LaSalle 1 trips offline, unscheduled outage underway

[News Wire]

LaSalle 1 began an unscheduled forced short outage on May 27, 2026, ending a 147-day streak of outage-free operation. NukeWorker projections estimate the duration of this event at about 4 days.

This forced outage is the first for the 1,131-MW General Electric BWR/5 unit in 2026, compared to two forced outages recorded during 2025. Constellation Nuclear operates this unit along with 20 other U.S. nuclear units. Across the industry, the current fleet capacity factor is 94.4 percent, with 94 units online, four in refueling, and one unit currently in an unscheduled outage.

MARSEILLES, IL — An unscheduled outage at LaSalle 1 began on May 27, 2026. The NRC has not yet issued an event notification for this trip; this post will be updated if one is filed.

This is the first unscheduled outage of 2026 for the unit, which had 2 unscheduled outages in all of 2025. The unit had just returned to service on Feb 27, 2026 from a 19-day refueling outage.

Based on the unit's history and similar reactor types, projected total duration is about 4 days. NukeWorker's forced-outage projection scores 95% duration accuracy for this unit, with past calls usually landing within about 2 days.

Across the U.S. fleet of 94 commercial reactors, today's combined capacity factor is 94.4% (4 currently in refueling, 1 in unscheduled outages), above the 87.0% baseline for this month over the past five years. At the same site, LaSalle 2 is running at full power.

LaSalle 1 is a 1,131-MW General Electric BWR/5 operated by Constellation Nuclear (commercial operation since 1984). At full power, it supplies enough electricity for roughly 905,000 homes. The utility operates 20 other U.S. nuclear units. Its operating license runs through 2042 (renewed in 2016).

Heading to Marseilles, IL for support work? Current per-diem averages $110/night lodging plus $68/day meals (total $178/day), and Unemployment Benefits are $859 weekly. See open nuclear jobs in Illinois on NukeWorker.

View LaSalle 1's ratings, history, projections, and current status on NukeWorker. This thread will be updated when the unit returns to service.

Want the full picture? Subscribe to the NukeWorker outage schedule for every current and upcoming U.S. nuclear outage.

Sources: NRC Daily Reactor Power Status reports, utility-published outage schedules, and NukeWorker's projections.