“…As a result of the accident, approximately 62 tons of fuel assemblies were melted and approximately 20 tons were relocated down from the central part of the core and solidified in the reactor pressure vessel (RPV) lower head, which was full of water (Broughton et al, 1989). TMI-2 was not the first nuclear reactor accident with a core meltdown; there had been nuclear accidents with core meltdowns, such as at Chalk River Laboratories, in 1952 (Canada) (Lewis, 1953) and the experimental SL-1 reactor accident in 1961 (United States) (Tardiff, 1962;Mendoza et al, 1981). However, the damaged fuel removal from TMI-2 is one of the most successful decommissioning experiences of a damaged large-scale nuclear reactor.…”