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Nuclear Event – Accident Mitigation, Emergency Core Cooling Systems: Browns Ferry Nuclear Plant, Unit 3, Alabama

2016/06/09

North America – USA | State of Alabama, Athens, Browns Ferry Nuclear Plant
Location: 34°42’14.0″N 87°07’07.0″W
Present Operational Age: ~43 years
Event: ACCIDENT MITIGATION

Nuclear Event in USA on Wednesday, 08 June, 2016 at 10:37 [CDT]

HIGH PRESSURE COOLANT INJECTION INOPERABLE

“At 0800 CDT on 6/8/2016, 3-SR-3.5.1.7, ‘HPCI [High Pressure Coolant Injection] Main and Booster Pump Set Developed Head and Flow Rate Test at Rated Reactor Pressure’ periodic surveillance was being performed. As part of the surveillance procedure, HPCI was declared inoperable per Technical Specification (TS) Limiting Condition for Operation (LCO) 3.5.1 Emergency Core Cooling Systems (ECCS) – Operating, Condition C at 0925. At 1037, the HPCI turbine was started and a turbine trip alarm was received as well as large swings observed on the suction pressure indicator and slow turbine response. The control room operator then manually tripped the HPCI turbine due to the abnormal indications received.

“HPCl is a single train safety system and this notification is being made in accordance with 10 CFR 50.72 (b)(3)(v)(D).

“The NRC Resident Inspector has been notified.”

Source: NRC  Event Number: 51996


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