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:
nt, should be evaluated and addressed by considering, as a minimum, the functional partitioning within the DI&C architecture, and whether the CCF could originate in shared resources or could adversely affect any interconnected portions of the DI&C system. Reviewers should determine whether the applicant’s D3 assessment is adequate to protect against CCFs that are either (1) identified through design analysis or (2) postulated as design defects that are not identifiable through design analysis. The reviewer should also consider whether the D3 assessment includes an analysis of the effects of CCFs to verify that these effects are bounded by the acceptance criteria defined in the FSAR or in the license amendment request (LAR) for the limiting events applicable to the proposed DI&C system. A D3 assessment should include the information necessary for the NRC staff to perform its review. When evaluating a D3 assessment, the reviewer should do the following:  Confirm that a D3 assessment was performed for the proposed system to determine whether CCF vulnerabilities have been adequately addressed.  Evaluate whether the D3 assessment indicates that CCF vulnerabilities have been BTP 7-19-17 Revision 9 — May 2024 adequately addressed.  Evaluate whether the D3 assessment indicates that CCF vulnerabilities that might result in spurious operations have been adequately addressed.  Confirm that the potential consequences of any residual CCF vulnerabilities not previously addressed have been evaluated and fall within the limiting plant design-basis consequences. General Approach The reviewer should consider whether the D3 assessment is adequate to identify and defend against CCF vulnerabilities. Acceptable methods for an applicant to use to address or defend against vulnerabilities include, but are not limited to, the following:  The applicant eliminated CCF vulnerabilities from further consideration through any of the methods below, either alone or in