COVERT TOWNSHIP, Mich. (AP) -- The Palisades Nuclear Power Plant near South Haven, Michigan has been removed from service.

Officials at the plant say it's due to a cooling water leak.

The minor leak was discovered in a containment building.
Removing the plant from service is described by the plant's operators as a conservative measure. The leak was being repaired.

New Orleans-based Energy Corp. owns the plant in Van Buren County's Covert Township, southwest of Grand Rapids.
The company said no radioactive material was released outside the plant and "Palisades will be returned to service when repairs are completed."

Operators shut down the reactor June 12 to repair a leak in a refueling water storage tank at the plant. The plant was returned online by July 11.

Palisades is one of the 10 oldest nuclear plants int he country and had five unexpected shutdowns in 2011 resulting in an investigation by the Nuclear REgulatory Commission.