Abstract
AbstractEstimation of radioactive material transport accident risk requires modelling of the spread of airborne contamination in a plume moving downwind from a hypothetical accident site. The plume is usually specified by selecting a windspeed and atmospheric stability condition (Pasquill category) as input to a plume dispersion calculation for a specific, hypothetical accident. Because transport accident sites and associated atmospheric conditions are unknown until a real accident occurs, a plume model based on ‘average US weather’ has been made available in the RADTRAN code. Since this model does not maximise accident-risk values, critics have complained that this model is not adequately conservative. This paper presents an investigation of the accident risks, calculated with wind speeds and Pasquill categories determined for specific locations and times, along two hypothetical transport routes. Shipments at four seasons of the year and six departure times were evaluated and the risks at hypothetical ac...
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