Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
The lumped parameter code HEPCAL has been worked out in the Institute of Thermal Technology of the Silesian University of Technology for simulations of pressurized water reactor containments response to accidental conditions, especially during loss-of-coolant accidents (LOCA). Within the framework of this work the HEPCAL code has been applied for simulations of hydrogen behavior within containments of Advanced Boiling Water Reactor (ABWR) and European Pressurized Reactor (EPR). The focus has been put on hydrogen distribution thorough subcompartments of the containment building. A dynamics of creating flammable mixtures and operation of hydrogen removal systems were also the subjects of analysis.