United State v. Eurodif S.A. et al., etc., No. 07-1059; U.S. Supreme Court; opinion by Souter, J.; decided January 26, 2009. On certiorari to the U.S. Court of Appeals for the Federal Circuit.
Nuclear utilities generally procure their fuel, “low enriched uranium” (LEU), through one of two types of contracts. Under an “enriched uranium product” (EUP) contract, the utility simply pays the enricher cash for LEU of a desired quantity and “assay,” i.e., its percentage of the isotope necessary for a nuclear reaction. The amount of energy required to enrich a quantity of “feed uranium” to a given assay is described in terms of an industry standard called a “separative work unit” (SWU). Under a “SWU contract,” the utility provides a quantity of feed uranium and pays the enricher for the SWUs to produce the required LEU quantity and assay. SWU contracts do not require that the required number of SWUs actually be applied to the utility’s uranium.
