TVA Sequoyah 2 goes offline

The Tennessee Valley Authority (TVA) Sequoyah 2 nuclear reactor was unexpectedly forced to go offline during the evening on March 2, according to a report filed with the Nuclear Regulatory Commission (NRC).

The unit “automatically tripped” at about 6:45 p.m. EST, according to the NRC event notification report.

“The immediate cause of the trip was a main generator C phase differential relay actuation. There was no associated work in progress related to this and all systems were normally aligned. It is currently not understood why the relay actuated,” according to the report.

Sequoyah Unit 1 continues to operate at 100% generation. “There was no impact on public health and safety. Post-trip investigation is in progress and planned restart timeline has not yet been determined,” according to the report.

Sequoyah Units 1 and 2 are both roughly 1,100-MW pressurized water reactors (PWRs) located in Soddy Daisy, Tenn.

About Wayne Barber 4201 Articles
Wayne Barber, Chief Analyst for the GenerationHub, has been covering power generation, energy and natural resources issues at national publications for more than 20 years. Prior to joining PennWell he was editor of Generation Markets Week at SNL Financial for nine years. He has also worked as a business journalist at both McGraw-Hill and Financial Times Energy. Wayne also worked as a newspaper reporter for several years. During his career has visited nuclear reactors and coal mines as well as coal and natural gas power plants. Wayne can be reached at wayneb@pennwell.com.