実機照射材を用いた照射誘起応力腐食割れ研究


英字タイトル:
Research on Irradiation Assisted Stress Corrosion Cracking with Materia1s irradiated at Commercial Plant
著者:
西岡 弘雅 Hiromasa NISHIOKA 福谷 耕司 Koji FUKUYA 藤井 克彦 Katsuhiko FUJII 橘内 裕寿 Yuji KITSUNAI
発刊日:
公開日:
カテゴリ: 第10回
キーワードタグ:

概要

(Times New Roman 10pt) should be about 150 words. Irradiation assisted stress corrosion cracking (IASCC) is one of the aging issues of LWR. INSS has been conducted the research on IASCC using flux thimble tube irradiated up to 73dpa in commercial PWR since 1990s. The increase of strength and hardness by microstructure change and microchemistry change such as grain boundary segregation were investigated. The increase of hardness and grain boundary segregation seem to be an important factor for IASCC initiation. The highly irradiated stainless steels failed at about half of the yield strength in simulated PWR primary water. IASCC initiation threshfold stress decreased with dissolved hydrogen concentration.


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