Browns Ferry Nuclear Plant Scrammed (Shut Down)
- Event Year
- 2006
- Reliability
- Confirmed
- Country
- United States
- Industry
- Power and Utilities
Description
Operators manually scrammed Browns Ferry, Unit 3, following a loss of both the 3A and 3B reactor recirculation pumps. The root cause was the malfunction of the Siemens Perfect Harmony VFD controller due to excessive traffic on the plant ethernet based integrated computer system (ICS) network.
From NRC report dated April 17, 2007:
The licensee determined that the root cause of the event was the malfunction of the VFD controller because of excessive traffic on the plant ICS network.
Impact
A manual scram or shutdown.