The Palisades nuclear power plant in southwestern Michigan is being shut down temporarily for maintenance.
Spokesman Mark Savage said in a statement that control room operators removed the plant from service Thursday night. The plant is near Lake Michigan in Van Buren County's Covert Township. Savage says the plant was being cooled down Friday morning.
The maintenance work involves the system that controls the nuclear reactor's power level.
There are 45 seals that form a boundary between the cooling system and the atmosphere inside the building that houses the reactor. Officials say one of the seals is showing signs of wear and will be replaced.
Savage says the plant will return to service when the job is finished. Palisades is owned by New Orleans-based Entergy Corp.