JP2002006088A - Radioactive material storage facility and loader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce construction cost and improve workability in moving radioactive material in a radioactive material storage facility by improving a ceiling crane and a loader of which the motion directions are crossing, lowering the building height and better arranging a cask depository area and a storage area. SOLUTION: By arranging a trailer area 6, the cask depository area 8 and the storage area 2 in line, the loader 20 is made possible to run in all area. The loader itself is made able to lift a radioactive material-containing cask 11 and to contain the radioactive material in the cask in containing tubes in the storage area as loading the cask in the loader. As the results, conventional cask accepting room and ceiling crane become unnecessary and moving and handling of radioactive materials in the facility are facilitated with a single loader of this invention.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive material storage facility and a loading machine, and more particularly to a storage facility and a loading machine which are suitable for handling, moving, and storing radioactive materials and have low construction costs.

[0002]

2. Description of the Related Art Conventionally, a building for storing radioactive materials is equipped with both overhead crane and loading equipment as described in Japanese Patent Application Laid-Open No. 6-148382.

[0003] In the above-mentioned building, it was necessary to take the following procedure for storing radioactive materials.

[0004] A trailer that has transported a cask containing radioactive materials is made to enter the trailer area.
The radioactive substance is contained in a canister, and several canisters are contained in one cask. The cask has a total length of 5 m, and one cask is carried by one trailer.

In a trailer area, a cask is lifted using an overhead crane.

The suspended cask is moved to a cask receiving room by an overhead crane as it is.

In the cask receiving room, the canister housed in the cask is taken out by the overhead crane in the cask receiving room and moved to the canister preparation area.

[0008] The canister is loaded on the loading machine by the loading machine.

[0009] The loading machine loaded with the canister is moved to the storage area, and the canister is stored in the storage pipe in the storage area.

Conventionally, in order to transport radioactive materials, an existing cask such as TN-12 was used and operated without increasing the cost as much as possible. Those casks are
The total length was about 5 m or more, and handling was very difficult. For this reason, it was very difficult to carry out lifting by the loading machine shown in the above-mentioned known example.

[0011] For these reasons, two overhead cranes,
Since one loading machine is required and the building needs to be set so that the overhead crane and the loading machine do not interfere,
The building height had to be increased.

[0012]

According to the above prior art, in a building for storing radioactive materials, the height of the storage building required for storing the radioactive materials is generally the required height of the storage area ( The required height for safe storage during storage) + The required height of the loading machine (the height of the loading machine itself and the extra height during traveling, etc.) + The required height of the overhead crane (the height of the overhead crane itself) And height required for installation, running, etc.) + mat thickness + height required to insert cask when loading.

Therefore, it is necessary to install an overhead crane for lifting a cask having a considerable mass, and the construction cost is expected to increase due to an increase in the height of the building.

In order to store a radioactive substance in a storage area, it is necessary to follow the above procedure.
Two overhead cranes and one loading machine were required.

(1) Loading and unloading and transporting the cask between the trailer and the cask receiving chamber by one overhead crane.

(2) Removal and transport of the canister between the cask receiving chamber and the canister preparation area by the other overhead crane.

(3) The canister is loaded in the loading machine, moved between the canister preparation area and the storage area, and stored in the storage pipe of the storage area.

The above procedure must be performed because the cask is large and the mass of the cask itself is large. The fact that the cask is large and large means that the loading and unloading of the cask by the loading machine and the storage of the radioactive material in the storage tube could not be performed.

An object of the present invention is to solve the above-described problems under the following circumstances.
Abolished conventional overhead cranes to provide a loader that can handle and store radioactive materials, improve work efficiency, provide low-cost construction, and provide a radioactive material storage facility that can safely store radioactive materials. It is to be.

[0020]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention stores radioactive materials in a storage pipe in a storage area without using a conventionally used overhead crane and an overhead overhead crane in a cask receiving room. A radioactive material storage facility that can do this was created.

For this purpose, a cask storage area for storing a cask, a trailer area for carrying in and out a radioactive substance into and out of a storage facility, and a storage area for storing a radioactive substance are arranged in series, whereby three areas are arranged in series. The loading machine can run on the upper part of the area.

Lifting the cask containing the radioactive material into the loading machine and placing it at a predetermined position in the machine, and further transporting the radioactive material to a storage area for storing the radioactive material, or transporting the radioactive material to the cask storage area; Further, a loading machine capable of storing the radioactive material in the cask in the storage pipe of the storage area and then transporting the cask to the cask storage area or the trailer area has been devised.

