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:
e of hazardous materials or combustion products, an explosion, or the generation of missiles causing functional failure of SSCs or preventing operator actions. Hazards that could potentially result in transportation accidents include, for example, a vehicle, railcar, or ship (boat) accident that involves a collision or derailment, potentially resulting in fire, explosions, toxic releases, missiles, or other hazardous conditions. RG 1.247, Appendix B, Page B-7 Hazard Hazard Group Direct or Secondary Impact of Hazard Volcanic Activity Volcanic Activity Opening of Earth’s crust resulting in tephra (i.e., rock fragments and particles ejected by volcanic eruption), lava flows, lahars (i.e., mud flows down volcano slopes), volcanic gases, pyroclastic flows (i.e., fast-moving flow of hot gas and volcanic matter moving down and away from a volcano), and landslides. Indirect impacts include distant ash fallout (e.g., tens to potentially thousands of miles away). Secondary hazards resulting from volcanic activity include, but are not necessarily limited to, seismic activity and fire. RG 1.247, Appendix B, Page B-8 Table B-2. List of Hazard Causes and Conditions Combustion/fire—resulting in burning, release of hot/toxic gases, release of combustion products, or heat causing functional failure of SSCs, or failure of the operator to perform, or both. Debris effects—resulting in clogging of a liquid flow path or adversely affecting equipment performance. Dynamic forces (from dynamic or static loading)—resulting in structural damage to SSCs causing functional failure of SSCs, or impeded operator ability to perform actions, or both. Explosions—resulting in dynamic forces, fire, missiles, or gas releases. Effects on operator ability to do the following: • perform an 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