Operators Respond to a Significant Natural Disaster A Personal - PowerPoint PPT Presentation

Browns Ferry Operators Respond to a Significant Natural Disaster A Personal Perspective... 2016 National REP Matt Rasmussen Conference Operations Superintendent Browns Ferry NPP

Browns Ferry Nuclear Plant  3 GE BWR Type 4 Reactors o All with Mark 1 Containments o Commercial Operation  Uni1 1 – August 1,1974  Unit 2 – March 1, 1975  Unit 3 – March 1, 1977  ~3400 MWe Total Generation  ~1400 Employees Located on the Tennessee River Near Athens, Alabama

April 27, 2011  All three units at full power  Severe weather was anticipated in the Tennessee Valley area  One (of eight) Emergency DG was out of service for scheduled maintenance  Severe weather events began early in the day  Other TVA nuclear sites and corporate 0142 PM CDT WED APR 27 2011 offices were also affected by severe PROB OF 2 OR MORE TORNADOES: > 95% weather throughout the day PROB OF 1 OR MORE STRONG /F2-F5/ TORNADOES: > 95% PROB OF 10 OR MORE SEVERE WIND EVENTS: > 95% PROB OF 1 OR MORE WIND EVENTS >= 65 KNOTS: > 95% PROB OF 10 OR MORE SEVERE HAIL EVENTS: > 95% PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES: > 95% PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS: > 95%

Your Main Title 92 TORNADO WARNINGS 31 SEVERE THUNDERSTORM • Your Sub Points WARNINGS 7 FLASH FLOOD WARNINGS 63 ACTUAL TORNADOS 1 TORNADO EMERGENCY

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Take Aways...  BFN operators demonstrated that continuing training at BFN prepared them to respond to the events of April 27, 2011, under very difficult circumstances.  Greater emphasis on consideration of severe weather and loss of offsite power as multi-unit events during simulator training  Additionally, it was noted that due to time constraints simulator scenarios rarely progressed to the point of cooling the reactor down to cold conditions