As described above, the radioactive material stored in the cask is stored on the storage cell in the storage area for storing the radioactive material in a state where the cask storing the radioactive material is installed at a predetermined position in the loading machine. It has become possible to store the canisters in each storage pipe in the storage area while maintaining the radioactive material shielding performance and containment performance.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show a radioactive substance storage facility according to the present invention. 6 and 7 show a loading machine according to the present invention.

First, an example of the radioactive substance storage facility according to the present invention will be described. FIG. 1 is a plan view of a level at which a loading machine travels in the radioactive substance storage facility of the present embodiment. FIG. 2 is a plan view of a storage level lower than the loading machine traveling level of FIG. 3 to 5 show an AA section, a BB section, and a CC section of FIG. 2, respectively.

As shown in these figures, the radioactive substance storage facility 1 is roughly divided into the following three areas. That is, a trailer area 6 for loading / unloading the cask 11 containing the radioactive material, a cask storage area 8 for temporarily storing the cask 11 irrespective of the storage of the radioactive material, and an object for storing the radioactive material. Storage area 2 to be stored.

In order to prevent the temperature in the storage room from exceeding the required temperature, an air supply port 9 for taking in outside air and an exhaust port 10 for discharging the outside air taken in for cooling from the storage room are provided. Provided, and other storage facilities 1
An auxiliary equipment room 13, a staircase room 12, and the like necessary for operation and management of the building are provided as needed.

The storage area 2 is provided with a floor mat 24 for supporting the weight of a plurality of storage tubes 14 for storing radioactive materials, and a floor slab 16 for fixing the shielding plugs 15 and the storage tubes 14, and a loading device. It has a ceiling slab 17 of the traveling room of the machine 20 and the like.

One of the features of the present invention is that the trailer area 6, the cask storage area 8, and the radioactive material storage area 2 are arranged in series so that the loading machine 20 can run straight. With such an arrangement, the conventional overhead crane is omitted.

Conventionally, it was possible for a loading machine for transporting a cask to a radioactive substance storage area to travel to the upper part of a cask receiving chamber for taking out a canister from the cask. If a storage area for storing radioactive materials is provided, about 9
It had to be provided at a position maintaining the angle of 0 degrees.

That is, when handling a radioactive substance by the procedure (-) described in the prior art, it is necessary to arrange a storage area and a cask storage area in series as in the present invention and install an overhead crane. This is because the width of the overhead crane is increased, and it is obvious that construction costs are higher than in the conventional case where an angle of about 90 degrees is provided.

In order to reduce the construction cost by arranging the cask storage area and the cask receiving area and moving the cask between them by an overhead crane, the radioactive material storage area and the cask storage area must be about 90 degrees. It is desirable to set the position at an angle.

However, for that purpose, the overhead crane installed between the cask receiving area and the cask storage area intersects with the loading machine traveling path running between the cask receiving area and the storage area. Ceilings had to be raised, resulting in high construction costs. In addition, there is a problem that site conditions and the like are disadvantageous in such a facility arrangement.

Therefore, according to the present invention, the three areas of the trailer area 6, the radioactive material storage area 2, and the cask storage area 8 for loading and unloading the cask are arranged in series along the straight traveling path of the loading machine that travels straight. By doing so, all the transport of radioactive materials in the facility was carried out by the loading machine, and the overhead crane which was conventionally required can be omitted.

For this purpose, in the present invention, as shown in FIGS. 6 and 7, the loading machine and the cask are provided with various functions. First, the cask 11 was set in the loading machine 20 so that it could be transported.

A function of exchanging a canister 18 containing radioactive material between the cask 11 in the loading machine 20 and the storage pipe 14 in the storage area 2 is provided. In addition, the cask 11 itself has been made compact to facilitate handling.

That is, the cask 11 can be freely transported between the three areas of the trailer area 2, the cask storage area 8, and the storage area 2 by only the loading machine 20.

For example, the canister 18 is taken out of the cask 11 installed in the loading machine 20 and is loaded at a predetermined position, and the shielding plug 15 of the storage tube 14 is opened to open the canister 1.
8 can be stored in the storage tube 14 and vice versa.

The transfer of the canister 18 between the loading machine 20 and the storage tube 14 is performed, for example, by stopping the loading machine so that the cask 11 in the loading machine is on the shielding plug 15, and connecting the bottom plate of the cask to the shielding plug. It is also possible to open the lid and move the canister.

