JPH0810267B2 - Refueling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a refueling machine for a nuclear reactor.

(Prior Art) In a nuclear power plant, fuel is exchanged in parallel with a periodical inspection of the plant, which is carried out once a year, and the burned fuel is taken out as spent fuel from the inside of the core and new fuel is used. Is loaded into the core. In addition, since the burnup of other fuels differs depending on the position in the core, the fuels are rearranged in the core so that the output distribution of the entire core becomes uniform. The spent fuel taken out from the core is stored in the fuel storage pool adjacent to the reactor well.

A fuel exchange machine as shown in FIG. 4 is used for such fuel exchange work. This refueling machine comprises a fuel exchange bridge 1 provided above a reactor pressure vessel (not shown) so as to be able to travel across the vessel, a trolley 2 movably provided on this bridge 1, and this trolley 2 Refueling mast 3 suspended from the reactor into the reactor pressure vessel
And a fuel gripping tool 4 attached to the tip of the fuel exchange mast 3, which is remotely operated by an operation panel 6 provided in a remote operation room 5. In addition,
In the figure, 7 is a refueling floor, and 8 is a rail for running the bridge 1.

By the way, in the fuel exchange work by such a fuel exchange machine, since the reactor well is filled with water and the exchange work is performed underwater, it is necessary to perform the fuel exchange while monitoring the operating condition of the fuel exchange machine. Therefore, in the past, an observer was placed on the refueling machine, a transparent acrylic resin plate called a viewing aid was floated above the water surface in order to avoid water surface ripples and light reflections, and the position of the fuel grip 4 was adjusted using binoculars. And was monitoring the operating status. However, according to such a method, there is a problem in that an observer must be arranged on the refueling machine, resulting in an increase in the exposure of the observer.

(Problems to be Solved by the Invention) As described above, in the related art, since a supervisor has been arranged on the refueling machine to monitor the position, operation status, etc. of the fuel gripper 4, it is said that the radiation exposure of the supervisor increases. There was a problem.

The present invention has been made in view of such problems,
An object of the present invention is to provide a fuel exchange machine which can safely perform a fuel exchange operation by remote control without arranging an observer on the fuel exchange machine.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention relates to a refueling bridge provided above a reactor pressure vessel so as to be capable of traveling across the vessel, The remote control room includes a trolley movably provided on the bridge, a fuel exchange mast that is suspended from the trolley into the reactor pressure vessel, and a fuel grip attached to the tip of the fuel exchange mast. In the fuel exchanger that is remotely operated by a command from, the trolley is provided with a telescopic rod that can move in the horizontal direction, the underwater monitoring TV camera and the lighting device are attached to the lower end of the telescopic rod, and the bridge is installed. An operating condition monitoring TV camera for monitoring the operating conditions of the bridge and the trolley is provided on the refueling floor, and the underwater monitoring T camera is installed in the remote control room. It is characterized in that a monitor television for displaying an image captured by the V camera and an image captured by the operation condition monitoring TV camera is installed.

(Operation) In the present invention, since the position and operation status of the fuel gripping tool can be monitored by the monitor TV installed in the remote control room, it is not necessary to arrange a monitor on the refueling machine, and the exposure of the monitor can be reduced. Can be planned.

(Example) Hereinafter, the Example of this invention is described with reference to drawings.

FIG. 1 shows an embodiment of the present invention. This fuel exchanger is equipped with a refueling bridge 1 which is provided above a reactor pressure vessel (not shown) so as to be able to run across the vessel, and moves onto this bridge 1. The trolley 2 includes a trolley 2 that can be installed, a fuel exchange mast 3 that is suspended from the trolley 2 into the reactor pressure vessel, and a fuel gripper 4 that is attached to the tip of the fuel exchange mast 3. An underwater monitoring TV camera device 9 is attached to the device 2.

The underwater monitoring TV camera device 9 includes a telescopic rod 10 which is vertically supported by the trolley 2 as shown in FIG.
With a zoom lens attached to the lower end of this telescopic rod 10
A TV camera with a zoom lens, which includes a TV camera 11 and a lighting device 12, an expansion / contraction mechanism 13 for expanding / contracting the expansion / contraction rod 10 in the vertical direction, and a horizontal movement mechanism 14 for moving the expansion / contraction rod 10 in the horizontal direction. The video imaged by 11 is displayed on the monitor television 15 installed in the remote control room 5. The horizontal movement mechanism 14
Is composed of a rack gear 16, a pinion gear 17, a drive motor 18, etc., as shown in FIGS.

