JPH0525998Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a ship for transporting radioactive cargo such as radioactive waste and spent nuclear fuel.

[Conventional technology]

Traditionally, spent nuclear fuel produced at nuclear power plants is stored in casks and transported by ship to reprocessing facilities (factories).

It is also planned that radioactive waste generated at nuclear power plants will be sealed in drums or concrete blocks and transported by ship to storage areas.

When transporting such radioactive cargo by sea, various developments have been made in the hull structure and rigging to protect ship crew members from radiation exposure. Ya, the fourth
In addition to the ships shown in Figures a, b, and c, the ships shown in Figure 5 and the ships shown in Figures 6 a, b, and c have been proposed. Note that the symbols in FIGS. 3 to 6 indicate the following.

101: Hull 102: Cargo hold compartment 103: Accommodation compartment 104: Engine compartment 105: Hatch coaming 106: Shield tank between cargo hold compartment and engine compartment 107: Shield tank between cargo hold compartment and front 108: Cargo hold compartment and Shielding tank between the rear part 109: Shielding tank between the cargo hold compartment and the upper part (removable type) 110: Shielding tank between the cargo hold compartment and the upper part (fixed to the hull) 111: Hatch cover 112: Cask for transporting radioactive materials 113: Living compartment Protective Shielding Wall [Problems to be Solved by the Invention] By the way, when the previously proposed fixed shielding wall as described above is applied to a ship, there are the following problems.

(1) A fixed shielding wall will be installed in front of the residential area, resulting in poor visibility.

(2) Since the shielding wall is installed on the upper part of the hull, the center of gravity of the hull is raised, making the ship unstable in terms of stability, and a particular problem is the deterioration of stability during the voyage.

In order to solve these problems, during normal voyages, a cargo hold lid is constructed of a shielding material such as concrete or heavy wood (for example, "Permari"), which prevents the air from emitting from the cargo hold during cargo handling. Regarding radiation, it is possible to reduce the exposure dose in residential areas.

The present invention was created from this point of view, and when the hatch cover is opened, it protects the living area by covering it with the hatch cover, and it also protects the living area from deterioration of visibility and damage to the hull due to fixed shielding walls. The purpose of the present invention is to provide a radioactive cargo carrier that can improve stability caused by a rise in the center of gravity.

[Means for solving problems]

For this reason, the radioactive cargo carrier of the present invention has a living quarters in the upper structure on the upper deck of the ship, and has a hatch formed on the upper deck near the upper structure and a hatch that can be opened and closed. The hatch cover has a radiation shielding structure, and a hatch cover upright holding mechanism is provided for raising the hatch cover so as to cover a living area of the upper structure when the hatch is opened. It is characterized by the fact that it was established.

[Effect]

In the above-mentioned radioactive cargo carrier of the present invention, the hatch cover having a radiation shielding structure is raised by the discipline maintenance mechanism so as to cover the accommodation area in the hull superstructure when the hatch is opened for cargo handling. and is maintained in its upright position.

〔Example〕

Hereinafter, a radioactive cargo carrier as an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view of the main parts thereof, and FIG. 2 is a front view of the main parts.

As shown in FIGS. 1 and 2, a living area is provided in the upper structure 12 erected on the upper deck 11 of the hull.
A hatch cover 1 is attached to a hatch 13 formed in 1 so as to be openable and closable.

A hatch cover 1 having a radiation shielding structure is held upright in front of the accommodation area in the hull superstructure 12 when the hatch 13 is opened, and 1' indicates the hatch cover is in the middle of movement; ″ indicates the closed state of the hatch cover.
The hatch cover 1 is raised up by a winch 7 and a wire rope 6, which constitute a hatch cover upright holding mechanism, and the rope 6 is guided by pulleys 3 and 5.

A roller 2 is provided at the end of the hatch cover 1, so that the hatch cover 1 can be easily moved.

The ramp way 4 is set at a height that allows a worker to pass under the hatch cover 1, and after the hatch cover 1 is erected, the anti-rolling device 9 is loaded.

The hatch cover 1 may have the same width as the hatchway, but in the illustrated example, the width is the same as the width of the ship, so that the living area of the superstructure 12 is completely protected, and the hatch cover 1 in the upright state is Superstructure 1
It is designed to be supported by a receiving part 8 attached to the front surface of the holder 2.

In addition, the part outside the hatch cover width,
It may also be foldable.

Protection of living quarters in the superstructure 12 from radiation is achieved by the closed hatch cover 1'' and the shielding material 10 provided on the upper deck 11 during voyage, and by the hatch cover 1 in the upright position during cargo handling.
and the shielding material 10.

Note that the hatch cover 1 may be configured with two sheets.

As mentioned above, in this radioactive cargo carrier, during the voyage, the hatch cover 1, which has a radiation shielding structure, is closed and shields the radioactive cargo in the hold. This does not cause a decrease in stability.

Furthermore, when the ship is stopped for cargo handling, the living area of the upper structure 12 is covered by the raised hatch cover 1 having a radiation shielding structure, so that heavy crew members can be sufficiently protected from radiation exposure.

[Effects of the Invention] As detailed above, the radioactive cargo carrier of the present invention provides the following effects or advantages.

(1) During the voyage, the hatch cover, which has a radiation shielding structure, is closed and shields the radioactive cargo in the hold, so there will be no deterioration of forward visibility or a decrease in stability due to a rise in the ship's center of gravity. .

(2) When the ship is stopped for cargo handling, the living quarters of the superstructure are covered by the raised hatch cover, which has a radiation shielding structure, so the crew can be sufficiently protected from radiation exposure.

[Brief explanation of the drawing]

Figures 1 and 2 show a radioactive cargo carrier as an embodiment of the present invention. Figure 1 is a vertical sectional view of the main parts, Figure 2 is a front view of the main parts, and Figure 3 is a front view of the main parts.
Figures a, b, and c show a radioactive cargo carrier as an example of a conventional ship. Figure 3 a is a longitudinal cross-sectional view of its main parts, Figures 3 b and c are both cross-sectional views, and Figure 3 b and c are both cross-sectional views. Figures 4a, b, and c show another conventional example of a radioactive cargo carrier; Figure 4a is a longitudinal cross-sectional view of the ship, Figure 4b is a longitudinal cross-sectional view showing its main parts in detail, Figure 4c is a cross-sectional view of the ship, Figure 5 is a longitudinal cross-sectional view showing the main parts of another conventional radioactive cargo carrier, and Figures 6a, b, and c are further conventional radioactive cargo carriers. Another example of a cargo carrier is shown in which FIG. 6a is a longitudinal sectional view, FIG. 6b is a horizontal sectional view, and FIG. 6c is a cross-sectional view. 1, 1', 1''...hatch cover having a radiation shielding structure, 2...roller, 3...pulley, 4...rampway, 5...pulley, 6...rope, 7...
Winch, 8... Receiving part, 9... Anti-rolling, 10
...shielding material, 11 ... upper deck, 12 ... superstructure, 13 ... storehouse.

Claims (1)

[Scope of utility model registration request] A living quarter is provided in the upper structure on the upper deck of the ship, and the hatch cover is provided with a hatch formed in the upper deck adjacent to the upper structure, and a hatch cover attached to the hatch so as to be openable and closable. has a radiation shielding structure, and is provided with a hatch cover upright holding mechanism for raising the hatch cover so that it covers the living area of the upper structure when the hatch is opened, Cargo carrier.