Further, by improving the conventional large cask and making it compact, the cask with the canister stored therein can be unloaded between the trailer and the loading machine as it is, and the direct connection between the trailer area and the storage area can be achieved. It can be easily transported between the spaces.

Therefore, not only can the transport operation be facilitated, but also the radioactive substance storage canister can only be taken in and out of the storage pipe in the storage area. Therefore, as in the conventional case, the canister in the cask is taken out and loaded. The canister preparation area to be loaded on the vehicle can be eliminated.

Hereinafter, embodiments of the present invention will be described more specifically.

The loading machine 20 according to the present invention comprises a storage facility 1 for storing radioactive materials, a cask 11 being lifted and installed at a predetermined position in the loading machine 20, and a trailer area 6 and a storage area arranged in series. 2. Reciprocating between the three cask storage areas 8 and storing the radioactive material in the storage tube 14 of the storage area 2, and then transporting the empty cask to the cask storage area 8 or the trailer area 6.

Then, with the cask 11 installed at a predetermined position in the loading machine 20, the storage cells 3 of the storage area 2 are stored.
Canister 18 housed in cask 11 above
Can be stored in each storage pipe 14 in the storage area 2 while maintaining the shielding performance and the confinement performance of the radioactive material, or can be taken into the cask in the loading machine 20 from the storage pipe 14 on the contrary. did.

With such a function, by using the loading machine according to the present invention, conventional operations such as taking out the canister from the cask and transferring it to the loading machine can be omitted, and the storage area, the cask storage area, and the trailer area can be omitted. And can be seen in series.

By using the loading machine according to the present invention, it is possible to efficiently handle a radioactive substance, that is, a canister containing a radioactive substance and a cask containing the canister, in a specific procedure described below. Can be.

First, a case where a radioactive substance is stored in a cask and the radioactive substance is stored in a storage area will be described.

(1) The trailer 7 that has transported the cask 11 in which the radioactive substance storage canister 18 is stored is made to enter the trailer area 6.

(2) In the trailer area 6, the cask 11 is set at a predetermined position in the loading machine 20 by the loading machine 20 according to the present invention.

(3) The loading machine 20 is moved to the storage area 2 with the cask 11 installed inside the machine.

(4) The loading machine 20 is fixed at a position where the canister 18 can be stored in the storage pipe 14 of the storage area 2.

(5) The canister 18 in the cask 11 is loaded on the loading machine 20 in the loading machine 20.

(6) Canister 1 loaded on loading machine 20
8 are stored in the respective storage tubes 14 of the storage area 2.

(7) The cask 11 from which the radioactive substance storage canister 18 has been taken out is moved onto the cask storage area 8 by the loading machine 20 as it is.

(8) Loading Machine 2 on Cask Storage Area 8
0, the cask 11 is stored at a predetermined position in the cask storage area 8. In some cases, the vehicle may be loaded on the trailer 7 in the trailer area 6 and carried out of the storage facility 1.

When the radioactive material is taken out of the storage tube in the storage area and carried out of the storage facility, the radioactive material in the facility is taken out of the facility by taking the reverse of the above procedure. Can be.

Next, the procedure for carrying the cask 11 containing the radioactive substance containing canister 18 into the storage facility 1 by the trailer 7 and transporting it from the trailer area 6 to the cask storage area 8 for storage will be described.

(1) The trailer 7 transporting the cask 11 containing the radioactive substance containing canister 18 is
The trailer area 6 is entered.

(2) In the trailer area 6, the cask 11 is set at a predetermined position in the loading machine 20 by the loading machine 20 according to the present invention.

(3) The loading machine 20 is stored in the cask storage area 8
Move up.

(4) The cask 11 is stored at a predetermined position in the cask storage area 8 by the loading machine 20.

When the radioactive substance storage canister 18 is moved from the cask storage area 8 to the storage area 2 and the canister 18 is stored in the storage pipe 14, as described above,
The cask 11 is transported to the storage area 2 by the loading machine 20, and the cask 11 is transported directly from the trailer to the storage area to store the canister in a similar manner.

Therefore, according to the radioactive substance storage facility and the loading machine according to the present invention, the radioactive substance can be transported and stored without using the following necessary equipment.

Conventionally, an overhead crane required for lifting a cask.

