1.VerbTo blend highly-enriched uranium, typically from decommissioned nuclear weapons, with uranium containing a low concentration of fissile uranium-235 (slightly-enriched uranium, natural uranium, or depleted uranium) in order to convert it to low-enriched uranium suitable for use as fuel in standard power reactors but not usable for a fission bomb.
"The facility has the capacity to downblend 5 tonnes of bomb-grade uranium per year."