Storing nuclear waste is an artificially hyped danger. (in contrast to the powerplants blowing up)
Seriously, its not that hard to store nuclear waste in a pretty save place.
But for that you need to drop these "moral" limitations, to store this stuff in other countries, who might have better locations for that. What is needed in the end is a geologically inactive and dry place underground. Im shure its not that hard to find, when not limiting the search to the own country.
(flying this stuff to space would be the silliest sollution, as mentined when it blows up, wich is much more likely.)