IAEA-TECDOC Ser.

The publication provides an approach for achieving the technical consistency of Probabilistic Safety Assessments (PSA) needed to support reliably various PSA applications. The approach involves the consideration of a set of technical features, called attributes, of the major PSA elements relevant for various applications. The document covers a Level 1 internal events at-power PSA. Nine PSA elements characterizing the major PSA tasks were defined. For each PSA element, a set of general attributes needed for all PSA applications and special attributes needed for specific PSA applications were elaborated. A comprehensive list of PSA applications was compiled. For each PSA application, a brief description of the purpose of the application and the way the PSA can be used to support it were provided along with the information on what PSA results and metrics can be used in the decision making process. The document provides a mapping of the special attributes to the considered PSA applications.