NFS helped pioneer a process to convert highly enriched uranium (HEU) into low enriched uranium (LEU) for peaceful uses in commercial power reactors. The company performed the conversion on test quantities of material for the Tennessee Valley Authority (TVA) in 1998 as part of its Off-Specification Uranium Project. The project is a part of the US Department of Energy (DOE) program to reduce existing stockpiles of HEU produced for nuclear defense during the Cold War.

The 1998 project saw NFS convert HEU into LEU which was manufactured into lead test assemblies. The assemblies were successfully used in powering TVA's Sequoyah Unit 2 reactor for 18 months. NFS has also performed various HEU-to-LEU downblending efforts for other customers.