http://www.matter.org.uk/schools/content/NuclearReactor/NuclearReactorApplet.html Note: If you leave it alone to let it overheat, the fuel rods begin to deform at 1000 degrees C.
(Cheers to Nick.)
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Bonus Office Supervillain-type Thing:
http://www.everythingusb.com/dream-cheeky-oic-missile-launcher-19882.html