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by ygra 2676 days ago
It's mentioned somewhat, but admittedly not terribly clear:

> Of the five corium creations, only Cherobyl’s has escaped its containment. With no water to cool the mass, the radioactive sludge moved through the unit over the course a week following the meltdown, taking on molten concrete and sand to go along with the uranium (fuel) and zirconium (cladding) molecules.