?Total megawatts of U.S. nuclear capacity offline right now (units in outages plus reduced power).
175
MW Off
?Percentage of total fleet capacity currently online and generating power.
99.8%
Grid
?Outages scheduled for this season.
25
Fall 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).
2
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.
0
Startup
?Units on a qualifying Breaker-to-Breaker run: continuous operation exceeding their cycle-adjusted threshold with no trips to 0% power.
6
B2B
Nuclear NewsNEW EM UpdateWalsh Visits Idaho Cleanup Project, Highlights EM Support to Nuclear Mission; EM Shares U.S. Vision for Used Nuclear Fuel Capability During Japan Visit; and much more! Assistant Secretary of Environmental Management Tim Walsh recently toured the Idaho Cleanup Project to evaluate progress on waste management and facility decommissioning. The visit highlighted how successful cleanup operations at the Idaho National Laboratory Site enable continued nuclear research by meeting regulatory milestones and clearing space for new experimental activities. These efforts are part of a broader Department of Energy strategy to manage legacy nuclear materials and develop domestic recycling capabilities. By coordinating with international partners in Japan and utilizing advanced testing facilities for was...
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Core ContentNuclear NewsNEW Bacteria can turn toxic uranium into stable, environmentally safe formResearchers from Helmholtz-Zentrum Dresden-Rossendorf and the University of Granada have identified a microbial process that converts dissolved uranium into a stable, solid form. By introducing glycerol to water samples from a flooded mine, the team stimulated bacteria to trap uranium within their cell walls as a persistent iron-uranium compound. This discovery provides a potential alternative to traditional chemical remediation methods for legacy mining sites. The stability of the resulting pentavalent uranium compound suggests that biological in-situ treatment could effectively immobilize he...Core Content
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Nuclear NewsNEW Laser-crystal sensor measures strong magnetic fields in challenging environmentsSandia National Laboratories patented a magneto-optical sensor using rare earth crystals to measure intense magnetic fields and electrical currents. The device utilizes polarized laser light to detect field strength without requiring external calibration. This technology offers increased resilience to radiation and electromagnetic interference, providing a potential alternative for monitoring fusion plasma environments where conventional metallic sensors often fail. Researchers at Sandia National Laboratories have patented a magneto-optical sensor, which uses a rare earth crystal and laser lig...Core Content
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Nuclear NewsNEW NRC accepts Ginna SLR application as Constellation seeks 20-year extensionThe Nuclear Regulatory Commission has docketed Constellation’s application to extend the operating license for the 581 MWe Ginna nuclear plant through 2049. Agency staff will now conduct a formal review of the request, with a 60-day window open for public hearing requests. A final decision is expected within 12 months under the NRC's streamlined renewal process. The Nuclear Regulatory Commission has accepted Constellation’s subsequent license renewal application to extend operations at the Ginna nuclear power plant by another 20 years. If approved, the Ontario, N.Y., facility’s operating licen...Core Content
Core ContentNuclear NewsNEW NASA’s nuclear Mars mission to cost over $2 billionNASA confirmed the Space Reactor-1 Freedom mission will cost at least $2.1 billion. The agency plans to fund the project through fiscal 2029 by reallocating resources from existing exploration accounts. This initiative aims to demonstrate nuclear electric propulsion by launching a reactor-powered spacecraft to Mars in late 2028. The project relies on collaboration with the Department of Energy to design and assemble the reactor. By repurposing hardware originally intended for the canceled Gateway lunar station, NASA intends to accelerate development timelines. This mission represents a shift t...Core Content
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Nuclear NewsNEW Bluecore Energy raises $10M to build portable nuclear reactors on bargesBluecore Energy secured $10 million in pre-seed funding to develop small modular reactors mounted on floating barges. The company plans to use the capital to test reactor pressure vessels and simulate water cooling systems for maritime power delivery. These units aim to provide electricity to ports and data centers by connecting to the grid via subsea cables. Maritime nuclear energy startup Bluecore Energy has raised $10 million in a pre-seed funding round led by Slauson & Co. Maritime nuclear energy startup Bluecore Energy on Tuesday said it had raised $10 million in a pre-seed funding round...Core Content
