Probabilistic Risk Assessment (PRA) insights.

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Fitzpatrick, R

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Material type: Text

TextLanguage: ENG Publication details: DEC 1987Description: 142p., no refsReport number: A3796; BNL-NUREG-51931; Institutional/Corporate Body; NUREG/CR-4405Subject: EvaluationSubject: Four different Probabilistic Risk Assessments (PRAs) have been briefly reviewed with the broad objective of ascertaining what insights might be gained (beyond those already documented in the PRAs) by an independent evaluation. The effort was not intended to verify the specific details and results of each PRA but rather, having accepted the results, to see what they might mean on a plant-specific and/or generic level. The four PRAs evaluated were those for Millstone 3, Seabrook, Shoreham, and Oconee 3. Full detail reviews of each of these four PRAs have been commissioned by the NRC, but only two have been completed and available as further input to the study: the review of Millstone 3 by LLNL and the review of Shoreham by BNL. The review reported here focused on identifying the dominant (leading) initiators, failure modes, plant systems, and specific components that effect the overall core melt probability and/or risk to the public. In addition, the various elements of the methodologies employed by the four PRA-specific insights are presented within the report section addressing that PRA, and overall insights are presented in the summarySubject: Nuclear power plantsSubject: Nuclear reactor controlSubject: Risk assessment

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Evaluation

Four different Probabilistic Risk Assessments (PRAs) have been briefly reviewed with the broad objective of ascertaining what insights might be gained (beyond those already documented in the PRAs) by an independent evaluation. The effort was not intended to verify the specific details and results of each PRA but rather, having accepted the results, to see what they might mean on a plant-specific and/or generic level. The four PRAs evaluated were those for Millstone 3, Seabrook, Shoreham, and Oconee 3. Full detail reviews of each of these four PRAs have been commissioned by the NRC, but only two have been completed and available as further input to the study: the review of Millstone 3 by LLNL and the review of Shoreham by BNL. The review reported here focused on identifying the dominant (leading) initiators, failure modes, plant systems, and specific components that effect the overall core melt probability and/or risk to the public. In addition, the various elements of the methodologies employed by the four PRA-specific insights are presented within the report section addressing that PRA, and overall insights are presented in the summary