JPH09189798A - Radioactive waste liquid treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reconcentrate a waste liquid with a concentrator by dechlorinating the concentrated waste liquid produced in a nuclear power plant to reduce the yield of the concentrated waste liquid and operate treatment facilities efficiently. SOLUTION: A waste liquid tank 1 is connected to a concentrator 3, which is connected to a concentrated waste liquid tank 6. It is connected to a dechlorinating device 10, whose downstream side is connected to the upstream side of the concentrator 3. The waste liquid collected in the waste liquid collecting tank 1 is transferred by way of a waste liquid transfer line 2 to the concentrator 3 to be concentrated. If the concentration of the solid content or sodium sulfate in the concentrated waste liquid which is concentrated in the concentrator 3 and is discharged to the concentrated waste liquid tank 6 does not reach a prescribed value, the concentrated waste liquid in the concentrated waste liquid tank 6 is transferred to the dechlorinating device 10 to remove chlorine. The dechlorinated concentrated waste liquid is transferred from a concentrated waste liquid return line 11 through the waste liquid line 2 to the concentrator 3, where it is reconcentrated. If the concentration of the solid content or sodium sulfate reaches the prescribed value, the waste liquid is transferred to the concentrated waste liquid tank 6 and is treated in a solidifying device 8 to be solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive liquid waste treatment apparatus for removing chlorine in a radioactive liquid waste generated in a nuclear power plant or the like and efficiently treating the liquid waste.

[0002]

2. Description of the Related Art A nuclear power plant is equipped with a radioactive waste treatment facility. With this facility, radioactive waste liquid generated in the power plant is appropriately treated according to its properties to reduce waste. There is.

An example of a conventional radioactive liquid waste treatment apparatus will be described with reference to FIG. In FIG. 4, the radioactive liquid waste generated in the nuclear power plant is collected in the liquid waste collection tank 1, and the collected liquid waste flows through the liquid waste transfer line 2 and is supplied to the concentrator 3. The waste liquid is concentrated and distilled in the concentrator 3, and the distilled water 4 is reused in the power plant after desalting, or after confirming that the radioactivity concentration is sufficiently low, it is released to the ocean outside the nuclear power plant. It

On the other hand, in order to ensure the soundness of the concentrating device 3, the concentrated concentrated waste liquid has a solid content concentration in the concentrating device 3,
When the chlorine concentration or the sodium sulfate concentration reaches a predetermined value, the concentrated waste liquid tank 6 is passed through the concentrated waste liquid discharge line 5.
After being stored for a certain period of time, the concentrated waste liquid is transferred from the concentrated waste liquid transfer line 7 to a solidifying device 8 where it is mixed with a solidifying material such as cement or plastic and solidified in a drum can. An example of a predetermined value for discharging the concentrated waste liquid in the concentrating device 3 is shown below.

[0005]

[Table 1]

[0006]

In the conventional radioactive liquid waste treatment device, the concentrated liquid waste concentrated in the concentrating device 3 is discharged to the concentrated liquid waste tank 6 when its concentration reaches a predetermined value. Most of the predetermined values are based on the numerical value of chlorine concentration. Therefore, the waste liquid in the concentrated waste liquid tank 6 is in a state where the solid content concentration and the sodium sulfate concentration are lower than the actual predetermined values. Therefore, there is a problem that the storage efficiency of the concentrated waste liquid stored in the concentrated waste liquid tank 6 is low and the operating frequency of the solidification device 8 increases.

When the storage amount in the concentrated waste tank 6 reaches a predetermined amount, the concentrated waste liquid is transferred from the concentrated waste liquid transfer line 7 to the solidification device 8 and mixed with the cement or plastic solidifying material to be solidified in the drum can. Since the solid content concentration and the sodium sulfate concentration of the waste liquid are light, there is a problem that the volume reduction is not sufficient and the number of drums generated increases.

The present invention has been made to solve the above problems, and its purpose is to efficiently remove chlorine in radioactive waste liquid generated in a nuclear power plant or the like to make a waste liquid that can be concentrated again. An object of the present invention is to provide a radioactive liquid waste treatment device capable of treating and storing liquid waste.

[0009]

The present invention relates to a waste liquid collection tank for collecting radioactive waste liquid generated in a nuclear power plant, a concentrating device for concentrating the waste liquid in the collection tank, and a concentrated waste liquid tank for storing the concentrated waste liquid. And a chlorine removing device for removing chlorine in the concentrated waste liquid in the concentrated waste liquid tank, and a concentrated waste liquid returning line for returning the concentrated waste liquid after chlorine removal to the concentrating device.

The present invention also relates to a waste liquid collecting tank for collecting radioactive waste liquid generated in a nuclear power plant, a concentrating device for concentrating the waste liquid in the collecting tank, and a concentrating device for concentrating the waste liquid in the waste liquid collecting tank. It is characterized by comprising a chlorine removing device for removing chlorine in the waste liquid, and a return line for returning the waste liquid after the chlorine removal to the waste liquid collecting tank.

