Condensation heat transfer coefficients in LWR-containments during LOCA

Best estimate calculations in nuclear safety analysis require replacement of conservative assumptions by measured data or verified correlations. In the field of containment response analysis this holds for condensation heat transfer coefficients at containment structures. In a large scale pressure suppression test facility heat transfer coefficients are determined at structures of the drywell in order to get data representative for break compartments of LWR-containments. Experimental results show heat transfer coefficients of the order 104 W.m-2.K-1 even at presence of noncondensable gas