JPH02134595A - Fuel inspection device - Google Patents

Abstract

PURPOSE:To intend an improvement of an effectiveness of a fuel inspection work (shortening of a working time) by providing a diffusion panel in front of a submerged light source to make the panel be a planar light source, and by adjusting remotely a brightness of the planar light source by a light adjuster installed on a floor. CONSTITUTION:On a wall surface of a fuel pool below a water surface 1, a fuel channel is withdrawn from a fuel assembly and is made to be a state of a fuel bundle. A main body 21 of a lighting device is hung down by a cable 22 at a periphery of the bundle 10. After that, a plug 29 is connected to a electric power source, the electric power is switched on by switching operation of a switch 27 in a light adjuster 23, an electric bulb in the main body 21 is lit and finally a planar light source through a diffraction panel 29 is provided. Moreover, an visual image on a monitor TV set 12, taken by a submerged V camera 11 arranged at an opposite side of the bundle 10, is adjusted its brightness by a brightness regulating knob 28 so that no halation may appear on the image. This lighting device becomes a back lighting during a fuel inspection work and by elevating and bringing down the fuel bundle 10, intervals among fuel rods appears as an image on the TV set 12 through the camera 11, and consequently an inspection of fuel rods interval can be conducted for whole length of the rods.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a fuel inspection device, and particularly to a fuel inspection device that provides optimum illumination during fuel rod spacing inspection work in a fuel pool.
=Relating to fuel inspection equipment.

(Prior art) Numerous fuel assemblies installed in the core of a nuclear reactor may be damaged during long-term use. We are conducting an inspection.

One of these inspections is a fuel rod spacing inspection, which is carried out as follows. FIG. 4 shows a conventional embodiment. That is, the fuel channel is pulled out from the fuel assembly loaded on the movable platform of the fuel channel attachment/detachment machine (not shown) installed below the water surface ω on the fuel pool wall surface, and the fuel bundle (10) is formed. .

The screen (10) is then placed behind the fuel bundle (10).
3), and while illuminating with a general-purpose underwater lighting device (14) from behind the screen (13), the fuel bundle (10
) Underwater TV camera placed on the opposite side (11)
The fuel rod spacing inspection is performed by projecting the image on the monitor television (12) using the .

(Problem M to be solved by the invention) In this fuel rod spacing inspection, since there is no special lighting equipment for fuel inspection, images are viewed from an underwater TV camera through a monitor TV while being illuminated by a general-purpose underwater lighting equipment. However, there were problems in that the screen was prone to halation and it was difficult to make adjustments when inspecting the fuel rod spacing.

The present invention has been made in view of the above circumstances, and provides a dedicated fuel inspection device that efficiently performs fuel rod spacing inspection work in a fuel pool and improves fuel quality by improving image accuracy. The purpose is to provide.

[Structure of the invention]

(Means for Solving the Problem) That is, the fuel inspection device according to the present invention includes a lighting device main body (21) used underwater, and the lighting device main body (21).
) is connected to the cable (22) and guided to above the floor ■, and a dimmer (23) is attached to the other end of the cable (22), and furthermore, the dimmer! A power cable (24) is attached to 1t (23).

A light source (25) (for example, an incandescent lamp) is built into the casing of the lighting device main body (21), and diffused water (26) is attached to the front surface to form a surface light source.

In addition, the dimmer (23) is equipped with a switch (27) for turning the power on/off and a dimmer knob (28) that allows you to remotely adjust the brightness of the lighting of the underwater lighting device (21). Built-in.

Furthermore, the other end of the power cable pull (24) is attached with a plug (29) for connecting to a power source.

(Function) According to the present invention, when a fuel test is performed using an underwater television, halation is less likely to occur on the screen, and adjustment during the test is facilitated.

(Example) Hereinafter, details of the present invention will be described with reference to an example shown in FIGS. 1 to 3.

In one embodiment of the fuel inspection device according to the present invention, a fuel channel is connected to a fuel assembly loaded on a movable table of a fuel channel attachment/detachment machine (not shown) installed below the water surface ω on a fuel pool wall surface. Pull out the fuel bundle (10)
state.

Thereafter, the cable (22) is placed near the fuel bundle (10).
), the lighting fixture main body (21) is suspended, and an underwater TV camera (11) is placed on the opposite side of the fuel bundle (lO) on the movable platform.

Next, connect the plug (29) attached to the power cable (24) on the floor to the power source, and connect the dimmer (23)
Turn on the power by operating the switch (27) inside the lighting device, turn on the light source (25) inside the lighting fixture body (21), and turn on the light source (25) inside the lighting fixture body (21).
) as a surface light source.

Furthermore, the image taken by the underwater TV camera (11) is displayed on the monitor TV (12), and the dimmer knob (28) in the dimmer 1ft (23) is adjusted so that there is no halation on one screen.
Adjust the brightness remotely.

As described above, this lighting serves as background lighting during the fuel rod spacing inspection, and the fuel bundle (10) is positioned in front of it, and the spacing between the fuel rods is displayed on the screen of the monitor TV (12) by the underwater TV camera (11). It will be done.

In this state, the fuel inspection device is held and the movable table of the fuel channel attachment/detachment machine (not shown) is raised and lowered separately to inspect the fuel rod spacing over the entire length of the fuel bundle (10).

Note that the present invention is not limited to the above embodiment. For example, a fluorescent lamp, an LED, or the like may be used as the light source (25), as long as the effect is the same, and the diffuser plate (26) constitutes a surface light source.

〔Effect of the invention〕

First, a diffuser plate (26) is installed in front of the light source to make it a surface light source, and the brightness of the surface light source can be adjusted remotely using a dimmer @ (23), improving the efficiency of fuel inspection work. improves. In other words, the working time is shortened.

Secondly, by improving image accuracy, fuel inspection becomes reliable and fuel quality can be improved.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of the lighting device main body, Fig. 3 is a schematic configuration diagram illustrating the fuel rod spacing inspection of the present invention, and Fig. 4 is a conventional FIG. 2 is a schematic configuration diagram illustrating fuel rod spacing inspection. 21...Lighting device body 22...Cable 23
...Dimmer @24...Power cable 25...Light source 26...Diffusion plate

Claims (1)

[Claims] A lighting device used underwater, a cable led from the lighting device to the floor, a dimmer connected to the end of the cable, and a power cable with a plug connected to the dimmer. The lighting device has at least one built-in light source, a diffuser plate is arranged on the front side to form a surface light source, and the brightness of the main light source can be adjusted remotely by the dimmer. fuel inspection equipment.