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:
ion within an acceptable timeframe is an acceptable means of diverse actuation. If a postulated CCF is risk significant and the assessment does not demonstrate the adequacy of other design techniques, prevention measures, or mitigation measures, then a diverse means must be provided. 4. Main control room displays and controls that are independent and diverse from the proposed digital I&C system (i.e., unlikely to be subject to the same CCF) must be provided for manual, system-level actuation of risk-informed critical safety functions and monitoring of parameters that support the safety functions. These main control room displays and controls may be used to address point 3, above. The applicant may alternatively propose a different approach to this point in the policy if the plant design has a commensurate level of safety. The logical structure of this BTP addresses the four points in SRM-SECY-22-0076, as shown in Figure 7-19-1. The following BTP sections apply to the evaluation of an application against the four points of SRM-SECY-22-0076:  Point 1—determining the need for a detailed D3 assessment: – section B.2.1 for making a safety-significance determination BTP 7-19-11 Revision 9 — May 2024 – section B.2.2 for using the safety significance to determine whether a detailed D3 assessment is necessary – section B.3.1 for determining whether a CCF can be eliminated from further consideration  section B.3.1.1 for the use of diversity within the DI&C system  section B.3.1.2 for the use of testing  section B.3.1.3 for the use of methods other than diversity and testing  section B.3.1.4 for the use of a qualitative assessment and failure analysis  Point 2—performing a detailed D3 assessment to address each CCF: – section B.3.2 for the use of best-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