It should be noted that this does not mean a free lunch. Breeder reactors take in U235 and U238 and output Pu which can then be used in another reactor. This does not violate conservation of mass/energy because U238 does have some nuclear "potential energy" which cannot be easily released. The breeder reactor is a means of accessing the stored energy in U238. If you take the total matter+energy input to a breeder reactor, and the matter+energy output, they are still equal. Mass is taken from U235 and U238 and converted into some heat, some useful energy, and mass of Pu, which can then be further used to end up with more energy and less mass. On Fri, Nov 21, 2008 at 4:23 AM, Artem Zezyulinskiy wrote: > Don't forget the breeder reactor, that produce greater amount of fuel > than it consume: > > http://en.wikipedia.org/wiki/Breeder_reactor > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist