safe disposal of nuclear waste is easy, just bury it inside a granite mountain.
Even the truly horrible stuff will be safe-ish in a few hundred thousand years, and there are mountains in the uk which haven't moved for about 400 million years, and show no signs of going anywhere soon.
the hard parts are dismantling the power station, and then convincing people who live within a few hundred km of the containment mountain that it's a good idea.
In the long run, it's either nuclear fusion (which doesn't work yet), or we go back to an economy based on goats and parsnips.
the next 50 years will be VERY interesting, whichever way it goes, goat soup anyone?…