I'm no expert on the issue, but the decades lasting and still ongoing discussions about a atomic waste location in Germany seem to contradict your statement. B

I'm no expert on the issue, but the decades lasting and still ongoing discussions about a atomic waste location in Germany seem to contradict your statement. Burring something for a few years is easy, but what about hundreds, thousands, ten thousands? The earth moves and this stuff is way more concentrated than anything found naturally. What if it hits ground water?