reactors in the world, uranium is enriched to 3 to 5% ²³⁵U. Slightly enriched uranium (SEU) has a concentration of under 2% ²³⁵U.

High-assay LEU (HALEU)

High-assay LEU (HALEU) is enriched between 5% and 20% and is called for in many small modular reactor (SMR) designs. Fresh LEU used in research reactors is usually enriched between 12% and 19.75% ²³⁵U; the latter concentration is used to replace

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