ASME RA-SA

Abstract

<strong>SCOPE AND APPLICABILITY</strong> <br>This Standard establishes requirements for a Level 1 PRA of internal and external events for all plant operating modes (low power and shutdown modes will be included at a future date). In addition, this Standard establishes requirements for a limited Level 2 PRA sufficient to evaluate large early release frequency (LERF). The only initiating events explicitly excluded from the scope are accidents resulting from purposeful humaninduced security threats (e.g., sabotage). This Standard applies to PRAs used to support applications of riskinformed decision-making related to design, licensing, procurement, construction, operation, and maintenance. These requirements are written for operating power plants. They may be used for plants under design or construction, for advanced LWRs, or for other reactor designs, but revised or additional requirements may be needed.