JPH028674B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a method for installing, for example, a TV camera, a thermometer, a dosimeter, and other measuring instruments in a containment vessel of a nuclear reactor. Moreover, the present invention relates to a mobile inspection device for a nuclear reactor that incorporates means for transmitting a detection signal and inspects the inside of a containment vessel while moving.

(Prior Art) Generally, a pressure vessel, a water supply pipe, a main steam pipe, and various control equipment are built into a containment vessel of a nuclear reactor in a nuclear power plant.
In addition, the inside of the containment vessel is kept confidential even during normal operation and after an accident occurs, since accidents such as coolant leakage and release of radioactivity are predicted.

On the other hand, inside the containment vessel, various types of piping such as the water supply pipe and main steam pipe, various valve devices, and various control equipment are installed, so inspections are required during normal operation and in the event of an accident. There are times when you have to make sacrifices.

(Problem to be solved by the invention) However, since it is predicted that the radiation dose and temperature will be high inside the containment vessel, an inspector (operator) must enter the containment vessel to cool it down. It is difficult to inspect water leakage, radioactivity leakage, temperature, atmospheric pressure, etc.

Therefore, a method has been developed in which an unmanned quantitative inspection device is installed inside the containment vessel, and the information collected by this inspection device can be inspected externally (outside the containment vessel). The internal environmental conditions can sometimes rise to about 60 degrees Celsius even during normal operation, and can rise to about 170 degrees Celsius in the event of an accident. Furthermore, since the inspection device itself is expected to become radioactive, it is undesirable to leave it in the containment vessel.

In particular, the recirculation pump installed in the above-mentioned containment vessel, which is about 7 meters high, is located near the top of the pressure vessel. Since the lower bearing must be inspected, an inspection vehicle equipped with various inspection equipment must be moved above and below the pressure vessel. In addition, the above-mentioned inspection vehicle not only obtains detection information by running horizontally on the upper and lower two running rails installed inside the containment vessel, but also obtains detection information even when the inspection vehicle itself is being lifted and lowered using a lifting device. Otherwise, it will be difficult to quickly detect the occurrence of an accident.

In view of the above-mentioned points, the present invention not only enables the inspection vehicle to transmit and receive detection information even when the inspection vehicle is horizontally traveling and vertically moving up and down, but also enables safe detection without exposing workers as inspectors to radiation. At the same time, nuclear reactors are equipped with mobile inspection equipment to improve the reliability and safety of various inspection equipment built into inspection vehicles, and to enable maintenance inspections even during reactor operation. This is what we provide.

[Structure of the invention]

(Means for Solving the Problems) The present invention lays a traveling rail and an inspection traveling rail in two stages, upper and lower, inside a containment vessel, and vertically installs a lifting frame between the two traveling rails, A launching machine is provided on the top of this lifting frame, and a lifting trolley is installed on the hanging rope of this launching machine so as to move up and down between the above two running rails, and an axial rail is connected to this lifting trolley to both of the above running rails. An airtight casing provided with a pair of front and rear opening/closing doors is provided in a part of the shielding wall of the containment vessel to form a storage chamber, and a rack is provided on the entrance/exit passage of the airtight casing. a movable rail connected to the one running rail, a pinion that meshes with the rack is mounted on a drive motor in the storage chamber, and an inspection vehicle is provided on the movable rail provided with the rack so as to be freely movable; This allows for safe detection without exposing workers to radiation during inspection work inside the containment vessel.

(Example) Hereinafter, the present invention will be described with reference to an illustrated example.

In FIGS. 1 to 7, reference numeral 1 denotes a sealed containment vessel in a nuclear reactor, and inside this containment vessel 1, a concrete shielding body 2 having a cylindrical shape with a bottom is provided. In the upper part of this shield 2, a pressure vessel 3 equipped with a fuel assembly and control rods and a plurality of recirculation pumps 40 are 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, as shown in FIGS. 3 and 4, a part of the shielding wall 1a of the containment vessel 1 is provided with an airtight housing 4, and the front and back surfaces of this airtight housing 4 are A pair of front and rear doors 5 and 6 are screwed together so that they can be opened and closed. Further, this opening/closing door 5 is always opened when another opening/closing door 6 is opened, and when this opening/closing door 6 is closed, the other opening/closing door 5 is opened. Furthermore, each of the above-mentioned opening/closing doors 5, 6
An outer running rail 7 and an inner running rail 8 are laid approximately horizontally in a ring shape on the path of the entrances and exits 4a and 4b of the airtight casing 4, where the airtight housing 4 is located. Each end 7a, 8a
is connected and temporarily connected to a movable rail 14, which will be described later.

