JPH0513085Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a television camera used for visual confirmation of work inside a hot cell that handles highly radioactive materials, and more specifically relates to a television camera that is used to visually confirm work inside a hot cell that handles highly radioactive materials, and more specifically to This invention relates to a television camera for monitoring inside a hot cell that can be taken in and out together with a stopper.

Prior Art Conventionally, as shown in FIG.
This is carried out using mechanical devices that can be remotely controlled, such as an in-cell overhead crane (not shown) and a power manibrator 1 installed inside the building. That is,
This includes disassembly and assembly work for parts replacement, repair, and inspection of all machines and equipment within the hot cell.

When carrying out such work, the work is usually carried out while visually checking through the shielding window 4 provided in the shielding wall 2, as shown in FIG. but,
This shielding window 4 is simply embedded in the shielding wall 2 made of concrete or the like thick enough to withstand high radiation, and the entire shielding window 4 cannot be formed as a shielding window made of lead glass. . In addition, since the entire hot cell 6 is made into a sturdy structure with earthquake resistance, there is a pillar in the direction perpendicular to the page of FIG. Can not.

Therefore, a blind spot is created within the hot cell that cannot be visually confirmed through the shielding window 4. To compensate for this blind spot, a television camera 3 has conventionally been installed inside the hot cell. This television camera 3 is installed on a bracket 8 protruding from the shielding wall 2 via a mounting base and an electric pan head that can be attached and detached by remote operation. By the way, this television camera 3 may also be damaged or malfunction due to high radiation after a certain period of time has passed. In consideration of such a case, the television camera 3 could only be installed at a height below the reach of the arm 9 of the power manibrator 1 so as to be replaceable by remote control. In Figure 1, 1
2 is a ceiling hatch, and 13 is equipment installed inside the hot cell 6.

By the way, the actual work inside the hot cell is as follows:
In order to further reduce blind spots within the cell, it is desirable to utilize the television camera more effectively, for example, up to the point X in FIG. 1 or a height position close to this point. If the TV camera 3 is
If the TV camera can be installed at a high point and can be easily replaced in the event of a breakdown, work inside the hot cell will be much easier, and the effect on remote workability will be significant.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to attach and remove a shielding plug to and from a wall penetrating sleeve that forms part of a shielding wall and is provided on the shielding wall. To provide a television camera for monitoring inside a hot cell, which can be replaced, and therefore can be installed at the point x in FIG. 1 beyond the reachable height of the power manibrator. be.

Summary of the invention In order to achieve the above object, the hot cell interior monitoring TV camera of the present invention is provided with a wall penetrating sleeve that penetrates the shielding wall of the hot cell, and is removable from the sleeve, and when fitted, a part of the shielding wall is removed. A television camera is attached to the hot cell side end of the shield plug. Therefore, by attaching and detaching the shield plug to and from the wall-penetrating sleeve, the television camera can also be attached and detached.The camera body and parts can be replaced outside the cell, and the television camera can be mounted at a high position inside the hot cell without creating a blind spot. It can be installed.

Embodiment Next, the embodiment shown in FIGS. 2 and 3 will be described. Note that the same parts as in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. Therefore, in the figure, 10
11 is a wall penetrating sleeve provided at a desired position of the shielding wall 2 so as to penetrate therethrough; 11 is a shielding plug that is detachable from the wall penetrating sleeve 10; It has the same radioactivity shielding function as this.

A bracket 8 is provided to extend parallel to the axial direction from the tip of the shielding plug 11 on the hot cell side.
A television camera 3 is installed on the tip of the camera 3 so as to be rotatable about a support shaft 15 via an electric pan head 5 . The height of the TV camera 3 is the height of the wall penetrating sleeve 1.
It is housed within the inner diameter of 0. In the figure, 7 is boots.

The power cables and control cables for the television camera 3 and the electric pan head 5 are embedded in a circumferential groove (not shown) along the shielding plug 11 from inside the hot cell and drawn out of the cell. It's summery.

According to the above configuration, when the television camera 3 or the electric pan head 5 breaks down, by pulling the shield plug 11 out of the cell, it is possible to replace it with a new one or perform maintenance and inspection outside the cell. Also,
When decontaminating the entire inside of the cell, pull out the TV camera 3 outside the cell in advance, attach a blind plug instead, and pour water or water into the cell.
It can also prevent damage caused by chemicals and the like. The sleeve 10 is provided with a stepped portion 14 so that its outer end side is widened, and the diameter of the shield plug 11 is increased accordingly at its outer end side to ensure reliable attachment and detachment.

Effects of the invention As described above, by the operation of attaching and detaching the wall drawer shielding plug according to the present invention to and from the wall penetrating sleeve, the television camera is also attached and detached, and the camera body and
Parts can be replaced and maintained, so you can work reliably.
Replacement parts do not necessarily need to be made into blocks;
It is economical and can also shorten the time required to work outside the cell in the event of a camera failure. Furthermore, the position of installing the wall-penetrating sleeve can be selected as appropriate, which means that the TV camera can be installed at a higher position than can be maintained with a manibrator, etc., so blind spots inside the hot cell can be reduced, making work inside the hot cell much easier. , remote workability is significantly improved. In addition, contamination of the camera itself can be reduced.

Furthermore, since the television camera is integrated with the shielding plug, there is no need for remote maintenance and reliability can be improved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view showing the inside of a conventional hot cell, Fig. 2 is an explanatory cross-sectional view showing the inside of a hot cell in which a television camera for monitoring the inside of the hot cell according to the present invention is installed, and Fig. 3 is a detail of part A in Fig. 2. It is a diagram.

Claims (1)

[Scope of utility model registration request] In a television camera 3 used in a hot cell 6, a wall penetrating sleeve 10 is provided which penetrates the shielding wall 2 of the hot cell 6, a shielding plug 11 is removably provided in the sleeve 10, and the shielding plug 11 is attached to the hot cell side. A television camera for monitoring inside a hot cell, characterized in that a television camera 3 is attached to the tip.