MODELING OF TSUNAMI SCENARIOS FOR REFINEMENT OF FRAGILITY ASSESSMENT FOR NUCLEAR POWER PLANTS

Abstract

 In this study, we propose and validate a method for modeling tsunami scenarios, which are the input in tsunami fragility assessment for nuclear power plants. Although one of methods to identify plant accident scenarios is to cover a wide variety of inundation scenarios, there are hundreds to thousands of tsunami sources for a plant, therefore, it is difficult to conduct inundation analyses on the site to all of them. In our method, to model the tsunami scenarios, the hazard contribution for each tsunami source was calculated, significant tsunami sources for the site are selected, and inundation analyses are conducted. Furthermore, the selected tsunami sources are grouped based on their features. Statistical studies for the features of tsunami sources and the variability of the inundation scenarios revealed the validation of our method and the relationship between the tsunami sources and inundation characteristics.