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Nuclear Event – Automatic Reactor trip: Seabrook Nuclear Generating Station, Unit 1, NH

2016/03/02

Nuclear Event – Reactor Trip

NextEra Energy Seabrook Station, Unit 1.

NextEra Energy Seabrook Station, Unit 1, (2009). Seabrook, New Hampshire, ~ 40 miles (64 km) north of Boston and 10 miles (16 km) south of Portsmouth. Image: Wikimedia Commons

North America – USA | State of New Hampshire,  Seabrook Nuclear Generating Station, Unit 1
Location: 42°53′56″N 70°51′03″W
Present Operational Age: ~26 years
Event: RPS ACTUATION – CRITICAL

Nuclear Event in USA on Wednesday, 02 March, 2016 at 02:53 [EST]

TURBINE TRIP CAUSING A REACTOR TRIP

“The turbine tripped for an unknown cause followed by a reactor trip. All systems are functioning as designed. 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. The plant expects to make a press release.

The licensee notified the NRC Resident Inspector.

Source: NRC  Event Number: 51762


VALID ACTUATION OF EMERGENCY FEEDWATER

“On 3/2/2016, [at] 1312 hours EST, while in the process of a plant cooldown, a valid actuation of the emergency feedwater system (EFW) occurred when B steam generator levels were reduced to 20 [percent]. The lowering level was a result of the unanticipated tripping of the start up feed pump on low condensate storage level while it was the feed source to the steam generators. The start up feed pump was restarted and feed flow had been restored when the actuation took place. The EFW flow was secured per procedure and the start up feed pump remains the feed source to the steam generators.

“This is reportable under 50.72(b)(3)(iv)(A).

“The licensee notified the NRC Resident Inspector.”

Source: NRC  Event Number: 51765

 

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