We have many. Most aren't in effect yet though, but it also isn't a serious issue. They're stored safely in cement caskets, with molten glass and stuff to keep it together and safe, with effectively zero chance to cause an issue. There are permanent ways to store it safely, but we haven't invested in them yet for many reason. Mostly, dirty energy companies pushing the anti-nuclear message have purposefully hamstrung nuclear from becoming a great solution, and people who think they're being smart believe them.