If you factor in all the cost usually externalised in nuclear power, it’s often a lot more expensive than people realise. Decommissioning nuclear waste and old reactors is a huge, time-consuming, and thus extremely expensive operation.
Nuclear waste is a problem caused by activists preventing disposal sites like yucca mountain from being built
This turns out not to be the case, and all these supposedly "externalized" costs are actually included in the price of electricity produced by nuclear reactors.
For example in Switzerland, all of that still allows full production costs of 4,34 Rappen (with a profit).