The Tennessee Valley Authority (TVA) confirmed early Sept. 21 that it has returned one nuclear unit to service after an unplanned outage while started a planning refueling and maintenance outage at another nuclear plant.
Sequoyah Unit 1 returned to operation on Sunday, Sept. 20, after repairing an issue with one of the unit’s instrumentation power boards, a TVA spokesperson said. Sequoyah 1 had gone offline due to the unplanned outage on Sept. 14.
Sequoyah Units 1 is a pressurized water reactors (PWR) with a generating capacity in excess of 1,100 MW. The Sequoyah complex is located in Hamilton County, Tenn.
Also on Sunday, Watts Bar Unit 1 was taken offline as part of a scheduled refueling and maintenance outage.
“All systems performed as designed and the Watts Bar team has already begun some of the more than 10 thousand work activities scheduled,” the TVA spokesperson told GenerationHub.
Like most other utilities, TVA does not disclose planned outage durations. Located in Rhea County, Tenn., Watts Bar 1 is a roughly 1,100-MW PWR. TVA is also in the final stages of completing the Watts Bar 2 nuclear unit for commercial operation.