JP2000346976A - Incore structure inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inspection device capable of visually inspecting the incore structure the same as conventional inspection and also a long term visual inspection work without using a fuel exchanger machine. SOLUTION: The device is constituted of a pair of wheel type moving mechanism 15 loaded on both rails 4 of a fuel exchanger machine, a tensioning mechanism 16 for stretching wires 17 in parallel between the wheel type moving mechanisms 15 and 15, a hanging type moving mechanism 18 having a holding mechanism of underwater TV camera 14, the underwater TV camera 14 moving in connection with an underwater TV camera elevation mechanism 21, a monitoring underwater camera 43, a monitor 27 for watching and remote operation panel 19 and an image recorder 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a steam drying apparatus which is temporarily placed in a fuel pool, a reactor pressure vessel and an equipment storage pool from an operation floor of a reactor building during a periodic inspection of a nuclear power plant. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection apparatus capable of performing an appearance inspection on a furnace internal structure such as a vessel using an underwater television camera.

[0002]

2. Description of the Related Art Conventionally, appearance inspections of structures in an equipment storage pool, a fuel pool, and a reactor pressure vessel (hereinafter referred to as V
The method of accessing the underwater television camera to perform T) is to suspend the underwater television camera from the refueling machine to the inspection site using the cable of the underwater television camera,
The VT is performed by moving the refueling machine to a position where the image of the underwater television camera can be properly inspected for the inspection site of the structure, but the recent trend is to increase the power generation operation rate of the plant. As the period of regular inspections has been shortened, the time during which the refueling machine can be used has been limited.

Further, in order to perform a detailed VT, a still image is required in a state where the underwater television camera is fixed, but a conventional method in which the underwater television camera is operated using a cable of the underwater television camera. In such a case, it is very difficult to obtain a still image on a monitor, and the inspection time and inspectability in the VT often depend on the skilled technique of the operator of the underwater television camera. It was also a factor.

[0004]

In such a conventional inspection method using a refueling machine, in the case of a shortened process that has become the mainstream of the current periodic inspection, the time during which the refueling machine can be used for VT is limited. If there is not enough time to perform a sufficient inspection, or if there is a process to use a refueling machine in another operation, it will be limited due to the balance with other operations. In some cases, there is a problem that hinders the shortening process.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a fuel storage device, a fuel pool, and a reactor pressure vessel, even if a refueling machine is used for other work. The VT of the structure can be performed, and a sufficient inspection time can be secured even in a limited time frame of the shortened process. In addition, since the operation of the underwater television camera by a human system becomes mechanical, a long inspection work and stable images can be obtained, and a furnace structure inspection apparatus capable of improving the reliability of the inspection is provided. It is in.

[0006]

According to a first aspect of the present invention, a pair of wheel-type moving mechanisms are movably mounted on a rail on which a refueling machine laid on an operation floor of a reactor building runs. A tensioning device is mounted on each of the wheel-type moving mechanisms, a wire is stretched between the tensioning devices, and a suspension-type moving mechanism is provided on the wire. Attach the underwater TV camera cable while hanging the TV camera, attach one end of this underwater TV camera cable to the underwater TV elevating device, connect this underwater TV elevating device to the remote control panel, and view the imaging signal of the underwater TV camera. It is characterized in that it is configured to be observed on an inspection monitor.

According to the first aspect of the present invention, for example, during a periodic inspection of a nuclear power plant, as a means for performing VT of a reactor internal structure from an operation floor of a nuclear reactor building, a refueling machine is used for traveling. A pair of wheel-type moving mechanisms are mounted on the two laid rails, respectively.
A wire is stretched in parallel between the pair of wheel-type moving mechanisms,
A hanging type moving mechanism that can move using a wire as a guide is mounted. By driving the wheel-type moving mechanism and the hanging-type moving mechanism, the appearance inspection of the furnace internal structure can be remotely and automatically performed.

According to a second aspect of the present invention, the pair of wheel-type moving mechanisms has wheels running on the rail and a position detector,
A detection signal detected by the position detector is sent to a control panel, displayed on the visual inspection monitor connected to the control panel, and driven by the control panel in synchronization with a moving direction, a moving speed, and a moving amount. It is characterized by.

