Since the era of Jimmy Carter, the US has had a stance to not allow nuclear reprocessing to reduce nuclear proliferation. He was hoping that other countries would follow the United States stance, however, this is not the case. France, Russia, India, and Japan are some of the countries already reprocessing Nuclear Waste.
Nuclear Reprocessing would reduce the speed at which unusable nuclear waste is generated, and would allow more energy production without needing to find a new source of raw materials.
http://www.world-nuclear.org/info/Nuclear-Fuel-Cycle/Fuel-Recycling/Proc...