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A Senate measure allowing the temporary storage of spent nuclear fuel from nuclear microreactors failed to clear a House committee on Wednesday. Too many unanswered questions and insufficient public outreach to gain buy-in from Wyoming communities thwarted the effort to support Wyoming’s burgeoning microreactor manufacturing industry.

Senate File 186, “​​Advanced nuclear reactor manufacturers-fuel storage,” failed in the House Minerals, Business and Economic Development Committee with three votes for and five against. Committee member J.R. Riggins, a Casper Republican recovering from heart surgery, was excused. Barring an effort to resurrect the bill this session, committee members said they were eager to study the issue during the off-season between sessions known as the interim.

The bill was crafted in response to recent interest from a handful of companies to set up nuclear microreactor manufacturing in the state, including Radiant Industries, which is considering a location in Natrona County. Radiant, along with BWXT Advanced Technologies, want to build small, “modular” reactors that can be deployed across the nation and around the globe. Unlike BWXT, Radiant proposes to fuel its reactors at a manufacturing shop in the state, lease them to customers, and then eventually retrieve the reactors — along with the spent fuel — for redeployment. BWXT, which has a tentative agreement to deploy its technology at a Wyoming trona operation, would fuel its reactors at the site of operation, according to the company.

Radiant’s business model, the company says, only works if it is allowed to “temporarily” store the spent, radioactive nuclear fuel at the manufacturing site until it can be shipped to a permanent storage repository — which does not exist — somewhere in the U.S.

Rep. Lloyd Larsen, R-Lander, sits at his desk during the Wyoming Legislature’s 2025 general session. (Mike Vanata/WyoFile)

That, along with concerns about the safety of storing radioactive waste materials, earned a “no” vote from Gillette Republican Rep. Christopher Knapp.

“All I’ve received is [messages from] constituents that are very fearful,” Knapp said. “The reason they’re fearful is because the questions haven’t been answered. The questions haven’t been answered for 50 years.”

Proponents of the bill — including Ten Sleep Republican Sen. Ed Cooper, Lander Republican Sen. Lloyd Larsen and Radiant Director of Operations Matt Wilson — assured the committee that the U.S. Nuclear Regulatory Commission would be the primary authority over such a facility, including the waste storage component, and that the federal agency has deemed it to be safe, although such a facility does not yet exist in the United States.

The radioactive waste, Cooper testified, would amount to “a few pounds a year,” and it would be “stored just exactly like it is at every other nuclear facility in the United States. 

“There’s 70-some of these [legacy nuclear power plant waste storage] sites scattered around the country,” Cooper continued. “There’s almost [100,000 metric] tons of fuel being stored at those sites today, securely. It’s been stored there for 50-plus years. It’s safe, it’s clean and it’s a great opportunity for the state of Wyoming.”

Radiant Industries Director of Operations Matt Wilson testifies to a Wyoming legislative committee in February 2025. (Zoom screenshot)

Though the bill would restrict storage to only nuclear fuel materials related to a Wyoming manufacturer, the committee heard concerns from members of the public regarding the safety and security of the site and the transportation of radioactive waste.

“I think even some of the recent news headlines indicate that this [transportation] is a concern,” Lander-based Wyoming Outdoor Council Energy and Climate Policy Director John Burrows said. “Even driving down to Cheyenne last night, in a winter storm, you realize how precarious [travel] can be in Wyoming.

“We would encourage you all to consider those [questions] in an interim study,” Burrows added.

A few years ago, Wyoming lawmakers changed state statute to allow for nuclear fuel waste storage, so long as it is limited to waste tied to a nuclear power generation facility in the state — an accommodation to open the door to TerraPower’s Natrium nuclear power plant planned near Kemmerer. Senate File 186, according to proponents, represents a slight expansion of those laws.

Lawmakers took a bigger swing at opening Wyoming to spent-nuclear fuel storage earlier in the session. House Bill 16, ” Used nuclear fuel storage-amendments,” would have allowed for the “temporary” commercial storage of the waste from any nuclear power reactor in the United States. But the measure did not make it out of the House for further consideration in the Senate.

Radiant has a deal with the U.S. Idaho National Laboratory to test its design — a major step toward commercial deployment, Wilson said. He noted that the passage of SF 186 would enable the company to both raise capital and get a leg up on federal permitting — a years-long process — and that Wyoming is near the top of the company’s list of states to pursue its nuclear microreactor manufacturing endeavor.

“We’re planning on picking up our community engagement efforts [in Wyoming] and broadening the conversation so that folks understand what Radiant is trying to accomplish,” Wilson said.

Correction: This story was corrected to distinguish differing operational plans between BWXT Advanced Technologies and Radiant Industries. A quoted figure regarding the volume of spent nuclear fuel waste stored at U.S. nuclear power plants was clarified. —Ed

Dustin Bleizeffer covers energy and climate at WyoFile. He has worked as a coal miner, an oilfield mechanic, and for 26 years as a statewide reporter and editor primarily covering the energy industry in...

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  1. The fear over nuclear “waste” is a canard left over from the cold war and the war on terror. Our current conventional fleet can only fission 5-10% of the fuel in the assembly leaving the remaining 90-95% to be put into storage until it can be reprocessed. A permanent facility for storage wouldn’t or will not be necessary if the NRC would allow the development of Generation-four reactor types which can burn previously spent fuel assemblies to completion leaving only the lanthanides and a few actinides with short half lifes. This even smaller amount of “waste’ would contain Rare Earth Elements and would only need to be stored on the order of decades before being safe to handle without significant shielding.

    We are missing out on a great opportunity here in Wyoming to get in on the ground floor of an actual energy revolution rather than the phantasm promised by the “green revolution”. We need more energy not less.

  2. It simply amazes me, all those against oil, gas, and coal, are against nuclear too. I wonder where everyone is going to work?

  3. Did the proponents of this boondoggle idea offer any information on how and who would be responsible for protecting hundreds of mini nuclear reactors from potential attacks from domestic and or foreign terrorists?

    1. Amazing how the 9-11 hijackers didn’t target any nuclear reactors or lightly-used spent fuel casks.

  4. Clearly seems like proponents of storing nuclear waste still have the cart before the horse. Once the permanent storage facility is constructed, permitted and operational, come back and talk about temporary storage.

  5. Hmmmm….

    Bill Gates not involved, not enough pockets were lined for approval.

    It isnt too late to STOP the crime going down in Kemmerer.