Heck, even household garbage is still around after one generation. And wouldn't it be swell if the CO2 and other crap that regular power plants put out was stored at a facility instead of blown all over the planet. It's probably still there after a generation too.

There is no way to bring all nuclear waste to background levels in just thirty years, so if that's a showstopper for you, so be it. Personally, I think within thirty years it's going to be practical to start shooting it into space.

Here are a couple of sites on nuclear waste:

From the Nuclear Age Peace Foundation. Yeah, I know, but there's a lot of good data here, and note that they come to the same conclusions about the best storage method as I have.

This site has pro and con positions on nuclear waste reprocessing, which is an essential technology for dealing with waste and for keeping nuclear power economical.