Hello, I have a few questions regarding the transmutation processes inside fast reactors. I would appreciate your help. I am doing some work at the university about SFR and ABR. First of all, I know that fast reactors can operate in 3 modes: burner, breeder and converter (halfway between burner and breeder). My question is, can the same reactor operate in any of these ways, or are they only designed for one specific mode? If you put MOX fuel, does it mean that you want it to operate in breeder mode? Another thing is, how do you calculate the transuranics conversion ratio? I am currently doing (mass of transuranics at EOC)/(mass of transuranics at BOC) but I don't know if this is correct. Also, if your objective is to burn transuranics, should you put just Plutonium and no Uranium in the fuel? Because if you put Uranium, then the U-238 transmutes to U-237 through n,2n, then decays beta into Np-237 which is very inconvenient because it has a very long half life. Also, could you please give me some good internet bibliography about SFRs? Google is not really helpful. Thanks.