Technical Basis for Regulatory Guide 1.145, "Atmospheric Dispersion Models for Potential Accident Consequence Assessments at Nuclear Power Plants" (NUREG/CR-2260)

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Publication Information

Manuscript Completed: July 1981
Data Published: October 1981

Prepared by:
W. G. Snell
R. W. Jubach

NUS Corporation
4 Research Place
Rockville, MD 20850

NRC FIN B7116

Prepared for:
Division of Health, Siting and Waste Management
Office Of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, D.C. 20555

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Abstract

Regulatory Guide 1.145, Atmospheric Dispersion Models for Potential Accident Consequence Assessments at Nuclear Power Plants, presents several substantial changes in the previous methodology of atmospheric dispersion analyses described in Regulatory Guides 1.3 and 1.4. This new methodology discussed in Regulatory Guide 1.145 includes, 1) the reduction in estimated ground-level concentrations due to plume meandering during the occurrence of stable atmospheric stability conditions and light wind speeds, and 2) the recognition that atmospheric dispersion conditions are directionally dependent. As a result of these developments, the NRC Meteorology Staff conducted a parametric study to examine the consequences of these changes on previous and future licensing activities. This parametric study was instrumental in the determination of appropriate probability levels for the risk assessment methodology discussed in the guide. The technical basis for the new methodology and the results of the parametric study are documented in this NUREG. This documentation includes the relationship of the new approach to the previous methodology.