Not specifically nukes. Any power source without huge seasonal or day-to-day variability will do. But we are going to need a lot of it.
My personal guess is that this means nukes win the day in the end, and that this will mostly be accomplished by siting them in politically friendly jurisdictions and putting up HVDC lines to places that break out in hives at the sight of a cooling tower. But that is a guess. Paving over a chunk of the sahara and running HVDC lines north would also work. Rooftop solar in europe will, however, not, as people dont stop driving in winter.