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A model of public evacuation is developed for use in evaluating the efficacy of evacuation as a protective measure in response to atmospheric releases of radioactive material. Differences between this model and the model of public evacu ation previously developed for the Reactor Safety Study p^e described. Based on an analysis of available EPA evacuation data, ranges are suggested for the temporal parameters in the new model. The relative importance of the model paramett.s is also discussed.

Three generic sheltering/relocation strategies are identified and discussed. They are (1) population relocation only (no specific sheltering response initiated), (2) sheltering at location followed by' relocation, and (3) preferential sheltering followed by relocation. Shielding factors representa tive of these strategies are calculated, and the adequacy of using average shielding factors for the calculation of public health effects is discussed. DISTRIBUTION OF THIS DOCUMENT IS UNLIMITEDJ-4

List of Figures List of Tables 13 Core-Melt Release Categories.