In the frame of the OECD/SETH-2 project, an experimental program is being carried out at PSI (PANDA Facility in Switzerland) and CEA (MISTRA Facility in France) with the aim of generating high-quality experimental data which will be used for improving modeling and for Lumped Parameter and 3D (CFD) code validations. The PANDA test program consists of seven types of test series, focusing on gas stratification break-up induced by mass sources (simulating the release of steam and hydrogen), heat sources (simulating the energy generated by hydrogen-oxygen recombiner operation) or heat sinks (due to condensation of steam caused by containment coolers, sprays or ''cold" walls). Two series of PANDA tests are devoted to obtaining detailed data on the integral behavior of Passive Containment Cooling Systems (PCCS) of Advanced Light Water Reactors (ALWR) in the presence of different non-condensable gases (air, hydrogen) and also to investigating the gas mixing and stratification induced by the sudden interconnection of compartments with large gas concentration differences, e.g. the opening of rupture disks.
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