So? Bury it deep if you don't want to use it ever again. Spent fuel stays solid and compact. I would store it for few hundred years for radioactivity to decay to easily manageable levels then pull it back up to reprocess and keep using it. Spent fuel from light water reactors still has over 90% of usable energy in it. "Waste" from today's reactors could become fuel for future generations.Hundreds of years...