FW: Reuters: "U.S. not planning nuclear explosions at this time, energy secretary says"
Ellen Thomas
From:
Daryl G. Kimball <dkim...@armscontrol.org>
Sent: Sunday, November 2, 2025 12:56 PM
Subject: Reuters: "U.S. not planning nuclear
explosions at this time, energy secretary says"
Well, four days after Trump’s initial garbled social media post about to "directing the Pentagon to start testing our Nuclear Weapons on an equal basis," we have a reassuring clarification from the U.S. Secretary of Energy Christopher Wright.
Wright says the U.S. plans to continue "non-critical tests" (which are technically referred to as “subcritical experiments”) that do not produce a self-sustaining, supercritical chain reaction.
Subcritical experiments, which pose their own complications, are not prohibited by the CTBT. (For more detail on that, see these two Obama-era State Department Fact Sheets "On the Scope of the CTBT" https://2009-2017.state.gov/t/avc/rls/212166.htm and "P-5 Statements on CTBT Scope" https://2009-2017.state.gov/t/avc/rls/173945.htm )
For more on subcritical experiments, see:
- "SPECIAL REPORT: A Former Nuclear Test Site’s New Role” in Arms Control Today from Jan/Feb. 2024 (on an NGO experts site visit to Nevada and the primary underground subcritical experiments facility).
- "Managing an Arsenal Without Nuclear Testing: An Interview With Jill Hruby of the U.S. National Nuclear Security Administration,” in Arms Control Today, December 5, 2023.
Let’s hope this is the final word for now, but we cannot let our guard down with this crazy stupid administration.
On Friday, the U.S. was the only state to vote “no” in the UN First Committee on the resolution expressing support for the CTBT and the global nuclear test moratorium.
- Daryl Kimball
_______________
US not planning nuclear explosions at this time, energy secretary says
By Reuters
November 2, 20252:37 PM EST Updated 26 mins ago
WASHINGTON, Nov 2 (Reuters) - The nuclear weapons testing ordered by U.S. President Donald Trump will not involve nuclear explosions at this time, Energy Secretary Chris Wright said on Sunday.
"I think the tests we’re talking about right now are system tests," Wright said in an interview with Fox News. "These are not nuclear explosions. These are what we call non-critical explosions."
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The testing involves all the other parts of a nuclear weapon to make sure they are functioning and can set up a nuclear blast, said Wright, whose agency is responsible for testing U.S. nuclear weapons.
The tests will be carried out on new systems to help ensure replacement nuclear weapons are better than previous ones, Wright said on Fox News' "The Sunday Briefing.”
Just before his meeting with Chinese leader Xi Jinping in South Korea on Thursday, Trump said he ordered the U.S. military to immediately restart the process for testing nuclear weapons after a halt of 33 years, a move that appeared to be a message to rival nuclear powers China and Russia.
He reaffirmed his comments on Friday but did not answer directly when asked whether that would include underground nuclear tests that were common during the Cold War.
The United States conducted nuclear test explosions in the 1960s, 1970s and 1980s, Wright said, and collected detailed information and measurements on the blasts.
"With our science and our computation power, we can simulate incredibly accurately exactly what will happen in a nuclear explosion," Wright said.
"Now we simulate what were the conditions that delivered that, and as we change bomb designs, what will they deliver?"
Reporting by Doina Chiacu; Editing by Sergio Non and Chris Reese
____________________
Daryl G. Kimball (he/him)
Executive Director
Arms
Control Association
202-463-8270 x107
@DarylGKimball and @armscontrolnow
