WASHINGTON, July 22 — The technical reality of enriched uranium is that it is simply uranium in which the proportion of the fissile isotope uranium-235 has been increased via isotope separation. What makes this fact worth a second look, as ever, is the dual-use nature of the process: the same enrichment technology that fuels the world’s light-water nuclear reactors can, with a little more work, produce material for a thermonuclear weapon. Naturally occurring uranium is 99.27–99.28% uranium-238, with just 0.72% of the fissile uranium-235 and trace amounts of uranium-234.
Uranium-235 is the only naturally occurring isotope that can sustain a chain reaction with thermal neutrons — the detail that matters for anyone trying to build a bomb or run a power station. To get usable fuel, you have to separate the isotopes, concentrating the 235.
LEU, HEU, and the global stockpile
Low-enriched uranium — LEU, defined as less than 20% uranium-235 — powers the majority of the world’s commercial nuclear reactors. Highly enriched uranium, or HEU, with 20% or more uranium-235, is a different beast: it is used in nuclear weapons, naval propulsion reactors, some research reactors, and specialised designs. Globally, there are approximately 2,000 tonnes of HEU.
The enrichment process itself is what keeps non-proliferation experts concerned. The same centrifuges that spin out LEU at 3.5–4.5% can, with reconfiguration, produce HEU at weapons-grade concentrations.
Under the hood, it is a matter of cascades and separation factors, not fundamentally different technologies.
From Manhattan to lasers
Large-scale enrichment began during the Manhattan Project, using gaseous diffusion and electromagnetic isotope separation. Commercially, gaseous diffusion was later replaced by gas centrifuge technology, which is now the dominant method globally. Laser isotope separation has been developed as a potential third-generation technology; Global Laser Enrichment has applied for a license to build a laser enrichment facility in the United States.
The feedstock for all this is yellowcake, which is about 80% uranium after natural uranium ore — which typically contains as little as 0.1% uranium — is milled. Yellowcake is then converted either into uranium dioxide, for reactors that do not require enrichment, or into uranium hexafluoride gas, the feed for enrichment.
Most reactors require enrichment to 3.5–4.5% uranium-235, though CANDU and RBMK designs can burn natural uranium without any enrichment at all.
Depleted and reprocessed
The leftover from enrichment is depleted uranium, mostly uranium-238, which is less radioactive than natural uranium but very dense. It finds use in radiation shielding and in armour-penetrating weapons. Meanwhile, reprocessed uranium — RepU — can be extracted from spent nuclear fuel through chemical and physical treatments, adding another layer of complexity to the material’s lifecycle.
For readers tracking the fine print of nuclear policy, the key takeaway is straightforward: the enrichment process poses inherent proliferation risks because the same centrifuges or lasers that produce LEU reactor fuel can be tuned to make HEU weapons-grade material. As ever, the detail that matters is the percentage of uranium-235, and who controls the technology that separates it.
Sources
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