JPS608788A - Nuclear reactor housing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a nuclear reactor building equipped with a waste transfer device.

[Technical Background of the Invention] In general, when periodic inspections and modification and repair work of equipment, piping, etc. are carried out at a nuclear power plant, especially in the reactor building, radioactivity with high contamination and high dose rate occurs throughout the entire area. Waste is generated in large quantities. To prevent the spread of contamination, these wastes are usually stored in plastic bags or the like, sealed, and transported to a waste treatment building by the workers who are working on the work, and then canned in drums. When transporting waste generated on each operating floor of the reactor building, the waste is temporarily stored in the contaminated area entrance/exit area within the work area or controlled area, and then transported to the non-contaminated area (radiation controlled area). ) Strict contamination and radiation measurements will be carried out before being transported to Next, the waste is transported to the predetermined upper rear of the waste treatment building via general passageways, elevators, etc. in this uncontaminated area, and then through a double airlock installed to keep the reactor building airtight. Ru.

[Problems with Seiken technology] However, the following problems often occur in the conventional method of transporting radioactive waste as described above.

(a) The amount of radiation exposure for transportation workers will increase.

(1)) If waste from large seedlings is temporarily generated, the waste will pile up in the work area and other areas due to restrictions on the number of transportation personnel, etc., and the radiation level in the vicinity will increase.

(C) In particular, if waste is temporarily stored in contaminated area entrance/exit areas or double airlocks, it will also affect workers and increase the overall radiation exposure.

(d) Area where many workers pass (non-contaminated area)
If contamination spreads due to cracks in plastic bags, etc., the contamination will spread over a wide area within a short period of time, requiring a large amount of manpower and time to dispose of the contamination.

(e) If waste with a high radiation level is moved (transported) carelessly, the radiation area monitor on the passageway will issue an alarm, causing undesirable trouble in the operation of the central control room.

[Object of the Invention] The present invention has been made in order to eliminate the above-mentioned inconveniences, and is to improve waste transportation by quickly transporting radioactive waste to a predetermined location in a waste treatment building without having to go through the process of obtaining radioactive waste. The purpose is to provide a nuclear reactor building that can reduce the amount of radiation exposure for workers and other personnel.

[Summary of the Invention] The reactor building of the present invention is provided with a radioactive waste transfer space extending vertically within the reactor building, a radioactive waste input port communicating with the transfer space is provided on each floor, and A transfer device is installed in the transfer space that connects the lower part of the transfer space and the radioactive waste accumulation area, and the radioactive waste input from each floor [1] is collected without the need for human intervention. It is structured so that it can be accumulated in an area.

[Embodiments of the Invention] Examples of the reactor building of the present invention will be described below with reference to the drawings.

The figure illustrates a case where a waste treatment building 2 is attached to a reactor building 1. At least one radioactive waste input port 3 is installed on each floor of the reactor building 1. The opening communicates with a radioactive waste transfer space 4 provided vertically penetrating each floor of the reactor building 1. In this transfer space 4, a packet conveyor type radioactive waste transfer device 5 is installed. At its lower end, the radioactive waste transfer space 4 communicates with a radioactive waste accumulation area 7 via a radioactive waste transfer space 6 that extends horizontally within the waste treatment building 2. A belt conveyor-type transfer device 9 is installed to transfer the radioactive waste 8 sent by the radioactive waste transfer device 5 to the collection area 7.

The radioactive waste transfer space 6 and the waste treatment building 2 are separated by an aerostat 10 made of double doors to maintain airtightness (negative pressure) inside the reactor building. Furthermore, the interior of the waste treatment building 2 is divided by a partition wall 11 into a drum canning area 12 and a drum can carrying area 13. 1
4 indicates a shutter for carrying out drums.

In the nuclear reactor building of the present invention configured as described above,
For example, radioactive waste 8 generated on the operating floor 15 is not temporarily placed on the floor, but is thrown into the transfer space 4 through the input port 3 each time it is generated. The thrown-in waste 8 is transferred downward by a transfer device 5 within the transfer space 4 and placed on a belt conveyor 9. The waste 8 placed on this belt conveyor is conveyed within the transfer space 6 and collected in a collection area 7.

The waste accumulated and stored in the accumulation area 7 is collected by the waste treatment workers in the waste treatment building 2 and placed in the aero ivy 10
The waste drum is transported to the canning area 12 via
After being drum-canned there, the drums are carried out from the drum carrying-out area 13 and sent to a waste storage (not shown).

As described above, in the reactor building of the present invention, there is no need for human intervention in transferring waste until it reaches the accumulation area 7, and the transfer space 4.6 is used in other areas of the reactor building. Because it is isolated from other areas (walkways, inspection work areas, etc.) and cannot be accessed by general workers, even if contamination occurs due to waste during transportation, it will be limited to local contamination and the contamination will spread over a wide area. Never. Further, since the transfer space 4.6 is constructed to be covered with a shielding wall having the same thickness as the wall dividing each area of the reactor building, the radiation level in the general passage section will not be increased. In addition,
The method of transporting the waste is not limited to mechanically driven devices such as belt conveyors, and may also be, for example, an air shooter using compressed air.

Furthermore, the present invention can be applied even when the waste treatment building 2 is independent from the reactor building 1.1 [Effects of the Invention] As explained above, according to the reactor building of the present invention, periodic inspection Radioactive waste generated in Ogumi due to construction, etc. can be automatically transferred to a designated location in the waste processing building without human intervention, reducing the amount of radiation exposure associated with waste transfer. can do. In addition, the waste transfer space is separated from other inspection work areas and general walkways by shielding walls, so even when high dose rate and highly contaminated waste is transferred, the radiation level in these areas will not increase. Therefore, -C pollution caused by waste will not expand. Furthermore, since the dose rate in the work place, etc. will not be uneven due to waste, the accuracy of predicting the radiation dose of workers will be improved and exposure control will be facilitated.

[Brief explanation of drawings]

The figure is a schematic sectional view showing an embodiment of the nuclear reactor building of the present invention. 1・・・・・・・・・Reactor building 2・・・・・・
・・・・・・Waste treatment building 3・・・・・・・・・・・・
・Waste input port 4.6...Transfer space 5.9...Transfer device 7...Radioactive waste accumulation area 8
...... Radioactive waste 10...
・・・・・・Aerotsuku 11・・・・・・・・・・・・
・Parting wall

Claims (3)

[Claims] (1) A radioactive waste transfer space extending vertically within the reactor building is provided, and a radioactive waste input port communicating with the transfer space is provided on each floor, and the lower part of the transfer space and the radioactive waste accumulation area are provided. A nuclear reactor building characterized in that a transfer device is provided in a transfer space connecting between the reactor buildings. (2) A packet conveyor type waste transfer device is installed in the waste transfer space extending in the vertical direction (a nuclear reactor building according to claim 1). (3) A nuclear reactor building according to claim 1, wherein an air shooter is provided in the waste transfer space extending in the vertical direction.