The US uses laser chemistry for isotope separation, it’s orders of magnitude cheaper than gaseous diffusion via centrifuges. These guys are going at it Robinson Cursoe style.
Thanks for the reminder. I'd forgotten about laser isotope separation, although I'd only heard of it in brief articles in the technology press maybe 20 years ago. I assume it's quite highly classified.
The Iranians are, as I recall, using many thousands of centrifuges. All pumping lots of very nasty UF6 through, 24/7. Lots of ways for an accident to happen.