ASTEC V1.3 Code Assessment

In most of the severe accident scenarios in light water reactors the deposition and resuspension of aerosols in the primary circuit influence mainly the release of radioactive material into the containment. Due to an energetic interactions, e.g. hydrogen burning, or fluid mechanical load high velocity jets or sudden pressure changes the deposited aerosols can be resuspended and significantly increase the amount of radioactive material reaching the containment and finally the potential threat of the release into the environment (source term). In this report two aerosols mechanical resuspensions models implemented in the SOPHAEROS / ASTEC V1.3 Rev.0 module are validated against the STORM resuspension experiments SR09, SR10, SR11, SR12 and SR13 and the modelling weakness are identified. In spite of the fact that these models encompass the measurements, it is shown that further improvement of aerosol resuspension model in SOPHAEROS module is necessary in order to achieve a better predictability of the source term during severe accident.