According to the second aspect of the present invention, the pair of wheel-type moving mechanisms are connected by a cable and operated from a control panel, so that the moving direction, the moving speed and the moving amount of the pair of wheel-type moving mechanisms are synchronized. Can be driven. Further, signals detected by the position detectors of the pair of wheel-type moving mechanisms can be displayed on a monitor connected to the control panel.

According to a third aspect of the present invention, the hanging type moving mechanism has a turning structure member for fixing and turning the underwater television camera cable and a position detector, and the turning structure member and the position detector are controlled by the control unit. It is operated by a panel.

According to the third aspect of the present invention, the underwater television camera can be easily turned by the suspension type moving mechanism, and the position signal detected by the position detector can be displayed on the monitor connected to the control panel.

According to a fourth aspect of the present invention, the pair of tensioning mechanisms have a tension adjusting portion for extending the wire and a wire fixing portion. According to the fourth aspect of the present invention, the wires can be stretched in parallel by the pair of tensioning mechanisms, and adjustment of the tension and fixing of the wires are easy.

According to a fifth aspect of the present invention, the underwater television camera comprises a CCD camera or a black-and-white camera of an image pickup tube type, and has a zoom function, a viewing direction changing function, and an illumination lamp.

According to the fifth aspect of the present invention, the underwater television camera is provided with a zoom function, a function of changing the direction of view, and an illumination lamp, thereby facilitating the appearance inspection.
Further, the image pickup tube type monochrome camera can adjust the light amount as needed.

According to a sixth aspect of the present invention, the underwater television camera elevating mechanism has an elevating member for elevating and lowering the underwater television camera via the underwater television camera cable, and an elevation detector for the underwater television camera, The elevation detector is connected to the control panel.

According to the sixth aspect of the present invention, the underwater television camera can be moved up and down via the cable by the underwater television camera elevating mechanism. In addition, a signal detected by the elevation detector can be displayed on a monitor.

According to a seventh aspect of the present invention, an underwater television camera for monitoring is provided in the hanging type moving mechanism, and the underwater television camera for monitoring has a swinging mechanism, a zoom function, and a member for mounting the hanging type moving mechanism. It is characterized by the following.

According to the seventh aspect of the present invention, the underwater television camera for monitoring can be rotated 360 ° by the hanging-type moving mechanism, the zoom mechanism and the swinging mechanism.
It is possible to observe the spherical visual field extending to the left and right.

According to an eighth aspect of the present invention, a power transformer having a standard capacity capable of moving and supplementing a required power supply of the entire apparatus is installed on the operation floor, and a recording and recording apparatus, an image processing apparatus, and a monitor for visual inspection are installed on the power transformer. It is characterized by being mounted.

According to the invention of claim 8, the monitor is connected to the control panel, and the positions of the wheel type moving mechanism and the hanging type moving mechanism with respect to the furnace internals can be displayed on the monitor. The inspection recorder can be composed of a video recorder, video typewriter, video printer, imaging device, monitor, and the like. Further, the power supply transformer can cover the electric capacity required for each component device, member, and the like of the furnace internal structure inspection device.

In the present invention, as described above, a pair of wheel-type moving mechanisms are mounted on each rail of the refueling machine,
A wire is stretched in parallel between the wheel-type moving mechanisms, and a hanging-type moving mechanism that can move using the wires as a guide is attached to the wires. An underwater television camera is previously mounted on the suspension-type moving mechanism, and the wheel-type moving mechanism and the suspension-type moving mechanism are moved to the structure.

Thereafter, the underwater television camera is lowered to the inspection part of the structure by the underwater television camera elevating mechanism, and the underwater television camera is rotated to the inspection target part by the turning mechanism incorporated in the suspension type moving mechanism. VT is performed. In addition, the state of accessing the structure can be monitored by a monitoring underwater television camera mounted on the suspension-type moving mechanism.

