JP3152125B2 - Radioactive material storage facility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, in order to store radioactive materials such as spent nuclear fuel and radioactive waste generated in a nuclear power plant or a reprocessing facility, for example, the radioactive materials are stored in a storage container, and the storage container is used. There is a so-called dry storage method in which the waste is stored in a building for a storage facility. That is, in this method, as shown in FIG. 4, for example, a storage room 42 surrounded by an underground outer wall 41 or the like is constructed 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 room 42 is closed by a lid 45 made of concrete. According to this method, the underground outer wall 4
1 and the storage container 43 by the concrete lid 45.
Can be shielded, and the influence of the radiation on the surrounding environment can be eliminated.

In this dry storage system, the storage container 4
In some cases, a supply / exhaust shaft 48 is provided to exhaust the heat generated from 3 to the outside of the storage chamber 42. The air supply / exhaust shaft 48 is, for example, an air supply shaft 4 that communicates with the storage chamber 42 from an air supply port 46 a provided in a side wall 40 a of the building 40.
6 and an exhaust shaft 47 communicating from the storage room 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 supply / exhaust shaft 48, the outside air of the building 40 is sucked from the intake port 46 a and supplied into the storage chamber 42 via the supply shaft 46. Here, the heat of the storage container 43 is removed. The air whose temperature has risen by removing the heat of the storage container 43 is discharged to the outside air through an exhaust shaft 47 through an exhaust port 47a at the rooftop. According to this, there is an advantage that the heat of the storage container 43 can be removed while preventing 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 in only one direction, the storage container disposed on the side of the intake shaft 46 to which the outside air is supplied. 43 and an intake shaft 46
There is a problem that there is a difference in the heat removal effect between the storage container 43 and the storage container 43 disposed on the exhaust shaft 47 side separated from the storage container 43. That is, although the storage container 43 disposed on the intake shaft 46 side is relatively easy to remove heat, the air whose temperature has increased due to the removal of heat passes through the storage container 43 as the distance from the intake shaft 46 increases. The storage container 43 arranged on the side tends to be less likely to remove heat than the storage container 43 arranged on the intake shaft 46 side.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a radioactive material storage facility capable of uniformly removing heat from a radioactive material stored in a storage room.

[0007]

In order to achieve the above object, a radioactive substance storage facility of the present invention is provided with a storage room surrounded by a shielding wall and a plurality of storage rooms arranged adjacent to each other to close an upper opening of the storage room. A storage facility for radioactive materials such as spent nuclear fuel and radioactive waste, comprising a concrete lid of the above, wherein the plurality of lids are the ends of other lids whose ends are arranged adjacently. pieces and provided with a step up and down as part a and the gap between the ends so as to overlap vertically are formed
Separately and detachably provided , each of these lids is installed such that the radioactive substance is disposed at a blind spot position of the lid such that the radioactive substance is not directly viewed from outside of the storage chamber through the gap. , Where the radioactive material is carried in
Is removed, and the radioactive material is carried into the storage room (claim 1).

In the radioactive substance storage facility, a support wall for supporting a plurality of lids is provided in the storage chamber,
It is preferable that a convex portion is formed on the upper portion of the support wall to support the lid body that is arranged adjacently with a step provided vertically.

According to the radioactive material storage facility of the present invention having the above structure, a plurality of concrete lids are provided at the upper opening of the storage room for storing the radioactive material. Since the space is formed so as to form a gap therebetween, air whose temperature has increased due to heat removal can be exhausted from the gap. Since this gap can be disposed over a wide area above the radioactive material, the air can be efficiently exhausted over a wide area, and the heat can be uniformly removed over the entire storage room. .

The lid is disposed so that its end is vertically overlapped with the end of another lid disposed adjacent thereto, and the radioactive substance is directly viewed from outside the storage chamber through a gap. Since it is installed at a position where the lid becomes a blind spot, the radiation emitted from the radioactive material is shielded by the lid and does not radiate outside through the gap.

