PLYMOUTH — A Monday night loss of outside power has forced the Pilgrim nuclear plant offline for the fourth time this year.
Carol Wightman, a spokeswoman for Pilgrim’s owner Entergy, said Tuesday morning that the plan automatically shut down at 9:21 p.m. Monday, when an NStar power line into the plant went out of service.
Wightman said Pilgrim gets its outside power from two 345-kilovolt lines. NStar had already taken one of the lines out of service for maintenance when the second line failed.
Wightman said the federal Nuclear Regulatory Commission was informed as soon as the shutdown occurred.
She said the shutdown had no effect on the health or safety to the public or Pilgrim workers. She said the 685-megawatt plant will return to production when NStar completes repair and restoration of the two power lines.
Wightman said emergency generators began operating as soon as the NStar line went out of service, and that the generators are safely powering the plant.
Meanwhile, she said Pilgrim crews are doing maintenance that can’t be performed while the plant is in production.
Pilgrim has now been offline for 73 of 288 days thus far this year, though 46 of those days were for planned maintenance and refueling.
The plant was offline three times earlier this year from pump-related problems. The plant was down for a week in January, and again in late August and early September.
110 Pilgrim violations, 2000-2012
The Pilgrim nuclear power plant in Plymouth experienced 108 lower-level and two higher-level safety violations from 2000 through 2012. The violations were included in a congressional study expected to be released this month showing that safety violations at nuclear plants across the country varies dramatically from region to region. The Government Accountability Office report obtained by The Associated Press suggests inconsistent enforcement of regulations could be responsible.
A Pilgrim spokeswoman said they’re committed to addressing even minor issues and that enhancing safety is their top concern.
Twenty-six Northeast reactors reported more than 2,500 violations, about 97 per reactor, during the 13-year period. Lower-level violations pose very low risk. Higher-level violations range from low to high safety significance, such as an improperly maintained electrical system that caused a fire affecting a plant’s ability to shut down safely.
Shutdowns at Pilgrim in 2013
Jan. 10: Trip of both recirculation pumps. Returned to full power on Jan. 17.
Jan. 20: Leak in a safety-relief valve. Returned to full power on Jan. 24.
Feb. 8: Offsite power loss and main generator load reject. Returned to full power on Feb. 16.
April 18: Refueling. Returned to full power on June 3.
Aug. 22: Electrical problems with water pumps. The plant restarted on Aug. 26, but was shut down by a steam leak on Sept. 8 before reaching full power. Returned to full power on Sept. 21.
Oct. 14: Loss of offsite power.
Source: Nuclear Regulatory Commission