JPH0141958B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is directed to a nuclear reactor containment vessel equipped with, for example, a TV camera, a thermometer, a dosimeter, and other measuring instruments. The present invention relates to a moving point detection device.

(Prior Art) Generally, the containment vessel of a nuclear reactor in a nuclear power plant includes a pressure vessel, its water intake pipe, main steam pipe, and various control equipment.
In addition, the inside of the containment vessel is kept airtight even during normal operation and after an accident occurs, as leakage accidents 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 devices, and various control equipment are installed, so even during normal operation or in the event of an accident,
Sometimes inspections are necessary.

(Problem to be solved by the invention) However, since it is predicted that the radiation dose and temperature are increasing inside the containment vessel,
It is difficult for inspectors to enter the containment vessel and inspect the leakage of cooling water, radioactivity, temperature, atmospheric pressure, etc. Therefore, an unmanned stationary inspection device was installed inside the containment vessel. Although a device has been developed that allows the information collected by this inspection device to be inspected externally (externally), the environmental conditions inside the containment vessel can sometimes rise to around 60 degrees Celsius even during normal operation. Furthermore, in the event of an accident, the temperature may rise to approximately 170℃, and the inspection equipment itself is expected to become radioactive, so it is not advisable to leave it in the containment vessel. Undesirable.

In view of the above-mentioned points, the present invention inspects the recirculation pump etc. installed on the upper part of the outside of the pressure vessel, prevents the harmful effects of radioactivity and temperature rise of the inspection vehicle, and performs various inspections built into the inspection vehicle. The present invention provides a mobile inspection device for a nuclear reactor, which aims to improve the reliability and safety of equipment, and also allows maintenance and inspection to be performed even while the reactor is in operation.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides an airtight casing provided with an opening/closing door in a part of the shielding wall of the containment vessel, and a running rail that leads into the airtight casing is connected to the containment vessel. A lifting frame that also serves as a guide rail is installed in a position close to the inner end of this running rail,
An elevating cart equipped with a movable rail is provided on the elevating frame so that it can be raised and lowered, a hoisting machine is installed on the upper part of the elevating frame, and the elevating cart is raised and lowered by a hanging rope of the hoisting machine. A movable rail is provided so as to receive and place an inspection vehicle running on the above-mentioned running rail, a loop-shaped inspection running rail is laid above the above-mentioned running rail, and an inspection vehicle is installed in the vicinity of this inspection running rail. A drive chain is attached to the drive chain, a towing vehicle equipped with a coupler is provided on the drive chain so as to run on the inspection rail, and the inspection vehicle is coupled to the coupler; The inspection vehicle can be transferred from the traveling rail to the inspection traveling rail using an elevating cart.

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

In FIGS. 1 to 6, reference numeral 1 denotes a sealed containment vessel in a nuclear reactor. Inside this containment vessel 1, a concrete shield 2 having a cylindrical shape with a bottom is provided. A pressure vessel 3 equipped with a fuel assembly and control rods is installed in the upper part of the shield 2. In addition, this pressure vessel 3
It is assumed that a cooling water supply pipe, a main steam pipe, etc. (none of which are shown) are installed.

On the other hand, a part of the shielding wall 1a of the containment vessel 1 is provided with an airtight housing 4, and on the front and back sides of the airtight housing 4, a pair of front and rear opening/closing doors 5, 6 can be opened and closed. It is screwed on. Moreover, this opening/closing door 5 is always closed when another opening/closing door 6 is opened, and when the 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
On the passages a and 4b, an outer running rail 7 and an inner running rail 8 are laid approximately horizontally,
Ends 7a and 8a of both running rails 7 and 8 are arranged in series 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 connected to the end 7a of the outer running rail 7, and the connecting member 16 is connected to the end 8a of the inner running rail 8, respectively. There is. 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, Contains a barometer and other measuring instruments. Also, this inspection vehicle 1
7 is configured such that when the movable rail 14 is selectively connected to the inner and outer running rails 7 and 8, it can run 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 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 lower part of the containment vessel 1, it is necessary to use the upper inspection vehicle 17 stored therein in advance.
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.
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 running rail 8, the movable rail 14 and the inner running rail 8 are connected, so that the self-propelled inspection vehicle 17 While traveling along the 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 within. 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, the pinion 18, which is integrated with the output shaft of the drive motor 19, rotates in the opposite direction.
The rack 13 that meshes with this pinion 18 moves to the left, and the movable rail 1 that is integrated with this rack 13 moves to the left.
The connecting member 15 of No. 4 is connected to the end portion 7a of the outer traveling rail 7.
It joins and connects. 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 and 6, a lifting frame 20 that also serves as a guide rail is vertically installed at a position close to the inner end 8b of the traveling rail 8. Inside 20, an elevating cart 22 equipped with a movable rail 21 is provided so as to be movable up and down. That is, this elevating cart 22
24a and 2 provided on both sides of the underframe 23.
4b into the lifting frame 20, and each guide roller 25 is installed above and below the underframe 23.
a, 25b are provided so as to abut on the inner ends of the lifting frame 20, and the movable rule 21 is supported by the arm rod 16 fixed to a part of the underframe 23. (See Figure 6). Further, a hoisting machine 27 such as a hoisting machine is installed on the upper part 20a of the lifting frame 20, and this hoisting machine 27
The lifting trolley 22 is connected to the hanging rope 27A.

