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:
tal instrumentation and controls. The update provides guidance for the review of risk-informed defense-in-depth and diversity assessments, in addition to the existing guidance for assessments based on best-estimate methods. The update also provides review guidance for design techniques or mitigating measures, other than diversity, to address the effects of common-cause failures in digital instrumentation and controls. BTP 7-19-43 Revision 9 — May 2024 Figure 7-19-1 Four points of SRM-SECY-22-0076 and applicable BTP 7-19 sections Point 2 Detailed D3 Assessment: Risk‐Informed Approaches (Sections B.3.4.1, B.3.4.2) Point 2 Detailed D3 Assessment: Best‐Estimate Methods (Section B.3.2) Point 3 Addressing, Mitigating, or Accepting the Consequences of Each CCF Using Design Techniques or Mitigation Measures Other than Diversity (Sections B.3.4.3, B.3.4.4) Deterministic Path Risk-Informed Path Point 1 Need for a Detailed D3 Assessment (Sections B.2, B.3.1) Point 3 Addressing, Mitigating, or Accepting the Consequences of Each CCF Using Diverse Means (Sections B.3.2, B.3.3) Point 4 Independent and Diverse Displays and Manual Controls (Section B.4) BTP 7-19-44 Revision 9 — May 2024 Figure 7-19-2 Point 1—need for a detailed D3 assessment A.3 Detailed D3 assessment documentation is required. Evaluate Points 2, 3, 4. A.1 Safety-significance determination (section B.2.1) Yes No A.2.2 Can the CCF be eliminated from further consideration? (section B.3.1) Yes (internal diversity, testing, alternative methods) No A.2.1 Detailed D3 assessment documentation is not required. (section B.2.2 or B.3.1) Points 2, 3, 4 are not applicable. A. POINT 1—NEED FOR A DETAILED D3 ASSESSMENT A.2 Are the acceptance criteria from section B.2.2 met? BTP 7-19-45 Revision 9 — May 2024 Figure 7-19-3 Point 2—detailed D3 assessment B.1 Best-estimate methods (section B.3.2) B.2 Risk-informed approaches (section B.3.4) Yes B.3 Point 2 has not been met. No B.2.1 Is the risk-informed approach