JP2000009890A - Canister transporting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely shield the dispersion of radiation from a canister in the entire operation process by providing upper and lower shielding bodies for shielding radiation between the upper and lower parts of the canister and between a lid and a bottom plate. SOLUTION: For example, when a cask 1 accommodating a canister 30 is to be carried into a storage location by a trailer, the cask 1 is tentatively installed on a stand, a lid 5 is removed along with an upper buffer body 10, a suspension tool being connected to a crane is suspended at a suspension part 16 of a lid 15 of a protection cylinder 19, at the same time, the suspension tool is hooked also to a trunnion 6 of the cask 1. The cask 1 and the canister 30 are suspended by a suspension tool, and at the same time, a bottom plate 9 of the cask 1 is removed and is carried to a storage location where an accommodation pipe exists by the crane and the suspension tool. On transportation, the canister 30 is accommodated in the protection cylinder 19 and at the same time an upper side is shielded by an upper shielding body 13 and a lower shielding body 14. Also, since the canister 30 can be inserted into the accommodation pipe at the accommodation location while the bottom plate of a transportation container is removed, thus easily inserting the canister 30 by its gravity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a canister in which spent fuel is stored in a transport container in a sealed state.
The present invention relates to a device for transporting a canister to a predetermined storage location.

[0002]

2. Description of the Related Art In a nuclear power plant, when a fuel assembly used in a nuclear reactor is stored in a fuel storage facility, a canister containing the fuel assembly is placed in a transport container or a canister provided with radiation shielding means. It is stored, sealed, mounted on a vehicle such as a trailer, transported, and stored in a predetermined fuel storage facility.

FIG. 4 is a longitudinal sectional view showing an example of such a conventional cask for transporting canisters, FIG. 5 is a sectional view taken along the line AA of FIG. 4, and FIG. 6 is a canister in a fuel storage facility. It is a perspective view which shows the storage situation of.

[0004] In FIG. 4, reference numeral 30 denotes a cylindrical canister having a bottom, as shown in FIG. 5, in which a plurality of cells 31 for accommodating a fuel assembly (not shown) are accommodated. Reference numeral 32 denotes a lid for covering the upper portion of the canister 30, which is detachably attached to the canister 30 by a plurality of bolts. Reference numeral 20 denotes a cask, which is configured as follows. Reference numeral 21 denotes an inner cylinder of the cask 20, in which the canister 30 is housed on the inner periphery, a bottom plate 24 is integrally formed at a bottom portion, and a flange portion 21a is integrally formed at an upper portion.

[0005] Reference numeral 25 denotes a lid for covering the upper part of the inner cylinder 21, which is provided with a hanging trunnion (not shown), and is detachably attached to the inner cylinder 21 by a plurality of bolts. Reference numeral 22 denotes a cylindrical intermediate cylinder fixed to the outside of the inner cylinder 21, and a gamma ray shielding body 26 for blocking γ rays is provided between the inner periphery of the intermediate cylinder 22 and the outer periphery of the inner cylinder 21. Is filled.
Reference numeral 23 denotes a cylindrical outer cylinder, which is fixedly disposed outside the intermediate cylinder 22, and has an inner periphery of the outer cylinder 23 and the intermediate cylinder 2.
A neutron shield 27 for blocking neutrons is filled between the neutron shield 2 and the outer periphery of the neutron.

Reference numeral 28 denotes an upper cushion attached to the upper surface of the lid 25 so as to cover the same, and reference numeral 29 denotes a lower buffer attached to the bottom plate 24 so as to cover the same. 29 is made of a material having cushioning and damping properties against impact.

FIG. 3 is a perspective view of a fuel storage facility for storing the canister 30 stored and transported in the cask 20. In FIG. 3, a trailer 35 carrying the cask 20 and transporting the cask 20 lowers the cask 20 to a predetermined position in a building 36. And the cask 20
The canister 30 taken out by opening the lid 25 is stored in the transfer container 37, lifted by the crane 38, and stored in the storage tube 39.

FIG. 6 is a system diagram showing a procedure from transportation of the canister 30 to storage in the fuel storage facility. Hereinafter, the procedure will be described with reference to FIGS.

(A) The trailer 35 carries the cask 20 containing the canister 30 into a storage location (fuel storage facility).

(B) The cask 20 is temporarily placed on the table 51.

(C) Remove the lid 25 of the cask 20,
The transfer container 37 is opened and its shielding door 40 is opened to open the cask 2.
0, and the canister 30 is lifted by the lifting device 52 and suspended in the transfer container 37.
Is closed.

(D) The transfer container 37 is lifted by the hanging tool 52 and transported to the storage location where the storage tube 39 is located.

