Insulation Performance of Safety-related Cables for Nuclear Power Plants under Simulated Severe Accident Conditions

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: 2019/02/01

タイトル(英語): Insulation Performance of Safety-related Cables for Nuclear Power Plants under Simulated Severe Accident Conditions

著者名: Takefumi Minakawa (Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority (S/NRA/R)/Cooperative Major in Nuclear Energy, Waseda University), Masaaki Ikeda (Regulatory Standard and Research Department, Secretariat of Nucle

著者名(英語): Takefumi Minakawa (Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority (S/NRA/R)/Cooperative Major in Nuclear Energy, Waseda University), Masaaki Ikeda (Regulatory Standard and Research Department, Secretariat of Nuclear Regulation Authority (S/NRA/R)), Naoshi Hirai (Research Institute for Materials Science and Technology, Waseda University), Yoshimichi Ohki (Cooperative Major in Nuclear Energy, Waseda University/Research Institute for Materials Science and Technology, Waseda University/Department of Electrical Engineering and Bioscience, Waseda University)

キーワード: nuclear power plant，severe accident，silicone rubber，ethylene propylene diene rubber，electrical insulation resistance

要約(英語): Cables used as severe accident management equipment in nuclear power plants are required to maintain their intended electrical insulating function under severe accidents (SAs) after having aged in normal operating conditions during their service life. To examine the electrical insulation behavior of the cables under SA environmental conditions, two types of cables were first pre-aged by simultaneous thermal and radiation exposure in accordance with the procedure prescribed in “The Guide for Ageing Evaluation of Cables for Nuclear Power Plants” (JNES-RE-2013-2049, 2014), irradiated to simulate radiation exposure during SA, and then subjected to two steam exposure conditions: 155℃ and 0.444 MPaG for 14 days, and 200℃ and 0.620 MPaG for 7 days. In addition, electrical insulation resistance was measured for the cables during the steam exposure. As a result, all the cables passed the voltage withstand test conducted in accordance with JIS C 3005, which is prescribed as a final cable evaluation test in the JNES Guide for the design basis accident. It was found that the minimum insulation resistance per meter of the cables during the steam exposure at 155℃ is around 108 Ωm, confirming that the cables have sufficient insulation performance. In contrast, the resistance falls to as low as 105 Ωm during the test at 200℃ due to the increase in leak current.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.139 No.2 （2019） 特集：2017 International Symposium on Electrical Insulating Materials

本誌掲載ページ: 54-59 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/139/2/139_54/_article/-char/ja/