Document: NUREG-0800
Document ID: 91ccd6ba-6094-458e-842b-ff5e6b11f635
Document Type: srp
Title: INTERNALLY GENERATED MISSILES (OUTSIDE CONTAINMENT)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070370.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.1
CFR Part: 
CFR Title: 

Content:
ith 22 regard to their function in achieving and maintaining a safe reactor shutdown condition or in preventing accidents or mitigating the consequences of such accidents. The single failure criterion is used in the analysis. The safety functions to be performed by the SSC in the various plant designs are essentially the same. However, the location and arrangement of the SSC and the methods used vary from plant to plant depending upon the individual design. The review identifies variations in plant designs that must be evaluated on an individual case basis. SSC that perform a safety function, or which by virtue of their failure could have an adverse effect on a safety function, should be protected from the effects of internally generated missiles. Regulatory DRAFT Rev. 3 - April 1996 3.5.1.1-4 Guide 1.115 position C.1 provides guidance on the SSC important to safety that should be protected.23 Missile protection provided for SSC important to safety is adequate if the protection is provided by one or more of the following: (1) locating the system or component in a missile-proof structure, (2) separating redundant systems or components for the missile path or range, (3) providing local shields and barriers for systems and components, (4) designing the equipment to withstand the impact of the most damaging missile, (5) providing design features to prevent the generation of missiles, (6) orienting missile sources to prevent missiles from striking equipment important to safety. The information provided in the SAR pertaining to SSC design bases and 24 criteria, system descriptions and safety evaluations, piping and instrumentation diagrams, station layout drawings, and system and component characteristic and classification tables are reviewed to identify potential sources of missiles and to determine the SSC that require protection in order to maintain their safety-related functions. The reviewer may use failure mode and effect analyses and the results of reviews by other