JPS58193503A - Penetration part of optical fiber cable - Google Patents

Abstract

PURPOSE:To obtain the titled penetration part which has superior heat resistance, heat cycle resistance, and radiation resistance by welding an optical fiber cable to a pipe which penetrates an end plate through a flexible member and a specific sealing element. CONSTITUTION:The sealing element in use is manufactured by successive lamination starting with a cylindrical glass with a coefficient of thermal expansion close to that of the flexible member 7 and ending with a glass with a coefficient of thermal expansion close to that of an optical fiber cable 6. Namely, the optical fiber cable 8 is welded to the pipe 9 inserted into a hole formed in the end plate 10 of a nuclear reactor vessel, etc., by using the metallic flexible member 7 such as ''Kovar'' and said glass-made sealing member 8 to form the optical fiber penetration part for the vessel.

Description

[Detailed Description of the Invention] This invention does not require attachment to the wall of a container such as a nuclear reactor containment vessel.
The present invention relates to an optical fiber table negative passage section which is an application product of an electric machine penetration section that constitutes an electric line inside and outside the container, and also serves as an airtight boundary inside and outside the container.

A conventional device of this type is shown in FIG.

In the figure, (1) is an optical fiber cable, (2) is a 7
Lunge, (8) is a pipe through which the optical fiber cable (1) is inserted, (4) is the 7 lange (21 and pipe (4)).
8), and (6) is a sealing material that seals between the optical fiber cable (1) and the pipe (8).

The optical fiber cable penetration part according to the above-mentioned prior art has a sealing material (3) in the pipe (3) to improve the sealing performance when the optical fiber cable (11) is passed through the through hole provided in the 7 flange (2). 5), and the seal between the pipe (3rd and 7th langes (2)) is made of sealing material (4).

This seal structure prevents external mechanical forces from being applied to the optical fiber cable, which has lower mechanical strength than existing organic cables, and also protects the seal around the optical fiber cable.

However, with the conventionally known means described above, heat resistance, heat cycle resistance, etc. of the sealing material pose problems before the technology. Epoxy or silicone are the most common sealing materials for RIJs and have a track record of use. Lunge (2) and pipe (8)
Since thermal stress based on the difference in thermal expansion between the fiber optic cable 11 and the fiber optic cable 11 acts on the sealing portion, there is a risk of cracking of the seal.

Furthermore, in areas with high radiation levels, there is also the drawback that sealing performance deteriorates due to radiation deterioration.

This invention was made in order to eliminate the drawbacks of the prior art as described above, and instead of sealing by filling a sealing material, thermal expansion is performed between an optical fiber cable and a flexible member with a different coefficient of thermal expansion. Optical fiber couple with a sealing method that fundamentally improves heat resistance, heat cycle resistance, and radiation resistance by using a glass sealing element made by overlapping cylindrical glass sealing materials with different coefficients. The purpose is to provide a penetration part, and the emphasis is on reducing the thermal stress load on the seal part and optical fiber knurple by combining glass sealing materials with different coefficients of thermal expansion into a cylindrical shape. It is.

An embodiment of the present invention will be described below with reference to the drawings. Second
The figure shows a sectional view of the basic structure of the device of the present invention.

In the figure, (6) is an optical fiber couple or optical fiber rod, (7) is a flexible member such as Kovar, which is a metal with a coefficient of thermal expansion similar to that of the optical fiber knurple (6), and (8) is an optical fiber cable. A glass sealing member (9
) is a pipe, α0) is an end plate, and (11) is a spacer inserted between the optical fiber cable (6) and the end plate (11).

The principle and operation of the apparatus configured as described above will be explained using FIG. 8 and FIG. 4.

FIG. 8 shows an example in which the device of the present invention is applied to a light water reactor plant. In the figure, the optical fiber □-cable penetration section is connected to the reactor containment vessel wall (2) and concrete (
(b), it is necessary to form a sealing boundary between the reactor containment vessel inner space 06) and the outer space (17). For this reason, an airtight container is constructed of the first end plate (10a) and the second end plate (10b) via a sleeve attached to the wall of the containment vessel. 10a) (10b) and light 7 eye park, -
The seal with the pull or optical fiber quad (6) consists of a pipe (9), a flexible member (7) and a cylindrical overlapping glass sealing member (8).

