Separative Work Unit

Separative Work Unit
(SWU)
  The standard measure of enrichment services. The effort expended in separating a mass F of feed of assay xf into a mass P of product assay xp and waste of mass W and assay xw is expressed in terms of the number of separative work units needed, given by the expression SWU = WV(xw) + PV(xp) - FV(xf), whereV(x) is the "value function," defined as V(x) = (1 - 2x) 1n((1 - x)/x).
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary

Energy terms . 2014.

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