Document: NRC Regulatory Guide
Document ID: cde52d5a-adf9-49be-9d1f-59449dfca895
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:
age B-2 Table B-1. List of Hazards Hazard Hazard Group Direct or Secondary Impact of Hazard Animals Animals Land-based or airborne animals that cause damage to plant equipment, such as loss of offsite power, or that result in other hazards (such as transportation accidents). Biological Events Biological Events Accumulation or deposition of vegetation or organisms (e.g., zebra mussels, clams, fish, algae) on an intake structure or internal to a system that uses raw cooling water from a source of surface water, causing its functional failure. External Fire Wildfire Direct (e.g., thermal effects) or indirect effects (e.g., generation of combustion products) of a fire in an area of combustible vegetation (e.g., trees, grass) outside the plant boundary defined by the internal fire PRA. Non-safety-related Building Fire Direct (e.g., thermal effects) or indirect effects (e.g., generation of combustion products, propagation to safety-related structures, systems, and components (SSCs) of a fire in a non-safety-related building. External Flooding High Tide The periodic maximum rise of sea level resulting from the combined effects of the tidal gravitational forces exerted by the Moon and Sun and the rotation of the Earth. This hazard may be analyzed when it occurs concurrent with other hazards such as a storm surge or straight wind to produce flooding effects. Hurricane Flooding Flooding that results from a hurricane (tropical cyclone). For example, storm surge, flooding due to rivers and streams, flooding due to dam failure, flooding due to intense rainfall, and flooding due to a wind-caused seiche, as induced by a hurricane. Local Intense Precipitation Flooding that results from local intense precipitation. Secondary hazards resulting from local intense precipitation include, but are not necessarily limited to, dam failure and river and stream overflow. Seiche Flooding from water displaced by an oscillation of the surface of a landlocked body of water, such as a lake, that