Callaway nuclear plant back online

Ameren Missouri's Callaway Energy Center is back online after an electrical problem caused a turbine trip and a reactor trip that shut the plant down on Dec. 2.

An Ameren release attributed the non-emergency shutdown in part to a damaged electrical cable running to one of the facility's transformers. The cable has been repaired.

"We are still in the process of determining the cause of the electrical problem," the release stated. "Our goal is to ensure the continued safe and reliable operation of Callaway."

Ameren said all nuclear systems are safe and the Callaway plant has returned to service.