[0066] The lid of the cask was removed, and the canister filled with the radioactive material stored in the cask was
Overhead crane in the cask receiving room for transporting to the canister preparation area.

Similarly, by using the present invention, the cask receiving room and the canister preparation area, which are conventionally required, become unnecessary, and the radioactive material storage facility can be effectively used.

Further, since it is no longer necessary to use an overhead crane, the height of the storage facility itself can be reduced for the following reasons, which can contribute to a reduction in construction costs.

According to the prior art, considering safety,
The height of the storage facility was determined by integrating the following contents. That is, the required height of the storage area (the height required for safe storage at the time of storage) + the required height of the loading machine (the height of the loading machine itself and the extra height at the time of traveling, etc.) +
It was determined by the required height of the overhead crane (the height of the overhead crane itself and the required height for installation and running, etc.) + the mat thickness.

However, the height of the storage facility 1 according to the present invention is approximately the required height of the storage area 2 (the height required for safe storage during storage) + the required height of the loading machine 20 (the loading machine). 20 itself height and extra height during running)
+ Since it is determined by the thickness of the mat 24, there is an excellent effect that the height of the building can be made lower than that of a conventional radioactive substance storage facility.

Next, the loading machine 20 according to the present invention will be described.
Cask 11 from trailer area or cask storage area
Is stored until the radioactive substance (canister 18) is stored in the storage area 2.

(1) The loading machine 20 is fixed in the trailer area 6 or the cask storage area 8.

(2) The shielding shutter 25 of the loading machine 20 which is normally closed is opened, and the cask 11 is lifted.

(3) The suspended cask 11 is set at a predetermined position in the loading machine 20.

(4) The shielding shutter 25 is closed.

(5) The loading machine 20 is moved to the storage area 2 and the loading machine 20 is fixed at the installation position of each storage tube 14.

(6) Lower lid (bottom plate) of the cask 11
Remove.

(7) The normally closed shielding shutter 25 of the loading machine 20 is opened.

(8) Withdraw the shielding plug 15 installed on the upper part of the storage tube 14 and temporarily store it in the loading machine 20.

(9) The canister 18 containing the radioactive substance is suspended in the storage tube 14.

(10) The shielding plug 15 temporarily stored in the loading machine 20 is attached to the storage tube.

(11) Shielding shutter 2 of loading machine 20
Close 5.

(12) Close the lower lid of the cask 11.

(13) The loading machine 20 is moved to the trailer area 6 or the cask storage area 8 and fixed.

(14) Shielding shutter 2 of loading machine 20
5 is opened and the cask 11 is hung down.

The loading machine 20 according to the present invention has a shielding function, so that even when the shielding plug 15 attached to the upper part of the storage tube 14 is removed, it is possible to work safely without affecting the outside. Is possible. Further, the storage pipe 14 of the storage area 2 has such a height that canisters canisters in which several radioactive substances are stored can be stacked and stored.

The storage facility 1 of the present invention will be described in more detail. FIG. 1 shows a vertical installation system in which the longitudinal direction of the cask 11 is perpendicular to the ground. It is also possible to store it in a horizontal position parallel to the ground. When the cask 11 is stored, the cask 11 is fixed by a cask fixing base 26 or the like so that the cask 11 can be safely stored even in the event of an earthquake or the like.

In the storage area 2, when the loading machine 20 is set to the storage area 2 at the end of the storage facility 1, the loading machine 20 is in a protruding state. If the wall is extended to the mat 24 in this state, an empty space is formed between the storage cell 3 and the mat 24, which leads to an increase in the mat 24. Therefore, the loading machine 20 is not affected without affecting the operation range of the loading machine 20. The overhanging structure portion capable of storing the 20 is provided only in a portion where the loading machine 20 travels.

In this way, by using the overhanging structure at the end of the building where the loading machine runs, it is possible to reduce the amount of the mat 24 corresponding to the size of the overhanging structure.
This also applies to the end of the building on the cask storage area 8 side.

This structure is very effective at the time of extension.
In particular, on the storage area side, the storage cells can be easily added by equalizing the storage cells and standardizing the walls and floor members. At the time of expansion, in order to expand storage cells, which are severe radiation control areas, without affecting the outside, expansion is possible by removing only the outer wall of the area where the loading machine runs above the storage cells.

This also applies to the end of the building on the cask storage area side, and can be expanded by removing only the outer wall at the end of the cask storage area for expansion.

