Dominion's Millstone-2 nuclear power unit in Waterford, Connecticut, was shut at 1 pm EST (1800 GMT) Tuesday "to address an oil leak from a reactor coolant pump," plant spokesman Kenneth Holt said in an email Wednesday.
Holt said he cannot comment on when the 918-MW unit is expected to return to service.
The oil leak is "a different leak" from the one that required Millstone-2 to shut Sunday, though it is from the same coolant pump, Holt said, without providing details.
The 1,276-MW Millstone-3 reactor was operating at 100% of capacity early Wednesday morning, the US Nuclear Regulatory Commission said in its daily reactor status report.
