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The ASTEC/Sophaeros computer code has been developed to model transport of reactive gases and aerosols in pipe flows with extensive coverage of chemical and physical phenomena. As part of the ASTEC severe-accident code co-developed by IRSN in France and GRS (Gesellschaft für Anlagen- und Reaktorsicherheit) in Germany, it is principally used to evaluate so-called radioactive source terms released to the environment in the event of potential accidents affecting water-cooled nuclear reactors. A major uncertainty in the past concerned the impact of chemistry on radioactivity transfer where the treatment of chemical phenomena was recognized as inadequate. Work described here, involving mainly systematic identification of relevant species and thermodynamic- data verification, has vastly improved this situation leading in particular to creation of a comprehensive database with fully-referenced sources of information. Further prospective improvements in this area are described.

Progress in chemistry modelling for vapour and aerosol transport analyses