JPH0221557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear reactor containment vessel internal inspection device for inspecting various equipment within the reactor containment vessel.

Generally, a BWR nuclear power plant is provided with a reactor pressure vessel 1 containing a reactor core and coolant, and a reactor shield wall 2 that shields radiation from the reactor. There are various piping around,
There are valves and equipment, which are stored inside the reactor containment vessel.

If a coolant loss accident occurs inside the reactor containment vessel, radioactivity exceeding the allowable level will be released into the environment. Even after that, it is required to be airtight from the outside.

In addition, inside the reactor containment vessel, the various piping mentioned above,
There are valves and equipment, and there is a demand to inspect these both during normal operation and in the unlikely event of an accident, but the radiation level inside the reactor containment vessel is high and it is inappropriate for inspectors to go inside. It is possible.

Therefore, methods are being developed to obtain information externally by installing unmanned inspection equipment inside the reactor containment vessel, but the environmental conditions inside the reactor containment vessel are approximately 60°C during normal operation, and during an accident Temperatures reach approximately 170°C, albeit for a short period of time, and designing unmanned inspection equipment under such conditions poses difficult problems.

In view of such problems, the present invention has been developed to provide an inspection inside the reactor containment vessel that allows maintenance of an inspection vehicle that moves inside the reactor containment vessel while the reactor is operating, while maintaining the airtightness of the reactor containment vessel. The purpose is to provide equipment.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

1 and 2, reference numeral 1 is a pressure vessel, and the lower part of this pressure vessel 1 is a pedestal 2.
These pressure vessels and pedestals are housed within the reactor containment vessel 3. Inside the reactor containment vessel 3, a large number of pipes, valves, and various devices (not shown) are arranged. A running rail 5 on which an inspection vehicle 4 runs is arranged around the pedestal 2 in a loop shape so as to pass near the piping, valves, and various devices. An airtight chamber 6 for temporarily storing the inspection vehicle 4 is provided on the wall of the containment vessel, and airtight doors 6a and 6b are provided at both ends of the airtight room 6, and these airtight doors 6a and 6b isolate the inside and outside of the containment vessel. It has the function of

A chain 7 for driving the inspection vehicle 4 is disposed along the travel rail 5, and this chain 7 is driven by a drive device 8 provided within the containment vessel 3.

The chain 7 is housed in a guide tube 9 having a slit 9a (FIG. 4), and most of the chain 7 is disposed along the traveling rail 4.

In FIG. 3, FIG. 4, and FIG. 5, an inspection vehicle 4 and a driving vehicle 11 are suspended on a traveling rail 5,
The inspection vehicle 4 has running wheels 12, 12 and a guide wheel 1.
3, 13...13 and a suspension section 14 consisting of a support frame 13a that supports these wheels, and this suspension section 14.
It has an inspection section 15 consisting of various inspection instruments suspended from the inspection section 15.

Like the inspection vehicle 4, the drive vehicle 11 also has running wheels 16, 16, guide wheels 17, 17...17, and a support frame 18.

Although not shown, the inspection section 15 is equipped with sensors necessary for various inspections, such as a television camera, a thermometer, and a dosimeter, as well as equipment for measuring and transmitting signals. The inspection vehicle 4 and the driving vehicle 11 are connected by couplers 19 and 20. Drive vehicle 11
is provided with connecting arms 21 and 22 at its bottom, these two members are connected by a pin 23, and the upper end of the connecting arm 22 is connected to the chain 7. In addition, the connecting arm 21
One end is connected to one end of a shaft 25 rotatably supported by a bearing 24 on the support frame 18 of the drive vehicle. A link 27 having a roller 26 at its tip is fixed to the other end of the shaft 25.

On the other hand, the coupler 20 of the driving vehicle is rotatably attached to the support frame 18 with a pin 28, and the coupler 20 is
It is urged downward by a push spring 31 and engages with the coupler 19 of the inspection vehicle 4. When the link 27 rotates clockwise, the push spring 29 is pushed up and both couplers 19, 20 rotate. and are configured to dissociate from each other.

The traveling rail 5 is bent toward the airtight door near the airtight chamber 6, and there is a movable rail 29 (see FIG. , Fig. 3) are provided. Furthermore, the movable rail 29 can also be connected to a traveling rail 30 outside the containment vessel when the airtight door 6b is opened.

In addition, the guide tube 9 of the chain is in the airtight chamber 6.
As shown in Fig. 3, it is bent upward in the vicinity.

Next, the effect will be explained.

During the inspection, the inspection vehicle 4 is connected to the drive vehicle 11 via couplers 19 and 20, and the drive vehicle 11 is coupled to the chain 7 via links 23 and 24, so that it drives the chain drive device 8. Accordingly, the inspection vehicle 4 can be moved along the traveling rail 5. When the inspection vehicle 4 is to be taken out of the containment vessel for maintenance or other reasons, the following procedure is followed.

