JPH11287897A - Facility for transporting radioactive waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a facility for transporting radioactive wastes where a simple structure permits radiation shielding in the carrying in and out of waste housing canisters. SOLUTION: When a transportation cart 8 moves toward one end (A) of a transportation passage 4, a part near the upper end of a shield container 6 goes into the inside of the first fixed shield 21. On this occasion, a mobile shield 20 moves toward the other end (B) of the shield container 6 and closes the opening 23 of the first fixed shield 21. When the transportation cart 8 moves toward the other end (B) of the transportation passage 4, moreover, a part near the upper end of the shield container 6 goes into the inside of the second fixed shield 22. At the time, the mobile shield 20 moves toward one end (A) of the shield container 6 and closes the opening 24 of the second fixed shield 22. Consequently, radiation is shielded when waste housing canisters (G) are carried in and out of the shield container 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive waste transport facility.

[0002]

2. Description of the Related Art A vitrification process is performed on a radioactive waste liquid generated by reprocessing of spent fuel used in a nuclear reactor, and a vitrified body formed by the vitrification process is stored in a radioactive waste storage facility. It is planned to be.

FIG. 10 to FIG. 12 show a radioactive waste transporting facility proposed to be used for transporting a vitrified material or the like. The radioactive waste transporting facility is a waste in a building 1 of a radioactive waste storage facility. It has a tunnel-shaped transport passage 4 extending substantially horizontally below the waste storage chamber 3 from below the receiving chamber 2, and an openable and closable cover 5 at the upper end, and a waste storage body (vitrified body) inside. The vehicle includes a shielding container 6 in which G can be housed, and a transport trolley 8 on which the shielding container 6 is mounted and which can travel on a rail 7 laid in the transport passage 4.

[0004] A portion of the shielding container 6 near the lower end is provided with a transport carriage 8.
Projecting further downward, and between the left and right rails 7,
A pit 9 extending in the same direction as the rail 7 is formed so that the movement of the shielding container 6 accompanying the traveling of the transport cart 8 is allowed.

A slab 10 that separates the waste receiving chamber 2 and the waste storage chamber 3 from the transport passage 4 has a first unloading penetrating from the waste receiving chamber 2 to one end of the transport passage 4 substantially vertically. An entrance 11 and a second carrying-in / out opening 12 which penetrates from the waste storage room 3 to the other end of the transport passage 4 substantially vertically are formed in the waste receiving room 2 and the waste storage room 3 respectively. The waste container G is exchanged between the shielded container 6 and the waste receiving room 2 and the waste storage room 3 by the crane (not shown).

On the top of the shielding container 6, a frame-like elevating member is formed to cover a portion near the upper end of the shielding container 6 from both sides of the transport path and four sides on both sides of the transport path 4 in plan view. The shield 13 is provided so that it can be moved up and down by an actuator (not shown).

When the waste container G is inserted from the waste receiving chamber 2 into the shielding container 6 or when the waste container G is sent from the shielding container 6 to the waste storage room 3, the lifting shield 1
3 is raised to a shielding position where the upper surface of the shield is in surface contact with the ceiling portion (the lower surface of the slab 10) of the transport passage 4, and radiation from the waste container G is passed through the gap between the shield container 6 and the ceiling portion of the transport passage 4. Is prevented from being discharged to the transport path 4 via the

When the transport carriage 8 is run, the elevating shield 13 is lowered to a non-shielding position where the upper surface of the shield is separated from the ceiling of the transport passage 4, and the upper surface of the shield and the ceiling of the transport passage 4 are moved downward. Release contact with.

FIGS. 13 and 14 show another example of a radioactive waste transporting facility proposed to be used for transporting a vitrified material or the like, in which the same reference numerals as in FIGS. 10 to 12 are used. Parts represent the same thing.

In this radioactive waste transport facility, the first fixed shield 14 and the second fixed shield are replaced with the lifting shield 13 (see FIGS. 10 to 12) provided above the shielding container 6. 15 is fixed to the ceiling portion of the transport passage 4, and the first movable shield 16 and the second fixed shield 15 that are movable adjacent to the first fixed shield 14 in the direction crossing the transport passage 4. A second movable shield 17 that is adjacently movable in a direction crossing the transport path 4 is attached to a ceiling portion of the transport path 4.

The first fixed shield 14 provided on the ceiling portion on one end A side of the transport passage 4 has a portion near the other end B side of the shielding container 6 with the travel of the transport vehicle 8 when viewed in plan. It has an opening 18 through which the upper end can pass, and when the shielding container 6 moves directly below the first loading / unloading port 11, the portion near the upper end of the shielding container 6 is moved in three directions, one end A side of the transport passage 4 and both sides of the passage. It is formed in a substantially concave shape that can be covered from the outside.

