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:
ial, a release of combustion products, an explosion, or the generation of missiles due to an accident involving the rupture of a pipeline carrying hazardous materials. Release of Chemicals from Onsite Storage A release of hazardous material including, but not limited to, liquids, combustion products, or radioactivity. Such releases may be concurrent with or induce an explosion or the generation of missiles. In this context, an onsite release of radioactivity is assumed to be associated with low-level radioactive waste. Toxic Gas A release of hazardous toxic or asphyxiant gases. Such releases may be concurrent with or induce an explosion or the generation of missiles. Lightning Lightning Effects on SSCs due to a sudden electrical discharge from a cloud to the ground or Earth- bound object. Seismic Natural Tectonic Earthquakes Sudden natural ground motion or vibration of the Earth as produced by a rapid release of stored-up energy along an active fault. Secondary hazards resulting from seismic activity include, but are not necessarily limited to, avalanche, dam failure, industrial accidents, landslide, seiche, tsunami, and vehicle accidents. Human-Induced Earthquakes Sudden human-induced ground motion or vibration of the Earth as produced by a rapid release of stored-up energy along an active fault. Secondary hazards resulting from seismic activity include, but are not necessarily limited to, avalanche, dam failure, industrial accidents, landslide, seiche, tsunami, and vehicle accidents. Snow Avalanche Rapid flow of a large mass of accumulated frozen precipitation and other debris down a sloped surface resulting in dynamic loading of SSCs at or in the plant’s analyzed area causing functional failure or adverse impact on natural water supplies used for heat rejection. RG 1.247, Appendix B, Page B-6 Hazard Hazard Group Direct or Secondary Impact of Hazard Snow Cover The accumulation of snow could result in transportation accidents or directly cause dynamic loading or