Yes, nuclear power projects bid below what they know it will cost and then pull a shocked-pikachu face when the final bill ends up several times the original "cost estimate".
Look at Flamanville in France: budget triple the "estimate", 15 years to construct. France has more nuclear energy per-capita than any other country on Earth, so it's not like they don't know how to "do" nuclear.
Look at Flamanville in France: budget triple the "estimate", 15 years to construct. France has more nuclear energy per-capita than any other country on Earth, so it's not like they don't know how to "do" nuclear.