A second fixed shield 15 provided on the ceiling portion on the other end B side of the transport passage 4 has a shield container 6 near the one end A side as the transport trolley 8 travels in a plan view. It has an opening 19 through which the upper end can pass, and when the shielding container 6 moves directly below the second loading / unloading port 12, the portion near the upper end of the shielding container 6 is moved to the other end B side of the transport passage 4 and both sides of the passage. It is formed in a substantially concave shape that can be covered from three sides.

The first movable shield 16 adjacent to the other end B side of the transport passage 4 of the first fixed shield 14 is opened by the actuator (not shown).
8 is closed or the upper end of the shielding container 6 can pass through the opening 18.

The second movable shield 17 adjacent to one end A of the transport passage 4 of the second fixed shield 15 is opened by the actuator (not shown).
9 is closed or the upper end of the shielding container 6 can pass through the opening 19.

When the waste container G is inserted into the shielding container 6 from the waste receiving chamber 2 or when the waste container G is sent out from the shielding container 6 to the waste storage room 3, the transport trolley 8 is run. Then, after the upper end portion of the shielding container 6 is positioned inside the first fixed shielding member 14 or the second fixed shielding member 15, the openings 18, 19 of these fixed shielding members 14, 15 are placed.
The first movable shield 16 or the second movable shield 17 is moved to a closed position where the shield is closed, and the other end face of the shielding container 6 or the portion near the upper end of one end face is moved.
To prevent the radiation from the waste container G from being released to the transport passage 4 through the gap between the shielding container 6 and the ceiling of the transport passage 4 and the openings 18 and 19.

When the transport carriage 8 is run, the first movable shield 16 or the second movable shield 1
7 is moved to the open position on the side of the transport passage 4 so that the portion near the upper end of the shielding container 6 can pass through the openings 18 and 19 of the fixed shielding members 14 and 15.

[0017]

However, FIG.
In the radioactive waste transport equipment shown in FIG. 12, an elevating shield 13 surrounding a portion near the upper end of the shielding container 6 in a circumferential direction and an actuator as an elevating means thereof are provided on a shielding container 6 mounted on a transport cart 8. Since it is provided, the structure of the moving unit including the transporting cart 8 and the shielding container 6 becomes complicated.

In the radioactive waste transport equipment shown in FIGS. 13 and 14, a space for retracting the movable shields 16 and 17 and the movable shield 1 when the transport cart 8 travels are provided.
Since the moving means 6 and 17 are provided on the side of the transport passage 4, the frame structure of the building 1 including the transport passage 4 becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a radioactive waste transport facility capable of shielding radiation with a simple structure when a waste container is taken in and out.

[0020]

In order to achieve the above object, according to the present invention, a first carry-in / out port extending upward at one end of the ceiling is formed and a second inlet / outlet extending upward at the other end of the ceiling is provided.
A tunnel-like transport passage in which a carry-in / out entrance is formed, a shielding container having an openable and closable lid at an upper end portion, and a waste container inside the container, and a transport passage mounted with the shielding container. In a radioactive waste transporting facility equipped with a transportable carriage, the shield has a first opening near the other end of the transport passage through which the upper end of the shielding container can pass as the transporting vehicle travels. A first fixed shield capable of covering a portion near the upper end of the shielding container from one end side of the transfer passage and three sides on both sides of the transfer passage when moving to a position directly below the carry-in / out port is provided at a ceiling portion at one end of the transfer passage. An opening through which the upper end of the shielding container can pass along the traveling path is provided at a portion near one end of the transport passage, and when the shielding container is moved immediately below the second loading / unloading port, the opening near the upper end of the shielding container is moved to the other end of the transport passage. Can be covered from three sides: on the side and on both sides of the transport path A second fixed shield is provided at a ceiling portion at the other end of the transfer passage, an opening of the first fixed shield can be closed from the other end of the transfer passage, and an opening of the second fixed shield is connected to one end of the transfer passage. A movable shield that can be closed from the side is provided on the upper part of the shielding container so as to be movable in the transporting vehicle traveling direction.

In the radioactive waste transport equipment of the present invention, when the transport vehicle moves toward one end of the transport passage, when the portion near the upper end of the shield container enters the inside of the first fixed shield, the movable shield is moved. When the carrier moves toward the other end of the shielding container and closes the opening of the first fixed shield, and when the transport trolley moves to the other end side of the transport passage, the portion closer to the upper end of the shielding container becomes the second fixed shield. When moving inward, the movable shield moves toward one end of the shield container to close the opening of the second fixed shield.

