Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
), overpressure effects, seismic effects, and the effects of ejecta resulting from a ground strike. Table D-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 and/or ability of operator to perform. Debris effects – resulting in clogging of filters or adversely effecting 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 Explosions – resulting in fire, missiles, gas releases Effects on operator ability to: • 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 DG-1362, Appendix D, Page D-7 Missiles – projectiles damaging structures and equipment Physical obstruction – movement of structures or equipment reducing accessibility Reduced air quality – combustion products affecting equipment or operator performance Reduced availability of cooling water Structural failure, including • collapse • functional failure (e.g., break in containment, or settlement of a structure) • loss of structural integrity Thermal effects including • 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 DG-1362, Appendix D, Page D-8 REFERENCES 9 1. NRC, “PRA Procedures Guide,” NUREG/CR-2300, Washington, DC, January 1983. (ADAMS Accession Package No. ML063560438) 2. NRC, Generic Letter 88-20, Supplement 4, “Individual Plant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities - 10 CFR 50.54(f)