Edison files to shut down San Onofre reactors

Edison files to shut down San Onofre reactors


SAN ONOFRE, Calif. — Southern California Edison announced Thursday that it has taken the formal administrative step necessary to retire the two reactors at the troubled San Onofre Nuclear Generating Station.

The majority owner and operator of the plant said it filed a Certification of Permanent Cessation of Power Operations with the Nuclear Regulatory Commission Wednesday.

Edison announced last week that it would shutter the facility, which has been idle since January 2012 following a small, non-injury leak in one of the units. The other had been undergoing maintenance at the time.

An investigation determined that vibrations caused faster than expected deterioration in steam generator tubes. New generators had been installed in 2009 and 2010.

After a plan to restart the unit where the leak did not occur stalled before the NRC, Edison officials announced they would retire the reactors rather than impose further uncertainties on customers, investors and the…

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