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:
ies due to a period of below-average precipitation in a given region, thereby depleting the water supply needed for the various water-cooling functions at the facility. Low Lake or River Water Level A decrease in the water level of the lake or river used for power generation. River Diversion The redirection of all or a portion of river flow by natural causes (e.g., a riverine embankment landslide) or intentionally (e.g., power production, irrigation). Heavy Load Drop Hazards Heavy Load Drop An uncontrolled, unplanned lowering of a heavy load onto an SSC. This hazard is analyzed with respect to direct and indirect effects on SSCs. High Wind Hurricane Winds Dynamic loading on SSCs from wind or missiles due to a hurricane. Straight Winds Dynamic loading on SSCs from wind or missiles due to a strong wind that is not associated with either tornadoes or hurricanes (e.g., derecho). Tornado Dynamic loading on SSCs from wind or missiles due to a tornado. Sandstorm Persistent heavy winds transporting sand or dust that infiltrates SSCs at or in the plant’s analyzed area causing functional failure. Hail A shower of ice or hard snow that could result in transportation accidents or directly cause dynamic loading or freezing conditions as a result of ice coverage. RG 1.247, Appendix B, Page B-5 Hazard Hazard Group Direct or Secondary Impact of Hazard Industrial Accidents Industrial or Military Facility Accident An accident at an offsite industrial or military facility that results in a release of toxic gases, a release of combustion products, a release of radioactivity, an explosion, or the generation of missiles. Onsite Excavation Work The unintended effects of onsite excavation work that may impact the structural integrity of SSCs. Pipeline Accident A release of hazardous material, 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