Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
r are shown to be represented by the characteristics of the subsuming group • The duration and number of entries into each POS are determined • The development, grouping, and quantification of the POSs are documented in a manner that facilitates PRA applications, upgrades, and peer review Initiating Event Analysis • The initiating event analysis includes the same characteristics and attributes as for at-power, as well as the following: ─ examination of human-induced initiating events, for example, those resulting from maintenance activities, including different types of LOCAs (e.g., drain- down events as opposed to pipe breaks) ─ review of plant operational practices in grouping of events Success Criteria Analysis • The success criteria analysis includes the same characteristics and attributes as for at-power, as well as an analysis appropriate to the POS definition and characterization Accident Sequence Development Analysis • The accident sequence development analysis includes the same characteristics and attributes as for at-power, as well as an accounting for changing plant conditions within a POS Systems Analysis • The systems analysis includes the same characteristics and attributes as for at- power, as well as the identification of conditions varying from one POS to another for spatial and environmental hazards, systems actuation signals, system inventories (e.g., air) Parameter Estimation Analysis • The parameter estimation analysis includes the same characteristics and attributes as for at-power, as well as the following: ─ performance of estimation on a POS-specific basis, when necessary ─ consideration of plant-specific data unique to POS (i.e., not applicable to at- power) Human Reliability Analysis • The human reliability analysis includes the same characteristics and attributes as for at-power, as well as the following: ─ differentiation between calibration errors that may impact equipment performance at-power versus low-power