The Pilgrim nuclear power plant has fixed potential problems in the system that pumps cooling ocean water into the facility.
Engineers at the Plymouth plant declared on Thursday that five pumps were “inoperable” – even though they still worked – because of possible problems with electrical shutdown relays.
A plant spokeswoman says engineers made a “conservative decision.”
The Nuclear Regulatory Commission was informed and issued a notice that would have required the plant to shut down if the issue was not resolved within 24 hours.
Plant owner Entergy Corp. modified the circuits to fix the issue and the systems were declared operable on Friday morning within the 24-hour window.
An NRC spokesman says there was never a danger to public safety and the plant continued operating at full capacity.