THAI test facility for experimental research on hydrogen and fission product behaviour in light water reactor containments

•Large scale facility for investigating representative LWR severe accident scenarios.•Coupled effect tests in the field of thermal-hydraulics, hydrogen, aerosol and iodine.•Measurement techniques improved and adapted for severe accident conditions.•Testing of passive mitigation systems (e.g. PAR) under accident conditions.•THAI data application for validation and development of CFD and LP codes.