Further, according to the present invention, a waste liquid collecting tank for collecting radioactive waste liquid generated in a nuclear power plant, a concentrating device for concentrating the waste liquid in the collecting tank, and chlorine in the concentrated waste liquid in the concentrating device are removed. It is characterized by comprising a chlorine removing device and a concentrated waste liquid returning line for returning the concentrated waste liquid after chlorine removal to the concentrating device.

According to the apparatus of the present invention, the chlorine component in the waste liquid concentrated by the concentrating device is removed so that the concentration process can be performed again. Further, by removing the chlorine component in the waste liquid collected in the waste liquid collection tank, it becomes possible to increase the degree of concentration in the concentrator. Therefore, the amount of concentrated waste liquid generated as waste can be reduced, and the equipment can be operated efficiently.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a radioactive liquid waste treatment apparatus according to the present invention will be described with reference to FIG. In FIG. 1, the same parts as those in FIG. 4 are denoted by the same reference numerals. In FIG. 1, the waste liquid collection tank 1 is a waste liquid transfer line 2
It is connected to the concentrating device 3 via. The concentrating device 3 is connected to a concentrated waste liquid tank 6 via a concentrated waste liquid discharge line 5,
It is connected to the solidification device 8 via the concentrated waste liquid transfer line 7.

On the other hand, a concentrated waste liquid transfer line 7 is branched and connected to a concentrated waste liquid branch line 9, which is connected to a chlorine removing device 10. A concentrated waste liquid return line 11 is connected to the chlorine removal device 10, and is connected to a waste liquid transfer line 2 that connects the waste liquid collection tank 1 and the concentration device 3. The chlorine removing device 10 removes chlorine by a method such as an electrolysis method, an electrodialysis method, or an adsorption method.

Therefore, in the first embodiment, the waste liquid collected in the waste liquid collection tank 1 is flown from the waste liquid transfer line 2 and transferred to the concentrating device 3 to be concentrated. Concentrator 3
The distilled water 4 evaporated in (1) is separated, and the concentrated concentrated waste liquid is discharged to the concentrated waste liquid tank 6 through the concentrated waste liquid discharge line 5 according to the predetermined value.

When the solid content concentration or the sodium sulfate concentration of the discharged concentrated waste liquid has not reached the predetermined value, the concentrated waste liquid in the concentrated waste liquid tank 6 is transferred to the chlorine removing device 10 through the concentrated waste liquid branch line 9. Remove chlorine. The concentrated waste liquid after chlorine removal is concentrated again in the concentrating device 3 via the concentrated waste liquid returning line 11, and when the solid content concentration or the sodium sulfate concentration reaches a predetermined value, it is transferred to the concentrated waste liquid tank 6 and the solidifying device 8 is used. Solidified.

In this case, the concentrated waste liquid after chlorine removal by the chlorine removal device 10 is once returned to the concentrated waste liquid tank 6 through the concentrated waste liquid tank return line 12 shown by a broken line, and then the concentrated waste liquid tank 6 is passed through the concentrator return line 13 It may be transferred to the concentrating device 3 and concentrated again. Further, the concentrated waste liquid after chlorine removal by the chlorine removal device 10 can be returned to the waste liquid collection tank 1 through a waste liquid return line 14 indicated by a broken line, and can be concentrated again with other collected waste liquids.

According to the present embodiment, by removing chlorine in the concentrated waste liquid, the degree of concentration can be increased, and the waste liquid can be concentrated again, so that the amount of the concentrated waste liquid generated can be reduced and the efficiency of the equipment can be improved. Operation becomes possible.

Next, a second embodiment of the radioactive liquid waste treatment apparatus according to the present invention will be described with reference to FIG. In addition,
2, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description of the overlapping parts will be omitted. This embodiment is different from the first embodiment in that the waste liquid transfer line 2 connecting the waste liquid collection tank 1 and the concentrator 3 is branched to connect the waste liquid branch line 15, and the waste liquid branch line 15 is used for chlorine removal. This is because it is connected to the device 10, and the chlorine removal device 10 and the waste liquid collection tank 1 are connected by a waste liquid return line 14.

In the present embodiment, however, the waste liquid collected in the waste liquid collection tank 1 is branched from the waste liquid branch line 15 before being transferred to the waste concentrating device 3 and concentrated, and the chlorine removing device is provided.
Transfer to 10 to remove chlorine. The waste liquid from which chlorine has been removed is returned to the waste liquid collection tank 1 via the waste liquid returning line 14 and concentrated in the concentrating device 3.

At this time, the waste liquid after chlorine removal by the chlorine removal device 10 is passed through a direct return line 16 shown by a broken line to directly condense the device 3.
It may be transferred to and concentrated. According to the present embodiment, by removing chlorine in the waste liquid collected in the waste liquid collection tank 1, the degree of concentration in the concentration device 3 can be increased.

