The Palisades Nuclear Plant in southwestern Michigan has been shut down due to a loss of water in a cooling system.
The facility in Covert Township was shut down just before 3 p.m. Friday.
The lowest of four emergency classification levels was declared. The classification means plant workers were notified and were resolving the problem.
Officials say the shutdown poses no risk to the public and that no radioactive materials were released.
A U.S. Nuclear Regulatory Commission inspection was held at the Van Buren County plant last month after a water pump component failed.
The plant is owned by New Orleans-based Entergy Corp.