JPS59225398A - Cask custody facility for nuclear electric power generating site - 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 relates to a cask storage facility at a nuclear power generation site for storing spent nuclear fuel.

At a nuclear power plant, in order to store spent nuclear fuel before sending it to a reprocessing facility, the cask containing the nuclear fuel is transported to the cask storage facility, placed in a designated storage facility, and fixed. In order to radiate heat generated from nuclear fuel, it is known that fins or the like are provided on the surface of the cask to remove heat through natural ventilation.

If a chimney is installed at the top of the cask storage facility for natural ventilation, if the chimney collapses due to an earthquake or other accident, the natural ventilation will disappear, and the heat from the cask will not be removed, causing the surface temperature to drop. There is a possibility that the specified value will be greatly exceeded.

If the area of such cask storage equipment to be made earthquake-resistant is limited to the cask storage warehouse with a semicylindrical shelter, there is a risk that the flue and chimney may collapse.

Therefore, the present invention provides natural ventilation by allowing the air inlet installed at a higher position than the cask to function as a chimney even if the chimney collapses in the event of an accident such as an earthquake in the natural ventilation type cask storage facility as described above. This was done with the purpose of generating wind power to remove heat from the cask and to avoid an increase in the cask surface temperature.

That is, the cask storage facility for a nuclear power generation site of the present invention has a cask loading/unloading area and a transport path capable of transporting casks from the cask loading/unloading area to a predetermined cask storage. An air intake port is provided at a position higher than the cask storage position, a ventilation lever communicating with the air intake port is opened at the bottom of the cask storage area, and a chimney is disposed at the upper part of the conveyance passage communicating with the cask storage area. It is characterized by the fact that it was established.

An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a plan view of the entire cask storage facility according to the embodiment of the present invention, and Fig. 2 is a side view taken in the I-I direction of Fig. 1. The cross-sectional view, FIG. 3, is an enlarged front cross-sectional view in the direction ■--■ of FIG.

This cask storage facility is installed at a nuclear power generation site, and is equipped with a cask loading and unloading area 2 where casks 1 are loaded and unloaded using a trailer 7 and other equipment, and where receiving inspections of casks are carried out. There is.

Next, in this loading/unloading area 2, the cask 1 is transferred and fixed onto a straddle-type carrier 3, and the carrier 6
At the same time, a conveyance path 6 having a conveyance carriage pull-in rail 5 capable of conveying the cask 1 to a predetermined cask storage 4 is provided.

Here, as shown in FIG. 1, a plurality of cask storages 4 are arranged in the building 8 on both sides of the transport path 6, and on the other hand, on the side of the cask transport area 2, there is a machine room. 9, an electrical room 10 and other necessary areas 11 are provided.

In addition, as shown in FIG. 2, the cask storage 4 is
1 is formed into a wedge-shaped shelter, and a storage trolley 12 that can be pulled out into the transport passage 6 is installed inside the shelter. After being transferred and fixed to cask storage, the storage cart 12 is put into the cask storage 4 and fixed to the cask storage using a coupler.

On the other hand, as shown in FIG. 3, an intake port 13 is provided in the side wall of each cask storage 4 at the storage position of the cask 1, and a ventilation louver 14 communicating with the intake port 16 is provided in the side wall of each cask storage 4. A chimney 16 is installed at the top of the conveyance passage 6 which opens at the bottom and also serves as a flue communicating with each cask storage 4.
has been set up.

In the cask storage facility of the present invention having the above configuration, the outside air is sucked in through the intake port 16.

As shown by arrow A in the figure, ventilation is introduced from the lower part of the cask storage 4 and the storage cart 12 via the ventilation louver 14 to uniformly adjust ventilation, and is heated by the heat generated from the cask 1 and flows to the upper part of the cask storage 4. After that, the gas passes through the conveying passage 6 which also serves as a flue, and is discharged from the chimney 16 into the atmosphere by the natural draft generated by the chimney 16, thereby removing heat from the cask 1.

Note that the storage cart 12 of this embodiment is provided with a skirt 15 so that heat from the cask 1 can be uniformly removed.

Therefore, as shown in Figure 4, in the unlikely event that an earthquake occurs and the chimney 16 collapses, the intake port 16 is installed at a higher position than the cask 1, so it will not function as a chimney. 16 chimneys collapsed due to natural ventilation
The air sucked in from the side enters the intake port 13 as shown by arrow B.
It will flow to the side.

Therefore, in the cask storage facility of the present invention, even if the chimney collapses due to an accident, a certain degree of natural ventilation is always maintained, heat can be removed from the cask, and the temperature rise around the cask can be kept to a minimum. This has the effect of preventing danger.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the entire cask storage facility in an embodiment of the present invention, FIG. 2 is a side sectional view taken in the direction 1-■ of FIG. 1,
Figure 3 is an enlarged front sectional view in the II-II force direction of Figure 1;
The figure is an explanatory diagram showing the air flow after a disaster. 1... Cask, 2... Cask loading/unloading area, 4
...Cask storage, 6...Transportation passage, 13...
Intake port, 14... Ventilation louver, 16... Chimney.

Claims (1)

[Claims] In a cask storage facility having a cask loading/unloading area and a transport passageway capable of transporting casks from the cask loading/unloading area to a predetermined cask storage, an air intake port is provided at a position higher than the cask storage position of the cask storage, and A cask storage facility for a nuclear power generation site, characterized in that a ventilation louver communicating with an air intake port is opened at the bottom of the cask storage, and a chimney is provided at the top of the transport passage communicating with the cask storage.