[0022]

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

FIGS. 1 to 9 show an embodiment of the radioactive waste transport equipment according to the present invention, in which FIGS.
The portions denoted by the same reference numerals as 4 represent the same items.

In this radioactive waste transport facility, the first fixed shield 21 and the second fixed shield 22 are fixed to the ceiling of the transport passage 4 and the movable shield 20 is placed above the shield container 6 in the transport passage. It is mounted so that it can move in the direction.

The first fixed shield 21 provided on the ceiling portion on one end A side of the transport passage 4 has a portion near the other end B side of the shielding container 6 with the travel of the transport cart 8 when viewed in plan. When the shielding container 6 has an opening 23 through which the upper end can pass, and the shielding container 6 is located immediately below the first loading / unloading opening 11, the portion near the upper end of the shielding container 6 is moved in three directions, one end A side of the transport passage 4 and both sides of the passage. It is formed in a substantially concave shape that can be covered from the outside.

When viewed in plan, the second fixed shield 22 provided on the ceiling portion on the other end B side of the transport passage 4 is provided at the portion closer to the one end A side with the travel of the transport cart 8 to the shielding container 6. When the shielding container 6 has an opening 24 through which the upper end can pass, and the shielding container 6 is located immediately below the second carry-in / out port 12, the portion near the upper end of the shielding container 6 is connected to the other end B side of the transport passage 4 and both sides of the passage. It is formed in a substantially concave shape that can be covered from three sides.

The distance L 1 from the inner closed ends of the fixed shields 21 and 22 to immediately before the opening formation portion is formed to be equal to or slightly longer than the outer dimension in the longitudinal direction of the transport path at the portion near the upper end of the shielding container 6. (See FIG. 2).

The inner width W1 other than the openings of the fixed shields 21 and 22 is formed to be equal to or slightly wider than the outer dimension of the shielding container 6 near the upper end in the conveying passage width direction.
The inner width W2 of the openings 23 and 24 is wider than the above inner width W1 (see FIG. 2).

The movable shield 20 includes a shield 25 extending in the width direction of the transport passage along the upper surface of the shield container 6 and the shield 2.
5 and supporting portions 26 projecting downward along both side surfaces of the shielding container 6 (see FIG. 9).

At the lower end of the support portion 26, a roller 28 that can roll along a guide member 27 provided on both sides of the shielding container 6 and extending substantially horizontally in the longitudinal direction of the transport path is pivotally supported. The roller 28 allows the movable shield 20 to move relatively to the one end A side or the other end B side of the transport path 4 with respect to the shielding container 6.

The outer dimension of the movable shield 20 in the width direction of the transport passage is equal to or slightly smaller than the inner width W2 of the openings 23 and 24 of the fixed shields 21 and 22.

Further, stoppers 29 for regulating the displacement of the movable shield 20 are provided at the front and rear ends of the upper part of the shield container 6.

In the radioactive waste transport facility having the above-described configuration, when the movable shield 20 is in contact with the stopper 29 on the other end B side of the shielding container 6 (see FIGS. 1 and 2), the transport is performed. When the carriage 8 traveling to the other end B side of the passage 4 approaches the second fixed shield 22, the second fixed shield 22
The movable shield 20 is fitted into the opening 24 of the movable shield 2.
0 is prevented from moving to the other end B side of the transport path 4 and the opening 2
4 is closed (see FIGS. 5 and 6).

Since the movable shield 20 can move relative to the shield container 6 as previously extended, even after the opening 24 is closed by the movable shield 20, the transport carriage 8 and the shield container can be moved. 6 can move toward the other end B of the transport path 4.

Further, when the transport carriage 8 moves toward the other end B of the transport path 4, the portion near the upper end of the shielding container 6 is moved to the second position.
, And is covered with the second fixed shield 22 from the other end B side of the transport passage 4 and three sides on both sides of the passage, and finally, the movable shield 20 is It comes into contact with the stopper 29 on one end A side of the shielding container 6 (see FIGS. 7 and 8).

Thus, the shielding container 6 and the waste storage room 3
Transfer of the waste container G between the
No radiation is emitted.

The above-described operation is achieved by moving the carriage 8 toward one end A of the transfer passage 4 after the upper end portion of the shield container 6 is positioned inside the second fixed shield 22. Similarly to the above, the movable shield 20 is fitted into the opening of the first fixed shield 21, the movement of the movable shield 20 toward the one end A of the transport path 4 is suppressed, and the opening 23 is closed.

Further, when the transporting carriage 8 moves toward one end A of the transporting passage 4, the portion near the upper end of the shielding container 6 becomes the first
, And is covered with the first fixed shield 21 from one end A side of the transport passage 4 and three sides on both sides of the passage.

