Civilian nuclear power help share costs with the nuclear military industrial complex (e.g. Russia, France, UK, USA) and it's useful for countries that have a clear and pressing desire to be able to develop a nuclear bomb in a hurry (Sweden, South Korea, Japan), but without those caveats there isn't much point to it which is why nobody else builds it.
Its LCOE is 5x that of solar and between 1.5x-3x more expensive than solar/wind paired with just about all viable forms of green large scale storage (hydrogen, batteries, pumped storage (studies prove that unlike the river dams it is often confused with, geography for pumped storage is plentiful)).
Meanwhile tariffs like https://octopus.energy/agile/ reduces the need for that storage for easily shiftable demand sources like heaters/electric car batteries [edit in response to coldpie].
Pairing it with non-green gas is cheaper still, even in spite of the war. If up-front cost is your only concern, gas+solar+wind wins on all fronts.
It also takes ~20 years to build a nuclear plant, while new solar capacity can start taking meaty chunks out of current gas usage after 12 months. Given that western countries are between 40-60% gas powered these days and we don't have 20 years to avoid climate catastrophe, it leaves only two obvious choices of power source to decarbonize quickly - solar + wind.