JPS6262315B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a storage device for a self-propelled inspection vehicle equipped with, for example, a TV camera, a thermometer, a dosimeter, and other measuring instruments installed in a containment vessel of a nuclear reactor.

Generally, the containment vessel of a nuclear reactor in a nuclear power plant includes a pressure vessel, its water supply pipe, main steam pipe, and various control equipment.
In addition, the inside of the containment vessel is kept airtight during normal operation and even after an accident occurs, as accidents involving leakage of coolant and release of radioactivity are predicted.

On the other hand, inside the containment vessel, various piping such as the water supply pipe and main steam pipe, valve equipment, and various control equipment are installed, so inspections may be necessary during normal operation or in the event of an accident. be.

However, it is predicted that the radiation dose and temperature will be high inside the containment vessel, so inspectors will enter the containment vessel and inspect for leakage of cooling water, radioactivity, temperature, atmospheric pressure, etc. That is difficult.

Therefore, an unmanned inspection device was installed inside the containment vessel and the information collected by this inspection device could be inspected externally (outside the vessel). However, the environmental conditions inside the containment vessel Even during normal operation, the temperature may rise to around 60℃.
Furthermore, in the event of an accident, the temperature may rise to approximately 170°C, and the inspection equipment itself is expected to become radioactive, so it is not desirable to leave it in the containment vessel.

In view of the above-mentioned points, the present invention provides an airtight casing in a part of the shielding wall of the containment vessel, and allows a self-propelled inspection vehicle to be freely runnable and stored on a movable rail within the airtight casing. This prevents the harmful effects of radioactivity and temperature rise in the inspection vehicle, and improves the reliability and safety of the various inspection equipment installed in the inspection vehicle.
In addition, the present invention provides a nuclear reactor inspection vehicle storage device that is intended to enable maintenance and inspection even while the reactor is in operation.

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In FIGS. 1 to 3, reference numeral 1 denotes a sealed containment vessel in a nuclear reactor. Inside this containment vessel 1, a concrete shielding body 2 having a cylindrical shape with a bottom is provided. At the upper part of the body 2 is a pressure vessel 3 equipped with fuel assemblies and control rods.
is installed. It is assumed that this pressure vessel 3 is equipped with a cooling water supply pipe, a main steam pipe, etc. (none of which are shown).

On the other hand, an airtight housing 4 is provided in a part of the shielding wall 1a of the containment vessel 1, and a pair of front and rear doors 5,
6 is hinged so that it can be opened and closed. Also, this opening/closing door 5 is always closed when another opening/closing door 6 is opened, and when this opening/closing door 6 is closed, the other opening/closing door 5 is closed.
The door is set to open. Furthermore, the entrance/exit 4 of the airtight casing 4 where each of the opening/closing doors 5, 6 is located
An outer fixed rail 7 and an inner fixed rail 8 are laid approximately horizontally on the passages a and 4b, and the ends 7a and 8a of both fixed rails 7 and 8 are connected to a movable rail 14, which will be described later. It is now temporarily connected.

On the other hand, the ceiling 4c in the storage chamber 9 of the airtight casing 4
A plurality of guide rollers 10, 11, 12 are arranged in a straight line by respective support rods 10a, 11a, 12a.
A movable rail 14 equipped with a rack 13 is provided on the rails 11 and 12 so that it can run horizontally and has a length that can be stored in the storage chamber 9 of the airtight casing 4. Also, connecting members 15 and 16, which also serve as stoppers, are provided at both ends of the movable rail 14, and the connecting member 15 is connected to the end 7a of the outer fixed rail 7, and the connecting member 16 is connected to the inner side. They are connected to the end portions 8a of the fixed rail 8, respectively. Further, a self-propelled inspection vehicle 17 is movably provided on the movable rail 14 so as to be able to sit on it, and this inspection vehicle 17 includes, for example, a TV camera, a thermometer, a dosimeter,
Contains a barometer and other measuring instruments. or,
When the movable rail 14 is selectively connected to the inner and outer fixed rails 7 and 8, the inspection vehicle 17 can run on both the fixed rails 7 and 8.

On the other hand, a pinion 18 is mounted on the support rod 11a of the guide roller 11 located on the traveling path of the rack 13, and this pinion 18 is adapted to mesh with the rack 13. Further, a drive motor 19 provided on the ceiling 4c is directly connected to the pinion 18, and the drive motor 19 rotates the pinion 18 in forward and reverse directions.

The storage chamber 9 of the airtight casing 4 is equipped with an exhaust system (not shown) to remove contaminants.