Therefore, the hoisting machine 27 and the lifting truck 22 are raised and lowered by a hanging rope 27a, and the movable rail 21 integrated with the lifting truck 22 is connected to the inspection truck received from the traveling rail 8. 17 so that it can be raised and lowered.

On the other hand, above the traveling rail 8, an inspection traveling rail 28 forming a loop is connected to the pressure vessel 3.
For example, a drive chain 29 is installed along the inspection rail 28 in the vicinity of the inspection rail 28. ing. 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 equipped with a towing vehicle 30 that runs on the inspection rail 28. are connected via a connecting rod 31. The towing vehicle 30 is also provided with a coupler 32, which can be connected to and detached from a hook 17b attached to the inspection vehicle 17 on the movable rail 21.

Therefore, when inspecting the upper part of the containment vessel 1, the inspection vehicle 17 is moved by the towing machine 17a to the inner end of the running rail 8, as shown in FIGS. At the end of 8a, it is transferred to the lowered movable rail 21 in advance. Here, the connection between the towing machine 17a and the inspection vehicle 17 is released. Next, as described above, when the hoisting machine 27 is driven, the hanging rope 27a of the hoisting machine 27 is suspended from the inspection car 17 on the movable rail 21 that is integrated with the lifting cart 22.
is pulled up to the height of the inspection running rail 28 and stopped. Then, hook 1 of this inspection vehicle 17
7b is connected to a coupler 32 of the towing vehicle 30, and the towing vehicle 30 connects the inspection vehicle 17 to the inspection traveling rail 28 by a drive chain 29 via a connecting rod 31. . The inspection vehicle 17 is adapted to inspect radioactivity, temperature, atmospheric pressure, etc. while traveling.

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

〔Effect of the invention〕

As described above, according to the present invention, the containment vessel 1
An airtight casing 4 having opening and closing doors 5 and 6 is provided in a part of the shielding wall 1a, and a running rail 8 communicating with the inside of the airtight casing 4 is provided in the containment vessel 1,
An elevating frame 20 that also serves as a guide rail is installed in a position close to the inner end of the traveling rail 8a, and an elevating cart 22 equipped with a movable rail 21 is provided on the elevating frame 20 so as to be able to rise and fall freely. A hoisting machine 27 is installed on the upper part 20a of the frame 20a, and the hoisting machine 27 is provided with a hanging rope 27a to raise and lower the lifting cart, and the movable rail 2
1 is provided to receive and place an inspection vehicle 17 running on the running rail 8, and an inspection running rail 28 forming a loop above the running rail 8.
A driving chain 29 is attached near the inspection running rail 28, and a towing vehicle 30 equipped with a coupler 31 on the driving chain 29 is made to run on the inspection running rail 28. The inspection vehicle 17 is connected to the coupler 31, and the inspection vehicle 17 can be transferred from the traveling rail 8 to the inspection traveling rail 28 by the lifting cart 22. Not only can the entire interior of the inspection vehicle 17 be thoroughly inspected, but it is also easy to handle unattended. Moreover, it is possible to prevent the inspection vehicle 17 itself from becoming radioactive, and it also extends the lifespan of the various measuring instruments mounted on the inspection vehicle 17. It has excellent effects such as being able to extend the period considerably.

[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 cross-sectional view 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, and FIG. 6 is a side view of the same. 1...Containment container, 4...Airtight casing, 8...Traveling rail, 17...Inspection vehicle, 20...Elevating frame, 21...Movable rail, 22...Elevating platform, 2
7... Lifting machine, 28... Inspection running rail, 29
...Drive chain, 30...Tow vehicle, 31...Connection rod, 32...Coupler.

Claims (1)

[Claims] 1. A part of the shielding wall of the containment vessel is provided with an airtight casing equipped with an opening/closing door, a running rail that leads into the airtight casing is provided inside the containment vessel, and an inner end of this running rail is provided. An elevating frame that also serves as a guide rail is installed in a nearby position, an elevating trolley equipped with a movable rail is installed on this elevating frame so that it can be raised and lowered freely, a hoisting machine is installed on the upper part of the elevating frame, and this elevating frame is The lifting trolley is raised and lowered by a hanging rope of the upper machine, and the movable rail is provided to receive and place an inspection vehicle running on the traveling rail, and a loop shape is provided above the traveling rail. A rail for inspection is laid, a drive chain is attached near the rail for inspection, and a towing vehicle equipped with a coupler is installed on the drive chain so as to run on the rail for inspection. A mobile inspection device for a nuclear reactor, characterized in that the inspection vehicle is connected to the coupler, and the inspection vehicle can be transferred from a traveling rail to an inspection traveling rail using an elevating cart.