Before we construct new nuclear reactors, we must solve the problem of what to do with spent fuel rods. The rational solution would be to reprocess these rods and use the resultant plutonium to construct new rods. Approximately 90% of the potential energy contained in the rods is wasted when they are pulled out of the reactor.
Given the cost of uranium, reprocessing the spent fuel is not economically feasible. The spent fuel can be safely stored either onsite at each plant or in a recoverable central repository. When there are enough plants built and running, and the curent closed uranium mines are re-opened and running full tilt, then it may be time to think about re-processing spent fuel.