Well, at a high level that's what's being done. Nuclear fuel is mined from underground and the spent fuel is put back underground. But it's much better to put

Well, at a high level that's what's being done. Nuclear fuel is mined from underground and the spent fuel is put back underground. But it's much better to put it in a known location where it's away from water sources. Naturally occurring uranium is actually a fairly common pollutant in drinking water, putting the uranium back where it came from isn't always a good choice when there are better alternatives.