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the 3 Reactors which have melted down are NOT-REPEAT-NOT in cold shut-down, they are STILL melting through/down, whatever!
And those containment vessels you say where designed for just such scenarios are NOT safe, they are flawed and many of the GE MK1 BWR reactors around the world have flawed designs for venting....in other words, they don't have vents which is a MAJOR problem. many of those same reactors have also had cracks and holes in the containment vessels even though there was NO accident involved.
I've read more articles and listened to-to many experts than i care to think about, and i am telling you (not as a scaremonger), this situation in F ukushima is out of control. the Japs have no idea what they are doing or what to do and this is an order of magnitude far worse than Chernobyl!