According to this method, by employing a glass sealing member (8) in which cylindrical glass sealing materials with different thermal expansion coefficients are stacked together, an optical fiber table or an optical fiber iron (6) and a flexible member (7) are used. ), for example, it is possible to overcome the difference in thermal expansion coefficient with Kovar.

For this purpose, the containment vessel inner space 06) and the outer space αη
The seal structure prevents thermal stress on the seal even when there is a temperature difference between the two.

That is, the coefficient of thermal expansion can be changed step by step to absorb the difference in thermal expansion between the optical fiber iron (6) and the flexible member (7).

Furthermore, the difference in thermal expansion with the glass sealing member (8) due to the use of metal for the end plates (10a) (10b) and the pipe (9) is absorbed by the flexible member (7).

In addition, the space (18a) inside the optical fiber table penetration part
(18b) (see Figures 8 and 4), for example dry N
- If gas is sealed and the optical fiber coupe pressure is monitored using a pressure gauge, it is possible to check whether each seal is damaged or not. The spacer (1υ) installed between the pipe (9) and the optical fiber table or the optical fiber rod (6) is simply for preventing external mechanical force from being applied to the optical fiber cable, and is made of FRP, for example.

As described above, according to the present invention, the glass sealing part side (8) is adopted which uses a cylindrical glass sealing material which not only has excellent heat resistance but also has a different coefficient of thermal expansion in the sealing structure part. It is also characterized by superior radiation resistance compared to conventional material seals.

4th [i! 3 shows an embodiment for further improving reliability such as sealing performance of the optical fiber coupler penetrating portion.

In the figure, the optical fiber cape A /
(Since the single assembly 61 is welded or brazed to the end plate, its mechanical strength, especially earthquake resistance, can be improved.

In addition, the holes made in the nozzle base (b) make it possible to evaluate the sealing performance of each fiber optic cable assembly from the manufacturing stage to the on-site installation stage. ) and the end plate oOt, which facilitates maintenance and inspection work.

Although the above-mentioned embodiments have been described with reference to the application of the present invention to a light water reactor plant, it goes without saying that the invention can also be applied to fast breeder reactors, heavy water reactors, and the like.

As described above, according to the present invention, by employing a glass sealing member having a cylindrical glass sealing side with a different coefficient of thermal expansion and a flexible member in the optical fiber cable passing portion, it is possible to remove the conventional seal. Compared to the filling method, durability such as heat resistance, heat cycle resistance, and radiation resistance can be improved, and a highly reliable optical fiber table penetration part can be provided.

[Brief explanation of the drawing]

Fig. 1 is a structural sectional view of a conventional optical fiber cable penetration part, Fig. 2 is a basic structural sectional view of the optical fiber couple penetration part of the present invention, and Fig. 8 is a structural sectional view of the optical fiber cable penetration part of the present invention. FIG. 4 is a structural sectional view of an application example of the optical fiber cable penetration part of the present invention. In the figure, (6) is an optical fiber couple or optical fiber rod, (γ) is aJ flexible part, (8) is a glass sealing member that combines cylindrical glass and heavy materials with different coefficients of thermal expansion, and (9) ) is the pipe, OQ is the end plate, (Foundation) is the sleeve, ni) is the reactor containment vessel wall, 09) is the nozzle stand.
It's true. In the drawings, the same reference numerals indicate the same or corresponding parts. Figure 1 Figure 2 Figure 3 Figure 1. ￥ Commissioner's Palace 1, Incident Display Patent Application No. 67-69187 2,
Title of invention, optical fiber cable penetration part: 3. Relationship to the case of a person who engages in Nyama iE Patent applicant address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent address: Chiyoda, Tokyo Ward Marunouchi-1-2 No. 3 No. 6, Detailed explanation of the invention in the specification subject to amendment 6, Contents of amendment + 1) Changed the phrase "different from" in line 14 of page 8 of the specification to " It is corrected to ``different in stages.'' (2) On page 8, line 19, K, "differs in" is corrected to "differs in stages."that's all

Claims (2)

[Claims] (1) A pipe is inserted through the end plate, and cylindrical glass and heavy materials with different coefficients of thermal expansion are stacked on the iFl side of the pipe, the optical fiber cable or the optical fiber rod, and the glass is stacked with a heavy material. An optical fiber cable penetration part characterized by welding or brazing. (2) The optical fiber cable penetration part according to claim 1, characterized in that it is of a seal type in which a nozzle is provided between the pipe and the glass heavy element.