JPS5863895A - Dry type storage method of radioactive material and the like - 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 The present invention provides a storage cask for safely storing spent nuclear fuel with high radiation sickness and calorific value, or a sieve-level glass solidified solidified substance of fissile substances, etc., for safely storing radioactive materials. Regarding dry storage methods such as

One storage method is to store spent nuclear fuel or fissile material in storage casks weighing 65 to 140 tons at a nuclear power plant site, in a reprocessing facility, or in micro-storage. There is a method of removing heat generated from the cask by placing an IC in a facility such as a building or by taking in outside air.

In other words, as shown in Figures 1 and 2, the plans for storing spent nuclear fuel or high-level vitrified materials in casks that have been announced so far have been designed to draw outside air from both sides of the IC building (ti11 walls). The amount of heat generated from the storage casks is removed by natural ventilation, which is discharged outdoors from the grill on the ceiling.

However, due to the structure of the A building, it is difficult to remove heat from the storage casks by natural ventilation using the heat removal method described above. There were other difficulties.

In view of the above-mentioned circumstances, this invention has been developed to provide a storage cask for storing spent nuclear fuel with high radioactivity and calorific value, or high-level glass assimilate solidified fission injection material. In facilities that store a large number of storage casks, outside air is introduced from under the floor of the building to remove the amount of heat generated from the storage casks, and each cask is exposed to the ventilation IC almost evenly, especially for the storage casks placed in the center. It provides a method for dry storage of radioactive materials, etc., with the purpose of increasing their effectiveness.

Hereinafter, embodiments of the present invention will be explained in detail with reference to FIGS. 3 to 6. Figures 3 to 4
The figure shows a perspective view and an internal plan Lfj diagram of a facility that stores a large number of storage casks according to the present invention.
C1'lFf storage bit 2 is located in the area, adjacent to the control room 3
, a repair room 4, a loading dock 5, etc., as well as a changing room 6 to ensure the safety of 1c workers, and a food inspection room 7. There are 8 neuterity rooms and other rooms.

In addition, outside air intake ports 11 are provided on both side walls of the Japanese house 1 to accommodate the storage cask 10 with the constant r'fi constant vcrx and the storage cask zHvc.

FIG. 5 shows an embodiment according to the present invention, A-A in FIG.
It is a line cross-sectional view, and a ceiling part VC in a Japanese house 1 is provided with a ceiling outlet 12 for exhaust air.

- In addition, a VC ventilation duct 13 was formed so that the ventilation coming in from the outside air intake 11 installed on both sides of the Japanese house I was guided under the floor of the room. The area around the storage cask IO placed aI4 is ventilated with an average VC, and the storage cask lυ is evenly exposed to the outside air.
It's C.

P, the above-mentioned Kuniya 1/Q U) A rubber servo 15 is installed on the ceiling via a rail 16, and this traverser 15rc is installed and hung from a crane 17. The storage cask 10 can be lifted from the 18 Vc and moved to a predetermined location.

On the other hand, FIG.
The passage 19 is drawn from the duct 13 so that it reaches approximately the central part of the pressure surface (VC), and the storage bits 2 on the floor are averaged VC, Ifl! FI'j is like a wind.

Therefore, as mentioned above, heat is removed from the ventilation zone 71 by the outside air coming in from the outside air intake ports 11 on both side walls of the storage cask 1orr on which the storage bit 2Vc of @ + Kizanakko is placed. 10. Heat is removed uniformly throughout the entire structure.

As explained above in detail, the dry storage method for radioactive materials, etc. according to the present invention was constructed by Kenpokuya in a facility with a large number of storage casks.

Outside air needle bed for heat removal r) 4 From the ceiling to the outdoors 21
1-1'-vc, J:jJ, each cask is exposed to ventilation IC almost uniformly, especially the center! ! The heat removal effect of the skin-like cask is improved. Also listed!
In addition to the simultaneous installation of li units, reinforced concrete VC, 11,
There is also a method of connecting it to the floor and creating it as an integral piece.

[Brief explanation of the drawing]

Figure 1, Figure 52a, a vertical sectional view and internal plan view of a Japanese house showing an example of a conventional dance; Figure 3 is a perspective view of a Japanese house showing an embodiment of the present invention; Figure 4, group 3; 5 is a sectional view taken along the line A-A in FIG. 4, and FIG. 6a is a sectional view taken along the line A-A in FIG. 4, showing another embodiment of the present invention. ■...Kuniie, 2...Storage bit, 1O...Storage cask, 11...Outside air intake, Work 2...Ceiling outlet. 13... Ventilation duct, 14... Mounting table, 19...
aisle. 5-

Claims (1)

[Claims] Storage casks that store spent nuclear fuel with high radioactivity and calorific value, or high-level vitrified solidified fissile materials, etc.In facilities where a large number of spent nuclear fuels and fissile materials are stored, outside air is used to remove heat from the storage casks. A dry storage method for radioactive materials, etc., in which the air is guided from under the floor through ventilation ducts through outside air intakes in both walls of the frog house, and then released to the outdoors through ceiling exhaust ports.