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Nuclear Microreactors Advance as US Picks Two Companies for Fueled Testing (postregister.com) 188

This week America's Energy Department selected two companies to perform the first nuclear microreactor tests in a new facility in Idaho, saying the tests "will fast-track the deployment of American microreactor technologies... The first fueled reactor experiment will start as early as spring 2026."

The new facility is named DOME (an acronym for Demonstration of Microreactor Experiments), and it leverages existing "to safely house and test fueled reactor experiments, capable of producing up to 20 megawatts of thermal energy," according to a local newspaper. [T]wo companies were competitively selected in 2023 and are currently working through a multi-phase Energy Department authorization process to support the design, fabrication, construction, and testing of each fueled reactor experiment. Both are expected to meet certain milestones throughout the process to maintain their allotted time in DOME and to ensure efficient use of the test bed, according to the release... The department estimates each DOME reactor experiment will operate up to six months, with the DOME test bed currently under construction and on track to receive its first experiment in early 2026... The next call for applications is anticipated to be in 2026.
The site Interesting Engineering calls the lab "a high-stakes proving ground to accelerate the commercialization of advanced microreactors..." Based in Etna, Pennsylvania, Westinghouse will test its eVinci Nuclear Test Reactor, a compact, transportable microreactor that uses advanced heat pipe technology for passive cooling. Designed to deliver 5 megawatts of electricity on sites as small as two acres, eVinci could support applications ranging from remote communities to mining operations and data centers. Meanwhile, Radiant (El Segundo, California) will test its Kaleidos Development Unit, a 1.2 megawatt electric high-temperature gas reactor aimed at replacing diesel generators. Designed to run for five years, Kaleidos is fueled by TRISO fuel particles that could offer reliable backup power for hospitals, military bases, and other critical infrastructure.
Radiant's CEO said "In short order, we will fuel, go critical, and operate, leading to the mass production of portable reactors which will jumpstart American nuclear energy dominance."

Nuclear Microreactors Advance as US Picks Two Companies for Fueled Testing

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  • Note also the construction of a molten salt research reactor on the campus of Abilene Christian University in Texas. The reactor happens to sit on the playground of the elementary school I attended, which the university acquired a few years ago (the school is in a new facility at a different location). https://acu.edu/research/next-... [acu.edu]
  • Is that no state wants to take the waste. I think if Scientists had a say, the waste would be stored deep under a Mountain in Colorado, or burned up in other reactors. As it is, the waste seems to just sit next to the nuclear site where it is. It is NIMBY on steroids. Just brainstorming, but I think it could be safely flushed into an old, used up oil well.
    • by aaarrrgggh ( 9205 ) on Saturday July 05, 2025 @11:42AM (#65499218)

      If scientists had a preference we would be using breeder reactors that reduce waste and promote recycling.

      • Frustrating is it not? Scientists are demonized these days, and replaced with a bunch of buzzwords.
      • Depends on whether the "scientist" works for the nuclear industry. I suspect if you asked most scientists around the world they would want more solar and wind and for us to get on with developing storage for it to be used when needed.
        • How is solar the answer to the question of *where* to put nuclear waste? We're not going to launch it into the sun. At least follow the conversation. The question was not "what power source do scientists prefer".

          • How is solar the answer to the question of *where* to put nuclear waste? We're not going to launch it into the sun. At least follow the conversation. The question was not "what power source do scientists prefer".

            The the post I responded to said:

            My only gripe with nuclear ... is that no state wants to take the waste.

            If you don't have any waste you don't have to put it anywhere. Nor do you have to transport it somewhere thousands of miles away through crowded communities. This isn't a "science" problem. They can't make nuclear waste safe.

            We're not going to launch it into the sun.

            As I recall, that has been proposed. Don't let Elon Musk hear it, he'll be all over it. There is money to be made. He'll get the process down after a few tries ...

    • We tried under a mountain in Nevada [wikipedia.org] but spot on, it was NIMBY'd, in this case primarily by Harry Reid, senator from Nevada.

      Until there's political will from Congress to do something else of similar scale, some combination of transport, storage and reprocessing it's gonna be on site cooling pool status quo. It doesn't get solved without a shitload of Federal money.

