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From the Wiki entry on Fast-neutron reactor:
"Although some sodium-cooled fast reactors have operated safely (notably the Superphnix), sodium problems can be prevented by using lead or molten chloride salts as a coolant"
"Breeding, which is the primary advantage of fast over thermal reactors, may be accomplished with a thermal, light-water cooled & moderated system using very high enriched (~90%) uranium"
"Gas-cooled fast reactors have been the subject of research as well"