If you can separate the it, you can then put the other part back into a reactor and keep it out of other places.
Also, by picking up where research left 60 or so years ago, much of that "spent" fuel can be burned much further (todays reactors only burn a few percent of the fuel). Stuff like MSR, LFTR and TWR reactors, for example. They are not new by any means. It's just that back then the decission to use the now common reactor types was made. In part for rather obvious reasons, what with the cold war and stuff, wanting to have nukes, etc.
Ah, but then look at the greens. They have a different idea for what to do with all that "waste":
http://www.greens.org/s-r/35/35-08.htmlYes! It should be vitrified, so that it never, ever, can be re-used or recycled. Funny how on one side they complain about the current "waste" needing such a long storage, but on the other side demand that it stays just that way, instead of making the most use of what we already have. Hippocrites.
Greetings,
Chris