ASTM C996-15

1.1 This specification covers nuclear grade uranium hexafluoride (UF₆) that either has been processed through an enrichment plant, or has been produced by the blending of Highly Enriched Uranium with other uranium to obtain uranium of any  ²³⁵U concentration below 5 % and that is intended for fuel fabrication. The objectives of this specification are twofold: (1) To define the impurity and uranium isotope limits for Enriched Commercial Grade UF₆ so that, with respect to fuel design and manufacture, it is essentially equivalent to enriched uranium made from natural UF₆; and (2) To define limits for Enriched Reprocessed UF₆ to be expected if Reprocessed UF₆ is to be enriched without dilution with Commercial Natural UF₆. For such UF₆, special provisions, not defined herein, may be needed to ensure fuel performance and to protect the work force, process equipment, and the environment.