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Subject Earthquake could trigger San Onofre shutdown, officials say

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Original Message Officials at the San Onofre nuclear plant said it's possible that vibration sensors in the plant's backup diesel generators could be tripped by an earthquake, leading to shutdown of the generators.

Plant operator Southern California Edison reported the potential issue to the Nuclear Regulatory Commission and said it has disabled the sensors while it looks into the issue.

The diesel generators provide power to the plant and keep safety systems running in the event of a power outage. The generators have sensors that are set up to shut the generators down if they identify excessive vibration that could be caused by mechanical engine damage.

Edison was preparing to replace one of the sensors, originally installed in 1981, when an engineer questioned whether an earthquake could trip the sensor and cause shutdown of the generators, the company reported.

[link to latimesblogs.latimes.com]

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