(E) The transfer container 37 is placed on the storage tube 39, the shielding door 40 is opened, and the canister 30 is moved to the storage tube 39.
Store in.

(F) The transfer container 37 is withdrawn and the storage tube 39 is removed.
Is covered with a shielding cover 41.

FIG. 7 is a sectional view showing an example of the transfer container 37. As shown in FIG. 50 is a cylindrical shielding body,
As in the case of 0, a gamma ray (γ ray) shield and a neutron shield are provided. Reference numeral 40 denotes a shielding door provided at the lower part of the shielding body 50 so that the opening thereof can be opened and closed. The opening and closing operation is performed by an air cylinder 42 provided between the shielding door and the shielding body 50.

[0016]

When the canister 30 is transported using the cask 20 according to the prior art shown in FIG. 4 and is transferred to the transfer container 37 and stored in the storage tube 39, FIG. ~ (E), as shown in FIG.
While the canister 30 is taken out of the container and stored in the transfer container 37, the canister 30 is exposed without radiation blocking in the vertical direction. For this reason, this conventional technique has a problem that radiation is radiated from the canister 30 to the outside during transportation and storage operations.

In view of the above-mentioned problems of the prior art, the present invention is provided with a transport container which can reliably shield radiation from radiating from the canister in all work steps from transport of the canister to storage in the fuel storage facility. An object of the present invention is to provide a canister transport device.

[0018]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a closed canister in which a spent fuel is accommodated in a transport container and a predetermined storage canister. In the canister transport device adapted to be transported to a place, the transport container includes a cylindrical body that shields radiation, and a lid and a bottom plate that cover the cylindrical body at upper and lower portions, respectively, and that are detachably attached to the cylindrical body. And an upper shield and a lower shield for shielding radiation are provided between the upper and lower portions of the canister and the lid and the bottom plate, respectively. .

According to a second aspect of the present invention, in the first aspect, the canister is housed in a bottomed cylindrical protection cylinder, the upper shield is provided above the canister, and the canister inside the protection cylinder is provided. The lower shielding body is provided between the bottom of the protection cylinder and the bottom surface of the protection cylinder.
The canister is housed in a container including an upper shield, a lower shield, and a lid to form a sealed unit.

According to the invention, when the canister is transported, the canister is stored in a transport container, transported to a storage location of the fuel storage facility by transport means such as a tractor, temporarily placed on a table, and transported. Remove the bottom plate of the container.

Then, the canister and the transport container are lifted up with the upper shield and the lower shield attached by the hanging tool, transported to the storage place, and placed on the storage pipe for the canister in the storage place. Then, when the hanging member is loosened, since the bottom plate is removed as described above, the integrated body of the canister, the upper shield, and the lower shield is stored in the storage pipe by its weight.

At the time of such transportation and storage, the canister is shielded from the outside by the upper shield and the lower shield. Therefore, even when the canister is removed by removing the bottom plate of the transport container, radiation of radiation from the canister is not affected. It is surely blocked. Further, since the canister is inserted into the storage pipe at the storage location with the bottom plate of the transport container removed, the canister can be easily inserted by its gravity.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 is a longitudinal sectional view of a canister transport cask according to an embodiment of the present invention, and FIG. 2 is a system diagram showing a procedure from transport of the canister to storage in a fuel storage facility.

In FIG. 1, reference numeral 30 denotes a cylindrical canister having a bottom. As shown in FIG. 5, a plurality of cells 31 accommodating a fuel assembly (not shown) are accommodated therein.

Reference numeral 1 denotes a cask, which is configured as follows. Reference numeral 2 denotes an inner cylinder, and a flange portion 2a is integrally formed at an upper portion, and a plurality of trunnions 6 are fixed to the flange portion 2a along the circumferential direction.

Reference numeral 5 denotes a lid for covering the upper part of the inner cylinder 2, which is detachably attached to the inner cylinder 2 by a plurality of bolts.
Reference numeral 3 denotes a cylindrical intermediate cylinder fixed to the outside of the inner cylinder 2,
A gamma ray shield 7 for blocking gamma rays is filled between the inner circumference of the intermediate cylinder 3 and the outer circumference of the inner cylinder 2. 4
Is a cylindrical outer cylinder fixedly disposed outside the intermediate cylinder 3, and a neutron between the inner periphery of the outer cylinder 4 and the outer periphery of the intermediate cylinder 3 for blocking neutrons. The shield 8 is filled.

Reference numeral 9 denotes a bottom plate which is detachably attached to the lower part of the inner cylinder 2 by bolts (not shown). Reference numeral 10 denotes an upper cushion attached to the upper surface of the lid 5 so as to cover the same, and reference numeral 11 denotes a lower buffer attached to the bottom plate 9 so as to cover the same. It is made of a material having cushioning and damping properties.

