Study of in-containment source term behavior for VVER-1000 under LOCA conditions using the IRBURN code system

According to the results, the impact of re-suspension rate from free surfaces on the source term production is dominant during initiation of the accident, while the influence of volumetric time dependent source increases during the evolution of the accident. Besides, the deposition on the containment surfaces has almost the largest contribution in removal of activity during the accident.