This standard is applicable to operations with plutionium-uranium oxide fuel mixtures outside nuclear reactors@ except the assembly of these materials under controlled conditions@ such as in critical experiments. Basic criteria are presented for plutonium-uranium fuel mixtures in single units of simple shape containing no more than 30wt5 plutonimu combined with uranium containing no more than 0.71 wt% 235U. The limits for uniform aqueous mixtures (solution) are applicable to homogeneous mixtures and slurries in which the paraticles constituting the mixture are uniformly distributed and have a diameter no larger than 127 mm (0.005 in.)@ i.e.@ are capable of being passed through 120 mesh screen. This standard does not include the details of administrative controls@ the design of processes or equipment@ the description of instrumentation ofr process control or detailed criteria to be met in transporting fissionable materials.