The video here is pretty interesting. These two posts seemed to be the most helpful to me as I was researching the Fukushima situation. The measured speed that corium in a lab eats through concrete gives me the impression that the bad rumors about Fukushima might just be true. And, it also tells me that the solution I suggested yesterday might need a rethink.
http://www.wired.com/...
http://www.ne.anl.gov/...