15.3 Simplified PRA Procedure
Dr. Micheal G. Stamatelatos (National Aeronautics and Space Administration, NASA) presentation, “Risk Assessment and Management, Tools and Applications,” summarized a methodology flow for PRA. These steps are summarized as follows:
1. identification of end states of interest;
2. system familiarization and data collection;
3. identification, selection, and screening of initiation events;
4. definition and modeling of all scenarios linking each initiating event to the end states;
5. modeling of pivotal events;
6. risk quantification for each pivotal event and scenario; risk aggregation for all like end states;
7. full uncertainty analysis; sensitivity analysis as needed;
8. risk importance ranking (2).
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