By performing the VT of the internal structure of the reactor using the inspection apparatus according to the present invention, even if the refueling machine is used for other operations, the VT can be stored in the equipment storage pool, the fuel pool, and the reactor pressure vessel. VT can be performed on the furnace internals.
In addition, since the VT process time can be sufficiently secured within the limited time frame of the shortened process, the soundness of the structure can be confirmed by performing more detailed inspection, and the structure It can also contribute to improving safety.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a furnace structure inspection apparatus according to the present invention will be described with reference to FIGS. FIG. 1 shows an inner structure inspection apparatus 1 according to the present invention mounted on rails 4 on which a refueling machine 3 of a reactor building operation floor 2 runs, and a steam dryer in an equipment storage pool 11.
13 with the underwater television camera 14 of the inspection device 1
FIG. 4 is a cross-sectional view showing a mode in which an inspection site of a steam dryer 13 is accessed to perform T.

In FIG. 1, reference numeral 5 denotes a reactor pressure vessel,
6 is a shroud, 7 is a core placepurger, 8 is C
An RD housing, 9 is a fuel pool, and 10 is a fuel rack. FIG. 2 is a cross-sectional view showing a form in which a steam dryer 13 in an equipment storage pool 11 is subjected to an appearance inspection (VT) by an underwater television camera 14 using the in-furnace structure inspection apparatus 1.

That is, in FIGS. 1 and 2, the wheel type moving mechanism 15 of the reactor internal structure inspection apparatus 1 is mounted on the rail 4 on which the refueling machine 3 runs on the operation floor 2 of the reactor building. This wheel type moving mechanism 15
A tensioning mechanism 16 for stretching the wire 17 in parallel and an underwater TV camera elevating mechanism 21 are installed on the top.

On the tensioning mechanism 16, a remote control panel (which also controls the underwater television camera for monitoring) 19 and a monitoring monitor 20 are installed. The underwater television camera elevating mechanism 21 installed on the wheel type moving mechanism 15 has a structure capable of elevating and lowering the underwater television camera 14 via an underwater television camera cable 22.

The power transformer 23 is connected to the wheel-type moving mechanism 15, and a tire 24 is provided below the power transformer 23 so that the power transformer 23 can perform a movement following the movement of the wheel-type moving mechanism 15. It has become. Further, the power transformer 23 can supply all necessary power to the furnace internal structure inspection apparatus 1.

The monitoring monitor 20 displays a plan view of the reactor building operation floor 2 (positions of the internal structures in the fuel pool 9, the reactor pressure vessel 5, and the equipment storage pool 11), and further includes wheels. The positions of the moving mechanism 15 and the suspended moving mechanism 18 are displayed. While checking the display of the monitoring monitor 20, the underwater television camera 14 is remotely moved to a position where the VT of the steam dryer 13 can be performed. The wheel type moving mechanism 15 and the hanging type moving mechanism 18 are moved by the operation panel 19.

Next, the underwater television camera 14 is
While confirming the image from, the remote control panel 19 operates the underwater television camera elevating mechanism 21 to lower the underwater television camera 14 until the underwater television camera 14 can perform the VT of the steam dryer 13. After that, the hanging type moving mechanism 18 is operated by the remote control panel 19 while watching the VT monitor 27, the view direction of the underwater television camera 14 is adjusted, and an image of the inspection part of the steam dryer 13 is obtained.

This video signal can be recorded on a video deck via a video typewriter built in the recording / recording device 25. Alternatively, after transmitting the video signal of the underwater television camera 14 to the image processing device 26 and performing image processing or the like, the data can be stored in an optical desk built in the recording and recording device 25. The image of the underwater television camera 14 and the image processing device 26 can be displayed on the VT monitor 27 by a changeover switch on the recording / recording device 25.

The movement of the underwater television camera 14 is as follows.
The display on the monitoring monitor 20 is switched by a switch on the remote control panel 19, and the plan view of the reactor building operation floor 2 is switched to the image of the monitoring underwater television camera 43, and the underwater television camera 14 is moved to the inspection site of the steam dryer 13. We will monitor the status of access.

FIGS. 3A and 3B show a tensioning mechanism.
FIG. 3 is a diagram showing a configuration of a suspension type moving mechanism 18 mounted on a wire 17 stretched in parallel by 16; FIG. 3A mainly shows the upper body 28 of the suspension type moving mechanism 18, and FIG.
(B) also shows the lower body 29 mainly.

