Degradation of cables insulated with silicone rubber for nuclear power plants by an aqueous solution of naoh sprayed during a severe accident

Takefumi Minakawa, Masaaki Ikeda, Aiki Watanabe, Naoshi Hirai, Yoshimichi Ohki

研究成果: Article査読

抄録

Some safety-related cables installed in boiling water reactors in Japan are likely to be exposed to an aqueous solution of sodium hydroxide (NaOH) during a severe accident (SA). For examining the degradation mechanism of cables insulated with silicone rubber (SiR) by the aqueous solution of NaOH sprayed during a SA, various tests to simulate a SA were conducted. Namely, after sample cables were pre-aged to simulate the degradation induced in the normal operating conditions, they were irradiated by gamma rays to simulate radiation exposure during a SA. Then, their insulated cores were immersed in the aqueous solution of NaOH with a pH of around 13 at 170 °C. It was found that the scission of siloxane chains in SiR on the surface of insulation and the generation of silicon dioxide occur with the increase in aging time and that the cable insulation is eroded from their surface contacted with the aqueous solution of NaOH.

本文言語English
ページ(範囲)457-463
ページ数7
ジャーナルIEEJ Transactions on Fundamentals and Materials
140
9
DOI
出版ステータスPublished - 2020 9 1

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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