I'm generally a proponent of nuclear power but you might want to make your

"Can radioactive wastes from nuclear power be safely disposed of?"

question clearer as my first thought was "define 'safely'".

I'm normally the one saying that sealing it in glass, wrapping it in steel, concrete, steel and then burying it in a mountain above the water table in the middle of nowhere constitutes safe for reasonable purposes but it's also pretty fair for critics to say that we have so little experience of really long term construction projects or what future conditions will be like (perhaps a settlement will end up there thousands of years down the line for no good reason) that just pointing to a review paper doesn't really cut it.

If you'd said "reasonably safe" or "safe enough that it's unlikely to cause problems unless someone intentionally mines into it a thousand years from now and starts selling glowing jewlery to all the locals" it would have been a clear yes but I couldn't answer that without disclaimers.