Revision of the AESJ Standard for Seismic Probabilistic Risk Assessment (3) Fragility Evaluation

This paper introduces the following key issues on the fragility evaluation of SSCs in revision of the AESJ Standard for Seismic Probabilistic Risk Assessment. 1. Requirements for seismic induced other risk evaluations such as tsunami are clarified. For instance, the influence of structural damage due to main shock is considered as necessary to evaluate the realistic response by tsunamis after main shock. 2. Most recent findings are reflected based on the actual damage and simulation analyses of some earthquakes beyond design basis earthquake after 2007. For instance, seismic response analytical model is better suited for the realistic response evaluation up to damage limit paying attention to three dimensional responses of buildings / structures and its effect on equipment important to safety based on the seismic simulation analyses with observed records and usage experience. Floor deformation, torsion and rocking etc. are considered as three dimensional responses. 3. Requirements for the fragility evaluation of severe accident management equipment, its passageway, spent fuel pool and isolated important building are clarified based on the findings of Fukushima accident and so on. 4. Requirements for the fragility evaluation of aftershocks other than main shock and soil deformation due to fault displacement are clarified.