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Comparison of Average Transport and Dispersion Among a Gaussian, a Two-Dimensional, and a Three-Dimensional Model (NUREG/CR-6853)On this page: Download complete document The following links on this page are to documents in Adobe Portable Document Format (PDF). See our Plugins, Viewers, and Other Tools page for more information. For successful viewing of PDF documents on our site please be sure to use the latest version of Adobe. Publication InformationManuscript Completed: October 2004 Prepared by
Pacific Northwest National Laboratory J.A. Mitchell, NRC Project Manager Prepared for AbstractThe simplifying atmospheric transport and dispersion assumption used by MACCS2, the Nuclear Regulatory Commission’s code for predicting off-site consequences, is tested by comparison to ADAPT/LODI, a state-of-the-art, three-dimensional advection-dispersion code. Also included in the comparison is the Nuclear Regulatory Commission’s code for rapid emergency response, RASCAL, and a newer related code with upgraded dispersion and deposition modules, RATCHET. Meteorological data for the test were provided by the Department of Energy’s Atmospheric Radiation Measurement Program Southern Great Plains site in central Oklahoma and Kansas, a site with a unique and comprehensive set of mesoscale meteorological data. Each model was run in its normal manner to produce the annual average integrated exposure and deposition for a series of rings at 16.1, 32.2, 80.5, and 160.9 km (10, 20, 50, and 100 miles) from a hypothetical release, and the integrated exposure and deposition for arc-sectors at the same set of distances and the 16 compass directions. Nearly all the annual average ring exposures and depositions and the great majority of the arc-sector values for MACCS2, RASCAL, and RATCHET were within a factor of two of the corresponding ADAPT/LODI values. |
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