Document: NUREG-0800
Document ID: 96afb1d6-6ce9-41e4-b4ec-1fc7747bc0b2
Document Type: srp
Title: Revision 8 – January 2021
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML2033/ML20339A647.pdf
Revision Date: 2023-05
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
safety-significant SSCs. Acceptance Criteria for Safety-Significance Determinations: NRC technical reviewers should find an applicant’s safety-significance determination acceptable if it reasonably conforms to the criteria below. If the applicant uses risk insights (e.g., from a site-specific PRA) to demonstrate that an SSC is less safety-significant than these criteria would indicate, the staff should review these on a case-by-case basis. The following acceptance criteria applies: a. high safety significance: safety-related SSCs that perform safety-significant functions SSCs in this category have one or more of the following characteristics: • They are credited in the FSAR to perform design functions that contribute significantly to plant safety. • They are relied upon to initiate and complete control actions essential to maintaining plant parameters within acceptable limits established for a DBE, or to maintaining the plant in a safe state after it has reached safe shutdown. • Their failure could directly lead to accident conditions that may have unacceptable consequences (e.g., exceeding siting dose guidelines for a DBE) if no other automatic systems are available to provide the safety function, or no preplanned manual operator actions have been validated to provide the safety function. For SSCs in this category, GDC 22 requires functional diversity, to the extent practical. b. lower safety significance: safety-related SSCs that do not perform safety-significant functions, and NSR SSCs that do perform safety-significant functions SSCs in this category have one or more of the following characteristics: • They provide an auxiliary or indirect function in the achievement or maintenance of a safety-related function. • They perform an NSR design function that contributes significantly to plant safety. BTP 7-19-15 Revision 8 – January 2021 • They are capable of directly changing the reactivity or power level of the reactor and their failure could