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 0, 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. In addition, the movable rail 1
Each connecting member 1 which also serves as a stopper is provided at both ends of 4.
5 and 16, the connecting member 15 is provided at the end 7a of the outer running rail 7, and the connecting member 16 is provided at the end 8a of the inner running rail 8.
They are arranged so that they are connected to each other. Furthermore, an inspection vehicle 17 driven by a towing machine 17a is movably provided on the movable rail 14 so that it can be driven thereon, and this inspection vehicle 17 includes, for example, a TV camera, a thermometer, a dosimeter, A barometer, a detection signal transmitting/receiving device, and other measuring instruments are incorporated. Also, the towing machine 17 of this inspection vehicle 17
When the movable rail 14 is selectively connected to the inner and outer running rails 7 and 8, the rail a can run together with the inspection vehicle 17 on both the inner and outer running rails 7 and 8.

On the other hand, a pinion 18 is attached to the support rod 11a of the guide roller 11 located on the running path of the rack 13.
is mounted on a shaft, and this panion 18 is designed 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 lower part of the containment vessel 1, the inspection vehicle 17 stored in the
As shown in FIG. 3, is mounted on the movable rail 14, and opens the opening/closing door 6 as shown by the chain line.

Next, when the drive motor 19 is driven, the pinion 18 that is integrated with the output shaft of the drive motor 19 rotates, so the rack 1 that meshes with the pinion 18 rotates.
3 indicates each guide roller 1 to the right in FIG.
0, 11, 12, and this rack 13
The movable rail 14 that is integral with the vehicle is also transported. When the connecting member 16 of the movable rail 14 is connected to the end 8a of the inner running rail 8, the movable rail 14 and the inner running rail 8 become closer together, so that the self-propelled inspection vehicle 17 While traveling along this inner traveling rail 8, 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 inside. Furthermore,
When the inspection vehicle 17 inside the storage chamber 9 is pulled out from the airtight casing 4 to replace parts, etc., the opening/closing door 5 is opened as shown in FIG. to drive. Then, this drive motor 1
Since the pinion 18 that is integrated with the output shaft of 9 rotates in the opposite direction, the rack 13 that meshes with this pinion 18 is
Moving to the right, the connecting member 15 of the movable rail 14, which is integral with this rack 13, is connected to the end 7a of the outer running rail 7. However, the above inspection vehicle 17
can be transported and taken out from the airtight casing 4 by traveling along this outer traveling rail 7.

On the other hand, in FIGS. 5 to 7, inside the containment vessel 1 at a position close to the inner end 8b of the traveling rail 8, an elevating frame 20 that also serves as a guide rail is vertically installed. A lifting cart 22 equipped with a movable rail 21 is provided within the lifting frame 20 so as to be movable up and down. That is, these constitute a lifting device I, and the lifting cart 22 has wheels 24 provided on both sides of an underframe 23.
a, 24b are fitted into the lifting frame 20, and guide rollers 25a, 25b are provided at the upper and lower parts of the underframe 23 so as to abut against the inner edges of the lifting frame 20, and the underframe The movable rail 21 is supported by an arm rod 26 fixed to a part of the rail 23 (see FIG. 6).

Further, a launching machine 27 such as a winding machine is installed on the upper part 20b of the lifting frame 20, and the lifting carriage 22 is attached to a hanging rope 27a of the launching machine 27.

