The conversion is part of the U.S. plutonium disposition program that will eliminate the U.S. surplus weapon plutonium. According to NNSA, "LANL is expected to convert at least two metric tons (MT) of plutonium to oxide by 2018 as part of a larger effort to provide up to 10 MT of early feedstock for MOX."
United States produces MOX feed from weapon plutonium
U.S. National Nuclear Security Administration announced that it completed production of the first batch of "more than 240 kg" of plutonium oxide that will serve as a feedstock for the MOX Fuel Fabrication Facility (MFFF). The plutonium came from disassembled pits of nuclear weapons. The disassembly and conversion were done at Los Alamos National Laboratory.