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Troubled Calif. nuke plant aims to restart reactor

LOS ANGELES — The operator of California’s troubled San Onofre nuclear power plant proposed Thursday to restart one of its twin reactors, more than eight months after the facility was shut down after a break in a tube carrying radioactive water.

A plan to return even one reactor to service is a milestone for Southern California Edison, coming three months after federal regulators found a botched computer analysis eventually led to excessive wear to hundreds of tubes in the plant’s steam generators.

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Edison said in a statement that it has filed the proposal with the Nuclear Regulatory Commission, which is expected to take months to review the details. The NRC has said there is no timetable to restart the plant.

Edison President Ron Litzinger said in a statement that the company, working with industry specialists, had performed more than 170,000 inspections to unravel the problem with tube wear and outline steps to fix it.

‘‘We have concluded that Unit 2 at San Onofre can be operated safely,’’ he said. ‘‘This plan will get San Onofre Unit 2 back to providing reliable and clean energy to Southern Californians.’’

Edison said it will operate Unit 2 at 70 percent power, which will prevent tube vibration. The company said it will shut down the reactor after five months for inspections.

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