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.
Highlights
In the case of risk assessment of nuclear power plant, the use of validated atmospheric transfer codes is essential to have an idea of nuclides ways of transfer in all compartments of the environment and properly estimate the impact of chronic or accidental atmospheric releases
In order to improve these tools and promote their correct utilizations, the intercomparison between different models and associated results is an essential step [3, 5]. In this spirit and within the framework of a collaboration between the Commissariat al’Energie Atomique (CEA, Cadarache, France) and the Nuclear Safety Institute of Russian Academy of Sciences (IBRAE, Moscow, Russia), this study presents some comparisons of 3D atmospheric transfer codes with field atmospheric tracer experiments
(ii) for calculations with SPRAY, there is a difference by a factor of 4 to 5 (Arc 1) for the SF6 concentration compared to field measurements and NOSTRADAMUS results on the three arcs
Summary
In the case of risk assessment of nuclear power plant, the use of validated atmospheric transfer codes is essential to have an idea of nuclides ways of transfer in all compartments of the environment and properly estimate the impact of chronic or accidental atmospheric releases. In order to improve these tools and promote their correct utilizations, the intercomparison between different models and associated results is an essential step [3, 5]. In this spirit and within the framework of a collaboration between the Commissariat al’Energie Atomique (CEA, Cadarache, France) and the Nuclear Safety Institute of Russian Academy of Sciences (IBRAE, Moscow, Russia), this study presents some comparisons of 3D atmospheric transfer codes with field atmospheric tracer experiments.
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