In the interview (of yesterday) that you can find on cnn.com, with Physicist James Acton, who is an expert in these issues, was saying a Chernobyl -style massive release of radiation is incredibly unlikely. If he is correct, than Kaku, who may be a physicist but not a nuclear expert, was again being irresponsible. I've read today that Chernobyl did not have a containment vessel.

Chris