Following Reactor #4’s total meltdown at the Chernobyl Nuclear Power Plant, scientists discovered massive amounts of corium, or lava-like fuel containing material, that had formed first inside the reactor vessel and, because the reactor was not receiving adequate cooling, the corium breached the reactor vessel entirely and melted through concrete, eventually settling on the floor of the reactor room. An analysis has shown that the corium was heated at most to 2255 C (4091 F) and remained above 1660 C (3020 F) for at least 4 days.


















