Experiments at TOPFLOW and ROCOM

The presentation introduces to activities at HZDR, which are related to thermal hydraulics safety concerns of Gen II and GEN-III nuclear reactors. We show examples of thermal hydraulic studies conducted at the TOPFLOW facility, which comprises two-phase pipe flow experiments, condensation experiments, pressurized thermal shock experiments, counter-current flow experiments, and boiling experiments. The ROCOM facility was created to study mixing and boron dilution in a 1:5 scaled-down PWR model. Both facilities, though serving different purposes and working in different parameter ranges, are equipped with most sophisticated measurement techniques and contribute to the answers on many thermal hydraulic phenomena occurring in today’s light water reactor systems.