Diablo Canyon nuclear plant cited for cooling system problem

The problem was traced to an improperly installed switch

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SAN LUIS OBISPO, Calif. (AP) — Federal regulators have cited the Diablo Canyon nuclear power plant for a problem that may have knocked out a reactor cooling system for a year-and-a-half.

The Tribune of San Luis Obispo says the Nuclear Regulatory Commission issued a "white finding" on Thursday. That color-coding means the problem created a low-to-moderate safety risk at the Central Californianuclear plant.

During a test in May, workers found that an emergency cooling system for one of the two reactors wasn't working — and may not have been operating since it was last checked in October 2014.

The problem was traced to an improperly installed switch.

A spokesman says the plant operator, Pacific Gas & Electric, has corrected the problem and it plans to appeal the NRC finding.

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