Abstract
As a first step to model the effects of hygroscopicity the water activity of CsOH solution was implemented in the condensation model. The model predicts a significant contribution of hygroscopicity due to CsOH on the suspended mass concentration, which is in accordance with the observations from latest large scale containment aerosol experiments. In this work this simplified CsOH hygroscopicity model has been compared with a case for aerosol particles consisting of mixed solutions (e.g. Cs0H-Cs2CO3-CsI-H20) expected in particles released during severe accidents. Water activities of binary and mixed solutions have been calculated using semiempirical methods and these results were compared with the available experimental data. Also a comparison between different heat and mass transfer models have been carried out to find a suitable method for the growth rate calculations of hygroscopic aerosol particles.
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