If the fuel rods are reprocessed, and I think they will be, then each reactor produces about one cubic meter of waste per year. We are talking about 60,000 cubic meters per year. One repository could handle it, although I suppose political considerations will require that many nations have their own. The purpose of this page is not to advocate that all energy be generated by nuclear reactors, although that might eventually be a good idea. The purpose is to show that humanity can get all the energy it needs or wants.
Nuclear energy is used in what mathematicians call an existence proof.
Every country that has tried to manufacture nuclear weapons has done so using plutonium production reactors rather than using fuel from power reactors. It seems likely that a desperate war between countries of even moderate technology would get nuclear and be very bad whether or not nuclear power was in wide use. The number of hits on this page since 1996 April 17.