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:
hnical Characteristics and Attributes for Information Sources Used in the Base PRA Development Type of Information Characteristics and attributes (See Note) Design • The safety functions required to maintain the plant in a safe stable state and prevent core or containment damage • Identification of those SSCs that are credited in the base PRA to perform the above functions • The functional relationships among the SSCs including both functional and hardware dependencies • The normal and emergency configurations of the SSCs • The automatic and manual (human interface) aspects of equipment initiation, actuation, operation, as well as isolation and termination • The SSC’s capabilities (flows, pressures, actuation timing, environmental operating limits) • Spatial layout, sizing, and accessibility information related to the credited SSCs • Other design information needed to support the base PRA modeling of the plant Operational • That information needed to reflect the actual operating procedures and practices used at the plant including when and how operators interface with plant equipment as well as how plant staff monitor equipment operation and status • That information needed to reflect the operating history of the plant as well as any events involving significant human interaction Maintenance • That information needed to reflect planned and typical unplanned tests and maintenance activities and their relationship to the status, timing, and duration of the availability of equipment • Historical information related to the maintenance practices and experience at the plant Engineering • The design margins in the capabilities of the SSCs • Operating environmental limits of the equipment • Expected thermal hydraulic plant response to different states of equipment (such as for establishing success criteria) • Other engineering information needed to support the base PRA modeling of the plant It is recognized that for reactors in the design