重大事故時に噴霧されるNaOH水溶液による原子力発電所用シリコーンゴム絶縁ケーブルの劣化

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2020/09/01

タイトル(英語): Degradation of Cables Insulated with Silicone Rubber for Nuclear Power Plants by an Aqueous Solution of NaOH Sprayed during a Severe Accident

著者名: 皆川　武史（原子力規制庁長官官房技術基盤グループ），池田　雅昭（原子力規制庁長官官房技術基盤グループ），渡辺　藍己（原子力規制庁長官官房技術基盤グループ），平井　直志（早稲田大学 材料技術研究所），大木　義路（早稲田大学 材料技術研究所／早稲田大学 共同原子力専攻／早稲田大学 電気・情報生命専攻）

著者名(英語): Takefumi Minakawa (Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority (S/NRA/R)), Masaaki Ikeda (Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority (S/NRA/R)), Aiki Watanabe (Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority (S/NRA/R)), Naoshi Hirai (RIMST, Waseda University), Yoshimichi Ohki (RIMST, Waseda University/CMNE, Waseda University/EEBS, Waseda University)

キーワード: 原子力発電所，重大事故，蒸気暴露，水酸化ナトリウム水溶液，ケーブル，シリコーンゴム　　nuclear power plant，severe accident，steam exposure，aqueous solution of NaOH，cable，silicone rubber

要約(英語): 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 ℃. 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.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.140 No.9 （2020） 特集：電気電子絶縁材料システムシンポジウム

本誌掲載ページ: 457-463 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/140/9/140_457/_article/-char/ja/