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Probabilistic safety assessment of off-site power system under typhoon considering failure correlation between transmission towers

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  • Kim, Gungyu
  • Kwag, Shinyoung
  • Eem, Seunghyun
  • Hahm, Dae-gi
  • Park, Jin Hee

Abstract

High-intensity typhoons can cause failure to the structures, systems, and components of nuclear power plants (NPPs) and off-site power systems. Instances have occurred where failure of the off-site power system caused by typhoons has affected NPPs. The off-site power system has been in cases where a typhoon failed multiple transmission towers. In Korea, transmission towers have similar design criteria and material properties and experience similar wind characteristics, leading to a correlation in their failure probabilities. Assuming independent or totally dependent failure probabilities among the transmission towers is unrealistic. For a realistic PSA of the off-site power system due to typhoon-induced high winds, it is necessary to consider an appropriate failure correlation. This study performed a PSA of an off-site power system due to typhoon-induced high winds, considering the failure correlation between transmission towers. The failure correlation between transmission towers based on distance was calculated. The wind fragility of the off-site power system was convolved with the typhoon-induced high-wind hazard at the Kori NPP to calculate the probability of the NPP losing its power supply. Thus, applying the failure correlation of typhoon-induced high winds to the PSA of the off-site power system is considered realistic.

Suggested Citation

  • Kim, Gungyu & Kwag, Shinyoung & Eem, Seunghyun & Hahm, Dae-gi & Park, Jin Hee, 2025. "Probabilistic safety assessment of off-site power system under typhoon considering failure correlation between transmission towers," Reliability Engineering and System Safety, Elsevier, vol. 254(PB).
    • Handle: RePEc:eee:reensy:v:254:y:2025:i:pb:s0951832024007087
    DOI: 10.1016/j.ress.2024.110637
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    References listed on IDEAS

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