The suspension type moving mechanism 28 is divided into an upper body 28 and a lower body 29. The drive wheel 31 is rotated by the drive motor 30 provided in the upper body 28, and the other drive wheel 31 is rotated via the coaxially mounted gear 32, whereby the wire 17 can be moved.

An underwater television camera cable guide 33 is mounted on the upper part of the upper body 28. Upper body 28
Is provided with a hinge-type hanger 34 at the bottom. After the hanger bar 36 of the lower body 29 is stored in the hanger 34, the fall-off prevention bracket 35 is attached.

A turning body 38 is attached to the lower body 29 via a turning fixed gear 37 and a bearing. The turning body 38 can turn around the turning fixed gear 37 by driving the turning motor 39. A hold ring 41 interlocked with an air cylinder 40 for fixing the underwater television camera cable 22 is provided below the revolving body 38.
Is installed.

The underwater television camera 22 passes through the underwater television camera cable guide 33 of the upper body 28, passes through the camera cable hole 42 of the lower body 29, and passes through the hold ring 41. When the viewing direction of the underwater television camera 14 is desired to be changed during VT, the underwater television camera cable 22 is fixed by the hold ring 41, and then the turning body 38 is turned to change the viewing direction of the underwater TV camera 14. Alternatively, an image required for VT can be obtained.

FIG. 4 shows a CCD camera appearance inspection apparatus 44 of the underwater television camera 14, and FIG. 5 shows an appearance view and a sectional view of an image pickup tube type monochrome camera appearance inspection apparatus 48. The two visual inspection devices 44 and 48 share a common underwater TV camera cable 22
It is structured to be connected to

In this case, when the radiation dose of the environment to be used is low (such as the fuel rack 10 in the fuel pool 9), the CCD camera appearance inspection device 44 is used, and when the radiation dose is high (in the reactor pressure vessel 5). The purpose is to perform VT simply by changing the camera body of the underwater television camera 14 when it is necessary to use the imaging tube type black-and-white camera appearance inspection device 48 for the core place sparger 7). It has a structure.

The CCD camera visual inspection device 44 shown in FIG. 4 has a structure in which a built-in motor is driven to drive a CCD camera 45 and a small illumination 46 connected by a rotating arm 47 in conjunction with each other. Direction about 120 ° from vertical
, And has a structure effective for obtaining a delicate image necessary for performing a detailed VT or the like.

The small lighting 46 is a single circuit on the left and right sides, and each small lighting 46 has a light quantity adjusting function, and is used for VT such as suppressing halation when halation occurs on the inspection surface. Have valid features.

An image pickup tube type black-and-white camera appearance inspection device 48 shown in FIG.
Has a structure that allows direct viewing and side viewing via the mirror 52. In the case of a side view, the mirror 52 is moved via the rotating shaft 50 and the bevel gear 51 by driving the motor built in the image pick-up tube type black-and-white camera visual inspection device 48, and the viewing direction is shifted up and down by about 30 from the horizontal direction. It has a function that can be changed in the range of °, and has an effective structure for obtaining a delicate image necessary for performing a detailed VT or the like.

The small lighting 46 is a circuit for lighting the small lighting 46 for side and direct viewing. In the case of side view and direct view, each small illumination 46 has a light amount adjustment function that is a single circuit, and the light amount adjustment function is used to suppress halation when halation occurs on the inspection surface.
It has an effective function for T.

[0044]

According to the present invention, it is possible to perform VT of the furnace internals without using a refueling machine traveling on the rails of the operation floor. Therefore, the time required for VT can be sufficiently secured even within the limited time frame of the shortened process, so that a detailed inspection can be performed, and the soundness of the furnace internal structure can be confirmed. It can also contribute to improving safety.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state in which an inspection device is accessed to a steam dryer in an equipment storage pool in a first embodiment of a furnace internal structure inspection device according to the present invention.

FIG. 2 is an apparatus layout diagram showing, in an enlarged scale, a state in which a steam dryer in an equipment storage pool is visually inspected in FIG.

3A is a perspective view showing the vicinity of an upper body of the suspension type moving mechanism in FIG. 2, and FIG.

