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What most don't realize here is there was/is a working earthquake system on each of these plants which went off on all but one plant. When the sensors detect the earthquake they immediately drop Boron rods into the vessel to stop the reaction. Right now no reaction is taking place (planned) but you have to understand it takes days and WEEKS to cool this down normally from it's core operating temperature.
Google Boron and nuclear meltdown....it's pretty interesting.
The core temperature has to be over 4000 degrees F to melt the rods. I've seen numbers of 1000 and 2000 degrees discussed so far. The cores are cooling but it's going to take some serious time...
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