+. U.S. NUCLEAR REGULATORY COMMISSION ' STANDARD REVIEW PLAN / 4 OFFICE OF NUCLEAR REACTOR REGULATION 3.5.1.2 INTERNALLY GENERATED MISSILES (INSIDE CONTAINMENT) REVIEW RESPONSIBILITIES Primary- Auxiliary Systems Branch (ASB) Secondary- None

The ASB review of the structures, systems, and components (SSC) to be protected from internally generated missiles (inside containment) to assure conformance with the requirements of General Design Criterion 4 includes all SSC within the contain-ment and the containment itself. The review includes internally generated missiles associated with component overspeed failures, missiles that could originate from high energy fluid system failures, and missiles due to gravitational effects. The ASB with the requested assistance of the Containment Systems Branch (CSB) and the Reactor Systems Branch (RSB) reviews the functional operations and performance requirements for structures, systems,'and components inside containment and identi-fies which of the operations are necessary for the safe shutdown of the reactor facility in the event of an accident or other circumstances that might result in an internally generated missile, or for the mitigation of the effects of loss-of-coolant or other accidents. Safety-related SSC are reviewed with respect to their capability to perform functions required for attaining and maintaining a safe shut-down condition during such accident conditions. The review of internally generated missile protection includes the following: 1. Structures, systems or portion of systems, and components requiring protection from internally generated missiles and the methods of protection provided against such missiles. 2. Credible primary missiles including, valve hardware, retaining bolts, relief valves parts, instrument wells and reactor vessel seal rings (PWR). 3. Credible secondary missiles generated as a result of impact with primary missiles