Nuclear Engineering and Technology

  • 제51권2호
  • /
  • Pages.607-617
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  • 2019
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Logic tree approach for probabilistic typhoon wind hazard assessment

  • Choun, Young-Sun (Structural and Seismic Safety Research Team, Korea Atomic Energy Research Institute) ;
  • Kim, Min-Kyu (Structural and Seismic Safety Research Team, Korea Atomic Energy Research Institute)
  • 투고 : 2018.03.21
  • 심사 : 2018.11.12
  • 발행 : 2019.04.25
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초록

Global warming and climate change are increasing the intensity of typhoons and hurricanes and thus increasing the risk effects of typhoon and hurricane hazards on nuclear power plants (NPPs). To reflect these changes, a new NPP should be designed to endure design-basis hurricane wind speeds corresponding to an exceedance frequency of $10^{-7}/yr$. However, the short typhoon and hurricane observation records and uncertainties included in the inputs for an estimation cause significant uncertainty in the estimated wind speeds for return periods of longer than 100,000 years. A logic-tree framework is introduced to handle the epistemic uncertainty when estimating wind speeds. Three key parameters of a typhoon wind field model, i.e., the central pressure difference, pressure profile parameter, and radius to maximum wind, are used for constructing logic tree branches. The wind speeds of the simulated typhoons and the probable maximum wind speeds are estimated using Monte Carlo simulations, and wind hazard curves are derived as a function of the annual exceedance probability or return period. A logic tree decreases the epistemic uncertainty included in the wind intensity models and provides reasonably acceptable wind speeds.

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