Probabilistic Tsunami Hazard Assessment for South-Eastern Coastal Area of Korea (II): Application

A probabilistic tsunami hazard assessment is conducted for the Kori nuclear power plant site using the logic tree proposed by Jho and Yoon (2025). The logic tree is developed by assembling two logic trees associated with the faults along the east rim of East Sea and the subducting belt along the Ryukyu Trench. The logic tree employed in this study reflects the uncertainties associated with the magnitude and recurrence period of earthquake, the orientation of fault, the dip-angle, the asperity of fault, and the scaling laws. On top of this the uncertainties due to the standard deviation and the cut-off of tsunami height probability distribution are also taken into consideration. Using the average annual exceedance probability curves obtained for the stations around the Kori NPP site the safeties related to the ground elevation of the site and the essential service water pump facility are investigated for the tsunamis of 10<sup>-6</sup> annual exceedance probability imposed as the regulation guide by the U.S. Nuclear Regulatory Commission.