?Total megawatts of U.S. nuclear capacity offline right now (units in outages plus reduced power).
1,252
MW Off
?Percentage of total fleet capacity currently online and generating power.
98.7%
Grid
?Outages scheduled for this season.
34
Spring 2026 Outages
?Units currently at 0% power (likely in an outage or shutdown).
0
Offline
?Units operating between 1-99% power (excluding known startups or coastdowns).
1
Reduce
?Units nearing the end of their fuel cycle, gradually lowering power before an outage.
0
Coasting
?Units increasing power following an outage or scram.
1
Startup
?Units on a qualifying Breaker-to-Breaker run: continuous operation exceeding their cycle-adjusted threshold with no trips to 0% power.
1
B2B
Site NewsNEW Fall 2026 outage schedule releasedThe Fall 2026 U.S. nuclear refueling outage schedule has been released. 25 units are scheduled to refuel this season. See the Fall 2026 schedule on NukeWorker.
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Navy NukeNEW Trump-class Battleship will get same nuclear reactor as Ford aircraft carrierThe U.S. Navy plans to equip its new Trump-class battleships with the A1B nuclear reactor currently used in Gerald R. Ford-class aircraft carriers. This design choice utilizes existing reactor cooling pumps and steam generator technology to provide the endurance required for Pacific operations. The service intends to procure 15 of these vessels by 2036, with development costs projected to reach $46 billion over the next five years. Chief of Naval Operations Adm. Daryl Caudle confirmed the battleship would share several design features with the USS Ford. WASHINGTON — The Trump-class battleship...Core Content
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History & TriviaNEW Striking New Views of the First Atomic Bomb TestRestored Images Show the 1945 Trinity Nuclear Test In Vivid Detail Newly restored photographic records from the 1945 Trinity test provide detailed imagery of the initial fireball and blast dynamics. Captured by cameras in the North 10,000 bunker, these frames offer researchers precise data on the behavior of the detonation. The collection, featured in a new book from the University of Chicago Press, documents the technical challenges faced by early nuclear scientists in measuring the intensity of the first atomic explosion. Forgotten photos of the Trinity detonation show the immensity of the p...Core Content
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History & TriviaNEW Supersonic airliners, ozone, and wildfire smoke: Origins of the nuclear winter tAtmospheric chemists Paul Crutzen and John Birks discovered the nuclear winter theory while modeling the environmental impacts of nuclear war in 1981. Their research indicated that smoke from widespread fires would block sunlight, causing global cooling. This finding emerged from earlier studies on how nitrogen oxides from supersonic aircraft affect ozone. The theory shifted the understanding of nuclear conflict from localized blast damage to global climatic disruption. By demonstrating that nuclear detonations could alter the atmosphere on a planetary scale, these models influenced internatio...Core Content
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History & TriviaNEW 62 years ago today: The USS Nautilus passes under the North PoleThe USS Nautilus completed the first submerged transit of the North Pole on August 3, 1958. This mission demonstrated the long-term operational capabilities of nuclear-powered vessels and necessitated the development of specialized navigation technology for polar environments. The voyage confirmed that nuclear propulsion could sustain extended underwater operations in previously inaccessible regions. Being stuck under the ice with no obvious exit route is a classic movie scene that is guaranteed to instill fear in any audience. There is no doubt that Cmdr. William R. Anderson and the crew of t...Core Content
Core ContentSite NewsPOET: PRA Operating Experience ToolPOET: plant-specific PRA inputs, built from the operating record A new tool on NukeWorker turns the U.S. fleet's day-by-day operating history into initiating-event frequencies and data-analysis parameters, with the Bayesian work shown. If you know someone who does risk or licensing, this is the one to forward.Every commercial reactor files a daily report on its power level. Stacked up over years, that record is the raw material behind a lot of probabilistic risk assessment: how often plants trip, how long they stay down, how much time they spend in each operating state. The hard part has alway...
