I dislike the medidiots who conflated a hydrogen explosion with a nuclear explosion. There is however one risk here that neither folks in the media, nor have I seen yet on HN, and that is the danger of old fuel meltdowns.

There are reports now [1] that the pond where expended fuel rods are stored is boiling. While fuel is removed from a reactor because it is 'spent' that doesn't mean that it cannot still reach criticality, that is why it is stored in a pond where the water provides the moderation. Normally this wouldn't even be considered but given the challenge of getting water into the reactors, the use of sea water and venting the steam (which makes the room around the reactor temporarily dangerous), it seems the ponds are warming up and not getting the attention they need. It would be unfortunate to have the pond evaporate. Note that in some cases this pond is the holding area for new fuel as well (during a refueling operation) but there is no information available on the quantity, and current composition, of fuel rods in these ponds.

So I remain confident they will be able to get the reactors cooled off without causing them to be 'abandoned in place'. I'm cautiously watching reports about the ponds.

[1] http://www.cbsnews.com/8301-503543_162-20043127-503543.html