Variation of radiological consequences under various weather conditions

Stratified sampling method of determining weather sequences is widely used in Probabilistic Safety Assessment Level-3 calculations with an intention to predict the complete spectrum of the accident consequences. Intensive calculations were performed for every weather bin in order to get a general view of consequence variation in response to the indices used in the weather bin categorization procedures. The results of this case study demonstrated that there must be important factors, such as time-integrals of meteorological parameters other than initial weather conditions, which might influence the consequences for a given accident. Further improvement is needed for the choice of criteria for grouping weather sequences in the stratified sampling scheme. (author)