Edwin Lyman
@nucsafetyucs.bsky.social
350 followers 50 following 170 posts
Director of Nuclear Power Safety, Union of Concerned Scientists, Washington, DC.
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Edwin Lyman @nucsafetyucs.bsky.social · 6d
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...
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
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Edwin Lyman @nucsafetyucs.bsky.social · 6d
www.washingtonpost.com/world/2025/1...
Zelenskyy warns Russian drones endanger safety at Chernobyl and at Europe's biggest nuclear plant
Russia’s continued attacks on Ukraine’s power grid are raising concerns about nuclear safety
www.washingtonpost.com
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Edwin Lyman @nucsafetyucs.bsky.social · 7d
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...
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
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Edwin Lyman @nucsafetyucs.bsky.social · 7d
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
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Edwin Lyman @nucsafetyucs.bsky.social · 14d
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
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Edwin Lyman @nucsafetyucs.bsky.social · 15d
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.
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Edwin Lyman @nucsafetyucs.bsky.social · 18d
united24media.com/latest-news/...
IAEA Calls for Zaporizhzhia Nuclear Plant to Return to Ukrainian Control
The IAEA calls for the return of the Zaporizhzhia Nuclear Power Plant to Ukraine, emphasizing its operation under Ukrainian authority, as supported by 62 nations.
united24media.com
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Edwin Lyman @nucsafetyucs.bsky.social · 19d
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
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Edwin Lyman @nucsafetyucs.bsky.social · 20d
spectrumlocalnews.com/nys/central-...
Former Rep. Brandon Williams confirmed by U.S. Senate for nuclear security role
Williams served a single term in Congress in New York.
spectrumlocalnews.com
Edwin Lyman @nucsafetyucs.bsky.social · 20d
www.nrc.gov/docs/ML2526/...
www.nrc.gov
Edwin Lyman @nucsafetyucs.bsky.social · 20d
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
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Edwin Lyman @nucsafetyucs.bsky.social · 20d
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
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Edwin Lyman @nucsafetyucs.bsky.social · 23d
On Saturday the Hatch-2 #nuclear reactor in #Georgia was manually scrammed at 70 percent power when both reactor recirculation pumps stopped working during a test of the main turbine control valve. The reactor was still down this morning.
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Edwin Lyman @nucsafetyucs.bsky.social · 27d
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.
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Edwin Lyman @nucsafetyucs.bsky.social · Sep 8
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
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Edwin Lyman @nucsafetyucs.bsky.social · Sep 7
I don't usually post one-sided stories but I cannot find any comment by Ukraine or IAEA yet.

I don't believe either side would intentionally target the plant. This is most likely collateral damage from drones that have been jammed or shot down.
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Edwin Lyman @nucsafetyucs.bsky.social · Aug 4
This takes the word "lunacy" to a whole new level
politico.com
Politico @politico.com · Aug 4
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
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Edwin Lyman @nucsafetyucs.bsky.social · Aug 4
Dominion says it is planned maintenance, according to Platts.
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Edwin Lyman @nucsafetyucs.bsky.social · Jul 28
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...
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
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Edwin Lyman @nucsafetyucs.bsky.social · Jul 27
If they had financing, they would have mentioned it. Perhaps they think Trump will be so flattered he will order Congress to give the project $80 billion.
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Edwin Lyman @nucsafetyucs.bsky.social · Jul 26
Is there any evidence that this company has secured even a fraction of the tens of billions in financing it would need for those four AP1000s?
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Edwin Lyman @nucsafetyucs.bsky.social · Jul 24
Yes indeed, xenon poisoning
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Edwin Lyman @nucsafetyucs.bsky.social · Jul 24
On Tuesday the Susequehanna-1 #nuclear reactor in #Pennsylvania was manually scrammed at full power after the main transformer experienced a cooling loss. The reactor is still down today. Should be a warning to Amazon about the reliability of this plant to power its data center.
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Edwin Lyman @nucsafetyucs.bsky.social · Jul 22
9/9. Strong and independent nuclear oversight protects not only the public but also the industry. Just imagine the worldwide reaction if a serious accident occurred at a new reactor in the United States because a safety problem was overlooked in the NRC's rush to license.
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Edwin Lyman @nucsafetyucs.bsky.social · Jul 22
8/9. These changes will damage NRC's reputation among other nations as a “gold standard” regulator and lead them to distrust its safety approvals of US #nuclear technologies.
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