Next, a third embodiment of the radioactive liquid waste treatment apparatus according to the present invention will be described with reference to FIG. In addition,
3, those parts that are the same as those corresponding parts in FIG. 1 are designated by the same reference numerals, and a description of the overlapping parts will be omitted.

The part of the present embodiment different from the first embodiment is to install a branch line 17 that branches from the concentrated waste liquid discharge line 5 of the concentrating device 3 and connects to the chlorine removing device 10 to remove chlorine in the concentrated waste liquid. This is because it directly flows into the chlorine removing device 10 for removal, and the chlorine removing device 10 and the waste liquid transfer line 2 are connected by the concentrated waste liquid returning line 11.

Therefore, in the present embodiment, the waste liquid collected in the waste liquid collection tank 1 is transferred to the concentrating device 3 via the waste liquid transfer line 2 and concentrated. The concentrated waste liquid concentrated in the concentrating device 3 flows into the chlorine removing device 10 from the branch line 17, the chlorine is removed by the chlorine removing device 10, and is returned to the concentrating device 3 via the concentrated waste liquid returning line 11.

At this time, the concentrated waste liquid from which chlorine has been removed by the chlorine removing device 10 may be returned to the waste liquid collecting tank 1 through the waste liquid returning line 14 and concentrated again with other collected waste liquids.
According to the present embodiment, the concentration can be increased by removing chlorine in the concentrated waste liquid in the concentrator.

As the chlorine removing method in the chlorine removing apparatus, an electrolysis method, an electrodialysis method, an adsorption method or the like may be appropriately selected depending on the properties of the concentrated waste liquid, and any method may be used.

[0027]

According to the apparatus of the present invention, the concentration process can be performed again by removing the chlorine component in the waste liquid concentrated by the concentration apparatus. Further, by removing the chlorine component in the waste liquid collected in the waste liquid collection tank, it becomes possible to increase the degree of concentration in the concentrator. Therefore, the amount of concentrated waste liquid generated as waste can be reduced, and the equipment can be operated efficiently.

[Brief description of the drawings]

FIG. 1 is a flow diagram showing a first embodiment of a radioactive liquid waste treatment apparatus according to the present invention.

FIG. 2 is a flow chart showing a second embodiment of the radioactive liquid waste treatment apparatus according to the present invention.

FIG. 3 is a flow chart showing a third embodiment of the radioactive liquid waste treatment apparatus according to the present invention.

FIG. 4 is a flow diagram showing a conventional radioactive waste liquid treatment device.

[Explanation of symbols]

1 ... Waste liquid collection tank, 2 ... Waste liquid transfer line, 3 ... Concentrator, 4 ... Distilled water, 5 ... Concentrated waste liquid discharge line, 6 ... Concentrated waste liquid tank, 7 ... Concentrated waste liquid transfer line, 8 ... Solidifying device, 9
… Concentrated waste liquid branch line, 10… Chlorine removal device, 11… Dechlorination concentrated waste liquid return line, 12… Concentrated waste liquid tank return line,
13 ... Concentrator return line, 14 ... Waste liquid return line, 15 ... Waste liquid branch line, 16 ... Direct return line, 17 ... Branch line.

Claims (5)

[Claims] 1. A waste liquid collection tank for collecting radioactive waste liquid generated in a nuclear power plant, a concentrating device for concentrating the waste liquid in the collection tank, and a concentrated waste liquid tank for storing the concentrated waste liquid concentrated by the concentrating device. A radioactive substance characterized by comprising a chlorine removing device for removing chlorine in the concentrated waste liquid in the concentrated waste liquid tank, and a concentrated waste liquid returning line for returning the concentrated waste liquid after chlorine removal by the chlorine removing device to the concentrating device. Waste liquid treatment equipment. 2. A concentration waste liquid return line for returning the concentrated waste liquid after chlorine removal in the chlorine removal device to the concentrated waste liquid tank, and a concentrated waste liquid return line returning from the concentrated waste liquid tank to the concentration device are provided. The radioactive waste liquid treatment apparatus according to claim 1. 3. The radioactive waste liquid treatment apparatus according to claim 1, further comprising a waste liquid return line for returning the concentrated waste liquid after chlorine removal by the chlorine removal device to the waste liquid collection tank. 4. A waste liquid collecting tank for collecting radioactive waste liquid generated in a nuclear power plant, a concentrating device for concentrating the waste liquid in the collecting tank, and a waste liquid transfer line connecting the concentrating device and the waste liquid collecting tank. A radioactive waste liquid treatment apparatus comprising: a branching chlorine removal device for removing chlorine in the waste liquid; and a return line for returning the waste liquid after chlorine removal by the chlorine removal device to a waste collection tank. . 5. A waste liquid collection tank for collecting radioactive waste liquid generated in a nuclear power plant, a concentrating device for concentrating the waste liquid in the collection tank, and a chlorine removing device for removing chlorine in the concentrated waste liquid in the concentrating device. And a concentrated waste liquid return line for returning the concentrated waste liquid after chlorine removal by the chlorine removal device to the concentration device.