The NextEra Energy (NYSE:NEE) Seabrook 1 nuclear unit in New Hampshire went offline unexpectedly early March 2, according to data from the Nuclear Regulatory Commission (NRC).
“The turbine tripped for an unknown cause followed by a reactor trip,” according to an event report filed with NRC. The incident occurred shortly before 3 a.m.
“All systems are functioning as designed,” according to the NRC event report. “Operators have transitioned out of the EOP [Emergency Operating Procedure] network into normal operating procedures. The plant is stable in mode 3.”
“All control rods fully inserted during the trip and no safety or relief valves lifted. The plant is in its normal shutdown electrical lineup. Emergency Feedwater actuation occurred to restore steam generator levels,” according to the NRC report.
The unit was operating at 100% power went the event occurred, according to the NRC report.
“It was an automatic trip and the plant operated as designed,” a NextEra spokesperson said. The plant is in a safe stable condition. There is no timetable on repairs but Seabrook will be back at full power once repairs are completed, the spokesperson said.
Seabrook is a single-unit pressurized water reactor (PWR) located in Rockingham County, N.H. The facility went commercial in 1990. It is listed in GenerationHub data with a generating capacity in excess of 1,200 MW.
Seabrook’s existing license expires in March 2030. The company has filed for a license renewal from the NRC that would extend the operating license another 20 years.