The utility Southern California Edison has announced that by year's end it would eliminate 730 jobs at the San Onofre nuclear power plant, or about a third of its workforce. The two operating reactors have been shut since radiation leaks were detected earlier this year. Under California utility rules, the costs of a plant that is disabled for more than nine months can be taken out of the formula that builds utility rates. That would mean SoCal Edison, its majority owner, can't pass plant costs on to ratepayers.