Terminology associated with probabilistic risk assessment (PRA) techniques.

DOE-STD-1183-2004

transport and deposition.

h. Discuss the physics of fires and explosions as the means of generating airborne plumes of

hazardous materials and damaging barriers to releases. Also describe how the physics

affects the quantities or rates that hazardous materials may become airborne as a result of

spills, evaporation, entrainment, fires and other accidents.

Discuss the phenomena and modeling of airborne dispersion of toxic materials addressing

weather effects, turbulent mixing, mixing heights, plume temperature, evolution and

potential settling or plate out of particulates and aerosols, precipitation, building wake and

surface roughness effects.

Discuss the mechanisms involved in the damage caused by extreme natural phenomena

including: hurricanes, tornadoes, ice storms, wind, flood, earthquakes and wild fires.

k. Define and discuss the following terms:

Chi/Q

Dose conversion factor

Breathing rate

Aerodynamic equivalent diameter

Solubility class

Population dose

Given a source term, determine dose consequences applying Chi/Q, dose conversion

factor, breathing rate and specific activity as applicable.

m. Given a simple accident scenario, demonstrate knowledge by constructing a simple neutral

gas dispersion and heavy gas dispersion. Estimate consequences using an accident

modeling code including hand calculations and explain the assumptions, inputs and results.

n. Discuss the process for evaluating assumptions made for scenarios being modeled.

o. Discuss the methods used in the calculation of criticality accidents.

6. Nuclear safety specialists shall demonstrate a familiarity level knowledge of

terminology associated with probabilistic risk assessment (PRA) techniques.

Supporting Knowledge and/or Skills

a. Identify the strengths and weaknesses of probabilistic risk assessment for safety design

and regulatory decision-making.

b. Define the following terms with respect to reliability engineering and probabilistic risk

assessments:

Availability

Unavailability

Risk

Safety

Accident sequence

Dominant contributors

Minimal cut set