J1010104 原子力施設の免震技術の開発 : 渡り配管の確率的破損評価手法について([J101-1]耐震・免震・制震 耐震(1))

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  • J1010104 Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities : Probabilistic Failure Assessment Method of Crossover Piping

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In this paper, the probabilistic failure assessment method for crossover piping is addressed. The crossover piping in this study having universal flexible joint for low temperature and low pressure piping system, is installed between seismically isolated and non-isolated building; the reactor building is only isolated using seismic isolation systems whereas the turbine building is non-isolated. The crossover piping is designed to meet the large displacement for seismic event. It is known that the major effect on such crossover piping by seismic event is fatigue damage. The failure probability by fatigue is evaluated as followings. The equivalent numbers of cycles for maximum stress (SR) on universal flexible joint is calculated by Rainflow-counting method. The SRs are distributed on two fatigue curves as "Design fatigue curve" by JSME and "Best-Fit fatigue curve". When the distributions are on the former curve can be read as 99% confidence with enough design margins and the distributions are on the latter curve can be read as 50% probabilistic failure of bearing force. In conclusion, those failure probabilities distributions can be fit to fragility curve.

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  • 年次大会

    年次大会 2014 (0), _J1010104--_J1010104-, 2014

    一般社団法人 日本機械学会

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