ANS RA-S-1.1 PDF download

ANS RA-S-1.1 – Standard for Level 1/Large Early Release Frequency Probabilistic Risk Assessment for Nuclear Power Plant Applications – ANSI/ASME/ANS RA-S-1.1-2022

This standard states requirements for a Level 1 PRA of internal and external hazards while at-power for the evaluation of core damage frequency. In addition, this standard states requirements for a limited Level 2 PRA sufficient to evaluate large early release frequency. The only hazards explicitly excluded from the scope are accidents resulting from purposeful human-induced security threats (e.g., sabotage, terrorism). These requirements are written for operating light water reactor (LWR) power plants. This standard may be used for LWR plants under design or construction or for advanced LWRs but revised or additional requirements may be needed.