This isn't true at all. In Europe Nuclear is about the same price per KWH as industrial solar (I.E. Solar farms, the roof top ones are far less efficient).

https://www.iea.org/reports/projected-costs-of-generating-electricity-2020

On top of that the West put in lots of intentional blockers for Nuclear Development to slow its progress (and in turn raise prices). Places like India and China that are actively producing 20+ Nuclear reactors at the same time are actually helped by their government rather than slowed down which would in turn reduce cost even further.