Nuclear Reactor Refueling Outage Begins Early After Unit Trips Offline

Palisades nuclear unit trips offline

The Palisades nuclear unit in Michigan automatically tripped offline as workers with plant operator Entergy (NYSE: ETR) prepared it for a refueling outage.
The reactor was at 85 percent when a digital electro-hydraulic (DEH) alarm went off in the control room.  Shortly after the alarm sounded, the turbine tripped which resulted in an RPS actuation and the reactor tripping offline.
All control rods inserted fully and the auxiliary feedwater system started in response to low steam generator water levels. The plant is currently stable, and workers say the initial investigation into the cause points to a DEH power supply failure.
Workers will continue with the $58 million refueling outage that was scheduled to begin Sept. 20. In addition to equipment maintenance and refueling, workers will complete safety enhancements ordered after the 2011 Fukushima accident, an additional $50 million investment.
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