Using Microsoft Excel® to Compute the 5% Overall Site X/Q Value and the 95th Percentile of the Distribution of Doses to the Nearest Maximally Exposed Offsite Individual (MEOI)

This paper describes the method using Microsoft Excel (R) (Microsoft Corporation One Microsoft Way Redmond, WA 98052-6399) to compute the 5% overall site X/Q value and the 95(th) percentile of the distribution of doses to the nearest maximally exposed offsite individual (MEOI) in accordance with guidance from DOE-STD-3009-1994 and U.S. NRC Regulatory Guide 1.145-1982. The accurate determination of the 5% overall site X/Q value is the most important factor in the computation of the 95(th) percentile of the distribution of doses to the nearest MEOI. This method should be used to validate software codes that compute the X/Q. The 95(th) percentile of the distribution of doses to the nearest MEDI must be compared to the U.S. DOE Evaluation Guide of 25 rem to determine the relative severity of hazard to the public from a postulated, unmitigated design basis accident that involves an offsite release of radioactive material. Health Phys. 98(Supplement 2):S48-S55; 2010