According to the radioactive material storage facility of the present invention, a support wall having a convex portion formed on an upper portion thereof is provided in the storage chamber, and a lid is provided on the support wall so that a step is formed up and down. By providing and supporting, it is possible to easily arrange the adjacently disposed lids in the upper opening so that the ends thereof overlap one another vertically 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)
And FIG. 2 shows a storage container 1 according to the first embodiment of the present invention.
FIG. 1 is a horizontal sectional view and a side sectional view showing a storage facility 10 for storing a storage device.

1 (a) and 1 (b), a storage facility 10 is a structure roughly composed of an aboveground structure portion 11 and an underground structure portion 12. FIG. The 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 a trailer 13 enters. 15 is provided facing a container storage area 20 which is a storage room of the storage container 1 described later.

In addition, a temporary storage area 16 for temporarily storing the storage container 1a newly carried in by the trailer 13 is provided adjacent to the inspection area 15 in the above-ground structure portion 11. These inspection areas 15
Above the temporary storage area 16, an overhead crane 17 that lifts up the storage container 1 and conveys the storage container 1 in the horizontal direction as shown in FIG.

The overhead crane 17 has a structure 1
1 is a cross member 17a which is erected so as to cross over the inspection area 15 and the temporary storage area 16 near the ceiling.
And a hoist 17d for slidingly moving the storage container 1 along the horizontal member 17a. The hoist 17d is suspended by the hoist 17d so as to be movable up and down, engaged with the storage container 1 and lifted up. And a hook 17b.

The horizontal members 17a are provided on a pair of rails 10a, 10a arranged in parallel along the longitudinal direction of the storage facility 10 (the depth direction in FIG. 1B).
7c so as to be able to run freely. 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. 1A, in addition to the above-mentioned facilities, an electric distribution room 18 and a storage facility for maintenance and management of facilities are provided on the ground structure portion 11. An access control room 19 for managing persons entering and exiting the room 10 is provided.

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 for mainly radioactive materials. The container storage area 20 is configured by surrounding a space on the base portion 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 base portion 21, and the storage container 1 is placed on the concrete slab 21a.

An upper opening 2 is provided above the container storage area 20.
The upper opening 24 is closed by a plurality of concrete lids 25, 25. The lid 25 is individually and removably disposed in the upper opening 24. For example, the lid 25 is set to a thickness that can prevent the passage of radiation, or a steel plate or a lead plate is disposed inside. And has a function of shielding radiation.

Then, in order to newly bring the storage container 1a into the container storage area 20, the lid 25 where the storage container 1a is to be carried in is removed, and the hook 17b is connected to the storage container 1a.
And lift it up, and at the same time, move the hoist 17d and the horizontal member 17a 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 adjacent lids 25, and a gap is provided between these ends. It is arranged in the upper opening 24 so that S is formed. Each of these lids 25 is installed in the upper opening 24 so that the storage container 1 is disposed at 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 via the gap S. I have.

Particularly, in the present embodiment, the container storage area 2
0, a plurality of lids 25, 2 separating the inside thereof from each other.
5 are provided, and a convex portion 26a is formed on the upper portion of the support walls 26, 26, so that the adjacently disposed lids 25, 25 are stepped up and down. Provided and supported.

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

In order to remove the heat of the storage container 1 stored in the container storage area 20 by using the air supply port 30 and the air supply shaft 32, the outside air of the storage facility 10 needs to be removed as shown in FIG.
As shown by the arrow in (b), first, the air is sucked upward through the inside of the hood 30b from the inlet 30a of the hood 30b. After the outside air moves downward in the air supply shaft 32, it is supplied into the container storage area 20 through the air supply opening 32f, where the heat of the storage container 1 is removed while the container storage area 20 is removed. 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 through an exhaust gallery 31 provided above the above-ground structure portion 11.

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

The lid 25 is disposed so that its end is vertically overlapped with the end of another lid 25 disposed adjacent thereto, and the storage container 1 is disposed outside the container storage area 20. The cover 25 should be prevented from being directly viewed through the gap S.
The radiation emitted from the storage container 1 is shielded by the lid 25 so that the gap S
No radiation to the outside via

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

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

That is, as shown in FIG.
Numeral 0 is a structure roughly composed of only the above-ground structure portion 11, and similarly to the storage facility 10, the trailer 13
, An inspection area 15 and a temporary storage area 16 are provided facing the container storage area 20, and the storage container 1 as shown in FIG. In addition, an overhead crane 17 for transporting this horizontally is provided.

