Total megawatts of U.S. nuclear capacity offline right now (units in outages plus reduced power).
13,789
MW Offline
Percentage of total fleet capacity currently online and generating power.
85.8%
Fleet Online
Refueling outages scheduled for this season. Each one is a hiring window.
24
Fall 2026 Outages
Units currently at 0% power (likely in an outage or shutdown).
13
Units Offline
Units operating between 1-99% power (excluding known startups or coastdowns).
0
Reduced Power
Units nearing the end of their fuel cycle, gradually lowering power before an outage.
4
Coastdown
Units increasing power following an outage or scram.
1
Starting Up
Units on a qualifying Breaker-to-Breaker run: continuous operation exceeding their cycle-adjusted threshold with no trips to 0% power.
5
Breaker-to-Breaker
Site NewsNEW Our long-range outage projections just got sharperNukeWorker's Outage Schedule gives you two things: validated dates for the coming season, and our own long-range projections for the seasons beyond, 18 to 24 months out, before the utilities publish their dates.Today we upgraded the engine behind those long-range projections. Measured against the dates utilities have since confirmed, the new engine is 28% better at predicting long-range (18 to 24 month) start dates.See how we score ourselves on the Accuracy Scorecard.
Rennhack
RennhackFallen:NEW Roger SlocumRoger passed away recently. He retired from Oconee after 46 years and then came back and worked some more. Roger was a long time Rad tech and ALARA planner. A great many people are very sad right now. He will be missed.
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Nuclear NewsNEW Eliminating Heat Risks in Nuclear Cleanup: A DOE Contractor’s High-Tech BlueprintSavannah River Mission Completion deployed wearable physiological monitors for its liquid waste cleanup workforce. The devices track metrics like heart rate and core temperature in real time. Safety personnel used the technology during summer operations to prevent heat illness among workers wearing heavy personal protective equipment. Traditional heat stress management relied on scheduled breaks and visual observations. The new system replaces these reactive measures with continuous data streams and automated alerts for supervisors. Expanding wearable technology deployment helps nuclear facilities protect personnel from environmental hazards without halting critical operational tasks. For organizations like the Savannah River Mission Completion (SRMC), a liquid waste contractor for the U.S...
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Nuclear NewsNEW Developer uses public comment period at Amherst County meeting to unveil plans for a nuclear power pDeveloper Geenex Power announced plans for the Beck Creek Energy project, proposing a small modular reactor facility generating up to 650 megawatts in Amherst County, Virginia. Company representatives introduced the early-stage project during a local board meeting, pointing to proximity to transmission infrastructure near the James River. The project highlights the expanding commercial interest in small modular reactors as developers seek sites with existing transmission capacity. Geenex plans to navigate local rezoning, state evaluations, and federal regulatory reviews before targeting constr...Core Content
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Nuclear NewsNEW Microscopic nuclear fuel particles from Chernobyl still intact after 40 yearsChernobyl nuclear fuel particles remain stable 40 years after disaster Researchers analyzing microscopic radioactive particles from the Chernobyl disaster found that their original uranium fuel structures remain largely intact after forty years. The study reveals that these distinct chemical forms weather at different rates, influencing how radionuclides are released into the environment. Understanding these containment mechanisms helps specialists assess long-term contamination risks and weathering processes within the exclusion zone. A study of six Chernobyl particles found their nuclear fue...Core Content
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Nuclear NewsNEW First Nuclear Clocks Kick Off a Precision RaceTwo independent research teams have successfully built the first operating nuclear clocks using thorium-229. These devices stabilize laser frequencies using transitions between quantum states in atomic nuclei rather than electronic energy levels. While current models do not yet match the stability of leading atomic clocks, they offer significant advantages in robustness and compactness. Because nuclear transitions are less vulnerable to external environmental disturbances, these new instruments could eventually eliminate the need for complex vacuum and laser-cooling systems, opening practical...Core Content
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Nuclear NewsNEW Massachusetts man pleads guilty to selling radioactive material from RussiaJacob D. Miller pleaded guilty to illegally importing and mailing radioactive plutonium through an online element-sales business. Federal prosecutors stated that the Massachusetts man shipped the material to dozens of customers without authorization, violating federal hazardous materials laws. The case highlights ongoing vulnerabilities in the oversight of retail chemical and radioactive sample distribution. Jacob D. Miller, 44, pleaded guilty to illegally importing plutonium and selling it. A Massachusetts man pleaded guilty in a case involving illegally importing and selling radioactive mate...Core Content
