[en] A cascade scheme allowing two intermediate-mass isotopes to be concentrated in a single cascade above the maximum admissible concentrations at the outputs of ordinary cascades is proposed. A cascade with two flow expansions and two additional product flows is used for this. For the example of a mixture of tungsten isotopes, it is shown that the concentrations of ¹⁸³W and ¹⁸⁴W can be increased simultaneously up to 70 and 80%, respectively. In addition, additional product flows can be equal to 50–70% of the primary (end) product flow of the cascade.

[en] The object of the study is the “generalized” separation potential for multicomponent mixtures. A critical assessment of its validity from the point of view of thermodynamics is given and the assumptions made in its derivation are analyzed. The work is of a debatable nature and aims to develop a unified point of view on such a problematic topic of the theory of separation of multicomponent molecular and isotopic mixtures as the separation potential and separating capacity. (paper)

[en] The effect of the uncertainties of the isotopic composition of the reprocessed uranium on its enrichment process in gas centrifuge cascades while diluting it by adding low-enriched uranium (LEU) and waste uranium. It is shown that changing the content of ²³²U and ²³⁶U isotopes in the initial reprocessed uranium within 15% (rel.) can significantly change natural uranium consumption and separative work (up to 2-3%). However, even in case of increase of these parameters is possible to find the ratio of diluents, where the cascade with three feed flows (depleted uranium, LEU and reprocessed uranium) will be more effective than ordinary separation cascade with one feed point for producing LEU from natural uranium. (paper)