Experimental study and analytical analysis on the global heat transfer of stratified corium in LWR lower head

• Pioneer work with large-scale naturally separated simulant material at high temperature. The turbulent flow pattern in the upper layer is influenced by boundary cooling. interlayer crust behavior reacts strongly on condition. Heat flux focusing only exists under week cooling boundary. influence of Pr number heat transfer discussed. 2D geometry effect In-Vessel Melt Retention (IVR) credited as a promising Severe Accident Management strategy to stabilize molten corium during severe accident scenarios. This not adopted VVER 440 or AP600 designs, but also included higher power reactors around 1000 MWe, such AP1000 and Chinese CPR 1000. One current research priorities bound large uncertainty cooled wall metallic atop ceramic pool, could appear this location. generation experimental data melt layers essential improve understanding between their boundaries. Under framework EU H2020 IVMR project, two test series materials were conducted LIVE2D facility KIT. Rigid top hot atmosphere realized two-layer pool different thicknesses. Important global phenomena have been obtained, including boundary, behaviour impact thickness. Finally, are