• A computer analysis of designs for the San Onofre Nuclear Generating Station should have pointed out problems in the design of steam tubes, which have worn faster than expected.
• SONGS is offline, which has left California with a tight safety margin of capacity for the summer.
• NRC investigators said changes made for manufacturing reasons led to tubes which underwent more vibration that the station's designers anticipated.

From the article: "SAN JUAN CAPISTRANO, Calif. (AP) — Federal regulators said Monday that a botched computer analysis resulted in design flaws that are largely to blame for unprecedented wear in steam tubes at the San Onofre nuclear power plant, but it isn't clear how the problems can be fixed. ..."