[djmcmath]

Liquid metal reactors? Short answer: No. I'd like to give a much longer answer, but I'm not sure what we've declassified, and I don't feel like usurping that authority, myself. Look for Chernobyl documentaries, perhaps stuff done by the TVA or Naval Reactors. The good ones explain exactly what happens in a graphite-moderated reactor, and why US designs are more safe.

Cheers,

Dan