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HB RobinsonHB Robinson - LodgingStanding Pines is a new option, just 11.7 miles from the plant. Over 100 campsites, all RV sites are full hook ups. Private lake, hiking trails, pet friendly. Onsite laundry, good internet. For more about what we can offer your crew during an outage in Hartsville:
StandingPinesCampground
StandingPinesCampgroundSite NewsNew board, Outage NewsWe've launched a new board, Outage News : a running record of refueling and forced outages across the entire U.S. nuclear fleet.The community has always been good at sharing what's happening on the ground. Outage News sits alongside that as a consistent reference for the whole fleet. What gets posted: Refueling outages: a post when a unit enters a refueling outage, and a reply when it returns to service. Forced outages: a post when a unit trips offline unexpectedly, with a follow-up when it comes back. Every post compares the event to the unit's published schedule and to NukeWorker's predictiv...Rennhack
RennhackSite NewsNew Feature: RadNet Radiation Map Now OnlineNew Feature: RadNet Radiation Map Now Online We're excited to announce a major addition to the Facility Information suite: the RadNet Radiation Map .It brings EPA's environmental radiation data together with our nuclear facility database, giving a national view of environmental radiation alongside the US nuclear fleet. What's New? The map pulls near-real-time data from the nationwide EPA RadNet air-monitor network and layers it with industry context: Environmental Dose Rates: current readings in mrem/h, with the sample time (Eastern) shown for each monitor. Emergency-Classification Reference S...Rennhack
RennhackFallen:Jeff MortonWas just informed that that Jeff Morton pass away. I worked with Jeff at Millstone, Surry and North Anna. I'm sorry to hear of his passing. I wish him peace.DJ@Retired
DJ@Retired
Outage NewsNEW Fall 2025 recap: 22 scheduled refueling outages, 38 forced, 647 planned reactor-daysCompleted refueling outages for the fall 2025 season averaged 36.4 days, exceeding the initial utility schedule average of 29.4 days. All 22 scheduled refueling outages reached completion by the end of the recap window, while 38 forced outages occurred during the same period. The 22 completed refueling outages this season rank 21 out of 26 years when compared to historical fall data since 1999. Schedule adherence data shows 12 of the 22 outages started as expected, with 4 starting early and 6 starting late. Looking ahead, 34 refueling outages are already scheduled for the spring 2026 window, totaling 983 planned reactor-days. Historical averages for fall seasons since 1999 include 25.8 scheduled refueling outages and 38.4 days per outage. Fall 2025 had 22 scheduled refueling outages on uti...Core Content
Core ContentOutage NewsNEW Fall 2026 outage schedule is now open: 25 refueling outages scheduledEarly access to the Fall 2026 U.S. nuclear refueling outage schedule is now open on NukeWorker. 25 refueling outages are scheduled for Fall 2026, totaling 785 reactor-days of planned offline time across the fleet (average 31.4 days each). Scheduled durations range from 16 to 55 days. For comparison, Fall 2025 had 22 refueling outages totaling 801 reactor-days (+3 outages year over year). Across the U.S. fleet of 94 commercial reactors, today's combined capacity factor is 98.0% (1 in unscheduled outages), above the 95.3% baseline for this month over the past five years. The chart above shows ev...Core Content
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Outage NewsSurry 2 completes Spring refuel in 57 days, caps 491-day B2B runSurry 2 completed its spring refueling outage five days ahead of the original 62-day schedule. The unit returned to service on June 7, 2026, after a 57-day maintenance period. This duration ranks as the second-longest among the 19 tracked refuels for the 838-MW Westinghouse 3-loop PWR. The outage exceeded the historical average of 38.2 days for the unit by 18.8 days. Virginia Electric and Power operates three other nuclear units in the United States. At the time of this event, the national fleet maintained a 97.2 percent capacity factor with two other units in refueling outages. Surry 2 entere...Core Content
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Outage NewsMillstone 2 trips offline, unscheduled outage underwayMillstone 2 began an unscheduled forced short outage on 2026-06-05. This event ended the unit's unscheduled-outage-free streak at 1591 days. This forced outage is the first for the 853-MW Combustion Engineering pressurized water reactor in 2026, following a year with zero forced outages in 2025. Dominion Energy Nuclear Conn operates this unit and one other U.S. nuclear unit. Across the 94 units in the current fleet, the capacity factor is 97.3 percent, with one unit currently in refueling and one unit in an unscheduled outage. WATERFORD, CT — Millstone 2 entered an unscheduled outage on Jun 5,...Core Content
