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:
est-estimate methods – section B.3.4 for the use of risk-informed approaches  section B.3.4.1 for determining consistency with NRC policy and guidance on risk-informed decision-making  section B.3.4.2 for modeling a CCF  Point 3—addressing, mitigating, or accepting the consequences of a CCF: – section B.3.2 for crediting diverse means to mitigate the impact of a CCF  section B.3.2.1 for crediting existing systems  section B.3.2.2 for crediting manual operator action  section B.3.2.3 for crediting a new diverse system – section B.3.3 for determining whether the consequences of a CCF may be acceptable – section B.3.4 for design techniques or mitigating measures other than diversity  section B.3.4.3 for determining the risk significance of the CCF  section B.3.4.4 for determining the appropriate means to address the CCF  Point 4—providing independent and diverse displays and manual controls: – section B.4 for manual system-level actuation and indication of critical safety functions to address Point 4 Figures 7-19-2, 7-19-3, 7-19-4, and 7-19-5 at the end of this document provide a visual aid to reviewers for reviewing an application against the four points. The guiding principles in SECY-18-0090 clarify that the D3 assessment described in Point 1 BTP 7-19-12 Revision 9 — May 2024 should be commensurate with the safety significance of the proposed DI&C system. As described in SRM-SECY-22-0076, Point 1 allows for consideration of the risk significance of the DI&C system and the CCF. Specifically, Point 1 calls for the D3 assessment to be commensurate with the risk significance of the proposed DI&C system. Point 2 uses the term best-estimate methods, which is generally understood to refer to methods that use realistic assumptions, that is, the initial plant conditions corresponding to the onset of the event being analyzed. Point 2 also includes acceptance criteria for best-estimate methods that are less conservative than the