Workers are repairing a hydrogen leak at Cooper Nuclear power plant in Southeast Nebraska after the problem was discovered in one of the turbines during maintenance.
Nebraska Public Power District spokesman Mark Becker said the small hydrogen leak isn't in the power plant's nuclear systems, and it doesn't represent a safety threat.
The plant near Brownville continued operating after the leak was found Tuesday morning.
The hydrogen is used to help cool the turbine.
The utility notified regulators about the problem, and issued what the Nuclear Regulatory Commission calls a notice of unusual event.