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After the Turkey Point nuclear plant incident Saturday, the Nuclear Regulatory Commission (NRC) began a special inspection Wednesday at the Florida Power & Light facility to assess the failure of a safety-related electrical bus that resulted in the plant declaring an alert and shutting down.

The plant is near Homestead, FL, about 25 miles south of Miami.

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It all started Saturday when an electrical fault occurred in a Unit 3 switchgear room, resulting in the loss of a safety related electrical bus — similar to a circuit breaker — and a reactor trip.

Other safety systems functioned as required, ensuring adequate reactor cooling. There was no threat to local residents or the environment, and the alert, the second-lowest NRC emergency declaration, terminated later that same day.

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The electrical fault, which caused an arc flash, or small explosion, also damaged a nearby fire door, which may have left other safety systems vulnerable had there been a fire. A plant worker who was in the room suffered an injury and ended up treated at a local hospital.

“This was an event that could have had serious safety consequences and we need to know more about what happened and why,” said NRC Region II Administrator Cathy Haney. “We felt a special inspection was warranted to gather more information and also determine if there are generic issues that may apply to other plants.”

“This was an electrical spark that occurred on the non-nuclear side of the power plant,” said FPL spokesman Peter Robbins. Public safety was not an issue.

“This inspection is an opportunity for us to share with the NRC what happened on Saturday and walk through the details, both the equipment performance and the action our operators took,” Robbins said.

The three-member special inspection team will be led by a senior reactor inspector from the NRC’s Region II office in Atlanta. The team will develop a detailed timeline of the event, review the plant response and operator actions as well as the design and operation of the fire protection features associated with the switchgear room. It will also review the plant’s fire brigade and emergency preparedness response and assess FPL’s actions to determine the root cause of the event.

The on-site portion of the inspection will take several days. A report documenting the results should come out within 45 days of the completion of the inspection.

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