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The Institut de Radioprotection et de Surete Nucleaire (IRSN) performed a series of air sampling campaigns at mesoscale distances (10-80km) from the AREVA La Hague reprocessing plant (north west of France) between 2007 and 2009. These samples were collected in order to test and optimise a technique to measure low krypton-85 ( 85 Kr) air concentrations, and to investigate the performance of three atmospheric dispersion models (RIMPUFF, HySplit, and ADMS). This paper presents 85 Kr air concentrations measured at both land and sea locations. In addition, this paper compares the measured 85 Kr air concentrations, which varied from 2 to 8000Bqm −3 , with the predictions from the atmospheric dispersion models. During stable wind conditions, the dispersion models make reasonable estimates of the 85 Kr field measurements. In contrast, the models fail to accurately predict temporal peaks in concentration during periods of rapid and large changes in wind speed and/or wind direction.

Mesoscale dispersion of85Kr in the vicinity of the AREVA La Hague reprocessing plant

Mesoscale dispersion of⁸⁵Kr in the vicinity of the AREVA La Hague reprocessing plant