Therefore, this launcher 27 is adapted to raise and lower the lifting truck 22 by means of a hanging rope 27a, and the movable rail 21 integrated with the lifting truck 22 moves the inspection vehicle 17 received from the traveling rail 8. It is designed so that it can be raised and lowered by holding the

On the other hand, above the running rail 8, a loop-shaped inspection running rail 28 is laid so as to surround the upper part of the recirculation pump 40 located outside the pressure vessel 3. A driving chain 29 is attached along the inspection traveling rail 28 near the inspection rail 28 . Further, this drive chain 29 can be rotated in forward and reverse directions by a drive device (not shown), and a part of this drive chain 29 is provided with a towing vehicle 30 that runs on the inspection travel rail 28. is consecutive 3
1. Also, this towing vehicle 30
is provided with a coupler 32, which can be connected to and detached from a hook 17b attached to the inspection vehicle 17 of the movable rail 21.

On the other hand, the inspection vehicle 17 has a built-in transmitting/receiving device as a means for transmitting detection signals, and the antenna 17c of the inspection vehicle 17 is installed outside the containment vessel 1 via a leaky coaxial cable 34, which will be described later. It is possible to send and receive data to and from a control center (control panel) 37.

Note that the inspection vehicle 17 is provided with a suspended portion 17e via a pan head 17d, and this pan head 17
d can be freely swung up and down and left and right.

On the other hand, on the movable rail 21 of the lifting device I, for example, a medium wave broadcasting power supply device 33 is provided, and this medium wave broadcasting power supply device 33 has a power supply device attached to the movable rail 21 over the length of the movable rail 21. A leaky coaxial cable 34 is connected. Further, as shown in FIG. 6, a cable 35 is connected to a part of the medium wave broadcasting power supply device 33, and the other end of the cable 35 is attached to a self-winding cable reel 366.
is wrapped in. Moreover, this cable reel 36 is connected to the control center 37 so as to be able to transmit and receive data (see FIG. 6). Furthermore, as shown in FIG. 7, a leaky coaxial cable 38 is connected to the antenna 17 on the inspection rail 28.
The part 38a of the leaky coaxial cable 38 on which the movable rail 21 is located is retracted so as not to get in the way of the movable rail 21.

Hereinafter, the effects of the present invention will be explained.

Therefore, when inspecting the upper part of the containment vessel 1, as shown in FIG. 4, when the drive motor 19 is driven, the pinion 18 of the drive motor 19 rotates. The rack 13 meshing with the rack 13 moves leftward in FIG. 4 along the guide rollers 10, 11, 12, and the movable rail 14 integral with the rack 13 is also moved horizontally. When the connecting member 16 of this movable rail 14 is connected to the end portion 8a of the traveling rail 8,
Since this movable rail 14 and the inner running rail 8 are connected, the inspection vehicle 17 equipped with a self-propelled towing machine 17a travels along the running rail 8 while the inspection vehicle 17 installed on the inspection vehicle 17 The vehicle runs while testing radioactivity, temperature, atmospheric pressure, etc. using equipment.

Next, as shown in FIGS. 5 to 7, when the inspection vehicle 17 makes one revolution on the traveling rail 8 and arrives at the other end 8b of the traveling rail 8, the inspection vehicle 17 Movable rail 2 that has been lowered in advance
1. Here, the connection between the towing machine 17a and the inspection vehicle 17 is released.

Next, as described above, when the launching machine 27 of the lifting device I is driven, the hanging rope 27a of the launching machine 27 lifts the inspection vehicle 17 that has been transferred to the movable rail 21 that is integrated with the lifting truck 22. It is pulled up to the height of the inspection traveling rail 28 and stopped.

Then, the hook 17b of the inspection vehicle 17 is connected to the coupler 32 of the towing vehicle 30, and the towing vehicle 30 is connected to the drive chain 29 via the connecting rod 31.
The above-mentioned inspection vehicle 17 moves on the inspection traveling rail 28 by
The vehicle is connected and inspected while driving.

On the other hand, although the inspection vehicle 17 is raised and lowered by the lifting cart 22 of the lifting device I, the transmitting/receiving device built into the inspection vehicle 17 is operating while the antenna 17c and the leaky coaxial cable 34
By the cooperative action with the medium wave broadcasting power supply device 3,
3. Inspection vehicle 1 to control center (control panel) 37 via cable 35 and cable reel 36
7 detection signals can be transmitted and received.

