It is difficult to find truly informed opinion on the Fukushima reactor disaster in Japan. The Daily Kos Community site by Richard Blair seems very credible from what I can discern. The writer claims to be a Nuclear Power Operations-certified systems engineer in GE Boiling Water Reactors (BWRs). I have no reason to disbelieve it.
Actually, Rachel Maddow (and writers) did a very even handed presentation this evening of the basics of reactors, radiation, and nuclear power generation on her show.
Blair (writing under the pseudonym Richard Cranium) shares some interesting insights on the Fukushima boiling water reactors. It’s worth a look. It is part of a larger effort at information aggregation called the Japan Nuclear Disaster: Mothership.