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Science and Technology of Nuclear Installations
Volume 2007, Article ID 30863, 13 pages
http://dx.doi.org/10.1155/2007/30863
Research Article

Atmospheric Transport Modeling with 3D Lagrangian Dispersion Codes Compared with SF6 Tracer Experiments at Regional Scale

1CEA Cadarache, D2S/SPR, Saint Paul lez Durance Cedex 13108, France
2CEA Cadarache, DEN/DER/SESI/LCFR, Saint Paul lez Durance Cedex 13108, France
3Nuclear Safety Institute of Russian Academy of Sciences, 52 B. Tuskaya Street, Moscow 113191, Russia
4CEA Cadarache, DEN/DTN/SMTM/LMTE, Saint Paul lez Durance Cedex 13108, France

Received 9 March 2007; Accepted 10 May 2007

Academic Editor: Giorgio Galassi

Copyright © 2007 François Van Dorpe et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The results of four gas tracer experiments of atmospheric dispersion on a regional scale are used for the benchmarking of two atmospheric dispersion modeling codes, MINERVE-SPRAY (CEA), and NOSTRADAMUS (IBRAE). The main topic of this comparison is to estimate the Lagrangian code capability to predict the radionuclide atmospheric transfer on a large field, in the case of risk assessment of nuclear power plant for example. For the four experiments, the results of calculations show a rather good agreement between the two codes, and the order of magnitude of the concentrations measured on the soil is predicted. Simulation is best for sampling points located ten kilometers from the source, while we note a divergence for more distant points results (difference in concentrations by a factor 2 to 5). This divergence may be explained by the fact that, for these four experiments, only one weather station (near the point source) was used on a field of 10 000 km2, generating the simulation of a uniform wind field throughout the calculation domain.