Your numbers appear to be way off. Commercial reactor grade Uranium is enriched to less than 20% (typically about 5%) while weapons grade Uranium is closer to

Your numbers appear to be way off. Commercial reactor grade Uranium is enriched to less than 20% (typically about 5%) while weapons grade Uranium is closer to 90% (the first U-235 bomb was enriched to 80%). Some specialized reactors do use highly enriched Uranium however. Source: https://en.wikipedia.org/wiki/Enriched_uranium https://en.wikipedia.org/wiki/Enriched_uranium