As described above, according to the embodiment of the loading machine according to the present invention, it is possible to freely move between the radioactive material storage area and the cask storage area and store the radioactive material. Facilities can be provided.

Further, according to the present invention, it is possible to reduce the number of overhead cranes and overhead cranes in the cask receiving room in a radioactive material storage facility that required a conventional overhead crane and a loading machine. Further, according to the present invention, the cask receiving room, which has been conventionally required, becomes unnecessary, can be deleted, and the storage facility can be used more effectively.

Furthermore, the building height of the conventional radioactive material storage facility is the required height of the storage area (height required for safe storage during storage) + the required height of the loading machine (height of the loading machine itself). The height of the overhead crane (the height of the overhead crane itself and the required height for installation, traveling, etc.) + The thickness of the mat.

The height of the building is substantially equal to the required height of the storage area (height required for safe storage at the time of storage) + the required height of the loading machine (loading) due to the elimination of the overhead crane according to the present invention. The height of the machine itself and the extra height during traveling) are determined by the thickness of the mat, so that the height of the building can be reduced and the construction cost can be reduced.

In addition, it becomes possible to handle the radioactive material in the radioactive material storage facility using only the loading machine,
Easy handling. By installing a cask with shielding function inside the loading machine and storing the radioactive material in the storage tube, it is possible to reduce the shielding performance compared to the conventional loading machine, and reduce the cost related to shielding the loading machine It becomes possible to do.

[0097]

As described above, according to the present invention, in a radioactive material storage facility, the conventional overhead crane can be abolished, the building height can be reduced, and the construction cost can be reduced. In addition, the loading machine for transporting the radioactive material is rationalized, whereby the handling of the radioactive material is facilitated and the working efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a radioactive material storage facility according to an embodiment of the present invention as viewed from a loading machine traveling level.

FIG. 2 is a plan view from the level below the ceiling of the storage room of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view taken along line CC of FIG. 2;

FIG. 6 is a longitudinal sectional view showing a state of the loading machine according to the embodiment of the present invention when the cask is lifted.

FIG. 7 is a vertical cross-sectional view showing a state in which the canister of the embodiment of the loading machine according to the present invention is suspended.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radioactive substance storage facility 2 Storage area 3 Storage cell 4 Loading machine rail 5 Shield 6 Trailer area 7 Trailer 8 Cask storage area 9 Air supply port 10 Exhaust port 11 Cask 12 Staircase room 13 Ancillary equipment room 14 Storage pipe 15 Shield plug 16 Floor slab 17 Ceiling slab 18 Canister 20 Loading machine 24 Mat 25 Shielding shutter 26 Cask fixing stand

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiko Tanabe 3-1-1, Sachimachi, Hitachi City, Ibaraki Prefecture Within the Nuclear Power Division, Hitachi, Ltd. No. 2 Inside Hitachi Life Co., Ltd. (72) Inventor Jin Shimizu 3-1-1 Sachimachi, Hitachi City, Ibaraki Prefecture Inside Nuclear Power Division, Hitachi, Ltd. (72) Tadahiro Hoshikawa Inventor Tadahiro Hoshikawa Ibaraki Prefecture Chome 1-1 Nuclear Power Division, Hitachi, Ltd.

Claims (5)

[Claims] At least three areas: a trailer area into which a cask containing a radioactive substance is carried in and out, a cask storage area to temporarily store the cask, and a storage area to store the radioactive substance, A radioactive material storage facility that is arranged in series along the straight path of a loading machine that loads radioactive materials. 2. The radioactive substance storage facility according to claim 1, wherein the loading machine has a structure capable of lifting and transporting the cask. 3. The storage area according to claim 1, wherein the storage area is provided with a supply port for taking in outside air for cooling the radioactive substance, and an exhaust port for discharging outside air after cooling the radioactive substance. Radioactive material storage facility as described. 4. The radioactive material storage facility according to claim 1, 2 or 3, which travels along the three areas, lifts the cask onboard, and removes the radioactive material in the cask. Loading machine to store in storage tube in storage area. 5. A lifting means for lifting a cask containing radioactive materials, an installation means for installing the cask at a predetermined position in the machine, and a moving means for installing the cask and moving along a travel path. Loading means for loading the radioactive substance storage canister in the cask, performance maintaining means for maintaining the shielding performance and confinement performance of the radioactive substance, and storage means for storing the loaded canister in a storage pipe of a storage area. Loading machine to have.