The Nuclear Regulatory Commission is investigating a hydrogen gas leak that has shut down the Millstone Unit 3 nuclear reactor.
The NRC says the leak occurred Sunday morning in a turbine building at the Connecticut plant, and workers responded by manually shutting down the reactor.
Neil Sheehan, a spokesman for the Nuclear Regulatory Commission, tells The Day of New London that leak occurred after a sealant plug for hydrogen in the main generator came lose. He says workers successfully vented out the hydrogen.
The reactor recently returned to operation after a scheduled outage for refueling.
The NRC says it is trying to determine whether the leak may have been related to work done during that refueling.
Copyright 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.