JPH09113692A - Radioactive material storage facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage facility capable of removing heat uniformly from radioactive materials stored in a storage room. SOLUTION: A storage facility 10 is one for spent nuclear fuel assemblies and the radioactive materials etc. which has a storage room 20 surrounded with underground outer walls 22 and a plurality of concrete lid bodies 25 arranged side by side, closing the upper opening 24 of the storage room 20. Here, the plurality of lid bodies 25 are arranged in different levels of upper direction so that the end of one overlaps on the end of others put adjacently and that gaps S are formed between those ends. Also, each lid body 25 is arranged so that the radioactive materials 1 are in dead angle of the lid bodies 25 and are not seen through the gaps S from outside the storage room 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage facility for radioactive materials such as spent fuel and radioactive waste generated in nuclear power plants, reprocessing facilities and the like.

[0002]

2. Description of the Related Art Conventionally, radioactive substances such as spent nuclear fuel and radioactive waste generated in nuclear power plants and reprocessing facilities have been stored in, for example, a storage container. There is a so-called dry storage system in which is stored in a building for a storage facility. That is, in this system, for example, as shown in FIG. 4, a storage room 42 surrounded by an underground outer wall 41 and the like is built in a storage facility building 40, and a storage container 43 is stored in the storage room 42. At the same time, the upper opening 44 of the storage chamber 42 is closed by the lid 45 made of concrete. According to this method, the underground wall 4
1 and the lid 45 made of concrete, the storage container 43
It is possible to shield the radiation generated from the environment and eliminate the influence of the radiation on the surrounding environment.

Further, in this dry storage system, the storage container 4
An air supply / exhaust shaft 48 may be provided in order to exhaust the heat generated from No. 3 to the outside of the storage chamber 42. The air supply / exhaust shaft 48 is, for example, the air supply shaft 4 that communicates with the storage chamber 42 from an air supply port 46 a provided in the side wall 40 a of the building 40.
6 and an exhaust shaft 47 that communicates from the storage chamber 42 to an exhaust port 47a provided at the top of the building 40.

In order to remove the heat of the storage container 43 by the air supply / exhaust shaft 48, the outside air of the building 40 is sucked from the intake port 46a and supplied into the storage chamber 42 via the air supply shaft 46. Here, the heat of the storage container 43 is removed. The air whose temperature has risen by removing heat from the storage container 43 passes through the exhaust shaft 47 and is discharged to the outside air from the exhaust port 47a on the rooftop. According to this, there is an advantage that it is possible to remove the heat of the storage container 43 while preventing the radiation generated from the storage container 43 from being radiated to the outside of the building 40.

[0005]

However, in the above-mentioned storage facility, since the path of the air supplied to the storage chamber 42 is only one direction, the storage container arranged on the intake shaft 46 side to which the outside air is supplied. 43 and intake shaft 46
There is a problem in that there is a difference in the heat removal effect between the storage container 43 and the storage container 43 that is disposed on the side of the exhaust shaft 47 that is separated from. That is, the storage container 43 arranged on the intake shaft 46 side is relatively easily removed of heat, but as the distance from the intake shaft 46 side increases, the air whose temperature has risen due to the removal of heat passes therethrough. The storage container 43 arranged on the side tends to be more difficult to remove heat than the one arranged on the intake shaft 46 side.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a radioactive substance storage facility capable of uniformly removing heat from a radioactive substance stored in a storage chamber.

[0007]

To achieve the above object, a radioactive substance storage facility according to the present invention comprises a storage chamber surrounded by a shielding wall and a plurality of storage chambers which are arranged adjacent to each other to close an upper opening of the storage chamber. A storage facility for radioactive materials such as spent nuclear fuel and radioactive waste, which is provided with a concrete lid, and a plurality of lids are provided with ends of other lids adjacent to each other. The lids are arranged so as to be vertically overlapped with each other so that a gap is formed between these ends, and each of these lids is provided with a radioactive substance from the outside of the storage chamber via a gap. It is installed so as to be placed in a blind spot position of the lid body that is not directly viewed (Claim 1).

In the radioactive substance storage facility, a support wall for supporting a plurality of lids is arranged in the storage chamber.
It is preferable that a convex portion is formed on the upper portion of the support wall to support the adjacently arranged lid bodies by providing stepped portions in the vertical direction (claim 2).