First, the airtight door 6a inside the containment vessel is opened, and the movable rail 29 is projected into the containment vessel 3 and connected to the traveling rail 5. Next, the chain 7 is driven to cause the inspection vehicle 4 to approach the airtight door 6a. When the drive wheel 11 comes to the bend of the chain, the link 22 rotates the shaft 25 clockwise due to the relative height positional relationship between the traveling rail 5 and the chain 7.
This causes the link 27 to rotate and the coupler 20 to be separated from the coupler 19 of the inspection vehicle. In this state, the operation of the drive device 8 is stopped. At this time, inspection vehicle 4
is on the movable rail 29, so the movable rail 29
When the inspection vehicle 4 is pulled into the airtight chamber 6, the inspection vehicle 4 also enters the airtight chamber 6.
stored inside. Then, close the airtight door 6a,
The worker replaces the contaminated air in the airtight room 6 with clean air, opens the airtight door 6b, and then closes the airtight room 6.
Perform maintenance and inspection of inspection vehicles inside the facility.

Furthermore, by connecting the movable rail 29 to the rail 30 outside the containment vessel, the inspection vehicle 4 can be carried out of the airtight room.

Next, a modification of the present invention will be shown.

In FIGS. 6 and 7, the movable rail 40
An actuator 41 that moves up and down is installed in the airtight chamber 6, and the inspection vehicle 42 and the drive vehicle 43 are connected by connectors 44 and 45. The connector 44 has a hole 44a formed therein, and the inspection vehicle 42 and the drive vehicle 43 are connected to each other by connectors 44 and 45. Vessel 45
The pin 45a is fitted. With the inspection vehicle 42 on the movable rail 40 and the drive vehicle 43 on the traveling rail 5 inside the containment vessel, the actuator 4
1 and lowers the movable rail by a distance δ shown in FIG. 7, the connection between the inspection vehicle 42 and the driving vehicle 43 is released. After that, when the movable rail 40 is pulled into the airtight chamber 6, the inspection vehicle 42
can be taken out of the containment vessel.

As explained above, the reactor vessel interior inspection system of the present invention monitors various equipment of the reactor during operation using a television camera, thermometer, dosimeter, etc. mounted on an inspection vehicle that can be remotely controlled from outside the containment vessel. Since the inspection vehicle can be pulled into the airtight room and kept there when necessary, the reliability of various devices mounted on the inspection vehicle can be significantly improved.
Moreover, since the inspection vehicle is driven by a traveling drive device (chain 7, drive device 8, and drive vehicle 11), there is no need to incorporate a self-propelling drive device into the inspection vehicle unlike in a self-propelled type, making the inspection vehicle compact. Since the chain is stationary, there are no space restrictions to some extent, and cooling can be freely designed to accommodate the temperature inside the containment vessel.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of the reactor containment vessel internal inspection device of the present invention, Fig. 2 is a top view of the inside of the reactor containment vessel, Fig. 3 is an explanatory diagram of the connection state of the inspection vehicle and the drive vehicle, and Fig. 4 The drawings are a view taken in the direction of arrow A in Fig. 3, Fig. 5 is a detailed view of the connecting portion between the inspection vehicle and the drive vehicle, Fig. 6 is an explanatory diagram of a modification of the present invention, and Fig. 7 is a view of the inspection vehicle in Fig. 6. FIG. 3 is a detailed explanatory diagram of a connecting portion of a driving vehicle. 3...Reactor containment vessel, 4...Inspection vehicle, 5...Traveling rail, 6...Airtight chamber, 7...Drive chain, 8...Drive device, 11...Drive vehicle, 15...Inspection section, 19, 20
...Coupler, 29...Movable rail.

Claims (1)

[Scope of Claims] 1. An inspection vehicle equipped with means for inspecting various equipment within the reactor containment vessel; A running rail disposed within the reactor containment vessel on which the inspection vehicle runs; and On the running rail. a driving vehicle that is arranged to be able to travel and pulls the inspection vehicle; a connecting device that removably connects the inspection vehicle and the driving vehicle; a connecting device attachment/detachment mechanism that connects and detaches the connecting device; and an opening/closing door. An inspection device for inside a nuclear reactor containment vessel, comprising: an airtight chamber in which an inspection vehicle can be stored; and a movable rail that is arranged so as to be accessible in and out of the airtight chamber and connectable to the travel rail. 2. The connecting means is characterized by comprising a fixed hook fixed to either the inspection vehicle or the drive vehicle, and a swinging lever having a hook portion at its tip that can be engaged with the fixed hook. A nuclear reactor containment vessel internal inspection device according to claim 1. 3. The movable rail is arranged to be movable in the vertical direction within the airtight chamber, and the connecting means is provided with a pin and a pin hole that can be inserted and removed in the vertical direction. Inspection device inside the reactor containment vessel.