They’re not economically feasible anywhere right now. Unfortunately nuclear power is very expensive compared to all the alternatives. Unless there’s some radical breakthrough I can’t see much nuclear being built in the future. No company would pay such a huge up-front cost to produce uneconomic electricity.
So the strict answer is - no, they’re not feasible everywhere. And also not feasible pretty much anywhere.
The base load argument doesn’t hold water any more - not when there are places which are progressing towards being totally free of base load. Eg. South Australia is already nearly all renewable power with in-fill from batteries and transient gas power when needed. They’re still currently getting some base load from other states but it’s small and gradually being phased out.