According to the radioactive substance storage facility of the present invention having the above-mentioned constitution, a plurality of concrete lids arranged at the upper opening of the storage chamber for storing the radioactive substances are provided at their end portions. Since the gaps are formed so as to form a gap therebetween, air whose temperature has risen due to heat removal can be exhausted from this gap. Since this gap can be arranged over a wide range above the radioactive substance, air can be efficiently exhausted over a wide range, and heat can be uniformly removed over the entire storage chamber. .

Further, the lid body is arranged so that its end portion vertically overlaps with the end portions of other lid bodies arranged adjacent to each other, and the radioactive substance is directly viewed from the outside of the storage chamber through a gap. Since it is installed in a position that is a blind spot of the lid so that it is not blocked, the radiation emitted from the radioactive substance is shielded by the lid and is not emitted to the outside through the gap.

According to the radioactive substance storage facility of the second aspect of the present invention, a support wall having a convex portion formed on the upper portion thereof is provided in the storage chamber, and the lid body is provided with a step up and down. By being provided and supported, it is possible to easily dispose the lids that are arranged adjacent to each other in the upper opening so that the ends thereof overlap each other and a gap is formed between these ends. it can.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 (a), (b)
2 and FIG. 2 show a storage container 1 according to the first embodiment of the present invention.
It is a horizontal sectional view and a side sectional view showing storage facility 10 which stores.

In FIGS. 1A and 1B, the storage facility 10 is a structure that is roughly composed of an above-ground structure portion 11 and an underground structure portion 12. The above-ground structure portion 11 is provided with a carry-in entrance 14 which is opened and closed by an opening / closing door 14a and into which the trailer 13 enters, and in the vicinity of this carry-in entrance 14, an inspection area where the trailer 13 coming in from the carry-in entrance 14 is stopped. 15 is provided so as to face a container storage area 20 which is a storage chamber of the storage container 1 described later.

Further, in the ground structure portion 11, a temporary storage area 16 is provided adjacent to the inspection area 15 for temporarily temporarily storing the storage container 1a newly loaded by the trailer 13. These inspection areas 15
Further, above the temporary storage area 16, an overhead crane 17 for lifting up the storage container 1 and transporting the storage container 1 in the horizontal direction is arranged as shown in FIG.

This overhead crane 17 has an above-ground structure portion 1.
A horizontal member 17a that is installed so as to cross over the inspection area 15 and the temporary placement area 16 in the vicinity of the ceiling part 1
And a hoist 17d for carrying the storage container 1 that slides along the horizontal member 17a, and a hoist 17d that is hung up and down freely and engaged with the storage container 1 to lift it up. And a hook 17b for.

The horizontal member 17a is mounted on the pair of rails 10a, 10a arranged in parallel along the longitudinal direction of the storage facility 10 (the depth direction of the paper in FIG. 1 (b)), and the driving wheel 1a.
It is movably supported via 7c. The horizontal member 17a moves on the rails 10a and 10a along the longitudinal direction by rolling the drive wheel 17c.

In this embodiment, as shown in FIG. 1 (a), in addition to the above-mentioned equipment, the above-mentioned equipment includes an electric power distribution room 18 and a storage facility for maintenance and security of the facility. An entrance / exit management room 19 is provided for managing persons who enter and exit the room 10.

On the other hand, the underground structure portion 12 constituting the underground portion of the storage facility 10 has a container storage area 20 which is a storage room mainly for radioactive materials. The container storage area 20 is configured by surrounding a space on the foundation 21 of the storage facility 10 with an underground outer wall 22 that is a shielding wall, and is constructed below the ground surface G in the present embodiment. . A concrete floor slab 21a is provided on the upper surface of the foundation 21, and the storage container 1 is placed on the concrete slab 21a.

An upper opening 2 is provided at the upper part of the container storage area 20.
4 is provided, and this upper opening 24 is closed by a plurality of concrete lids 25, 25. The lid 25 is detachably arranged in the upper opening 24, and is set to have a thickness such that radiation can be prevented from passing therethrough, or a steel plate, a lead plate or the like is arranged inside. And has a function of shielding radiation.

Then, in order to newly carry in the storage container 1a into the container storage area 20, the lid 25 at the place where the storage container 1a is carried in is removed, and the hook 17b is attached to the storage container 1a.
And the hoist 17d and the horizontal member 17a are moved to convey the storage container 1a.

