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Both PWR's and BWR's are like that, and it's called negative void coefficent. Having a positive one is very bad, as in an exponentially accelerating nuclear reaction when the core heats up. That's what happened at Chernobyl. The core went from 1000 MW to 1000 GW in a fraction of a second, blowing everything to hell.

Peak oil is not an energy crisis. It is a liquid fuel crisis.
by Starvid on Thu Mar 31st, 2011 at 03:43:39 PM EST
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