Document: NUREG-0800
Document ID: ac43f632-9db1-4857-9f56-bfba45965456
Document Type: srp
Title: * These are modifications to a plant’s design, operations, or other activities that require NRC approval. These modifica
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0232/ML023250195.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19
CFR Part: 
CFR Title: 

Content:
proposed revisions provide sufficient margin to account for analysis and data uncertainty). • Current regulations have been met, or the proposed exemption is acceptable. SRP 19-36 IV.4 Scope of Risk Analysis • The licensee's risk analysis satisfactorily addresses all mode/initiator combinations or • The licensee's risk analysis does not analyze all mode/initiator type combinations. However, in each instance, the licensee has demonstrated that  suitably redundant and diverse plant response capability is maintained for significant initiators in these modes and  sufficient elements of the plant response capability are subject to programmatic activities to ensure suitable performance. IV.5 Level of Detail of Risk Analysis • The PRA is detailed enough to account for important system and operator dependencies. • Risk insights are consistent with the level of detail modeled in the PRA. IV.6 Quality of the PRA • There is reasonable assurance that the PRA is of sufficient quality to support the conclusions as they impact the decision, as shown by the licensee's process to ensure quality, including an independent peer review, and by a focused-scope application-specific review by the staff. • Results are robust in terms of uncertainties and sensitivities to the key modeling parameters. • Key performance elements for the application have been appropriately classified and performance is backed up by licensee actions. IV.7 Evaluation of Risk Impact • If the risk-informed application assesses whether it meets Principle 4 by evaluating the change to risk quantitatively, then the following applies:  The application either decreases plant risk, or if an application increases risk, the increase is within the guidelines defined in Regulatory Guide 1.174. The cumulative and synergistic effects on risk from the present and previous applications have been addressed. Licensee risk-management practices are being followed to minimize the risk from plant operations.  An