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Outage NewsSaint Lucie 2 completes Spring refuel in 48 days, caps 551-day B2B runSaint Lucie 2 completed a refueling outage in 48 days, exceeding its original 30-day schedule by 18 days. The unit entered this spring maintenance period following an unscheduled-outage-free streak of 664 days. This 48-day duration ranks as the sixth-longest among the 18 tracked refuels for the unit. The result is 1.5 days below the 49.5-day average of the previous 17 refuels. Florida Power and Light operates this 987-MW COMB CE PWR alongside three other U.S. nuclear units. Across the industry, 94 units currently maintain a 97.3 percent capacity factor, with two other units, Palisades and Surr...Core Content
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Outage NewsLaSalle 1 trips offline, unscheduled outage underwayLaSalle 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 unsc...Core Content
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Outage NewsOconee 3 completes Spring refuel in 23 days, caps 686-day B2B runOconee 3 completed its spring refueling outage in 23 days, finishing one day ahead of the 24-day schedule. This performance represents a reduction of 13.9 days compared to the average duration of the unit's 15 previous refueling outages. The 23-day duration ranks as the 13th-longest among the 16 tracked refuels for this 859-MW Babcock and Wilcox pressurized water reactor. The unit entered this maintenance period following a 687-day unscheduled-outage-free streak and a 2025 capacity factor of 99.8 percent. Duke Energy Carolinas operates this unit along with six other nuclear units in the United...Core Content
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Outage NewsComanche Peak 2 completes Spring refueling outage in 25 daysComanche Peak 2 completed its spring refueling outage three days ahead of the 28-day schedule. The unit finished the maintenance period in 25 days, which is 4.6 days faster than the average duration of the 18 previous refuels for this reactor. This 25-day duration ranks as the 13th-longest among the 19 tracked refuels for the unit. The reactor entered this outage with an unscheduled-outage-free streak of 229 days and recorded a 98.9 percent capacity factor during the 2025 cycle. Luminant Generation Company operates this 1,195-MW Westinghouse 4-loop PWR and one other U.S. nuclear unit. Across t...Core Content
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Outage NewsFermi 2 trips offline, unscheduled outage underwayFermi 2 ended an 849-day unscheduled-outage-free streak on May 19, 2026. This forced short outage is the first for the unit in 2026, following zero forced outages during 2025. The 1,141-MW General Electric BWR/4 is currently one of one unit in an unscheduled outage across the fleet. MONROE, MI — Fermi 2 entered an unscheduled outage on May 19, 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. Prior to this trip, the unit had run for more than 2 years without an unscheduled...Core Content
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Outage NewsLimerick 1 completes Spring refuel in 23 days, caps 731-day B2B runLimerick 1 finished its refueling outage one day ahead of the 24-day schedule. The 23-day duration marks the fifth-longest among the unit's 14 tracked refuels. This performance follows an 844-day unscheduled-outage-free streak for the unit. 23 days outage · 1 day ahead of schedule · fifth B2B run complete · 1,120 MW back online After 23 days offline for its Spring 2026 refueling outage, Limerick 1 returned to the grid on May 19, 2026 . The outage began on Apr 27, 2026. The published schedule had it at 24 days (Apr 20, 2026 to May 14, 2026), so the actual ran 1 day shorter than planned. It also...Core Content
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Outage NewsQuad Cities 2 completes Spring refuel in 25 days, caps 673-day B2B runQuad Cities 2 completed a refueling outage in 25 days, which was 9 days longer than the planned 16 days. This duration was 0.6 days below the average of 25.6 days recorded across the unit's 13 prior refuels. The outage ended a streak of 1049 days without an unscheduled outage. 25 days outage · 9 days past schedule · fourth B2B run complete · 911 MW back online Quad Cities 2 completed its Spring 2026 refueling outage on Apr 23, 2026 , returning to service after 25 days . The outage began on Mar 30, 2026. The published schedule had it at 16 days (Mar 30, 2026 to Apr 15, 2026), so the actual ran...Core Content
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Outage NewsSouth Texas 1 completes Spring refuel in 33 days, caps 497-day B2B runSouth Texas 1 completed its refueling outage in 33 days, which was one day longer than the planned 32-day schedule. This duration is 13.2 days below the average of the unit's 17 prior refuels. The outage concluded following a 747-day unscheduled-outage-free streak for the 1,280-MW Westinghouse 4-loop PWR. 33 days outage · 1 day past schedule · ninth B2B run complete · 1,280 MW back online South Texas 1 resumed power production on Apr 22, 2026 after a 33-day Spring 2026 refueling outage that began Mar 21, 2026. The published schedule had it at 32 days (Mar 20, 2026 to Apr 21, 2026), so the actu...Core Content
