Document: NUREG-0800
Document ID: fe8ec6c2-e960-404c-854f-55c77bde1672
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML2400/ML24005A077.pdf
Revision Date: 2024-05
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
ished by (1) the applicable safety analysis, (2) principles of risk-informed decision-making, as applicable, (3) specific regulations, and (4) Commission policy. This BTP is intended to provide review guidance to the NRC staff for ensuring that an application meets the policy and applicable regulations—it is not intended as guidance to applicants for developing a D3 assessment. This BTP does not cover review criteria for single random failures and cascading failures from 4 SRM-SECY-22-0076 uses the term “digital I&C system.” BTP 7-19-8 Revision 9 — May 2024 single random failures in shared resources. The reviewer can find guidance for addressing single failures in systems credited to perform safety functions in RG 1.53, “Application of the Single-Failure Criterion to Safety Systems.” 4. Purpose This BTP provides the NRC staff with guidance for evaluating an applicant’s assessment of the adequacy of D3 for a proposed DI&C system. The applicant performs this D3 assessment to identify and address potential CCFs in a proposed DI&C system and to evaluate the effects of any unprevented CCFs on plant safety. This BTP also provides guidance for review of the following:  the appropriateness of an applicant’s chosen methods for performing a D3 assessment, including any categorization of proposed DI&C systems based on the safety significance of the functions they perform  proposed design attributes—such as the use of diverse equipment, testing, or alternative approaches in the design of a DI&C system—that may eliminate a potential CCF from further consideration5  an applicant’s use of diverse equipment (external to the DI&C system), including manual controls and displays, to mitigate a potential CCF, as well as other measures to ensure conformance with the NRC’s position on addressing CCFs in DI&C systems as specified in SRM-SECY-22-0076 This BTP also addresses review of the applicant’s assessment of vulnerabilities to a CCF that can cause a