In addition, the fuel exchange floor 7 on which the bridge 1 is installed
A plurality of TV cameras 19 for monitoring the operating conditions of the bridge 1 and the trolley 2 are installed in. These tvs
The video image taken by the camera 19 is a monitor TV set in the remote control room 5 like the underwater monitoring TV camera device 9.
It is supposed to be displayed on 15. Reference numeral 20 in the figure denotes an operation panel provided on the bridge 1.

In the above-mentioned configuration, in order to prevent the influence of the ripples and reflection of light on the water surface during the fuel replacement work, the TV camera 11 with a zoom lens attached to the lower end of the telescopic rod 10 is lowered below the water surface, and the zoom lens An image taken by the attached TV camera 11 is displayed on the monitor TV 15 installed in the remote control room 5.

In this way, the TV camera device 9 for underwater monitoring is attached to the trolley 2.
In addition to installing the monitor television 15 for displaying the video imaged by the underwater monitoring TV camera device 9 in the remote operation room 5, the position and operation status of the fuel gripping tool 4 can be monitored in the remote operation room 5. Since it is possible to perform the fuel exchange work while monitoring at 15, it is not necessary to arrange a monitor on the refueling machine, and it is possible to reduce the exposure of the monitor.

Further, in this embodiment, since the TV camera 19 for monitoring the operation status of the bridge 1 and the trolley 2 is installed on the refueling floor 7, the operation status of the bridge 1 and the trolley 2 is monitored from the window of the remote control room 5. There is no need, and the remote control room 5 can be provided at a place away from the fuel exchanger, and the operability and habitability of the remote control room 5 can be improved. Further, in this embodiment, since the TV camera 9 can be moved in the horizontal direction by the horizontal movement mechanism 14, it is possible to avoid the interference with the reactor internals and eliminate the blind spot for monitoring.

[Effects of the Invention] As described above, the present invention includes a refueling bridge provided above the reactor pressure vessel so as to be capable of traveling across the vessel, and a trolley provided movably on the bridge. In a fuel exchange machine that is equipped with a fuel exchange mast that is suspended from the trolley into the reactor pressure vessel and a fuel grip attached to the tip of the fuel exchange mast, and that is remotely operated by a command from the remote operation room. An extensible rod is provided on the trolley so as to be movable in the horizontal direction, and an underwater monitoring TV camera and a lighting device are attached to the lower end of the extensible rod, and the operation of the bridge and the trolley is performed on the fuel exchange floor where the bridge is installed. An operating condition monitoring TV camera for monitoring the condition is provided, and the image taken by the underwater monitoring TV camera and the operating condition are provided in the remote control room. It is characterized by the installation of a monitor TV that displays images taken by a surveillance TV camera. Therefore, according to the present invention, it is possible to perform the fuel exchange work while monitoring the position and operation status of the fuel gripping tool on the monitor TV in the remote operation room. The replacement work can be performed safely by remote control. Further, according to the present invention, the operating conditions of the bridge and the trolley can be monitored by the monitor TV set in the remote control room, and the underwater monitoring TV camera provided at the lower end of the telescopic rod and the reactor internal structure can be monitored. You can avoid interference and eliminate the blind spots of surveillance.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a fuel exchanger, FIG. 2 is a configuration diagram of an underwater monitoring device, and FIG. 3 is a configuration diagram of a horizontal movement mechanism, FIG. 4 is a diagram showing a conventional fuel exchanger. 1 ... Bridge, 2 ... Trolley, 3 ... Refueling mast, 4 ... Fuel grip, 5 ... Remote control room, 9 ... Underwater monitoring TV camera device, 10 ... Telescopic rod, 11 ... TV camera with zoom lens, 12 …… illuminator, 13 …… expansion mechanism, 14 …… horizontal movement mechanism, 15 …… monitor TV.

Claims (1)

[Claims] 1. A refueling bridge provided above the reactor pressure vessel so as to be able to travel across the vessel, a trolley provided movably on the refueling bridge, and a reactor from this trolley. A fuel exchange machine equipped with a fuel exchange mast that is suspended in a pressure vessel and a fuel gripping tool attached to the tip of the fuel exchange mast, and the telescopic rod is attached to the trolley in a fuel exchange machine that is remotely operated by a command from a remote operation room. Is installed movably in the horizontal direction, an underwater monitoring TV camera and a lighting device are attached to the lower end of this telescopic rod, and the operation status of monitoring the operation status of the bridge and the trolley on the fuel exchange floor where the bridge is installed. A TV camera for monitoring is provided, and an image taken by the TV camera for underwater monitoring and a video camera for monitoring the operation status are taken in the remote control room Refueling machine, characterized in that it has established a monitor television for displaying the image.