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The paper offers a double-cascade scheme for reducing the concentration of  232, 234, 236 U isotopes in reprocessed uranium hexafluoride. The greatest decrease of the ratio between the masses of  236 U and  235 U is provided in the product of the first ordinary cascade enriched by  235 U at the concentration of less than 20%. For this purpose, a special mode of stages operation is determined. Enrichment by  232,   234 U is performed in the second ordinary cascade, which is fed by the product of the first cascade. After being purified from  232, 234 U, the waste flow is diluted till the concentration of  235 U is less than 5%. This paper describes the methodology for calculating the parameters of cascades with the stage separation factors correlating with gas centrifuges. This methodology served as a basis for a computational experiment. It is demonstrated that the output gained after the dilution meets the requirements of the American Society for Testing and Materials C996-20 specification for the commercial grade of low-enriched uranium hexafluoride in terms of  232,   234 U isotopes. The content of  236 U in it is several times less than during the direct enrichment of reprocessed uranium hexafluoride.

Double Cascades for Purification of Reprocessed Uranium Hexafluoride from 232, 234, 236 U Isotopes