As shown in FIG. 2, the plurality of lids 25, 25 have their ends vertically overlapped with the ends of other lids 25 adjacent to each other, and a gap is provided between these ends. It is arranged in the upper opening 24 so that S is formed. Then, each of these lids 25 is installed in the upper opening 24 so as to be arranged in a blind spot position of the lid 25 such that the storage container 1 is not directly viewed from the outside of the container storage area 20 through the gap S. There is.

In particular, in this embodiment, the container storage area 2
A plurality of lids 25, 2 that divide the inside of the lid 0 and
5, supporting walls 26, 26 are provided, and a convex portion 26a is formed on the upper portion of the supporting walls 26, 26, whereby the adjacent lids 25, 25 are stepped up and down. It is provided and supported.

In this embodiment, the container storage area 2
As shown in FIGS. 1 (a) and 1 (b), 0 is provided with an air supply shaft 32 that communicates with the container storage area 20 from the air supply port 30 provided in the side wall 11 a of the above-ground structure portion 11. ing. The air supply port 30 has a hood 30b that is provided outside the side wall 11a and has an intake port 30a that opens downward. The air supply shaft 32 extends vertically, and extends from the intake port 30 to the container storage area 2.
It leads to the air supply opening 32f provided in 0.

In order to remove the heat of the storage container 1 stored in the container storage area 20 by means of the air supply port 30 and the air supply shaft 32, the outside air of the storage facility 10 is set as shown in FIG.
As indicated by the arrow in (b), first, the hood 30b is sucked upward from the intake 30a of the hood 30b. The outside air moves downward in the air supply shaft 32 and is then supplied into the container storage area 20 through the air supply opening 32f, where heat of the storage container 1 is removed and the container storage is performed. Pass through the area 20.

Next, the air whose temperature has risen by removing heat from the storage container 1 is discharged into the above-ground structure portion 11 through the gap S between the ends of the lids 25, 25 above the storage container 1.
The released air is exhausted to the outside of the storage facility 10 via the exhaust gallery 31 provided on the upper portion of the above-ground structure portion 11.

According to the storage facility 10 having such a structure,
Since the lid 25 is arranged in the upper opening 24 of the container storage area 20 so that a gap S is formed between these ends, air whose temperature has risen due to heat removal can be exhausted from this gap S. it can. In particular, in the present embodiment, since the plurality of gaps S are provided so as to cross the container storage area 20, they are arranged over the storage container 1 over a wide range, and the exhaust of air is performed over a wide range. Can be efficiently performed, and heat can be uniformly removed over the entire container storage area 20.

The lid 25 is arranged so that the end of the lid 25 vertically overlaps the end of another lid 25 adjacent to the lid 25, and the storage container 1 is provided from the outside of the container storage area 20. The lid 25 is provided so as not to be directly viewed through the gap S.
The radiation emitted from the storage container 1 is shielded by the lid 25 and the space S
It is not radiated to the outside via.

Next, a second embodiment of the present invention will be described in detail with reference to FIG. Since the configuration of the storage facility in this embodiment is almost the same as that of the first embodiment described above, the description will be given using the same reference numerals except for the main parts.

The gist of the present embodiment is that the container storage area 20 provided below the ground surface G in the first embodiment is provided above the ground surface G.

That is, as shown in FIG.
Reference numeral 0 is a structure that is roughly configured only from the above-ground structure portion 11, and like the storage facility 10 described above, the trailer 13
A loading port 14, an inspection area 15 and a temporary storage area 16 are provided facing the container storage area 20. Above these, the storage container 1 is lifted up as shown in FIG. However, an overhead crane 17 is provided for horizontally transporting the crane.

In this embodiment, the container storage area 20 is constructed by surrounding a part of the space in the above-ground structure portion 11 with a shielding wall 53 on the foundation 21 of the storage facility 50. Built on surface G. A concrete floor slab 21a is provided on the upper surface of the foundation 21, and the storage container 1 is placed on the concrete slab 21a.

Of the shielding walls 53 facing the inspection area, the opening / closing port 5 leading to the inside of the container storage area 20.
2 are provided. The opening / closing port 52 has an opening / closing door 52a.
Is provided, and the storage container 1 is carried into the container storage area 20 via this.

