The US Energy Information Administration published charts on scheduled and seasonal availability across the US nuclear fleet, using data from the Nuclear Regulatory Commission.

Average summer daily outages in 2024 came to about 2.6 gigawatts, down from 3.1 gigawatts in 2023 and similar to 2022. Outages peaked at 5.7 gigawatts on the last day of August. Planned outages for maintenance and refueling are typically scheduled in the spring and fall, because operators avoid summer and winter, when electricity demand is highest and utilities need reactors available.

As of July 31, 2024, refueling outages at US nuclear plants lasted an average of 34 days, compared with an average of 38 days in 2023. The longest refueling outage was at Sequoyah Unit 2 in Tennessee at 59 days, followed by Surry Unit 1 in Virginia at 58 days. Refueling outages at Fermi Unit 1 in Michigan and at South Texas Project Unit 2 lasted 48 days each.

EIA said several refueling outages that started in September and October 2024 were expected to finish in the second half of the year. The plants listed were Cooper Unit 1 in Nebraska, Arkansas Nuclear One, Comanche Peak Unit 2 in Texas, Byron Unit 2 and Braidwood Unit 1 in Illinois, Beaver Valley Unit 2 in Pennsylvania and Catawba Unit 1 in South Carolina.

The agency maintains a Status of Nuclear Outages page based on NRC data that gives daily operational information on each commercial US reactor. Priority-state plants named in the analysis include units in Tennessee, Texas, Arkansas and South Carolina.

Source: U.S. Energy Information Administration - https://www.eia.gov/todayinenergy/detail.php?id=63624