The US didn't use MOX fuel in its power reactors, though. The Megatons to Megawatts program with Russia used highly enriched uranium that was surplus from Russi

The US didn't use MOX fuel in its power reactors, though. The Megatons to Megawatts program with Russia used highly enriched uranium that was surplus from Russian weapons: https://en.wikipedia.org/wiki/Megatons_to_Megawatts_Program https://en.wikipedia.org/wiki/Megatons_to_Megawatts_Program The US had hoped to dispose of its own weapons grade plutonium surplus via MOX fuel for power reactors, but the project was shut down in 2018 after running late and over budget: https://world-nuclear-news.org/Articles/US-MOX-facility-contract-terminated https://world-nuclear-news.org/Articles/US-MOX-facility-cont... Work started on the MOX Fuel Fabrication Facility (MFFF) in 2007, with a 2016 start-up envisaged. Although based on France's Melox MOX facility, the US project has presented many first-of-a-kind challenges and in 2012 the US Government Accountability Office suggested it would likely not start up before 2019 and cost at least USD7.7 billion, far above original estimate of USD4.9 billion.