The nuclear cores of Fukushima Daiichi’s Units 1 through 3 have not only melted down, but significant evidence and expert consensus show that corium (or lava-like fuel containing material from a reactor core) from each reactor melted OUT of its containment into the ground. Where exactly is it, and what risks does this situation pose for the decommissioning process and further contamination of the Pacific Ocean? So far, Tokyo Electric does not know where the reactors’ corium is nor has it expressed any concern or initiative to find out! Fact: concrete cannot contain melted nuclear fuel, and therefore, it is quite likely if not obvious that the corium has melted its way through the concrete and earth beneath the reactors.
AGreenRoad Project provides many article references that evidence the melted out corium at Units 1 through 3 and discusses the possible consequences and lack of concern and initiative from Tepco, the Japanese government and the international community. This article also examines the constitution of corium and the reactions possible in difference scenarios, in addition to the corium reactions that occurred at the Chernobyl and Three Mile Island meltdowns.