Therefore, when inspecting the inside of the containment vessel 1, please use the self-propelled inspection vehicle 1 stored in the container in advance.
7 is a movable rail 14 as shown in FIG.
The opening/closing door 6 is opened as shown by the chain line. Next, when the drive motor 19 is driven, the pinion 18, which is integrated with the output shaft of the drive motor 19, rotates.
The rack 13 that meshes with the rack 13 moves to the right in FIG.
will also be transferred. When the connecting member 16 of the movable rail 14 is joined to the end 8a of the inner fixed rail 8, the movable rail 14 and the inner fixed rail 8 are connected. While traveling along the 8th road, radioactivity, temperature, atmospheric pressure, etc. can be inspected.

Next, when storing the self-propelled inspection vehicle 17 in the storage chamber 9, the above-described operations may be performed in the reverse order.

On the other hand, when performing maintenance and inspection on the inspection vehicle 17 in the storage chamber 9, the exhaust system is activated in advance to remove the inspection vehicle 17 from the storage chamber 9.
This is done after treating the contaminants within. Furthermore,
When the inspection vehicle 17 in the storage room 9 is pulled out from the airtight housing 4 to replace parts, etc., as shown in FIG. Drive. Then, this drive motor 19
Since the pinion 18, which is integral with the output shaft of the
Moving to the left, the connecting member 15 of the movable rail 14, which is integral with this rack 13, is joined and connected to the end 7a of the outer fixed rail 7. However, the above inspection vehicle 1
7 can travel along this outer fixed rail 7 and be transferred and taken out from the airtight casing 4.

Next, the embodiment shown in FIGS. 4 to 6 is another embodiment of the present invention, and this is a movable rail 1
The movable rail 14 is connected to a plurality of inner fixed rails 8, 8 and 12, each of which supports each guide roller 11, 12 so as to be able to swing horizontally.
In other words, in this embodiment, the support rod 11a of the guide roller 11 is rotatably mounted on the support shaft 20, and further, A receiving roller 12a is provided on the support rod 12a of the guide roller 12, and this receiving roller 12b
The arc guide member 21 is vertically installed on the ceiling 4c.
It is designed to be placed on a rolling basis. Therefore,
The inspection vehicle 17 on the movable rail 14 can be selectively transferred to each inner fixed rail 8, 8', 8'', and this is substantially the same as the embodiment described above. be.

As described above, according to the present invention, the containment vessel 1
An airtight housing 4 equipped with a pair of front and rear opening/closing doors 5 and 6 is provided in a part of the shielding wall 1a, and a plurality of guide rollers 10, 11, 1 are provided in the storage chamber 9 of this airtight housing 4.
2 are arranged on a straight line, and each guide roller 10, 1
A movable rail 14 is provided so as to run horizontally along the walls 1 and 12 so as to be connected to each of the fixed rails 7 and 8 laid inside and outside the shielding wall 1a, and a self-propelled inspection system is installed on the movable rail 14. Since the vehicle 17 is provided in a movable manner, it is not only possible to prevent the inspection vehicle 17 from becoming radioactive, but also to greatly extend the life of the various measuring instruments mounted on the inspection vehicle 17. It is easy to handle, and the reliability and safety of the testing equipment can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a nuclear reactor incorporating an inspection vehicle storage device according to the present invention, FIG. 2 is a sectional view of the inspection vehicle storage device for a nuclear reactor according to the present invention, and FIG. 3 explains the operation of the present invention. Figures 4 to 6 are diagrams showing other embodiments of the present invention. 1... Containment vessel, 1a... Shielding wall, 3... Pressure vessel,
4... Airtight container, 5, 6... Opening/closing door, 7... Outer fixed rail, 8... Inner fixed rail, 9... Storage room, 10,
11, 12...Guide roller, 13...Rack, 14...
Movable rail, 17...inspection vehicle, 18...pinion, 1
9... Drive motor.

Claims (1)

[Claims] 1. An airtight casing equipped with a pair of front and rear opening/closing doors is provided in a part of the shielding wall of the containment vessel, and a plurality of guide rollers are arranged in a straight line in the storage chamber of this airtight casing. A movable rail that runs horizontally along each guide roller is connected to each fixed rail installed inside and outside the shielding wall, and a self-propelled inspection vehicle is attached to the movable rail. A nuclear reactor inspection vehicle storage device characterized by being provided with a movable vehicle. 2. The inspection vehicle storage device for a nuclear reactor as set forth in claim 1, wherein the movable rail is configured to be able to run horizontally by a transmission device using a rack and pinion. 3. Each guide roller is supported so that the movable rail can swing in the horizontal direction, and the movable rail can be selectively connected to a plurality of inner fixed rails laid in the containment vessel. An inspection vehicle storage device for a nuclear reactor according to claim 1 or 2.