Edwin Lyman
@nucsafetyucs.bsky.social
Director of Nuclear Power Safety, Union of Concerned Scientists, Washington, DC.
My goodness. On Friday an Unusual Event was declared for more than 3 hours at the Clinton-1 #nuclear reactor in #Illinois after the emergency reserve aux transformer shorted out, causing a loss of offsite power. A worker was electrocuted and killed. A warning sign of the impact of reduced oversight?
November 17, 2025 at 2:43 PM
My goodness. On Friday an Unusual Event was declared for more than 3 hours at the Clinton-1 #nuclear reactor in #Illinois after the emergency reserve aux transformer shorted out, causing a loss of offsite power. A worker was electrocuted and killed. A warning sign of the impact of reduced oversight?
Reposted by Edwin Lyman
🚨 JUST IN: A newly declassified cable reinforces proliferation concerns about high-assay low-enriched uranium fuel, and reveals an urgent need for an international review of #HALEU use, writes Ed Lyman (@nucsafetyucs.bsky.social).
#uranium #enrichment #proliferation #IAEA #safeguards #nukesky
#uranium #enrichment #proliferation #IAEA #safeguards #nukesky
Declassified cable reinforces proliferation concerns about high-assay low-enriched uranium fuel
The declassified document reveals an urgent need for an international review of the proliferation risks of HALEU.
thebulletin.org
November 7, 2025 at 11:28 AM
🚨 JUST IN: A newly declassified cable reinforces proliferation concerns about high-assay low-enriched uranium fuel, and reveals an urgent need for an international review of #HALEU use, writes Ed Lyman (@nucsafetyucs.bsky.social).
#uranium #enrichment #proliferation #IAEA #safeguards #nukesky
#uranium #enrichment #proliferation #IAEA #safeguards #nukesky
Here's a "rubber stamp" amendment to the NRC-DOE MOU on #nuclear innovation that commits NRC to establishing "an expedited pathway to approve advanced reactor designs that have been authorized and tested by DOE." Note: this can only be legally done through rulemaking.
www.nrc.gov/docs/ML2530/...
www.nrc.gov/docs/ML2530/...
November 3, 2025 at 11:21 PM
Here's a "rubber stamp" amendment to the NRC-DOE MOU on #nuclear innovation that commits NRC to establishing "an expedited pathway to approve advanced reactor designs that have been authorized and tested by DOE." Note: this can only be legally done through rulemaking.
www.nrc.gov/docs/ML2530/...
www.nrc.gov/docs/ML2530/...
What's the matter with #Kansas? Some misguided folks want to build a Natrium fast #nuclear reactor there.
kansasreflector.com/2025/11/02/h...
kansasreflector.com/2025/11/02/h...
Hoping Kansas will get ‘advanced’ nuclear energy? Careful what you wish for in the Age of Damocles. • Kansas Reflector
Those vying to bring TerraPower jobs to their communities might want to consider the safety and security risks.
kansasreflector.com
November 3, 2025 at 2:04 PM
What's the matter with #Kansas? Some misguided folks want to build a Natrium fast #nuclear reactor there.
kansasreflector.com/2025/11/02/h...
kansasreflector.com/2025/11/02/h...
For background: www.sfpublicpress.org/exposed-part...
Navy Lab in SF Became Hub for Human Radiation Experiments
From 1946 to 1963, scientists exposed servicemen and dockworkers to radiation through war games, decontamination tests and medical studies.
www.sfpublicpress.org
November 1, 2025 at 12:01 AM
For background: www.sfpublicpress.org/exposed-part...
There is a full-blown radiological contamination incident in Indonesia apparently caused by scrap metal smelting that volatilized cesium-137 from a radiation source that should not have been there, contaminating shipments of frozen shrimp and cloves.
www.kompas.id/artikel/en-p...
www.kompas.id/artikel/en-p...
Cikande's Recovery from Cs-137 Radiation Could Take Months
The government has not yet been able to determine how long the Task Force will take to restore the Cikande Industrial Area from cesium-137 radiation. However, the situation is claimed to still be unde...
www.kompas.id
October 2, 2025 at 3:45 PM
There is a full-blown radiological contamination incident in Indonesia apparently caused by scrap metal smelting that volatilized cesium-137 from a radiation source that should not have been there, contaminating shipments of frozen shrimp and cloves.
www.kompas.id/artikel/en-p...
www.kompas.id/artikel/en-p...
Get this: Oklo now has a "Pluto" fast #nuclear reactor design. Very imaginative. I wonder what type of fuel it will use? Lol
www.energy.gov/articles/ene...
www.energy.gov/articles/ene...
Energy Department Selects Four Companies for Advanced Nuclear Fuel Line Pilot Projects
The U.S. Department of Energy today announced another step forward in the Trump administration’s efforts to strengthen domestic supply chains for nuclear fuel.
www.energy.gov
October 1, 2025 at 12:38 PM
Get this: Oklo now has a "Pluto" fast #nuclear reactor design. Very imaginative. I wonder what type of fuel it will use? Lol
www.energy.gov/articles/ene...
www.energy.gov/articles/ene...
