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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

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A methodology for assessing the effectiveness of safeguards l:;yl:; Leml:; was developed ih thls study and was applied to a nuclear power plant. The methodology combines fault tree analyl:;il:;, graph-theoretic modeling, and simulation modeling to produce a quantitative measure of the effectiveness of reactor safeguards systems in repelling forcible attacks. A technique was developed for determining the minimum set of vital areas which must be protected to assure that all adversary sequences are interrupted. The relative importance of detection systems, barriers, rel:;puuse force::;, and damage control measures was determined in extensive parameter variation studies, and example safeguards system designs were propoRerl for a typical power reactor.