      • The good old days of Harry Reid, that is a blast from the past when Republicans did make sense, and had a case. It seems that they simply lie now. George Will was one of my favorite Republicans. I spent many, many hours trying with thought experiments to dispute his views. Now I simply go: Stupid MAGAs. Stupid, Stupid Stupid. I guess George Will does too. Funny how things change.
        • Yeah I don't agree with him on this issue but I liked Harry Reid, he was a way better majority leader than Schumer imo. Interesting how many of the neocons smelled Trump and did not want to acquiesce.

          I appreciate Bill Kristol practically becoming the vanguard and calling for the abolition of the DHS [mediaite.com]

          • I listened a lot to Bill Kristol myself. Decent guy. We can agree to disagree, however, with MAGA lying I simply can not go there. It is too much. No, not ever.
      • It doesn't get solved without a shitload of Federal money.

        Based on the track record, it doesn't get "solved" at all. The nuclear industry is counting on the taxpayers to pick up the tab for cleaning up the temporary storage mess they are leaving next to all their plants. But it will likely take a major Chernobyl scale disaster at a temporary storage facility for anything to happen.

        • Well I say Federal dollars mainly because I don't believe the "industry" is capable of doing it on it's own really nor should it be at least without a level of oversight that makes the public/private distinction effectively meaningless.

          I don't want the taxpayers to bail them out I want the public to own the system and the process both as a piece of public infrastructure and as a matter of economic and national security.

          It's a problem that will have to get solved and businesses can just go out of business an

          • why don't we just accept and own it.

            Because there is money to be made in the meantime. I think you minimize the extent to which the finance industry dominates government policy. They are really the "we" in why don't "we" own it. Its not clear private industry's control over things changes with government ownership, just the method of control. So the question is whether forcing them to use political processes will get better results or worse. Having taxpayers directly on the hook may make things worse.

            • Government does not need financing, it can finance itself, that's why it can and is supposed to handle huge externalities like say, nuclear waste disposal, either through corrective actions on industry or direct action.

              With something like nuclear waste and the timescales we are dealing with the taxpayer is on the hook either way, just a matter of when so again why not own it as in nationalize it similar to how France does it.

              • Government does not need financing, it can finance itself, that's why it can and is supposed to handle huge externalities like say, nuclear waste disposal

                In the United States the federal government is responsible for permanent disposal of nuclear waste. You have seen how that has worked.

      • It is not surprising America can't manage this, but nobody looks to you for inspiration anymore anyway.

        https://www.nucnet.org/news/fi... [nucnet.org]

        https://www.world-nuclear-news... [world-nuclear-news.org]
  • by Cyberpunk Reality ( 4231325 ) on Saturday July 05, 2025 @11:11AM (#65499132)
    From Admiral Rickover's 1953 'Paper Reactor' memo [whatisnuclear.com], "An academic reactor or reactor plant almost always has the following basic characteristics: 1. It is simple. 2 It is cheap. 3.It is light. 4. It can be built very quickly. 5. It is very flexible in purpose (“omnibus reactor”). 6. Very little development is required. It will use mostly “off-the-shelf” components. 7. The reactor is in the study phase. It is not being built now." Time will, of course, prove the final test as to whether these "microreactor experiments" to produce a "compact, transportable microreactor" will successfully " fast-track the path from lab bench to commercial rollout" and eventually " support applications ranging from remote communities to mining operations and data centers" and "replace disel generators". But I wouldn't bet on it.
    • Even more prescient there is the next passage

      On the other hand, a practical reactor plant can be distinguished by the following characteristics:

      It is being built now.
      It is behind schedule.
      It is requiring an immense amount of development on apparently trivial items. Corrosion, in particular, is a problem.
      It is very expensive.
      It takes a long time to build because of the engineering development problems.
      It is large.
      It is heavy.
      It is complicated.

