a 1,260 MWe net BWR/4 built by General Electric that originally came online on August 18, 1976 with a capacity of 1,105 MWe net, and is licensed to operate through July 2, 2036. Unit 3 returned to service in 1995 after all three units were shut down in 1985 for maintenance and repairs. Unit 3 generated 9,651 GWh in 2017, achieving a capacity factor of 99.70%. The power update of 155 MWe was completed in July 2018. Additional incidents March 19, 1985 TVA decided to shut the entire plant down and keep it shut down indefinitely in order to focus on making improvements to all three units in order to bring it back into regulatory compliance following extremely negative assessments from the NRC. Unit 2 finally resumed operation on May 24, 1991, with Unit 3 following it on November 1, 1995, although Unit 1 did not resume operation until June 2, 2007. May 10, 1986 Cooling tower #4 (which was wide, long, and four stories tall) was destroyed in a fire caused by sparks from the electrical cooling fans in the tower hitting the abnormally dry redwood slats within the tower on May 10, 1986. During normal operation, water was kept flowing near-continuously over the redwood slats within the tower, but after close to two months of inactivity, the slats were very dry and extremely flammable. $5 million of damage was done. May 23, 1996 Cooling tower #3 (which was in the process of being refurbished at the time) was heavily damaged in a fire on May 23, 1996, with about 80% of the tower destroyed. August 19, 2006 At 11:05 AM on August 19, 2006, Unit 3 was manually scrammed due to loss of both the 3A and 3B Reactor Recirculation pumps. The initial investigation found the Variable Frequency Drive (VFD) microprocessors non-responsive. The root cause of the event was that the VFD controls malfunctioned due to excessive traffic on the connected plant Integrated Control System (ICS) network. Corrective actions included installing network firewalls that limit the connections and traffic to the VFD controllers. April 27, 2011 At 5:01 PM on April 27, 2011, all three reactors scrammed due to loss of external power caused by a tornado in the vicinity of the plant. Control rod insertion and cooling procedures operated as designed with no physical damage or release of radiation. Diesel backup generators provided power after a brief