RU56705U1 - DEVICE FOR OVERLOADING LIQUID RADIOACTIVE WASTE - Google Patents

Abstract

The device relates to the field of environmental protection, and more specifically, to the field of processing of radioactive waste (RW) by fixing it in a stable solid environment

A device for transshipment of liquid radioactive waste contains a container equipped with a nozzle for supplying liquid radioactive waste and connected by pipelines through the receiver to a gas source. A tube equipped with an expander and configured to connect to the container is installed inside the container.

6 c.p. f-ly, 1 ill.

Description

The inventive device relates to the field of environmental protection, and more specifically to the field of processing of radioactive waste (RW) by fixing it in a stable solid environment. The most effectively claimed device can be implemented when cementing homogeneous liquid radioactive waste (LRW), such as leaks, solutions from regeneration, deactivation, LRW of nuclear power plants (NPPs) and radiochemical plants.

A device for transshipment of liquid radioactive waste [A. Nikiforov, V. V. Kulichenko, M. Zhikharev. Neutralization of liquid radioactive waste. M: Energoatomizdat, 1985, p.133-134.], Including a screw feed mixer with nozzles for a dry cement tank, LRW tank and reagents, a sodium silicate tank and a container for the finished LRW product, are mixed with the mixing aqueous phase (in case of cementation of solid LRW) and together with dry cement is fed into a screw feed mixer, which homogenizes the mixture and transports it into a container, sodium silicate is fed to the heap, intended to improve the quality of the finished product.

A disadvantage of the known device is its reduced reliability associated with the danger of driving a screw feed mixer.

Another disadvantage is the lack of measuring equipment for feeding LRW into the mixer, which can lead to an overdose of LRW into the mixer and to reduced quality of the final product in the container.

The closest in technical essence to the claimed device is a device for overloading LRW [Sobolev I.A., Khomchik L.M. Disposal of liquid radioactive waste on centralized

points. M: Energoatomizdat, 1983, p.77-78.], Including a mixing unit, which is a container with a screw mixer and a drain device, a pipeline for feeding LRW into the mixing unit, a cement hopper with a screw spatula - cement dispenser.

The known device operates as follows. LRW through the pipeline for supplying LRW is fed into the mixing unit. After mixing LRW with the help of a screw feeder - a cement dispenser, a predetermined amount of cement is fed into the mixing unit from the cement hopper. The supply of cement to the mixing unit is carried out with the mixer running. After filling the working volume of the mixing unit, the flow of cement is stopped. The mixture is stirred until complete homogenization, after which, when the mixer is working, the resulting radioactive cement mortar is unloaded through a drain device into a container, which is sent for long-term storage to a specialized storage facility, where it sets with the formation of cement stone.

The disadvantages of the known device are: - reduced reliability of the device, due to the fact that, due to its structural features, it is possible to clog the drain device. The device does not provide for the measurement of the amount of LRW supplied to the mixing unit, which does not allow to establish the optimal ratio of components. It is also possible to overdose the cement in the mixing unit, which leads to its quick setting upon contact with LRW, which also leads to clogging of the drain device and shutdown the whole device.

The advantages of the claimed device are:

- improving the reliability of the device;

- improving the quality of the final product

These benefits are ensured by the fact that

The inventive device for transshipment of liquid radioactive waste contains a container with a nozzle for supplying LRW and connected by a pipe through the receiver to a gas source, and inside the tank there is a tube for reloading LRW, equipped with an expander, and made with the possibility of connection with a subsequent tank or container with a mixer, into which serve cement.

An agitator is installed inside the tank.

The end of the tube for LRW reloading is installed near the bottom of the tank.

The tank is also additionally equipped with a nozzle for supplying bubble gas and a level gauge.

The use of a tube for overloading LRW for unloading LRW simplifies the device. The absence of valves and moving parts (such as screws), where mechanical breakdowns are possible, eliminates them.

Overloading liquid radioactive waste from the tank by increasing pressure, with the possibility of interrupting the flow of LRW due to pressure equalization, allows the formation of portions of specified volumes.

The supply of liquid radioactive waste in portions into the container, with the possibility of mixing each portion, ensures controlled filling of the container and ensures uniformity of the mixture, which improves the quality of the blocks.

The essence of the claimed device is illustrated in the drawing, which shows a diagram of the device, where:

1 - capacity;

2 - mixer;

3 - pipe supply LRW in the tank;

4 - level gauge;

5 - external gas source;

6 - pipe for supplying bubble gas;

7 - tube for LRW reloading;

8 - expander;

9 - site supply of cement and additives to the container;

10 - container with a mixer;

The device operates as follows.

Liquid radioactive waste through the nozzle for the supply of LRW 3 when the mixer 2 is turned on is fed into the tank 1, monitoring the amount of LRW using the level gauge 4. When the tank 1 is filled, the LRW supply is stopped and the mixing process continues. To intensify the mixing process, additional bubbling gas is supplied through the nozzle 6. After that, the gas pressure in the tank is increased from the external gas source 5 and through the tube for overloading the LRW 7 and the expander 8, the LRW is fed into the container 10. The cement from unit 9 is also supplied to the container. In the container, the compound is mixed using the mixer located there, after which it is closed and sent for long-term storage.

Claims (6)

A device for transferring liquid radioactive waste, containing a container equipped with a pipe for supplying liquid radioactive waste and connected by a pipe through the receiver to a gas source, a tube for transferring liquid radioactive waste, equipped with an expander and configured to connect to the container, is installed inside the container. 2. The device according to claim 1, characterized in that the tube for reloading liquid radioactive waste is made with the possibility of connection with a subsequent capacity. 3. The device according to claim 1, characterized in that the end of the tube for transshipment of liquid radioactive waste is installed near the bottom of the tank. 4. The device according to claim 1, characterized in that a mixer is installed inside the tank. 5. The device according to claim 1, characterized in that the tank is additionally equipped with a nozzle for supplying bubble gas. 6. The device according to claim 1, characterized in that the tank is additionally equipped with a level gauge.