Xenon This is bait =\

I think a mixer can do alloys from molten metals, right?

(Quote from GregoriusT)

Yeah I know, "thermal" and "fast" refer to the speed of the neutrons used in the reaction.
Thermal (slow) neutrons need a moderator to slow them down, only work with specific isotopes (e.g. U235) and produce radioactive waste.
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Greg, whenever you'll come around to implementing nuclear reactors, will you just add thermal reactors (IC2 style, that can only burn U235) or will you also add fast reactors designs (the ones that can burn U238, Plutonium, Thorium, and basically any…