The only thing making nuclear power too expensive is the enormous cost of fed/state/local permits plus the litigation from the greenies.
I was listening to either Mike Church or Andrew Wilkow this morning on the drive to work and one of the items mentioned by a caller was that the local utility shelved plans for a new nuclear reactor when the permit fees alone were going to cost some $50,000,000. That's before the architectural design, engineering, environmental impact studies, grennie litigation, construction, staffing, fuel, etc.