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Reading the cited article it seems that they are confirming that three steel reactor containment vessels have been breached and that reactor fuel is pooling on the concrete floors of the concrete containment vessels. Absent a floor geometry specifically designed to disperse the corium into sub-critical packages it is likely to all be in one fairly small area under the hole melted through the steel. If this is the case could there be enough corium and it could be thick enough that criticality continues? If so, could not the top of the corium pool be cooled by water, which is boiling, while the bottom continues to react with the concrete?

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Sun Jun 12th, 2011 at 12:53:55 PM EST
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