http://hisz.rsoe.hu/alertmap/index2.phpOne of several redundant security systems involved in monitoring the perimeter of the San Onofre nuclear plant stopped working for 45 minutes early Saturday, triggering the declaration of an "unusual event" that is considered the lowest level of emergency. Southern California Edison, the plant's operators, did not release details of the incident or describe the type of equipment involved, but Edison spokesman Gil Alexander said the system was not related to nuclear operations and no part of the plant's perimeter was left unguarded. "At no time was there an issue of plant security or safety," Alexander said. "At no time was the plant unsafe or the public unprotected. Nevertheless, when you're talking about a nuclear plant, you want all of the multiple redundant systems working all the time." The "unusual event" declaration required immediate notification of the Nuclear Regulatory Commission, he said. "The senior NRC resident inspector is on the scene, observing how we
handled this," Alexander said. The system stopped working at 6:12 a.m. Although it was restored within 45 minutes, the plant remained on unusual event status until 9:50 a.m., he said. Edison officials were still trying to determine the cause of the failure Saturday afternoon. "We continue to run diagnostics and investigate what the cause of it was," Alexander said. "And we don't have anything we can convey thus far on that." Unusual events have happened before at San Onofre, and at other nuclear plants, he said. It is the lowest of four emergency classifications. The highest of them would indicate a release of radiation.
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