[en] The bundles from the CORA-2 and CORA-3 Severe Fuel Damage (SFD) experiments, consisting of 9 unheated fuel rods and 16 electrically heated simulators, together with an Inconel spacer grid at middle elevation, have been evaluated on the basis of an extensive optical and SEM-analytical investigation of collected samples and selected cross sections. The results take into account measurements and visual observations during the tests as well as informations from single-effects investigations. In the present contribution the CORA-2 and CORA-3 fuel rod bundle degradation is interpreted by a short description of the pertinent phenomena, their causal mechanisms and their mutual interference. (orig./DG)