4 (a) is a CC of the underwater television camera in FIG. 2;
FIG. 2B is an external view showing a D-camera visual inspection device, and FIG.
External view seen from 90 ° direction.

5 (a) is a cross-sectional view showing an example in which the underwater television camera in FIG. 4 (a) is constituted by an imaging tube type black-and-white camera in a partial side view, and FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 reactor internal structure inspection device 2 reactor building operation floor 3 refueling machine 4 rail 5 reactor pressure vessel 6 shroud 7 core sparger 8 CRD housing 9 Fuel pool, 10 ... Fuel rack, 11 ... Equipment storage pool, 12 ... Shroud head,
13… Steam dryer, 14… Underwater TV camera, 15… Wheel-type moving mechanism, 16… Tensioning mechanism, 17… Wire, 18… Suspended moving mechanism, 19… Remote control panel, 20… Monitor for monitoring,
21 ... underwater TV camera elevating mechanism, 22 ... underwater TV camera cable, 23 ... power transformer, 24 ... tire, 25 ... recording and recording device, 26 ... image processing device, 27 ... VT monitor, 28 ...
Upper body, 29 ... Lower body, 30 ... Drive motor, 31 ... Drive wheel, 32 ... Gear, 33 ... Underwater TV camera cable guide, 34 ... Hanger, 35 ... Fall-off prevention bracket, 36 ... Hanger bar,
37 ... fixed gear for turning, 38 ... turning body, 39 ... motor for turning, 40 ... air cylinder, 41 ... hold ring, 42 ... camera cable hole, 43 ... underwater TV camera for monitoring, 44
… CCD camera appearance inspection device, 45… CCD camera, 46…
Small illumination (with protective net), 47: rotating arm, 48: imaging tube type black and white camera appearance inspection device, 49: imaging tube, 50: rotating shaft, 51: bevel gear, 52: mirror, 53: glass.

Claims (8)

[Claims] 1. A pair of wheel-type moving mechanisms are movably mounted on a rail on which a refueling machine runs on an operation floor of a reactor building, and a tensioning device is mounted on each of the pair of wheel-type moving mechanisms. Mounted, a wire is stretched between the tensioning devices, and a suspension-type moving mechanism is provided on the wire. Attach, one end of the underwater TV camera cable is attached to the underwater TV elevating device, this underwater TV elevating device is connected to a remote control panel, and the underwater television camera image signal is observed on a visual inspection monitor. Investigation equipment for furnace structure. 2. The pair of wheel-type moving mechanisms have wheels running on the rail and a position detector, send a detection signal detected by the position detector to a control panel, and connect the external appearance to the control panel. The furnace internal structure inspection apparatus according to claim 1, wherein the apparatus is displayed on an inspection monitor, and is driven and operated in synchronization with a moving direction, a moving speed, and a moving amount from the control panel. 3. The hanging type moving mechanism has a turning structure member for fixing and turning the underwater television camera cable and a position detector, and the turning structure member and the position detector are operated by the control panel. The furnace internal structure inspection apparatus according to claim 1, wherein: 4. The furnace internal structure inspection apparatus according to claim 1, wherein the pair of tensioning mechanisms include a tension adjusting section for extending the wire and a wire fixing section. 5. The furnace structure inspection apparatus according to claim 1, wherein the underwater television camera comprises a CCD camera or an imaging tube type black-and-white camera, and has a zoom function, a view direction changing function, and an illumination lamp. 6. The underwater television camera elevating mechanism includes an elevating member for elevating and lowering the underwater television camera via the underwater television camera cable, and an elevating amount detector of the underwater television camera. 2. The apparatus according to claim 1, wherein the apparatus is connected to the control panel. 7. The underwater surveillance television camera is provided on the suspension type moving mechanism, and the surveillance underwater television camera has a swinging mechanism, a zoom function, and a suspension type movement mechanism mounting member. The furnace internal structure inspection device according to claim 1. 8. A power transformer having a standard capacity that is movable on the operation floor and can supply the necessary power of the entire apparatus, and a recording and recording apparatus, an image processing apparatus, and a monitor for visual inspection are mounted on the power transformer. The furnace structure inspection apparatus according to claim 1, wherein: