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Tutorial on Probabilistic Risk Assessment (PRA)

Tutorial on Probabilistic Risk Assessment (PRA)P-101: Risk-Informed Regulation for Technical Staff2 Risk assessments include identification and analysis Initiating events Circumstances that put a nuclear plant in an off-normal condition Safety functions Functions designed to mitigate the initiating event Accident sequences Combination of safety function successes and failuresthat describe the accident after an initiator Successful response is that the plant transitions to safe, stable end-state for specified period of time We use a PRA model to look at the frequency and consequences of NOT achieving a safe, stable end-state2. Use of PRA ModelsWhat is a PRA?P-101: Risk-Informed Regulation for Technical Staff3 What is the technical basis for the PRA model? The PRA model is constructed to model the as-built, as-operated plant Multiple sources of information from the traditional engineering disciplines, including: Plant design information Thermal hydraulic analyses of plant response System drawings and performance criteria Operating experience data Emergency, abnormal, and system operating procedures Maintenance practices and procedures2.

Tutorial on Probabilistic Risk Assessment (PRA) P-101: Risk-Informed Regulation for Technical Staff 2 ... – Probability that the function will fail, derived from the cutsets and the failure probabilities of the basic events therein 2. Use of PRA Models VALVE A TANK PUMP A

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