Study on evaluation method for potential impacts of "Natural Phenomena" on a HLW disposal system

Kawamura, Makoto; Oi, Takao ; Makino, Hitoshi ; Umeda, Koji; Niizato, Tadafumi  ; Ishimaru, Tsuneari ; Seo, Toshihiro 

Evaluation for potential impact of natural phenomena ("earthquakes and fault movement", "volcanism", "uplift, subsidence and denudation", and "climatic and sea-level changes") on a High-Level radioactive Waste (HLW) disposal system is an important issue in safety assessment. In order to develop the perturbation scenario considering diverse and complex impact of natural phenomena comprehensively, it is important to identify the key factors to easily classify and organize these impacts and relate these factors with the system performance. In this method, a series of work to construct scenarios is divided into pieces to facilitate to elicit the features of potential impact of natural phenomena on a HLW disposal system and is organized to create reasonable scenarios with consistency, traceability and adequate conservativeness within realistic view.