Those impurities do muck up your centrifuges. It's not a problem if you want 3.5 percent enriched uranium for power plants, but if you go to 90 percent these impurities are a major problem.
A vast percentage of centrifuges have to be rejected in testing, up to 60% rejection.
A vast percentage of centrifuges have to be rejected in testing, up to 60 percent rejection.