An upper opening 24 is provided in the upper portion of the container storage area 20, and the upper opening 24 is closed by a plurality of concrete lids 25. Then, when the storage container 1a is newly carried into the container storage area 20, the lid 25 at the location where the storage container 1a is carried in.
Is removed and the passage for the overhead crane 17 is secured.

Similar to the above-described first embodiment, the lid 25 has its end portion vertically overlapped with the end portion of another lid member 25 adjacent thereto, and a gap S is formed between these end portions.
Are disposed in the upper opening 24 so that Also,
In the container storage area 20, the storage container 1 is installed at a position that is a blind spot of the lid 25 so as not to be directly viewed from the outside of the container storage area 20 through the gap S.

In particular, in this embodiment, the container storage area 2
In the support walls 51, 51 arranged in 0,
A passage 54 is formed extending from the opening / closing port 52 and extending vertically through the container storage area 20. Then, on the upper portions of these support walls 51, 51, convex portions 51a, 51a are formed at positions facing each other with the passage 54 sandwiched therebetween, so that the lids 25, 25 arranged adjacent to each other are provided with a step difference in the vertical direction. I support you.

Also in this embodiment, as in the above-described embodiment, in the container storage area 20, as shown in FIGS. 3 (a) and 3 (b), the air supply port arranged on the side wall 11a. An air supply shaft 32 that communicates with the container storage area 20 from 30 is provided.

According to such a storage facility 50, since the container storage area 20 is constructed on the ground surface G, there is an advantage that the storage container 1 can be easily carried in.

[0038]

As described in detail above, claim 1 is as follows.
According to the radioactive substance storage facility of the invention described above, a plurality of concrete lids arranged at the upper opening of the storage room for storing the radioactive substance are vertically arranged so that a gap is formed between these ends. Since a step is provided in the space, air whose temperature has risen due to heat removal can be exhausted from this gap. Since this gap can be arranged over a wide range above the radioactive substance, air can be efficiently exhausted over a wide range, and heat can be uniformly removed over the entire storage chamber. .

Further, the lid body is arranged so that its end portion vertically overlaps with the end portions of the other lid bodies arranged adjacently, and the radioactive substance is directly viewed from the outside of the storage chamber through a gap. Since it is installed in a position that is a blind spot of the lid so that it is not blocked, the radiation emitted from the radioactive substance is shielded by the lid and is not emitted to the outside through the gap. As a result, it is possible to uniformly remove heat from the radioactive substance in the storage chamber while preventing the radiation emitted from the radioactive substance from being emitted from the storage chamber to the outside.

Further, according to the radioactive substance storage facility of the second aspect of the present invention, a support wall having a convex portion formed on the upper portion thereof is provided in the storage chamber, and the lid body is provided with a step up and down. By providing and supporting, the adjacently arranged lid bodies can be easily arranged in the upper opening so that their ends are vertically overlapped with each other and a gap is formed between these ends. .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of a radioactive substance storage facility according to the present invention, in which (a) is a plan sectional view thereof and (b) is a side sectional view thereof.

FIG. 2 is a perspective view showing only a container storage area (storage room) in FIG.

3A and 3B are explanatory views showing a second embodiment of the radioactive substance storage facility according to the present invention, in which FIG. 3A is a plan sectional view thereof, and FIG.

FIG. 4 is a front sectional view showing a building for a conventional radioactive substance storage facility.

[Explanation of symbols]

 1 Storage Container (Radioactive Material) 10 Storage Facility 20 Container Storage Area (Storage Room) 22 Underground Outer Wall 24 Upper Opening 25 Lid S Space

Claims (2)

[Claims] 1. A used nuclear fuel, radioactive waste, etc., comprising a storage chamber surrounded by a shielding wall, and a plurality of concrete lids which are adjacently arranged to close an upper opening of the storage chamber. A radioactive substance storage facility, wherein the plurality of lids have an end portion vertically overlapping with an end portion of another lid member disposed adjacent to each other, and a gap is formed between these end portions. It is arranged with a step on the top and bottom,
Each of these lids is installed so as to be arranged in a blind spot position of the lid so that the radioactive substance is not directly viewed from the outside of the storage chamber through the gap. Storage facility. 2. The radioactive substance storage facility according to claim 1, wherein a support wall that supports the plurality of lids is disposed in the storage chamber, and an upper portion of the support wall includes: A storage facility for radioactive materials, characterized in that a convex portion is formed to support the adjacently arranged lids by providing a step on the top and bottom.