[1P08-13] Seismic Counter Measures against Cliff Edges

[1P10] Development of seismic counter measures against cliff edges for enhancement of comprehensive safety of nuclear power plants

Part 13 Identification and evaluation against cliff edges for nuclear building system

*Akemi Nishida¹, Byunghyun Choi¹, Hidemasa Yamano¹, Tsuyoshi Takada² (1. JAEA, 2. The Univ. of Tokyo)

Keywords:seismic risk, knowledge oriented cliff edges, Building system, three-dimensional detailed model, base-isolated system

In this research, the seismic safety of nuclear power plants (NPP) is treated as a system in which the various cliff edge effects are identified and quantified based on the concepts of risk and defense in depth. A methodology is then developed for avoiding these cliff edge effects. In order to examine how the cliff edge state specified and evaluated in the seismic response analysis of the building system, we investigated the seismic isolation mechanism related to physical cliff edges and the modeling effects of the building system related to knowledge based cliff edges. In this report, we describe the knowledges obtained as the results of examination on the specification of the cliff edge state and its avoiding technique from the viewpoint of fragility evaluation.