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
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Content:
ects 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 or component. A D3 assessment should include the information necessary for the 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 or component to determine whether CCF vulnerabilities have been adequately addressed. • For each event analyzed in the accident analysis sections of the SAR, evaluate whether the D3 assessment indicates that CCF vulnerabilities that might result in loss of function have been 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 BTP 7-19-17 Revision 8 – January 2021 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 combination: – using diversity within the DI&C system or component (Section B.3.1.1) – using testing (Section B.3.1.2) – using alternative methods (Section B.3.1.3) – for low-safety-significance SSCs, using a qualitative assessment and failure analysis (Section B.3.1.4) • The applicant mitigated consequences of