The cost of nuclear power is almost entirely capex and financing, not opex. Uranium input cost for nuclear power plants is 0.5c/kWh. With breeders you can divide that by about 100.
At least as of a couple years ago nuclear costs just a little more than solar plus storage and that’s not stopping anyone heh.
Capex and financing is still an issue for many countries, and the opex is a non-zero commitment beyond just the fiscal portion. Most countries that pass-over nuclear energy are fairly justified in their decision. The status-quo is still not super psyched about nuclear proliferation.
There is room to change that, but the cards are very heavily stacked in China's favor. America's bad at the financing part, fickle when it comes to enforcement & supply chains, and ostensibly 2 days away from bailing on the IAEA itself. The proliferation-resistance of Thorium reactors gives China an export trump card that America will struggle to match.
At least as of a couple years ago nuclear costs just a little more than solar plus storage and that’s not stopping anyone heh.