Flow diagram of separating cascades: А. Traditional cascade with one feed stream, F (c), of natural uranium and one stream of enriched uranium product, P (x), with a waste stream of D (у); В. Cascade with two feed streams and two streams of enriched uranium; С. A part of cascade В with the same two feed streams as in Fig. В but with one cascade outlet (intermediate) stream of product, Рх1=Р1(х1)+Р2(х1)+ΔP, with enrichment х1.