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Proceedings Paper

Development Of The Nuclear Optical Penetration
Author(s): K. Inoue; K. Koike; Y. Imada
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Paper Abstract

We have developed the nuclear optical penetration to be incorporated in the wall penetration of the shell to introduce a data transmission system using optical fibers into a nuclear power plant with a pressurized water reactor. Radiation-induced coloration in optical glass seriously affects transmission characteristics of optical fibers, whereas it has been revealed that the pure-silica core optical fiber without any dopant in the core has wide applicability in radiation fields thanks to its very low radiation-induced attenuation. The wall penetration of the shell should have airtightness and resistivity to heat, vibration, and pressure, let alone radiation, excellent enough to be invariable in data transmission efficiency even when subjected to severe environmental tests. The sealing modules of this newly developed nuclear optical penetration are hermetically sealed. The gap between the optical fiber rod (100 pm in core diameter and 5 mm in rod diameter) and stainless steel tube is sealed with lamingted glass layer. As the result of He gas leakage test, high airtightness of less than 10 cc/sec was achieved. No thermal deformation of the core was caused by sealing with laminated glass layer, nor was observed transmission loss. Then the sealiing modules were subjected to the irradiation test using 60 Co gamma ray exposure of 2 x 10 rads. Though silica glass layer supporting the fiber rod and sealing glass portion turned blackish purple, transparency of the fiber was not affected. Only less than 0.5 dB of connecting loss was observed at the connecting point with the optical fiber cable. The sealing modules were also found to have resistivity to vibration and pressure as excellent as that of existing nuclear electric penetrations. We expect the nuclear optical fiber penetration will be much effective in improving reliability of data transmission systems using optical fibers in radiation fields.

Paper Details

Date Published: 15 October 1984
PDF: 7 pages
Proc. SPIE 0506, Fiber Optics in Adverse Environments II, (15 October 1984); doi: 10.1117/12.944904
Show Author Affiliations
K. Inoue, Dainichi-Nippon Cables, Ltd. (Japan)
K. Koike, Dainichi-Nippon Cables, Ltd. (Japan)
Y. Imada, Dainichi-Nippon Cables, Ltd. (Japan)

Published in SPIE Proceedings Vol. 0506:
Fiber Optics in Adverse Environments II
Roger A. Greenwell, Editor(s)

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