Nuclear operating cost is comparable to offshore wind, coal, and combined cycle gas, and around 4X more expensive to operate than onshore wind or solar. (Of course, coal and gas would be more expensive if they had to pay a fair price for their emissions)

Nuclear is also eye-poppingly expensive to decommission.

Finally, note that operating cost doesn't include the sort of re-engineering and upgrades that are routinely required, and have doomed plants like San Onofre.