ふげん SCC 対策技術とその有効性確認調査について
Evaluation of effectiveness of SCC prevention technologies after long term operation at the “Fugen” Power Station
著者:
湯浅 豊隆 Toyotaka YUASA 阿部 輝宜 Teruyoshi ABE 中村 孝久 Takahisa NAKAMURA 明珍 宗孝 Munetaka MYOCHIN 高城 久承 Hisatsugu TAKAGI
発刊日:
公開日:
decommissioningFugen” Power StationSCC
概要
Suffered SCC (stress corrosion cracking) at the primary cooling system in 1980, the “Fugen” power station introduced the three preventive technologies immediately. After the upgrade of the plant, no SCC occurred during the operation period. We have inspected the actual structural materials of the “Fugen” power statio n on its decommissioning stage to evaluate effectiveness of SCC management technologies, which are combin ing material replacement, induction heating stress improvement (IHSI) to reduce the welding residual tensi le stress, and application of hydrogen addition to reduce oxygen in the water. No crack in the materials w as found by metallurgical structure observation. Moreover, judging from the analysis of residual stress an d the heat affected zone in the materials, the effectiveness of SCC management technologies was verified.