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

Among the shielding walls 53, those facing the inspection area include an opening / closing port 5 communicating with the internal container storage area 20.
2 are provided. The opening / closing door 52 has an opening / closing door 52a.
Is provided, through which the storage container 1 is carried into the container storage area 20.

An upper opening 24 is provided in the upper part of the container storage area 20, and this upper opening 24 is closed by a plurality of concrete lids 25,25. When the storage container 1a is newly loaded into the container storage area 20, the lid 25 at the location where the storage container 1a is loaded is placed.
Is removed, and a passage route for the overhead crane 17 is secured.

As in the first embodiment described above, the end of the lid 25 is vertically overlapped with the end of another lid 25 adjacent to the lid 25, and the gap S is provided between these ends.
Are formed in the upper opening 24 so as to be formed. 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 that the storage container 1 is not directly viewed from outside the container storage area 20 via the gap S.

Particularly, in the present embodiment, the container storage area 2
In the center of the support walls 51, 51 disposed in
A passage 54 extending from the opening / closing port 52 and extending longitudinally through the container storage area 20 is formed. Protrusions 51a, 51a are formed in the upper portions of the support walls 51, 51 so as to oppose each other with the passage 54 interposed therebetween. I support it.

In this embodiment, as in the previous embodiment, the container storage area 20 has an air supply port disposed on the side wall 11a as shown in FIGS. 3 (a) and 3 (b). From 30, an air supply shaft 32 communicating with the container storage area 20 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 material storage facility of the described invention, a plurality of concrete lids provided in the upper opening of the storage room for storing radioactive materials are vertically moved so that a gap is formed between these ends. The air whose temperature has risen due to heat removal can be exhausted from this gap. Since this gap can be disposed over a wide area above the radioactive material, the air can be efficiently exhausted over a wide area, and the heat can be uniformly removed over the entire storage room. .

The lid is disposed so that its end is vertically overlapped with the end of another lid disposed adjacent thereto, and the radioactive substance is directly viewed from outside the storage chamber through a gap. Since it is installed at a position where the lid becomes a blind spot, the radiation emitted from the radioactive material is shielded by the lid and does not radiate outside through the gap. As a result, it is possible to uniformly remove heat from the radioactive substance in the storage room while preventing radiation emitted from the radioactive substance from being radiated from the storage room to the outside.

Further, according to the radioactive material storage facility of the present invention, a support wall having a convex portion formed on the upper portion thereof is disposed in the storage room, and a lid is provided on the support wall so that a step is formed up and down. By providing and supporting the lids, the lids that are arranged adjacent to each other can be easily disposed in the upper opening such that the ends thereof are vertically overlapped 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 material storage facility according to the present invention, wherein (a) is a plan sectional view and (b) is a side sectional view.

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

FIG. 3 is an explanatory view showing a second embodiment of the radioactive material storage facility according to the present invention, wherein (a) is a plan sectional view and (b) is a side sectional view.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage container (radioactive material) 10 Storage facility 20 Container storage area (storage room) 22 Underground outer wall 24 Top opening 25 Lid S gap

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G21F 9/36 G21C 19/06

Claims (2)

(57) [Claims] 1. A storage room surrounded by a shielding wall, and a plurality of concrete lids disposed adjacent to each other and closing an upper opening of the storage room, the storage room including a spent nuclear fuel and a radioactive waste. A storage facility for radioactive material, wherein the plurality of lids are vertically overlapped with the ends of other lids disposed adjacently, and a gap is formed between these ends. The lids are provided so as to be individually detachable with upper and lower steps, and each of the lids is such that the radioactive substance is not directly viewed from outside of the storage chamber through the gap. It is installed so as to be located at the blind spot position of the body, removes the lid of the place where the radioactive material is carried in,
A radioactive material storage facility that carries radioactive material into a storage room . 2. The storage facility for a radioactive substance according to claim 1, wherein a support wall for supporting the plurality of lids is provided in the storage chamber, and an upper portion of the support wall includes: A storage facility for a radioactive substance, wherein a projection is formed to support the adjacently disposed lid body by providing a vertical step.