Abstract
Great East Japan Earthquake and subsequent a severe accident of Fukushima Daiichi nuclear power plants challenged us about various issues to our academic society which set risk analysis issue as a main subject for research activities. Through extremely rare experiences, we are expected to conduct interdisciplinary activities to improve risk management for low probability and high consequence (LPHC) disasters. From these points of views, the author mainly describe four aspects, re-examination of definition of risks, decision-making system or governance for risk management among various stakeholders, some challenging approaches on better management for ‘beyond assumption’ events, and consideration of complementary relationship between risk management and crisis management.
