Separations of U/Pu and Np/Pu using fluoride volatility

•Analytical separation factors of 108 for uranium separation from plutonium with no PuF6 carry over, are demonstrated using flow and static experiments at > 3 atm NF3.•Analytical separation factors of 105 for neptunium separation from plutonium, with no PuF6 carry over, are demonstrated using NF3 in flow experiments.•Preliminary data concerning separation of protactinium from neptunium, using NF3, are presented.