The incident was classified as an "unusual event," the lowest level of nuclear power plant emergencies.
Constellation Energy Nuclear Group spokeswoman Jill Lyon said the reactor will remain shut down until the necessary repairs and post maintenance testing are finished and that the leakage didn’t pose a danger:
"The water that was leaking was contained within all the plant systems, and didn’t cause any concern for the folks that work here or in the surrounding community. Anything out of the ordinary is something we report."
Lyon said the company has determined the source of the leakage was a valve on a recirculation pump.