Dose calculation parameters using reduced source terms

The uncertainties in two models used in consequence analyses -- plume buoyancy and dry deposition velocity -- were examined parametrically with the following results: The dry deposition velocity value of 1 cm/sec, recommended for use in CRAC2, is found to give conservative results for distances of interest for both historic and reduced source terms. Incorporation of plume buoyancy in the calculation is found to result in short distance doses markedly below those for nonbuoyant plumes. For reduced source terms, mean doses calculated with plume buoyancy are well below the severe health effects threshold range. (orig./HP)