国内原子力発電所トラブル情報分析に基づく疲労損傷事象に対する安全性向上に関する検討について
Study of fatigue failures to improve safety based on the analyses of failure database in Japanese nuclear power plant
著者:
松下 幹弥 Mikiya MATSUSHIMA 中村 隆夫 Takao NAKAMURA 新井 拓 Taku ARAI
発刊日:
公開日:
failure databasefatigue failurefluid vibrationfretting fatiguehigh-cycle fatiguelow-cycle fatiguemaintenance programmechanical vibrationNUCIAsafety evaluation in system level
概要
After Fukushima-Daiichi accident, nuclear power plants are highly requested to enhance safety against severe accident. It is important to prevent fatigue failure for operating nuclear power plants, especially pressure boundary of compon ts to ensure safety. This paper studies the failure database of nuclear power plant in Japan (NUCIA) and extracts the events caused by fatigue failure. Fatigue failure can be classified according to fatigue mechanism such as mechanical vibration, fluid vibration, high-cycle thermal fatigue, low-cycle fatigue, and fretting fatigue. The study focuses on the classification of significance in safety function of the system, the trend and the countermeasures taken for each kind of fatigue failure. The detailed analysis of fatigue failure in safety-related components proposes important modi fication of maintenance program and screening criteria of components to be evaluated to ensure safety in system level.
