Uranium Enrichment

Uranium enrichment is the industrial process that increases the proportion of the fissile isotope uranium-235 in natural uranium, which contains only about 0.7% U-235, to levels suitable for use as nuclear fuel. Commercial reactors typically require uranium enriched to between 3% and 5% U-235, while some advanced small modular reactor designs call for high-assay low-enriched uranium of up to 20%. Enrichment is achieved mainly through gas centrifuge technology, which spins uranium hexafluoride gas at high speed to separate isotopes by mass, having largely replaced older gaseous diffusion methods. The process sits midway in the nuclear fuel cycle, between uranium mining and milling upstream and fuel fabrication downstream. Enrichment capacity is concentrated among a small number of countries and companies, including operations in Russia, Europe and the United States, creating strategic and supply-security concerns for nations pursuing nuclear expansion. The United States has sought to rebuild domestic enrichment capability to reduce reliance on foreign, particularly Russian, supply, a concern sharpened by sanctions following Russia's invasion of Ukraine. Growing interest in nuclear power, including small modular reactors, as a low-carbon baseload energy source has renewed policy focus on securing enrichment infrastructure. Enrichment is capital-intensive and subject to strict non-proliferation safeguards under international monitoring, given its dual-use potential for weapons-grade material. Government incentives and offtake agreements increasingly support new enrichment and conversion facilities in producer countries. The industry's economics are closely tied to uranium prices, reactor construction pipelines and broader energy security policy.