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Nuclear NewsNEW Energy development company inks lease deal for Vermont YankSource: Vermont Public. PowerTransitions has leased the former Vermont Yankee site from NorthStar Group Services for potential redevelopment. The company is evaluating several options for the property, including battery storage, data centers, and small modular reactors. While decommissioning remains ongoing, the site retains a high-voltage switchyard that makes it a viable location for future energy projects. A Texas-based energy development company has signed a lease to use the former Vermont Yankee nuclear power plant property, and the company, among other options, is discussing a new untested class of small nuclear reactors for the property. An energy development company has signed a lease for the former Vermont Yankee nuclear power plant site in Vernon, but it's unclear what they plan...Core Content
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Nuclear NewsNEW The Open Group Publishes Industrial Advanced Nuclear™ Consortium’s Inaugural AppSource: businesswire.com. The Open Group has released a whitepaper from the Industrial Advanced Nuclear Consortium detailing potential deployment scenarios for small and micro modular reactors. The document outlines operational requirements and energy demands for heavy industries looking to integrate nuclear power and process heat directly into their existing facilities and off-grid operations. This initiative aims to bridge the gap between nuclear technology developers and industrial end-users by standardizing requirements for future projects. By aggregating data on energy needs and constrain...Core Content
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Nuclear NewsNEW General Atomics to Design First Full-Scale Fusion Blanket Test FacilitySource: businesswire.com. General Atomics is collaborating with the U.S. Department of Energy and Idaho National Laboratory to design a Fusion Blanket Component Test Facility. The project aims to evaluate integrated blanket systems that capture energy and produce tritium. The facility will utilize existing infrastructure at the company's Magnet Technologies Center in San Diego. Fusion blankets are required to manage heat removal, mechanical stress, and fuel extraction at power plant scales. This facility provides a platform to qualify these components before moving to complex neutron and triti...Core Content
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Nuclear NewsNEW Hatch SLR approved by NRC in under 12 monthsSource: ans.org. The Nuclear Regulatory Commission granted 20-year license extensions for the two boiling water reactors at the Hatch plant in Georgia. This decision concludes the review process in less than 12 months, marking the second time the agency has utilized its expedited timeline for subsequent license renewals. The approval extends the operating life of both units to 80 years total. The Nuclear Regulatory Commission has renewed the operating licenses of Hatch-1 and -2 in under 12 months, the agency announced Friday. Southern Nuclear’s application was accepted by the NRC in June 2025....Core Content
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Nuclear NewsNEW Modular next-gen US nuclear reactor goes criticalSource: New Atlas. The Antares Nuclear Mark-0 test reactor reached initial criticality at Idaho National Laboratory on June 4, 2026. This milestone fulfills a Department of Energy mandate for advanced reactor development using HALEU fuel and passive liquid-sodium heat pipes. The project aims to validate core physics for modular microreactors intended for military deployment by 2028. Nuclear energy in the West took another step forward as the first privately developed, non-light-water reactor to go critical in the United States in more than 40 years reached a major milestone when the Antares Nu...Core Content
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Nuclear NewsNEW Researchers use Argonne supercomputer to illuminate the subatomic particle that Researchers at Argonne National Laboratory used the Polaris supercomputer to generate high-resolution 3D images of the pion. By simulating quark behavior within this subatomic particle, the team mapped the internal structure of the pion. These findings provide a detailed view of how quarks and gluons interact to form matter. This research clarifies the mechanics of the strong nuclear force, which binds protons and neutrons within atomic nuclei. Because experimental data on pions is limited, these simulations provide a framework for upcoming studies at the Electron-Ion Collider. The methodology...Core Content