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Nuclear NewsNEW UH joins Texas' nuclear energy pushThe University of Houston has joined the Texas Nuclear Alliance to support the development of next-generation nuclear power and fusion research. The institution plans to provide workforce training and advanced manufacturing expertise to help the state meet rising electricity demand. This partnership aims to transition nuclear technologies from laboratory settings into commercial applications. Houston is eyeing the next energy technology boom. Setting this to “off” disables targeted advertising and related trackers in your current browser. To fully opt out, you must disable tracking on each bro...Core Content
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Nuclear NewsNEW Natura Resources Receives U.S. DOE Approval of its Nuclear Safety Design AgreemeNatura Resources has finalized a Nuclear Safety Design Agreement with the U.S. Department of Energy to establish a regulatory framework for its liquid-fueled molten salt reactor. This agreement aligns design requirements and safety analysis methodologies to support the authorization of the company's demonstration reactor. The process runs in parallel with ongoing pre-application work at the Nuclear Regulatory Commission for future commercial facilities. /PRNewswire/ -- Natura Resources LLC (Natura), a leading developer of advanced molten salt nuclear reactors (MSR), announced today that the U....Core Content
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Nuclear NewsNEW $40M investment to spur new nuclear developments in Idaho and WyomingThe U.S. Department of Commerce will provide $31 million to the Intermountain-West Nuclear Energy Corridor Tech Hub, supplemented by matching private donations to reach a $40 million total. This funding aims to accelerate the deployment of next-generation reactors, strengthen domestic fuel supply chains, and expand the regional nuclear workforce. Idaho National Laboratory will assist the consortium by providing technical support for regulatory navigation and advanced manufacturing processes. On Monday, the U.S. Department of Commerce announced that its Economic Development Administration (EDA)...Core Content
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GeneralNEW New Health Physics Calculator Website? Always seemed that Rad Pro Calculator was more than adequate for most of us. It does not answer test questions directly. It does require a basic understanding of RP concepts. those interesting in the Rad Pro Calculator, By Ray McGinnis, for comparison.
Rennhack
Rennhack
Fallen:NEW Tom"Shine"KellyThank you for sharing. I worked with him and his brother back in the late 80's early 90's with ARC.Rennhack
Rennhack
Outage NewsFermi 2 trips offline, unscheduled outage underwayFermi 2 began a forced short unscheduled outage on 2026-07-04, ending a 44-day unscheduled-outage-free streak. This event marks the second forced outage for the unit in 2026, following zero forced outages during 2025. The 1,141-MW General Electric BWR/4 is currently the only unit in the fleet in an unscheduled outage. MONROE, MI. Fermi 2 dropped offline on Jul 4, 2026 , beginning an unscheduled outage. The NRC has not yet issued an event notification for this trip; a follow-up reply will be posted here if one is filed. This is the second unscheduled outage of 2026 for the unit. Across the U.S. fleet of 94 commercial reactors, today's combined capacity factor is 98.4% (1 unit in an unscheduled outage), above the 97.8% baseline for this month over the past five years. While the unit is down,...Core Content
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Outage NewsWatts Bar 2 refuel pulled forward 7 days: now Nov 6The refueling schedule for Watts Bar 2 has been revised to start on 2026-11-06, which is 7 days earlier than the previous start date of 2026-11-13. The scheduled duration for the outage has also been adjusted from 28 days to 29 days. Watts Bar 2 's next refueling outage has been pulled forward by 7 days in the utility's published schedule. The new scheduled start is Nov 6, 2026 , moving from a previous schedule of Nov 13, 2026. Scheduled duration also revised: now 29 days , 1 day longer than the previously scheduled 28. For workers planning to support this outage, the revised window changes th...Core Content
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Outage NewsWaterford 3 refuel pushed back 17 days: now Oct 17The refueling schedule for Waterford 3 has been revised, moving the start date from September 30, 2026, to October 17, 2026. This adjustment represents a 17-day delay for the beginning of the outage. The planned duration for the event has also been modified, decreasing from 40 days to 25 days. Waterford 3 's next refueling outage has been pushed back by 17 days in the utility's published schedule. The new scheduled start is Oct 17, 2026 , moving from a previous schedule of Sep 30, 2026. Scheduled duration also revised: now 25 days , 15 days shorter than the previously scheduled 40. For workers...Core Content
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