Thus, the waste receiving chamber 2 and the shielding container 6
Transfer of the waste container G between the
No radiation is emitted.

As described above, in the radioactive waste transport equipment shown in FIGS. 1 to 9, when the transport trolley 8 moves toward the one end A of the transport passage 4, the portion near the upper end of the shielding container 6 becomes the first.
When moving into the inside of the fixed shield 21, the movable shield 2
0 moves closer to the other end B side of the shielding container 6 to close the opening 23 of the first fixed shield 21, and when the transport carriage 8 moves to the other end B side of the transport passage 4, the shielding container 6 When the portion near the upper end of the cover enters the inside of the second fixed shield 22, the movable shield 20 moves toward the one end A side of the shield container 6 to close the opening 24 of the second fixed shield 22. Therefore, the radiation shielding when the waste container G is taken in and out of the shielding container 6 can be performed without providing a driving unit for the movable shielding member 20.

The radioactive waste transport equipment according to the present invention comprises:
It is needless to say that the present invention is not limited to the above-described embodiment, but may be modified without departing from the spirit of the present invention.

[0042]

As described above, in the radioactive waste transport equipment of the present invention, the portion near the upper end of the shielding container is the first.
When entering the inside of the fixed shield, the movable shield moves toward the other end of the shielding container to close the opening of the first fixed shield, and the portion near the upper end of the shielding container is the second. When entering the inside of the fixed shield, the movable shield moves toward one end of the shield container and closes the opening of the second fixed shield. An excellent effect that radiation shielding can be performed when a waste container is taken in and out of the container.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a state in which a transport cart is located at an intermediate portion of a transport path in an example of an embodiment of a radioactive waste transport facility of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 1;

FIG. 5 is a conceptual diagram showing a state in which a movable shield is fitted into an opening of a second fixed shield in an example of the embodiment of the radioactive waste transport equipment of the present invention.

FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 5;

FIG. 7 is a conceptual diagram showing a state in which a portion near the upper end of the shielding container has entered a second fixed shield in an example of the embodiment of the radioactive waste transport equipment of the present invention.

FIG. 8 is a view taken in the direction of arrows VIII-VIII in FIG. 7;

FIG. 9 is a perspective view of a movable shield in one example of the embodiment of the radioactive waste transport equipment of the present invention.

FIG. 10 is a conceptual diagram showing a state in which a transport trolley is located at an intermediate portion of a transport path in an example of a radioactive waste transport facility recently proposed.

FIG. 11 is a view as viewed in the direction of arrows XI-XI in FIG. 10;

FIG. 12 is a conceptual diagram showing a state in which a transport vehicle is located near one end of a transport path in an example of a radioactive waste transport facility recently proposed.

FIG. 13 is a conceptual diagram showing a state in which a transport trolley is located at an intermediate portion of a transport path in another example of a radioactive waste transport facility recently proposed.

FIG. 14 is a view taken in the direction of arrows XIV-XIV in FIG. 13;

[Explanation of symbols]

 Reference Signs List 4 transport passage 5 shielding lid 6 shielding container 8 transport cart 11 first carrying-in / out 12 second carrying-in / out 20 moving shield 21 first fixed shield 22 second fixed shield 23 opening 24 opening G waste storage body

Claims (1)

[Claims] 1. A tunnel-like transport passage having a first carry-in / out port extending upward at one end ceiling portion and a second carry-in / out port extending upward at the other end ceiling portion, and an upper end portion capable of opening and closing. In a radioactive waste transport facility comprising a shielding container having a simple shielding lid and capable of housing a waste storage body therein, and a transport vehicle carrying the shielding container and capable of traveling in a transport path, An opening through which the upper end of the shielding container can pass along the traveling path is provided at a portion near the other end of the transport passage, and when the shielding container is moved directly below the first loading / unloading port, the opening near the upper end of the shielding container is connected to one end of the transport passage. A first fixed shield that can be covered from three sides of the side of the transfer passage and a side of the transfer passage is provided at a ceiling portion at one end of the transfer passage, and an opening through which an upper end portion of the shielding container can pass as the transfer trolley travels is shifted toward one end of the transfer passage. Part and the shielding container is the second unloading A second fixed shield capable of covering a portion near the upper end of the shielding container from the other end of the transfer passage and three sides on both sides of the transfer passage when moved to just below the entrance is provided on a ceiling portion at the other end of the transfer passage. A movable shield capable of closing the opening of the fixed shield from the other end of the transport passage and closing the opening of the second fixed shield from the one end of the transport passage is provided on the upper part of the shielding container in the traveling direction of the transport trolley. Radioactive waste transport equipment characterized by being provided movably.