Unit 1 at Tennessee Valley Authority’s Sequoyah Nuclear Plant is up and running again after going offline for scheduled refueling and maintenance work.
The 40-year-old reactor unit near Soddy-Daisy, Tenn., stopped generating so crews could replace 85 of the 193 fuel assembles. They also performed nearly 12,000 other activities to inspect, upgrade and repair parts within the power facility.
“The work we performed together (with contracted partners) in this outage puts Unit 1 in the best position to continue to operate safely and reliably over the next 18-month cycle,” said Tom Marshall, Sequoyah site vice president for TVA. “Each of our team members takes great pride in the work they do to ensure the plant continues to provide safe, reliable, low-cost, carbon-free electricity to the people and businesses of the Tennessee Valley.”
Sequoyah Unit 1 has a capacity of more than 1.2 GW, enough to power about 650,000 homes. At the center of the unit is a Westinghouse pressurized water reactor with a lifetime capacity factor of about 76 percent, according to reports.
Unit 1 now will operate and generate carbon-free electricity over 18 months until the next refueling and maintenance outage. Other major maintenance activities included replacing or refurbishing a number of motors, valves and other plant components, as well as several modifications for improving safety.
The second unit at Sequoyah completed its most recent refueling and maintenance work in May 2020.
Both projects were undertaken and completed using safe work practices and COVID-19 protocols. Those included health screenings with the use of thermal scanning devices at plant entrance points, face-mask requirements and social distancing.
This spring, TVA has safely completed scheduled refueling outages at Browns Ferry Unit 2 and Sequoyah Unit 1. Watts Bar Unit 1 is scheduled to begin its next refueling outage this fall.
Sequoyah Unit 1 is one of seven operational TVA nuclear reactors across the Valley. TVA’s nuclear fleet is the third largest in the nation, providing more than 40% of all electricity used by nearly 10 million people in the Tennessee Valley.
Nuclear power plants generate 20 percent of the U.S. capacity mix and more than half of the carbon-free electricity nationwide.
— — — — —
Optimizing Plant Performance is a key topic within the POWERGEN content series. It was the focus of last month’s POWERGEN+ online. Click here to watch sessions on demand. Plant performance and the future of nuclear energy also are central to content for the live POWERGEN International event planned Jan. 26-28 in Dallas. The POWERGEN Call for Speakers is still open and seeking submissions for tracks such as Decarbonization, Digitalization, Energy Storage Breakthroughs, the Future of Electricity, Hydrogen: What’s New, Optimizing Plant Performance, the New Energy Mix (on-site power) and Trends in Conventional Power. Click here to see more and submit a session idea.