In the enrichment process, the fissionable U-235 content in naturally occurring uranium, which is about 0.7 percent, is increased to about

Enrichment raises the fissile U-235 share from about 0.7 percent to roughly 3 percent for reactor fuel.

A level near 5 percent is higher than the typical low enriched reactor grade.

A figure of 10 percent lies well above ordinary power reactor requirements.

A value of 12 percent is far too high for standard commercial reactor fuel.

Natural uranium holds mostly U-238, with only a small fissile U-235 fraction.

Weapons grade uranium, by contrast, is enriched to about 90 percent U-235.