重大事故模擬環境に暴露したエチレンプロピレンジエンゴム絶縁ケーブルの劣化状態分析

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: 2019/09/01

タイトル(英語): Aging State Analysis of Cables Insulated with Ethylene Propylene Diene Rubber Exposed to Simulated Severe Accident Conditions

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／早稲田大学共同原子力専攻），池田　雅昭（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（早稲田大学共同原子力専攻／早稲田大学材料技術研究所／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)/CMNE, Waseda University), Masaaki Ikeda (Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority (S/NRA/R)), Naoshi Hirai (RIMST, Waseda University), Yoshimichi Ohki (CMNE, Waseda University/RIMST, Waseda University/EEBS, Waseda University)

キーワード: 原子力発電所，重大事故，蒸気暴露，安全系ケーブル，エチレンプロピレンジエンゴム　　nuclear power plant，severe accident，steam exposure，safety-related cable，ethylene propylene diene rubber

要約(英語): Several cables in safety-related systems in nuclear power plants (NPPs) are required to perform their safety functions in severe accident conditions even after they experience inservice aging. For such cables, the behavior of their insulation under the accidents is a matter of concern. In this research, after cables insulated with ethylene propylene diene rubber (EPDM) were preconditioned by exposing them to concurrent heat and radiation to simulate aging that would be incurred in their service life in normal operating condition of NPPs, they were exposed to radiation and high temperature steam that simulate harsh accident conditions postulated inside the primary containment vessel. The changes in chemical structures and thermal and mechanical properties were analyzed by Fourier transform infrared spectroscopy, thermogravimetry, and indentation hardness measurements. As a result, it has been confirmed that the pre-aging and radiation exposure induce chain scission by oxidation and cross-linking, whereas the steam exposure causes bleedout of additives compounded in EPDM.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.139 No.9 （2019） 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: 380-386 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/139/9/139_380/_article/-char/ja/