I wonder. On one hand, water supply in No. 1 failed for 27 hours, in No. 2 and 3 only 7 hours. On the other hand, that the No. 1 meltdown didn't end up as a total melt-through and cooling works now gives me the idea that what happened first was a lower teperature event: the fuel rods must have splintered when the casing and the cladding failed.

_{*Lunatic*, n.
One whose delusions are out of fashion.}