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Nuclear NewsNEW Report looks into next steps for port calls for nuclear-powered shipsCore Power, Maersk, Lloyd's Register, and the Port of Rotterdam released a joint study evaluating the regulatory and operational requirements for nuclear-powered merchant ships. The report uses a hypothetical container ship call at Rotterdam to identify necessary safety, security, and governance frameworks for integrating nuclear propulsion into existing commercial maritime infrastructure. The findings suggest that regulatory alignment and public acceptance remain the primary obstacles rather than technical limitations. As the International Maritime Organization pursues net-zero emissions by 2...Core Content
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Nuclear NewsNEW California is rethinking nuclear — environmental groups should, tooCalifornia gubernatorial candidates recently reached a consensus to support the continued operation of the Diablo Canyon nuclear power plant beyond 2030. This shift follows Governor Gavin Newsom’s decision to extend the facility's license through 2045, citing the plant's role in maintaining grid stability and meeting the state's carbon-free energy goals. The move highlights a growing divide between traditional environmental organizations and shifting public opinion regarding nuclear energy. While legacy groups continue to oppose nuclear power due to concerns over waste and costs, proponents ar...Core Content
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Nuclear NewsNEW Company proposing nuclear power facility in Kansas plans stock offeringDeep Fission Inc. filed for an initial public offering of 2.5 million shares to raise over $40 million for its underground reactor pilot project in Parsons, Kansas. The company intends to list on the Nasdaq exchange while continuing borehole development and engineering work. Management expects to submit a commercial license application to the Nuclear Regulatory Commission in early 2027 to advance its unproven reactor design. TOPEKA — A company building an underground nuclear reactor in Parsons is planning an initial public offering of 2.5 million shares, planning to raise more than $40 million...Core Content
Core ContentNuclear NewsNEW Tennessee fusion regulations take effectTennessee has established a state-level regulatory framework for fusion energy, becoming the first U.S. state to do so following the Nuclear Regulatory Commission's decision to delegate oversight to Agreement States. The new rules mandate specific personnel training, safety committees, and radiological oversight for facilities like the proposed Type One Energy plant near Oak Ridge. This shift allows for state-specific licensing processes as the industry moves toward commercial deployment. On June 9, Tennessee became the first U.S. state to implement its own regulatory framework for nuclear fusion machines. It’s a notable step in the rapidly developing field of fusion regulation, and will help Tennessee prepare to regulate Type One Energy’s proposed commercial fusion power plant near Oak Ridge. Background and decision: In 2023, the Nuclear Regulatory Commission elected to integrate the regulation of fusion machines into the existing byproduct materials program, rather than classifying them—with commercial fission reactors—as utilization facilities. With this decision made, the onus ha...Core Content
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Nuclear NewsNEW Energy subcommittee discusses nuclear reform bills, draft legislationThe U.S. House Energy and Commerce Subcommittee on Energy reviewed six legislative proposals aimed at streamlining nuclear permitting and regulatory processes. The hearing covered topics including fuel recycling, mandatory NRC hearing requirements, uranium enrichment, and workforce compensation. Lawmakers and industry witnesses discussed how these measures could modernize the current regulatory framework. These proposals seek to reduce administrative costs and project delays by eliminating mandatory uncontested hearings and clarifying licensing pathways for advanced technologies. By addressing...Core Content
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Nuclear NewsNEW Natura Resources Announces Agreement with Quadrant Nuclear Industries for HALEU Natura Resources has entered into a formal agreement with Quadrant Nuclear Industries to secure a long-term supply of high-assay low-enriched uranium for its molten salt reactor fleet. This partnership aims to establish a domestic fuel chain by utilizing QNI's planned production facility at Idaho National Laboratory. The collaboration supports the deployment of advanced reactor designs by ensuring a reliable source of fuel materials. /PRNewswire/ -- Natura Resources LLC (Natura), a developer of advanced liquid-fueled molten salt reactors, is pleased to announce it has entered into a formal......Core Content
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