Democrats alarmed as Trump eyes weapons material to fuel nuclear reactors

The scramble to build new reactors to supply power to AI data centers may include plutonium from the nation’s nuclear deterrent.

Politico, By Zack Colman, 09/29/2025

The Trump administration is considering a proposal to divert plutonium that plays a central role in the U.S. nuclear weapons stockpile to fuel a new generation of power plants, according to an Energy Department official and previously undisclosed department documents.

The proposal calls for the department to alter the plutonium so it can be used by civilian power companies, including startups pitching advanced reactor designs. It’s part of a broader push by President Donald Trump to convert tons of the Energy Department’s plutonium to civilian use, a notion that some lawmakers argue would undermine the U.S. weapons program for the benefit of untested private companies.

The initiative would involve harvesting plutonium on a large scale: According to a department official and a July 31 DOE memo seen by POLITICO, more than a fifth of the plutonium needed to meet Trump’s mandates would come from the highly radioactive spheres manufactured for the cores of nuclear weapons. DOE already faces a crunch to make more of those spheres, known as plutonium pits — it’s lagging behind Congress’ demands that it boost pit production to modernize the country’s nuclear deterrence.

The department is “not meeting the current pit manufacturing schedule,” said a former DOE official who is familiar with the department’s plutonium reserves. “So to make pit plutonium available would be a huge shift, and I’d be shocked.”

Both the current and former officials were granted anonymity to share sensitive details about national security matters.

Trump didn’t mention the pits in a May executive order in which he directed DOE to draw from another source — its stores of surplus plutonium — to help revive the nuclear power industry and meet the soaring electricity demands of data centers used in artificial intelligence. The U.S. officially halted its program that made weapons-grade plutonium in 1992.

The department declined to confirm or deny any details of its plutonium plans in response to questions from POLITICO.

“The Department of Energy is evaluating a variety of strategies to build and strengthen domestic supply chains for nuclear fuel, including plutonium, as directed by President Trump’s Executive Orders,” the department said in a statement. “We have no announcements to share at this time.”

The White House referred POLITICO’s questions about the plutonium plans to DOE. The Defense Department referred questions to the White House.

Government watchdogs and congressional Democrats have spent weeks objecting to the entire notion of transferring government-owned plutonium to the power sector. Such a move “goes against long-standing, bipartisan U.S. nuclear security policy,” Democratic Sen. Ed Markey and Reps. Don Beyer and John Garamendi wrote in a Sept. 10 letter to Trump. “It raises serious weapons proliferation concerns, makes little economic sense, and may adversely affect the nation’s defense posture.”

In a separate Sept. 23 letter to Trump, Markey said he was concerned that Energy Secretary Chris Wright was pushing the plutonium proposals to help a Californian nuclear power startup named Oklo, on whose board Wright once sat………….

Oklo spokesperson Paul Day declined to comment on Markey’s concerns of a possible conflict of interest. He also declined to comment on how much plutonium the company intends or has agreed to acquire from DOE. He said DOE “has not, as far as we know, established a plutonium fuel program.”

One nuclear safety watchdog echoed many of the Democrats’ concerns in an interview, saying DOE’s proposal could hollow out the nation’s nuclear defenses and compromise the Pentagon’s long-term deterrence strategy. And it appears to be happening without coordination with the Defense Department, said Hans Kristensen, director of the nuclear information project at the Federation of American Scientists, a nonprofit group that focuses on global security.

…………………………………………..U.S. civilian reactors now use only uranium for their nuclear fuel, but some reactors under development are planning to use plutonium. Spent plutonium from reactors is far more radioactive than uranium — and could pose a greater security risk than uranium if it were to fall into the hands of hostile nations or terrorist groups.

………………………………………… The DOE memo called for delivering 18.5 metric tons of the government’s surplus plutonium and an additional 6.5 metric tons pulled from “material in classified form once it has been declassified.” That latter term, the current DOE official who spoke to POLITICO said, refers to the plutonium pits, whose shape and characteristics can reveal information about nuclear weapons.

The company where Wright was once a board member, Oklo, wants to take advantage of the plutonium fuel program. Unlike its competitors, Oklo’s fast-neutron reactors can use plutonium as a “bridge” fuel to get around the bottlenecks that exist in obtaining the more desirable grades of uranium, CEO Jacob DeWitte told POLITICO in an interview.

DeWitte said Oklo has not publicly revealed how much plutonium the company is seeking to run its new reactors, or from where precisely it plans to obtain that plutonium. He also said the Trump administration has not detailed exactly how much plutonium it will make available, noting that “there is disagreement” over how much surplus plutonium the federal government can hand off before harming nuclear deterrence……………………………………………………………………………………………………………………………………… https://www.politico.com/news/2025/09/29/trumps-nuclear-power-push-stirs-worries-about-us-weapons-stockpile-00583424