>Then you're reconfiguring a breeder into a burner. You don't have both at the same time. My point was what the same fast reactor can be used as both breeder a

>Then you're reconfiguring a breeder into a burner. You don't have both at the same time. My point was what the same fast reactor can be used as both breeder and burner without specifying "at the same time". And I am pretty sure (though not 100% confident) that you can mix both breeder and burner rods, thus changing breeder/burner ratio at will. >the part where you concentrate a substantial mass of an unholy mix of medium-lived actinides to be burned into a fairly large structure seems kind of scary Yeah, fuel and waste handling is probably the most difficult part of a breeder/burner system, not the reactor itself.