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There are six total and as far as I know from press reports four have been damaged. I think Nos 1,3, and 4 have had hydrogen explosions damaging the buildings. All four have probably had partial meltdown or at least damage to some of the fuel. The state of the primary pressure vessels is unknown but from the figures of high activity water in the basements it does appear there may have been some damage (cracking) of at least one vessel. Nos 5 and 6 reactors have not been reported as far as I know. I suspect this may be because they had already been shutdown a while before the incident so had less decay heat to remove, but this is only a guess.

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