Document: NUREG-0800
Document ID: 1dabf375-d973-4499-a224-cf6b3b2a0de9
Document Type: srp
Title: INTERNALLY GENERATED MISSILES (OUTSIDE CONTAINMENT)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070370569.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.1
CFR Part: 
CFR Title: 

Content:
ernatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 1. Review of the effects of internally-generated missiles on structures is a primary responsibility under SRP Section 3.5.3. The first objective in the review of SSCs requiring protection against internally-generated missiles is to determine whether the equipment is needed to perform a safety function. Some structures and systems are designed as entirely safety-related, others with safety-related portions, and others as not needed for safety. To determine the safety category, the SSCs are evaluated for their functions in achieving safe reactor shutdown conditions, preventing significant uncontrolled release of radioactivity, preventing accidents, or mitigating their consequences. The reviewer evaluates such input as required for completion of this review. The safety functions of the SSCs in the various plant designs are essentially the same; however, the location and arrangement of the SSCs and the methods used vary from plant to plant depending upon individual design. The reviewer must evaluate variations in plant designs as individual cases. SSCs that perform safety functions or which by virtue of their failure could affect a safety function adversely should be protected from the effects of internally-generated missiles. RG 1.115 position C.1 provides guidance on the SSCs important to safety that should be protected. 2. The SAR information on SSC design bases and criteria, system descriptions and safety evaluations, piping and instrumentation diagrams, station layout drawings, and system and component characteristic and classification tables are reviewed for potential sources of missiles and for SSCs requiring protection to maintain their safety-related functions. The reviewer may use failure mode and effect analyses and the results of reviews by other branches in evaluating SSCs to identify those requiring protection from internally-generated