> The advantage of combining solar with nuclear is that their generation profiles are different.

Nuclear generates a constant amount of power 24/7. If in the near future we generate a lot of power from photovoltaics during the day, we won't need the nuclear base load. We should switch to something that's a better fit: Batteries or perhaps gas turbines.

> > It's very expensive. In fact, noone knows how expensive it will end up being after a couple thousand of years.

> If you actually reprocess the fuel there is no "couple thousand of years".

We've had nuclear power for many decades. Ask yourself: Why isn't reprocessing being done at a scale that's sufficient to get rid of the most problematic waste?

> If you instead put it in a dry hole in the desert, you have a desert where nobody wanted to live to begin with that now has a box of hot rocks sealed in it. It's not clear how this is supposed to cost an unforeseeable amount of money.

Again, it's harder than it looks because despite billions of dollars spent all over the world, noone has managed to create a final disposal site yet.