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Diablo Canyon Unit 2 nuke generator shut down

SAN LUIS OBISPO, Calif. (AP) -- A Central California nuclear power plant has shut down one of its two generators after an electrical arc occurred during a storm.

Unit 2 at Diablo automatically went offline Sunday.

Pacific Gas & Electric spokesman Blair Jones says a flashover, or electrical arc, occurred from a buildup of dust mixed with moisture on a lightning arrestor. The arrestor is on a non-nuclear part of the plant that helps transmit power to the state's electric grid.

Jones says the event happened as the drought-stricken area got its first heavy rain in a long time.

Jones says Unit 2 will remain offline until the incident is investigated and the lightning arrestor is repaired and tested. However, he says the shutdown won't affect electrical supplies to PG&E customers.

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