The Nuclear Regulatory Commission is "closed" but "critical" activities, including those outlined in Executive Order 14300, will continue. I can't find the lapse plan online, but this seems to mean that public meetings on advanced #nuclear reactors today have not been canceled. nrc.gov/pmns/mtg
Homepage | Nuclear Regulatory Commission
nrc.gov
October 1, 2025 at 12:30 PM
The Nuclear Regulatory Commission is "closed" but "critical" activities, including those outlined in Executive Order 14300, will continue. I can't find the lapse plan online, but this seems to mean that public meetings on advanced #nuclear reactors today have not been canceled. nrc.gov/pmns/mtg
This month an employee brought beer to the Davis-Besse #nuclear reactor in #Ohio, and personnel failed drug tests at Watts Bar in #Tennessee and South #Texas. If you worked at one of the "Terrible Thirteen," you might want to forget your troubles too. blog.ucs.org/edwin-lyman/...
The Terrible 13: The Worst Safety and Security Violators in the US Nuclear Power Fleet
The US public deserves to have a clear understanding of the safety and security of the nation’s 54 nuclear plant sites (with a total of 94 operating nuclear reactors): and in particular, the plants th...
blog.ucs.org
September 24, 2025 at 12:55 PM
This month an employee brought beer to the Davis-Besse #nuclear reactor in #Ohio, and personnel failed drug tests at Watts Bar in #Tennessee and South #Texas. If you worked at one of the "Terrible Thirteen," you might want to forget your troubles too. blog.ucs.org/edwin-lyman/...
Energoatom reports that the Zaporizhzhia #nuclear plant has lost all off-site power today for the 10th time since the Russian invasion. A precarious situation.
September 23, 2025 at 3:03 PM
Energoatom reports that the Zaporizhzhia #nuclear plant has lost all off-site power today for the 10th time since the Russian invasion. A precarious situation.
The July scram of the Watts Bar-2 #nuclear plant in #Tennessee was caused when water dripping through a hole in the roof short-circuited a breaker, shutting down multiple coolant pumps and the main turbine. TVA, fix the darned roof before buying SMRs. www.nrc.gov/docs/ML2525/...
www.nrc.gov
September 19, 2025 at 5:28 PM
The July scram of the Watts Bar-2 #nuclear plant in #Tennessee was caused when water dripping through a hole in the roof short-circuited a breaker, shutting down multiple coolant pumps and the main turbine. TVA, fix the darned roof before buying SMRs. www.nrc.gov/docs/ML2525/...
Seven allegations have already been filed at the Palisades #nuclear plant in #Michigan this calendar year and the reactor hasn't even been restarted yet. What is going on there?
Homepage | Nuclear Regulatory Commission
nrc.gov
September 18, 2025 at 6:48 PM
The Nuclear Regulatory Commission wants to slash the number of hours it spends inspecting #nuclear reactor safety. security, and emergency preparedness by 34 percent beginning January 1, 2026. There is no justification for such a major cut to its inspections.
adamswebsearch2.nrc.gov/webSearch2/m...
adamswebsearch2.nrc.gov/webSearch2/m...
adamswebsearch2.nrc.gov
September 18, 2025 at 3:00 PM
The Nuclear Regulatory Commission wants to slash the number of hours it spends inspecting #nuclear reactor safety. security, and emergency preparedness by 34 percent beginning January 1, 2026. There is no justification for such a major cut to its inspections.
adamswebsearch2.nrc.gov/webSearch2/m...
adamswebsearch2.nrc.gov/webSearch2/m...
Yesterday an Unusual Event was declared for nearly two hours at the Oconee-1 #nuclear reactor in #SouthCarolina when the reactor coolant system developed a leak of 26 gallons per minute during maintenance of a letdown filter.
September 11, 2025 at 12:51 PM
Yesterday an Unusual Event was declared for nearly two hours at the Oconee-1 #nuclear reactor in #SouthCarolina when the reactor coolant system developed a leak of 26 gallons per minute during maintenance of a letdown filter.
The source of the cesium-137 that tainted the shrimp exports from Indonesia may have come from contaminated scrap metal. This makes a lot of sense and also underscores how sloppy handling of medical radiation sources can have wide-ranging impacts.
www.9news.com/article/news...
www.9news.com/article/news...
www.9news.com
September 8, 2025 at 6:13 PM
The source of the cesium-137 that tainted the shrimp exports from Indonesia may have come from contaminated scrap metal. This makes a lot of sense and also underscores how sloppy handling of medical radiation sources can have wide-ranging impacts.
www.9news.com/article/news...
www.9news.com/article/news...
This takes the word "lunacy" to a whole new level
EXCLUSIVE: Sean Duffy will announce expedited plans to build a nuclear reactor on the moon, his first major action as interim NASA administrator.
Duffy to announce nuclear reactor on the moon
This is the first major agency effort by the interim NASA administrator, who is also the Transportation secretary and a former Fox News host.
www.politico.com
August 4, 2025 at 11:04 PM
This takes the word "lunacy" to a whole new level
I'm really sorry to report that my longtime colleague Dan Hirsch, founder of Committee to Bridge the Gap, has passed away. Dan was a tireless advocate for strengthening security at #nuclear power plants.
www.committeetobridgethegap.org/2025/07/27/d...
www.committeetobridgethegap.org/2025/07/27/d...
Dan Hirsch Has Passed Away
With deep sadness but also with heartfelt gratitude for a life well lived, the Committee to Bridge the Gap announces the death of its founder, Daniel O. Hirsch, on July 19th 2025 at his home in Ben Lo
www.committeetobridgethegap.org
July 28, 2025 at 2:53 PM
I'm really sorry to report that my longtime colleague Dan Hirsch, founder of Committee to Bridge the Gap, has passed away. Dan was a tireless advocate for strengthening security at #nuclear power plants.
www.committeetobridgethegap.org/2025/07/27/d...
www.committeetobridgethegap.org/2025/07/27/d...