Design Basis External Events
Design Basis External Events : The external event(s) or combination(s) of external events considered in the design basis of all or any part of a facility. Design Basis Probability Value DBPV: A value of the annual probability for a particular type of event to cause unacceptable radiological consequences. It is the ratio between the screening probability level and the conditional probability value. The term is used in the detailed event screening process for site evaluation
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