NUREG/CR-6850, Volume 1 - NRC

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ApproachDeveloping this fire PRA methodology document involved a consensus process designed to fullydebate and build consensus on past methodological issues. Two technical development teamswere assembled, one by EPRI and the second by RES. Each team provided a full complement ofexperts covering all aspects of the analysis. These experts worked together to develop an overallanalysis framework and specific instructions for key aspects of the fire PRA.Technical differences were aired in sometimes-lively discussions. The technical exchangeprocess was designed to seek consensus where possible. However, the process also allowed RESand EPRI to maintain differing technical views in cases where consensus could not be reached.In practice, this did not prove necessary. The documented methods do, in all cases, represent aconsensus view of the two technical development teams.Another key aspect of the project involved participation of the commercial nuclear powerindustry in review, demonstration, and, to a lesser extent, development of the recommendedmethods. An industry peer-review panel was formed from the six non-pilot utility participants inthis program. Two nuclear power plants participated as pilot plants and supported demonstrationstudies conducted jointly by the EPRI and RES technical development teams. A third nuclearpower plant participated as an independent pilot plant, exercising the proposed methodsindependently and providing feedback to the technical development teams.ResultsThe documented fire PRA method reflects state-of-the-art fire risk analysis approaches.Methodological issues raised in past fire risk analyses, including individual plant examination ofexternal events (IPEEE) fire analyses, have been addressed to the extent allowed by the currentstate-of-the-art and overall project scope. Methodological debates were resolved through aconsensus process between experts representing both EPRI and RES. The consensus processincluded a provision allowing both EPRI and RES to maintain differing technical positions ifconsensus could not be reached. No cases were encountered where this provision was invoked.While the primary objective of the project was to consolidate existing state-of-the-art fire PRAmethods, in many areas, the newly documented methods represent a significant advance overpreviously documented methods. In several areas, this project has, in fact, resulted in newmethods and approaches. Such advances typically relate to areas of past methodological debate.EPRI PerspectiveThis report provides the single most complete and comprehensive methodology for conducting afire PRA to date. Two aspects of the approaches described here are especially unique. First, themethodology has been developed based on a consensus process involving both EPRI and RES.Second, the methods specifically address and resolve previously identified methodologicalissues. Clearly, these fire PRA methods should offer a stable basis for proceeding with riskinformedregulatory approaches to fire protection regulatory compliance.KeywordsFireProbabilistic Risk Assessment (PRA)Nuclear Plant Fire SafetyFire RiskRisk AnalysisRisk-Informed Regulationxii
PREFACEThis report is presented in two volumes. <strong>Volume</strong> 1, the Executive Summary, provides generalbackground and overview information including both programmatic and technical, and projectinsights and conclusions.<strong>Volume</strong> 2 provides the detailed discussion of the recommended approach, methods, data andtools for conduct of a Fire PRA. This information is structured in 18 chapters that describe eachof the project technical tasks as they are shown in Figure 1.xiii
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