On the other hand, when the inspection vehicle 17 travels on the inspection traveling rail 28 by the towing vehicle 30, while the transmission/reception device incorporated in the inspection vehicle 17 operates,
By the cooperation of the antenna 17c and the leaky coaxial cable 38, the detection signal of the inspection vehicle 17 can be transmitted and received to the control center 37.

In this way, the inspection vehicle 17 inspects radiation, temperature, atmospheric pressure, etc. while moving vertically and horizontally, so that the inspection can be carried out safely without exposing workers to radiation.

Next, in order to return the inspection vehicle 17 to the traveling rail 8, the above-mentioned operations may be performed in order.

In addition, the above-mentioned lifting device I has both running rails 8 and 28.
Although we have explained a specific example in which one unit is installed between the
You are free to set up a stand. It goes without saying that the traveling rail 8 is also provided with a leaky coaxial cable.

〔Effect of the invention〕

As described above, according to the present invention, a traveling rail and an inspection traveling rail are laid in two stages, upper and lower, in a containment vessel, and a lifting frame is vertically installed between these traveling rails, and A launcher is provided on the upper part of the frame, an elevating trolley is attached to the hanging rope of the launcher so as to move up and down between the two traveling rails, and a movable rail is provided to the elevating trolley so as to be connected to both of the traveling rails. An airtight casing having a pair of front and rear opening/closing doors is provided in a part of the shielding wall of the containment vessel to form a storage chamber, and a movable rail equipped with a rack is provided on the entrance/exit passage of this airtight casing. A pinion that meshes with the rack is mounted on the drive motor in the storage chamber, and an inspection vehicle is installed on the movable rail equipped with the rack so as to be freely movable. Since the measuring equipment and the transmitting/receiving device for these detection signals are provided to transmit/receive to the control center outside the containment vessel, detection information can be constantly transmitted/received even when the inspection vehicle 17 is moving horizontally or vertically moving up and down. In addition, since the inspection vehicle 17 can be stored in the storage chamber when not in use, the inside of the storage container is not exposed to activation, and has excellent effects such as safe detection during inspection.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view diagrammatically showing a mobile inspection device for a nuclear reactor according to the present invention, FIG. 2 is a cross-sectional view of the same, and FIG. 3 is an enlarged view of a storage device for an inspection vehicle incorporated in the present invention. 4 is a diagram for explaining the operation of the inspection vehicle in FIG. 3, FIG. 5 is a front view showing only the essential parts of the present invention, FIG. 6 is a side view of the same, and FIG. is a plan view of the same as above. 1...Containment container, 4...Airtight housing, 8...Traveling rail, 17...Inspection vehicle, 17c...Antenna,
20... Lifting frame, 21... Movable rail,
22... Elevating platform, 27... Launch machine, 28... Inspection traveling rail, 29... Drive chain, 30...
Towing vehicle, 31... connecting rod, 32... coupler, 33...
... Medium wave broadcast power supply device, 34 ... Leaky coaxial cable, 35 ... Cable, 36 ... Cable reel, 37 ... Control center.

Claims (1)

[Claims] 1. Lay a traveling rail and an inspection traveling rail in two stages (upper and lower) inside the containment vessel, install a lifting frame vertically between these running rails, install a launcher on top of this lifting frame, and An elevating trolley is provided on the suspension rope of the launch machine so as to be raised and lowered between the two traveling rails, a movable rail is provided on the elevating trolley so as to be connected to both of the traveling rails, and a portion of the shielding wall of the containment vessel is provided. An airtight casing having a pair of front and rear opening/closing doors is provided to form a storage chamber, and a movable rail with a rack is connected to one of the running rails on the entrance/exit passage of the airtight casing. A pinion that meshes with the rack is mounted on the drive motor in the storage chamber, an inspection vehicle is installed on a movable rail equipped with the rack so as to be freely movable, and the inspection vehicle is equipped with measuring instruments and a transmitting/receiving device for these detection signals. A mobile inspection device for a nuclear reactor, characterized in that the device is configured to transmit and receive information to a control center outside the containment vessel.