Selection method of severe accidents at nuclear fuel cycle facilities for which the countermeasures should be considered and remaining issues

On the basis of lesson from Fukushima Daiichi nuclear disaster, in the Severe Accident Study Working Group for the Nuclear Fuel Cycle Facilities of the Reprocessing and Recycle Technology Division of the Atomic Energy Society of Japan, the selection method of severe accidents for nuclear fuel cycle facility, which may occur attributable to inner and external events, was investigated from scientific and technical point of view. Risk analysis methods, which has been applied for nuclear facilities, were reviewed and selection method of severe accidents, which should be investigated, was proposed. In order to confirm feasibility of the method, possibility of occurrence and evaluation case of influence of accidents were investigated. Furthermore, remaining technical issues for applying the risk analysis method and evaluation results on selection of severe accidents was mentioned. (author)