That's also an 'if we clean it up'. Nuclear waste decays, and there is not a lot you can do about that.

If reactors, or the placement of them, are designed to be left in-situ after decommissioning, then the cost becomes a lot less. Moving spent fuel from one site to another makes little sense when the original site has already been designated nuclear.

As others have said, this kind of number is always pitched at nuclear, and not hydro, or coal, or any other form of power.