A Palo Verde Nuclear Generating Station reactor unit is nearly back to full production after suffering a minor explosion in an electrical cabinet.

Arizona Public Service Co. (APS) reported the July 2 incident as an “unusual event,” the lowest of 4 emergency levels classified by the federal Nuclear Regulatory Commission (NRC).

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APS spokesman Betty Dayyo said the explosion consisted of arcing inside a cabinet that routes electricity to equipment in a turbine building. Dayyo said the cause is under investigation.

APS said no radioactive material released from the three-reactor plant 50 miles west of downtown Phoenix. Utilities in Arizona, California, New Mexico and Texas own the facility.

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Palo Verde’s Unit 1 reduced its power production to 60 percent but started ramping back up Thursday, reaching 93 percent by Friday morning.

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