      Which back in 1953 correctly describes the difficulties with react

    • by AmiMoJo ( 196126 )

      I looked at the eVinci website and it's hilarious. It tries so hard to avoid mentioning the major downsides, and even has a mock-up of it being transported on a trailer. The actual text notes that it needs a shipping container, presumably a very special one that it able to withstand the most severe road accident imaginable without leaking nuclear fuel all over the road.

      It produces 5MWe, and 15MWth. That means it's pumping out a LOT of heat. Despite them claiming that it can work in any environment without c

  • by gweihir ( 88907 ) on Saturday July 05, 2025 @11:18AM (#65499152)

    And likely even later. Nuclear is always massively delayed and massively over price.

    • I hope not, it seems almost "magical" to me that we can collect and refine atoms that give off heat. It seems like it should be cheap, and almost free. That was the dream back in the 1950's, "they" even speculated that it should be so cheap that we wouldn't even have to monitor electricity usage. Something went off the rails here, and I suspect that the Big Oil Companies have something to do with this.
      • by ceoyoyo ( 59147 )

        "They" was Lewis Strauss, the chairman of the US Atomic Energy Commission in a speech. Here's the full quote:

        It is not too much to expect that our children will enjoy in their homes electrical energy too cheap to meter, will know of great periodic regional famines in the world only as matters of history, will travel effortlessly over the seas and under them and through the air with a minimum of danger and at great speeds, and will experience a lifespan far longer than ours, as disease yields and man comes t

        • There is much of what you said that needs "digesting", first up is that yes, life spans back in the 1800's was I think, about 35 years old. Wow, and most of us are now living into our 70's or 80's. And yes, air travel is amazing, and amazingly safe. I kind of get pissed off when ever an air accident is reported in the news. I guess it is a Rich person thing. Death from Airplanes is a tiny blip in the scheme of things, in my humble opinion, and should not be in the news. If people are concerned abo
    • and massively over price.

      Don't worry this will solve this by making the most expensive form of power we have even more expensive.

  • by burtosis ( 1124179 ) on Saturday July 05, 2025 @11:25AM (#65499176)
    The problem with miniature reactors is the cost of operation. Basically the amount of material that becomes contaminated and needs to be replaced and or disposed of is vastly higher on a lifetime $/kwh basis. It’s like running ten thousand one horsepower motors instead of one ten thousand horsepower motor. You are going to have incessant and massive component supply and disposal demand costs compared to the single reactor. Further, the mess from ten thousand units makes for rampant pollution whereas it’s easier to pin down and hold to account a single reactor. If you have a base in the Antarctic, or a satellite, these may be an option if the total supply is highly limited. But the ease and cost of a simple generator is going to price everyone out of miniature reactors except all but the least serviceable and hospitable applications.
    • Nitpicking with your analogy, it is exactly like running a 10,000HP motor with a system of belts and pulleys because ultimately the application needs to power 10,000 small 1hp devices. It works, but it pushes cost from one place to the next.

      • by evanh ( 627108 )

        It more than moves costs around, it adds a shit ton extra costs that no one will be interested in. And then it also throws out a shit ton of uncontrolled radio active waste that no one wants to deal with.

  • Maybe check back later?

  • This answers the question of whether nuclear power is commercially viable. Its not. Without government subsidies it will never get off the ground and those subsidies will continue for as long as it exists. But there is money to be made so their are investment opportunities. So we will delay any immediate real efforts to replace fossil fuels while chasing after the phony promises of the nuclear industry of unlimited clean energy sometime in the future..
    • It does seem to me that solar and wind is the cheapest energy solution, but somehow, because of politics... it is denied. For example, look at Texas. Solar and wind.. and batteries are supreme, however we export our oil and nat gas to other states and Countries. I have to think, as a Texan, wow, you people are suckers.
      • Grid-scale batteries are getting better but not quite there yet. Once one of the upcoming grid-storage battery techs makes it to maturity, solar will quickly beat almost every other energy tech, in almost every application. Costs to generate energy by hydrocarbon, nuclear, and wind methods have a cost floor below which they aren’t likely to fall, whereas solar is basically silicon, aluminum, glass and a bit of plastic, extremely cheap to install, and requires almost no maintenance.

        In the long run,
  • And it's not even Halloween yet...

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