LOS ANGELES (AP) — The operator of the shuttered San Onfore nuclear power plant submitted a draft plan to federal regulators Monday that could help pave the way to restart one of the twin reactors by summer. The seaside plant between Los Angeles and San Diego has been shut down since January 2012, after a small radiation leak led to the discovery of unusual damage to hundreds of tubes that carry radioactive water. Southern California Edison wants to change the plant's federal operating rules to permit the Unit 2 reactor to run at no more than 70 percent power, which company engineers and consultants believe will limit unusual tube wear.