stored in the storage container (5) is performed as follows.

First, the inside of the drying vessel (1) is degassed by operating the vacuum pump (2c) of the degassing device (2). Then, for example, even if the cut portion of the fuel rod which becomes a zirconium alloy is deformed flat, and even if it is a fine powder and the flow of the dry gas is poor, the evaporation of water is accelerated, so that the internal drying Can be easily performed.

When the heated inert gas is supplied from the inert gas supply source (3b) through the gas heater (3a), the inert gas is supplied from the inlet (4a) of the fitting (4) to the container (5). And the waste (w) is dried into the inside, so that it is possible to easily prevent the ignition and explosion of even highly active substances such as cutting residues such as fuel rods that become zirconium alloys. it can.

Further, the waste (w) is also heated and dried by supplying power to the heater (1b).

Thus, the waste (w) can be more effectively and safely dried by the synergistic effect of the three drying means.

The above embodiments are merely specific examples of the present invention, and therefore, the scope of the technical idea of the present invention is not limited by the embodiments.

〔The invention's effect〕

According to the present invention, when the object to be processed is moved in the container, the water flowing out of the object passes through the filter, but the inlet at the bottom of the container is closed by the on-off valve. The water that has passed through the filter does not flow out of the container.

Next, when the storage container is placed in the drying container, the drying container is sealed, and the opening / closing valve is pushed by the fitting to open the valve, while the seat seat fitted to the fitting is elastically pressed. Since the water is pressed against the bottom surface of the storage container and water is prevented from flowing out of the storage container, the dissipation of the contaminants is prevented.

Then, when the degassing device is operated, degassing in the drying container is performed, so that evaporation of water is promoted even in a situation of poor air permeability, and drying is performed even with heated inert gas. Even if the object is easily ignited or exploded, there is no danger of ignition, explosion, etc., and a safe drying process can be performed.

Further, since the object to be processed is also heated by the heater, the object to be processed can be dried more effectively by the synergistic effect of the respective drying means, and the effect is extremely large.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating the overall configuration of a drying apparatus according to an embodiment of the present invention, FIG. 2 is a diagram illustrating the configuration of a storage container for an object to be processed according to an embodiment of the present invention, and FIG. FIG. 3 is an explanatory diagram of a detailed configuration of part III. (1) ... drying container, (1b) ... heater, (2) ... degassing device, (2c) ... vacuum pump, (3) ... introduction part of inert gas, (4) ... mouth Metal fittings, (4b) ... seat seat,
(5) ... accommodation container, (5a) ... cylindrical filter, (5
b)… on-off valve, (w)… waste.

Claims (1)

(57) [Claims] 1. A mouthpiece having a blow-in port through which a heated inert gas is blown and having a seat seat fitted through a resilient body is protruded from a bottom portion to suck the gas inside. A degassing device is attached, and a sealable drying container in which a heater is provided, and an object to be processed is housed therein, and is housed in the drying container in a state surrounded by the heater. The inside of a cylindrical filter having a canopy provided at the bottom, the opening of the fitting provided at the bottom is pressed through an elastic body to close the valve, and the opening protrudes from the entering hole. A drying apparatus for drying radioactive solid waste, comprising: a storage container having an open / close valve that is opened by being pressed by a metal fitting.