Reference numeral 19 denotes a thin cylindrical protection tube provided so as to cover the outside of the canister 30. Inside the protection tube 19, an upper shield 13 is provided above the canister 30, and A lower shielding body 14 is provided below the lower surface of the canister 30 to block radiation of radiation from the canister 30 to the outside. Reference numeral 15 denotes a lid fixed to the upper part of the protective tube 19, and the upper shield 13 is provided inside the lid 15. Reference numeral 16 denotes a suspension fixed to the upper surface of the lid 15.

When transporting the canister 30 stored in the cask 1 having such a configuration, as shown in FIG. 3, the cask 1 is mounted and the transported trailer 35 moves the cask 1 in a building 36 to a predetermined position. To the position. Then, the canister 30 taken out by opening the lid 5 of the cask 1 is lifted by the crane 38,
It is stored in the storage tube 39.

Next, a procedure from transport of the canister 30 using the cask 1 of this embodiment shown in FIG. 1 to storage in the fuel storage facility will be described with reference to FIG.

(A) The trailer 35 carries the cask 1 in which the canister 30 is stored into a storage location (fuel storage facility).

(B) The cask 1 is temporarily placed on the table 51, the lid 5 is removed together with the upper buffer 10,
A hanging member 52 connected to a crane (not shown) is hung on the hanging portion 16 of the lid 15, and the hanger 52 is also hung on the trunnion 6 of the cask 1.

(C) The cask 1 and the canister 30 are lifted by the suspender 52 and
Bottom plate 9 is removed, and a crane (not shown)
By 2, it is transported to the storage location where the storage tube 39 is located.

(D) The Cask 1 and Canister 30
Is placed on the storage tube 39.

(E) When the hanging member 52 is loosened, the cask 1
Since the bottom plate 9 is removed, the canister 30 is stored in the storage tube 39 by its gravity while being covered by the thin protective tube 19 with the lid 15, the upper shield 13 and the lower shield 14. . At this point, the hanging tool 52 is released.

(F) The cask 1 is lifted by the hanging tool 52 and withdrawn, and the storage tube 39 is covered with the shielding cover 41.

At the time of such transportation and storage, the canister 30 is housed in the protective cylinder 19, and the upper side is shielded by the upper shield 13 and the lower side is shielded by the lower shield 14, so that the radiation from the canister 30 is reduced. Divergence is reliably prevented.

[0039]

As described above, according to the present invention, when the canister is transported and stored in the fuel storage facility, the canister is shielded from the outside by the upper shield and the lower shield. Radiation from the canister can be reliably prevented in all states from transport to storage of the canister.

Further, since the canister can be inserted into the storage tube of the storage place with the bottom plate of the transport container removed, the canister can be easily inserted by its gravity, and the transfer container and canister of the prior art can be easily inserted. Since the transfer to the transfer container is not required, the workability is improved and the transportation cost is reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a canister transport cask according to an embodiment of the present invention.

FIG. 2 is a system diagram showing a procedure for transporting and storing a canister in the embodiment.

FIG. 3 is a perspective view of a canister storage location.

FIG. 4 is a view corresponding to FIG. 1 showing a cask according to the related art.

FIG. 5 is a sectional view taken along line AA in FIG. 1 and FIG. 4 (only the canister is shown).

FIG. 6 is a diagram corresponding to FIG. 2, showing a canister transporting and storing means in the prior art.

FIG. 7 is a cross-sectional view of a transfer container according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cask 2 Inner cylinder 3 Intermediate cylinder 4 Outer cylinder 5 Lid 7 Gamma ray shield 8 Neutron shield 9 Bottom plate 10 Upper buffer 11 Lower buffer 13 Upper shield 14 Lower shield 16 Suspension 19 Protection cylinder 30 Canister 31 Cell 39 Storage tube 52 Hanging tool

Claims (2)

[Claims] 1. A canister transport device in which a sealed cylindrical canister containing spent fuel is stored in a transport container and transported to a predetermined storage location, wherein the transport container shields radiation. And a lid and a bottom plate that cover the cylinder body at the upper and lower portions, respectively, and that are detachably attached to the cylinder body, between the upper and lower portions of the canister and the lid and the bottom plate. A canister transport device comprising an upper shield and a lower shield for blocking radiation. 2. The canister is housed in a bottomed cylindrical protection cylinder, the upper shield is provided above the canister, and the bottom of the canister and the bottom of the protection cylinder inside the protection cylinder are provided. The lower shield is provided therebetween, and the protective cylinder is covered with a lid at a position above the upper shield, and the canister is placed in a container including the protective cylinder, the upper shield, the lower shield, and the lid. 2. The canister transport device according to claim 1, wherein the canister is housed in a sealed unit.