Just as a rule of thumb:
thermal reactors need a moderator and only work with odd-numbered isotopes (U235, Pu239, Pu241);
fast reactors only work without a moderator but can use any fuel
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Just as a rule of thumb:
thermal reactors need a moderator and only work with odd-numbered isotopes (U235, Pu239, Pu241);
fast reactors only work without a moderator but can use any fuel