OS1420 ニッケル基合金のBWR環境中疲労き裂進展速度線図の検討 : 第1報, Paris則形式によるき裂進展速度式の検討

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  • 小川 琢矢
    株式会社東芝電力・社会システム技術開発センター
  • 板谷 雅雄
    株式会社東芝電力・社会システム技術開発センター
  • 青池 聡
    株式会社日立製作所日立研究所
  • 長瀬 博
    日立GEニュークリア・エナジー株式会社
  • 米陀 英毅
    北陸電力株式会社原子力本部原子力部

書誌事項

タイトル別名
  • OS1420 Study on Fatigue Crack Growth Behavior for Ni-base Alloys in BWR Water Environment : 1^<st> report, Expressions in Paris Law Format

抄録

When the flaws are detected m nuclear components by in-service inspection, structural integrity assessment is one of the most important procedures to assume the safety and reliability of nuclear power plants. Fatigue crack growth analysis should be performed for the technical judgment on continuous operation based on the Rules on Fitness-for-Service for Nuclear Power Plants of the Japan Society of Mechanical Engineers Code (JSME FFS Code) when the cyclic loading would be assumed. However, fatigue crack growth analysis for BWR components consisted of Ni-base alloy is currently impossible since the fatigue crack growth rate curve for Ni-base alloy in BWR water environment is not prepared yet in the JSME FFS Code. In this study, fatigue crack growth tests in BWR water environment were performed for Ni-base alloy. And fatigue crack growth rate curve in Paris law format was evaluated. As a result, fatigue crack growth rate curve for weld metal and heat affected zone (HAZ) was formulated, respectively. And the values of ΔK_<th> for less than 1s of rise time were determined.

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