First U.S. nuclear reactor built from scratch in decades enters commercial operation in Georgia::ATLANTA — A new reactor at a nuclear power plant in Georgia has entered commercial operation, becoming the first new American reactor built from scratch in decades.
U-238 is largely stable and has the consistency of metal, making it easy to store or sequester away. Most natural deposits of Uranium are U-238.
Additionally you can make a breeder reactor that bombards U-238 to make U-239 which has a half life of 23+ minutes and decays into Plutonium-239 which can be used in nuclear power generation.
Not sure what you’re even trying to say with the first bit. It’s completely irrelevant
No breeder reactor has ever produced enough fuel to run on and extracted it. Breeder programs get as far as half of a proof of concept and then run out of funding on the actually hard part.