?Total megawatts of U.S. nuclear capacity offline right now (units in outages plus reduced power).
306
MW Off
?Percentage of total fleet capacity currently online and generating power.
99.7%
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).
3
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.
2
Startup
?Units on a qualifying Breaker-to-Breaker run: continuous operation exceeding their cycle-adjusted threshold with no trips to 0% power.
5
B2B
GeneralNEW New Health Physics Calculator Website? Also, your " link doesn't work." DOES work without the "www."
Rennhack
RennhackFallen: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
Nuclear NewsNEW 'At risk of horrific contamination': The Soviet nuclear submarine wreck that is The Soviet submarine Komsomolets, which sank in 1989, continues to release radioactive material from its reactor into the Norwegian Sea. While deep-sea engineering efforts sealed hull fractures and torpedo tubes in 1996, recent investigations by the Norwegian Radiation and Nuclear Safety Authority confirm that the vessel is currently experiencing sporadic radioactive leaks. These findings highlight the long-term environmental challenges associated with managing sunken nuclear assets in deep-water environments. Although current radiation levels remain low, the ongoing corrosion of the reactor and nuclear-armed torpedoes creates uncertainty regarding future contamination risks. Experts emphasize that the extreme depth of the wreckage complicates potential mitigation efforts, leaving the site...
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Nuclear NewsNEW Constellation invests in Blue EnergyConstellation Technology Ventures has acquired an equity stake in Blue Energy to support the development of prefabricated, modular nuclear power plants. The partnership focuses on a phased deployment strategy that utilizes gas turbines before transitioning to GE Vernova BWRX-300 small modular reactors. This investment aims to reduce construction timelines and regulatory risks for new nuclear projects by leveraging centralized manufacturing at existing shipyards. Blue Energy - a developer of financeable, prefabricated nuclear power plants - has announced a strategic equity investment from Const...Core Content
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Nuclear NewsNEW UMaine researchers developing sensors for monitoring nuclear fusion reactorsUniversity of Maine researchers are developing surface acoustic wave resonator microchip sensors designed to monitor structural integrity and neutron flux within fusion reactors. Supported by Helion Energy, the project aims to produce sensors capable of withstanding extreme heat and radiation levels that exceed those found in conventional fission environments. The team will test these devices under simulated fusion conditions to support the development of future commercial power plants. Engineers are exploring ways to harness nuclear fusion, as it has the potential to generate four times as mu...Core Content
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Nuclear NewsNEW Nuclear energy could be in for a big decadeBloombergNEF projects global nuclear capacity will reach 535 gigawatts by 2036, representing a 44 percent increase from current levels. This growth is driven by 76 reactors currently under construction, with China leading the global expansion. Industry observers are monitoring whether these projects can overcome historical challenges related to cost overruns and construction delays to meet these capacity targets. The global fleet of nuclear power plants is poised to expand quickly as climate goals, security concerns, and rising demand renew interest in the energy… The global nuclear energy ind...Core Content
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Nuclear NewsNEW The human factor in licensing and operating the next generation of nuclear plantThe transition to small modular reactors and microreactors is shifting the operator role from manual control to digital supervision. This change requires a new focus on interface design, situational awareness, and the management of automated systems, as operators move away from physical sensory cues toward screen-based monitoring and diagnostic tasks. These advancements introduce complex human performance challenges, including potential skill degradation and the risks of automation bias. The Nuclear Regulatory Commission is addressing these shifts through 10 CFR Part 53, which mandates human f...Core Content
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Nuclear NewsNEW Halo reactor: US firm unveils commercial plan for 10MWe nuclear reactor based onA California-based advanced nuclear technology company has released a new video titled ‘Powering What’s Next’,... Read the full article at msn.com :Core Content
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Nuclear NewsNEW LLNL, Pacific Fusion partnership advances next-generation pulsed-power technologLawrence Livermore National Laboratory and Pacific Fusion reached a milestone with the SIRIUS pulsed-power prototype, which successfully completed 3,000 shots. This testing confirms the reliability of the impedance-matched Marx generator architecture. The project demonstrates that this design can sustain repeated operations while meeting performance requirements for long-term service life. This development serves as a transition from proof-of-concept to a more mature technology readiness level. By replacing conventional multi-stage pulse compression with a single-step wave-stacking process, th...Core Content
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Outage NewsNEW Fermi 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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We have recently updated the with over 1,500 new aerial and facility images.Some of the late...
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