BRIDGMAN - Officials at Cook Nuclear Plant reported the plant released approximately 2,000 gallons of oil into Lake Michigan Saturday, and that the spill was reported to local, state and federal agencies.

"On Saturday, a declining level trend on a Unit 2 main turbine lube oil reservoir was being investigated when the leak was identified and stopped," a media release stated.

"The turbine lube oil system contains approximately 25,000 gallons of non-radioactive oil. The hot oil runs across tubes in a heat exchanger that is cooled by water from Lake Michigan. It is believed the oil leaked into a tube or tubes and was mixed into the cooling water. The leak, calculated at approximately 0.04 gallons per minute, could not be detected in the total water discharge flow of 1.5 million gallons per minute," the release said.

Plant officials contacted Berrien County Sheriff's Department Emergency Management, along with the Michigan Department of Environmental Quality, the U.S. Environmental Protection Agency and the U.S. Nuclear Regulatory Commission.

"We had been actively troubleshooting the level decline and closely monitoring our water discharge before we identified there actually was a leak and found the likely source," said plant Environmental Manager Jon Harner in the release. "Our searches haven't detected any oil on the beach or in the lake. We'll continue to monitor the situation."

The Cook plant is owned by Indiana Michigan Power.