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Nuclear NewsNEW EM UpdateCelebrating EM Excellence: Secretary’s Honor Awards; Walsh Advances President Trump’s U.S.-Japan Energy and Nuclear Cleanup Cooperation; and much more! Energy Secretary Chris Wright presented seven Secretary of Energy Honor Awards to Department of Energy Office of Environmental Management employees and teams. Meanwhile, Assistant Secretary Tim Walsh traveled to Japan to advance bilateral nuclear cleanup cooperation and tour the Fukushima Daiichi plant. These recognitions highlight operational milestones in waste vitrification, drone-assisted tank inspections, and the acquisition of high-assay...Core Content
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Nuclear NewsNEW Nano Nuclear seeks to build front-end capabilities with Radnostix assetsNano Nuclear agreed to purchase assets from Radnostix, including an NRC-licensed depleted uranium deconversion facility in Lea County, New Mexico. The pending transaction covers facility infrastructure and intellectual property related to fluorine extraction processes. Execution of the agreement remains subject to approval by federal regulators. The acquisition supports Nano Nuclear's broader strategy to build front-end nuclear fuel cycle capabilities for its microreactor designs. Securing domestic deconversion and fuel manufacturing assets helps developers manage supply chain bottlenecks in t...Core Content
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Nuclear NewsNEW Tritium detector for continuous underground monitoringThe Thomas Jefferson National Accelerator Facility recently signed a formal cooperative research and development agreement with startup Canary Instruments to commercialize a specialized monitoring device. The technology is designed to track radioactive isotopes in groundwater near nuclear fission and fusion facilities. Traditional radioisotope testing relies on periodic manual water sampling, which provides only limited snapshots of environmental conditions. The new device uses unclad scintillating fibers and silicon photomultipliers placed directly in boreholes to capture continuous data. Thi...Core Content
Core ContentNuclear NewsNEW NuCube Energy Advances Integrated Energy Systems Testing at USRELNuCube Energy partnered with the Utah San Rafael Energy Lab and Brigham Young University to test high temperature heat pipe technology. Researchers are utilizing a 250 kilowatt induction furnace to simulate the thermal output of the NuSun microreactor. The setup validates energy conversion and industrial heat applications. The test platform provides a controllable heat source for studying chemical manufacturing, hydrogen production, and power generation using supercritical carbon dioxide. Advanced nuclear developers are increasingly focusing on non electric applications to expand the commercia...Core Content
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Outage NewsNEW Palo Verde 1 begins Fall 2026 refueling outagePalo Verde Unit 1 began a routine refueling outage on October 3, 2026, starting exactly on its scheduled date. The 1,311-megawatt pressurized water reactor enters the maintenance period following a 1,270-day unscheduled-outage-free streak. Operated by Arizona Public Service, the unit had completed about 93 percent of its typical 548-day operating cycle and recorded an 87.8 percent capacity factor during the 2025 cycle. The 45-day scheduled duration compares against a 42.4-day historical average across 18 prior refuels for the plant. Across the broader U.S. fleet, 94 units operated at an 85.4 percent capacity factor, with 12 units currently in refueling outages. TONOPAH, AZ. Refueling activities began at Palo Verde 1 on Oct 3, 2026 . The unit started on the published date (Oct 3, 2026) with...Core Content
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Outage NewsNEW Salem 1 begins Fall 2026 refueling outageSalem 1 began a routine refueling outage on October 4, 2026, starting precisely on its planned date. The PSEG Nuclear plant has a scheduled duration of 50 days for this maintenance period. The 1,153-MW Westinghouse 4-loop pressurized water reactor entered this refueling outage after maintaining a 624-day unscheduled-outage-free streak. Salem 1 had run about 90 percent of its typical 549-day operating cycle following an 85 percent capacity factor during its 2025 cycle. PSEG Nuclear operates two other United States nuclear units, while the broader nuclear fleet records an 85.2 percent capacity f...Core Content
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Outage NewsNEW McGuire 1 completes Fall refueling outage in 29 daysMcGuire 1 began a routine refueling outage on September 5, 2026, concluding after 29 days on October 3. The fall maintenance window ran one day longer than the planned 28 day schedule. Operated by Duke Energy Carolinas, the 1,158-MW Westinghouse pressurized water reactor maintained an unscheduled-outage-free streak of 246 days before the project. The duration ranked as the 13th-longest among the unit's 19 tracked refuels, falling below the historical average of 37.6 days for its 18 prior refuels. Across the broader U.S. fleet, 94 units operated at an 85.2 percent capacity factor while four oth...Core Content
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