Modelling of Atmospheric Dispersion Following Accidental Releases from Nuclear Power Plants — an Intercomparison of Revised French and German Model Concepts

The assessment of radiological consequences resulting from accidental releases of a nuclear installation is based on the calculation of atmospheric transport of radionuclides. An intercomparison of the calculation procedure in Germany and France shows differences characterized as follows: the relevant guideline in Germany recommends usage of the Gaussian-plume-model and dispersion parameters derived from the dispersion experiments at the research centers of Ju- lich and Karlsruhe /BMU, 1989/ official guidelines to calculate the radiological consequences do not exist in France. At the Institut de Protection et de Surete Nucleaire (IPSN) radiological consequence assessment can be done by using three different types of Gaussian based models (nomograms, plume- or puff-model), each of them with the dispersion parameters based on Doury (1976).