Nuclear Reactors 140 - Experiments on Nuclear Core Meltdowns
Corium is a name that was coined for the molten material that results when the fuel of a nuclear reactor melts down in a nuclear accident. It contains nuclear fuel, fission products, control rods, structural material, and chemical reaction products with air, water and steam. If the reactor core is breached, then there will also be molten concrete in the mix. There is currently a debate about the fate of the corium created during the nuclear disaster at Fukushima in March of 2011.