Southern California Edison has announced plans to downsize work labor by almost one-third at San Onofre nuclear plant. The downsizing of about 730 positions will bring the plant’s employees down to 1,500. The plan should be accomplished later this year. The cut will take place in part because of problems with steam generators which have kept the plant closed since the beginning of 2012. The downsizing is also a result of operating costs that are higher than in other similar facilities.