Document: NRC Regulatory Guide
Document ID: 8a2332d3-66ca-40af-84e1-507db8b26559
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
n action due to physical obstacles • perform a cognitive function • see • breathe • communicate • obtain available information (e.g., poor procedures, poor or no indication) High-energy arcs Missiles—projectiles damaging structures and equipment Physical obstruction—movement of structures or equipment that reduces accessibility Reduced air quality—combustion products or other airborne particulates affecting equipment or operator performance Reduced availability of cooling water Structural failure, including the following: • collapse • functional failure (e.g., break in containment, settlement of a structure) • loss of structural integrity Thermal effects, including the following: • heat transfer (radiative, conductive, or convective; advection (i.e., bulk transport of a fluid)) • steam Water effects—water infiltration, submergence or spray causing corrosion, loss of electrical integrity (e.g., electrical short), clogging, inaccessibility, structural failure RG 1.247, Appendix B, Page B-9 REFERENCES1 1. American Society of Mechanical Engineers (ASME)/American Nuclear Society (ANS) Standard ASME/ANS RA-S-1.4-2021, “Probabilistic Risk Assessment Standard for Advanced Non-Light Water Reactor Nuclear Power Plants,” ASME, New York, NY, ANS, La Grange Park, IL, February 2021. 2. U.S. Nuclear Regulatory Commission (NRC), NUREG/CR-2300, “PRA Procedures Guide: A Guide to the Performance of Probabilistic Risk Assessments for Nuclear Power Plants,” Washington, DC, January 1983. (Agencywide Documents Access and Management System (ADAMS) Accession Package No. ML063560438) 3. NRC, Generic Letter 88-20, Supplement 4, “Individual Plant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities—10 CFR 50.54(f),” Washington, DC, June 28, 1991. (ADAMS Accession No. ML031150485) 1 Publicly available NRC published documents are available electronically through the NRC Library on the NRC’s public Web site at