Document: NUREG-0800
Document ID: 4e771d51-141e-46e6-8ec9-fd098a4b1db7
Document Type: srp
Title: STRUCTURES, SYSTEMS, AND COMPONENTS TO BE PROTECTED FROM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0704/ML070460362.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.2
CFR Part: 
CFR Title: 

Content:
hether the applicant's list of SSCs that require protection from externally-generated missiles is complete and meets the acceptance criteria in subsection II of this SRP section. For operating license applications, the procedures are used to verify whether the construction permit stage list continues to be complete and applicable or has been supplemented appropriately. 1. The first step in the review is to verify the identification of the safety-related SSCs and whether they are safety-related in their entirety or only in portions. The safety category is determined by evaluation of the facility SSCs as to their necessity in achieving and maintaining safe reactor shutdown or for performing accident prevention or mitigation functions. The safety analysis report information on SSC design bases, design criteria, descriptions and safety evaluations together with the system and component characteristic tables and safety classification tables are reviewed for SSC safety functions. Generally, the safety functions of the SSCs in various designs remain essentially the same; however, the location or arrangement of the SSCs and the methods used vary from plant to plant depending upon individual designers. 2. The second step in the review is to determine which SSCs or SSC portions require protection against externally-generated missiles. The reviewer uses engineering judgment and the results of failure modes and effects analyses in conjunction with the results of reviews under other SRP sections for specific SSCs in this determination. Most safety-related systems are located within structures resistant to external missiles by design for other purposes (e.g., primary containment) or because of specific construction to withstand missiles. Systems and components within such structures are considered adequately protected. The reviewer concentrates attention on safety-related SSCs outside such structures and on penetrations and access openings in them. Essential service water piping