Oh, just to let you guys know. A critical reactor isn't dangerous. It is actually a good thing, meaning it generates the exact same number of neutrons it expends. That means it is operating. A supercritical reacot isn't dangerous, either. Just means that power is rising. Now, a prompt critical reactor is a very bad thing. If you ever hear that term, I recommend you run (and try to keep up with me!) ~Will Courtier~