The Pilgrim nuclear power plant in Plymouth, MA, shut down last weekend so workers could repair what its owners, Entergy Nuclear Operations, called a small steam leak in the plant’s feed water system.
A spokeswoman for the plant said Pilgrim remained offline and there is no timetable for bringing it back online.
Entergy and the Nuclear Regulatory Commission (NRC) said there was no threat to the public.
The plant ended up manually taken down Sunday at 6:30 p.m.
Pilgrim had not returned to full power since a shutdown late last month prompted by a problem with the electrical system that runs the pumps that supply cooling water to the reactor core.
An NRC spokesman said although part of the same system, the current problem was different than the previous issue.