"A % U.S. NUCLEAR REGULATORY COMMISSION STANDARD REVIEW PLAN OFFICEOF NUCLEAR REACTOR REGULATION 3.5.1.1 INTERNALLY GENERATED MISSILES (OUTSIDE CONTAINMENT) REVIEW RESPONSIBILITIES Primary- Auxiliary Systems Branch (ASB) Secondary- None

The ASB reviews all structures, systems, and components (SSC) provided to support the reactor facility that require protection from internally generated missiles (outside containment) to assure conformance with the requirements of General Design Criterion 4. The review concerns missiles that could result from in-plant compo-nent overspeed failures and high-pressure system ruptures. The ASB reviews the functional operations and performance requirements for all structures, systems, and components outside containment and identifies the SSC that are necessary for the safe shutdown of the reactor facility and the SSC whose fail-ure could result in a significant release of radioactivity. All SSC will be re-viewed to assure adequate protection from internally generated missiles if the SSC are necessary to perform functions required for attaining and maintaining-a safe shutdown condition or if the SSC are necessary to mitigate the consequences of an accident. The review of internally generated missile protection includes the following: structures, systems or portion of systems, and components that require protection from internally generated missiles are identified; pressurized components and systems are reviewed to determine their potential for generating missiles such as valve bonnets and hardware retaining bolts, relief valve parts, and instrument wells; high speed rotating machinery are reviewed to determine their potential for generating missiles from component overspeed or failure, such as failure of the pump itself (resulting from seizure), pump or component parts, and rotating seg-ments (e.g., impellers and fan blades). If safety-related systems or components are located in areas containing nonsafety-related SSC, then the nonsafety-related SSC are reviewed with respect to interna