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Motivated by learning from experience and exploiting existing knowledge incivil nuclear operations, we have developed in-house generic PSA models forpressurized and boiling water reactors. The models are computationally light,handy, transparent, user-friendly, and easily adaptable to account for majorplant-specific differences. They cover the common internal initiating events,frontline and support systems reliability and dependencies, human-factors,common-cause failures, and account for new factors typically overlooked in manydeveloped PSAs. For quantification, the models use generic US reliability data,precursor analysis reports and studies, the ETHZ Curated Nuclear EventsDatabase, and experts' opinions. Moreover, uncertainties in the mostinfluential basic events are addressed. The generated results show goodagreement with assessments available in the literature with detailed PSAs. Weenvision the models as an unbiased framework to measure nuclear operationalrisk with the same "ruler", and hence support inter-plant risk comparisons thatare usually not possible due to differences in plant-specific PSA assumptionsand scopes. The models can be used for initial risk screening,order-of-magnitude precursor analysis, and other research and pedagogicapplications especially when no plant-specific PSAs are available. Finally, weare using the generic models for large-scale precursor analysis that willgenerate big picture trends, lessons, and insights.

Generic and adaptive probabilistic safety assessment models: Precursor analysis and multi-purpose utilization