Southern California Edison made its smartest decision in a long time by announcing that it would retire the San Onofre nuclear plant.
As evidence has piled up in the nearly year and a half since both Units 2 and 3 went dark, it has pointed more and more strongly to a scenario under which the utility played things too fast and loose with its two new steam generators, which cost $670 million but quickly showed wear in the vast arrays of tubes that were unprecedented in the industry.
Unprecedented because -- as a letter from an Edison official said years ago, though its contents were only recently revealed -- nothing quite like this design had been done before. To Edison’s credit, that was true because the company was trying to produce a safer, better steam generator. It’s also to its credit that utility officials were raising important safety questions during the design and construction of the generators, built by Mitsubishi Heavy Industries.
If only Edison had been that careful when it came to getting the new generators approved by the U.S. Nuclear Regulatory Commission. Instead, it opted to convince the NRC that the new generators were essentially the same as the old ones — which obviously wasn’t true — in an effort to avoid tighter regulatory scrutiny of the design. Had the NRC taken a closer look from the start, there’s a good chance it would have caught the design flaws.
