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The Nuclear Renaissance - Radiant |  a16z American Dynamism Transcript, AI Summary & Key Points

a16z · Aug 05, 2026 · Science & Technology · 13:14 · EN

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AI Summary

Radiant argues that the United States must restore its ability to iterate on nuclear technology by mass-producing small, factory-built reactors that are easier to deploy than conventional nuclear plants. Its Kidos microreactor is designed to be transported by land, air, and sea, provide about 1 megawatt of power for 5 years, require no on-site refueling or waste handling, and support remote communities, data centers, national security operations, and other off-grid applications. Radiant plans to test a commercial prototype at Idaho National Laboratory in 2026 at temperatures above 700° C for 150 continuous hours, aiming to become the first company to turn on a new commercial microreactor.

Key Points

  • The United States lost its ability to iterate on nuclear power, and Radiant argues that customers need mass-produced small reactors.
  • The aging energy grid has caused about 45% of Americans to experience at least one outage in the last year.
  • Radiant's Kidos is a transportable-by-land, air, and sea microreactor designed to provide power for 5 years without refueling every 8 hours.
  • A Kidos unit is described as roughly the size of a diesel generator, with about 1 megawatt of power and the ability to be daisy-chained to power a small city or a very large data center.
  • Radiant plans to take its unit to an 80-foot-diameter dome at Idaho National Laboratory in 2026, operate above 700° C, and run continuously for 150 hours.
  • Factory-built nuclear power is intended to move cost and schedule uncertainty into a controlled manufacturing process rather than leaving it with the customer at the deployment site.
  • Radiant says its reactor can support rapidly deployed AI, drones, and other operations by bringing an off-grid power source in a box.
  • Radiant aims to demonstrate that commercial microreactors can be deployed quickly and eventually produced at a rate of one reactor per week.

Findings

Idaho National Laboratory built 52 nuclear reactors over a 21-year span, with the last completed in 1977. assertion — stated by a speaker describing the laboratory's reactor history surprising 01:27

The transcript contrasts this earlier period of reactor construction with the absence of subsequent advanced-reactor construction at the laboratory.

Source: Idaho National Laboratory

About 45% of Americans experienced at least one power outage in the last year. assertion — presented as a statistic without a named study or source surprising 02:25

The transcript presents outages as evidence that the aging grid can impose serious costs, particularly for businesses.

Radiant's Kidos microreactor is designed to operate for 5 years without being refueled every 8 hours like a diesel generator. assertion — product description by the company surprising 05:49

The reactor is described as a transportable power source that can be removed and returned to a factory for refueling.

Source: Radiant Kidos microreactor

The Kidos microreactor is described as roughly the same size as a diesel generator but capable of producing many times more power. assertion — product comparison by the company surprising 05:49

Multiple units can be daisy-chained; the transcript gives four units as an example for powering a small city.

Source: Radiant Kidos microreactor

Radiant's transportable microreactor is designed for transport by land, air, and sea. assertion — product description by the company surprising 05:34

The unit is intended to be delivered in a box, operate at a customer site, and then be returned to the factory for refueling and handling of nuclear-related components.

Source: Radiant Kidos microreactor

The reactor is described as providing 5 years of power in a package that can fit in a few parking spaces and be transported on the back of an 18-wheeler. assertion — product description by the company surprising 06:29

The transcript attributes this portability to making the reactor small enough—about 1 megawatt—to transport to and from a site.

Source: Radiant Kidos microreactor

Radiant's planned test system is designed to reach over 700°C and operate continuously for 150 hours. assertion — stated test plan surprising 08:23

The test is planned at an 80-foot-diameter dome at Idaho National Laboratory, with the stated goal of taking the system critical and conducting a full-power test.

Source: Idaho National Laboratory test dome

Radiant says it has been on target since 2020 to reach the Idaho National Laboratory test facility by 2026. assertion — company schedule statement 08:31

The planned test is presented as a prototype demonstration rather than an already completed operating result.

Source: Idaho National Laboratory test dome

The transcript states that no new commercial microreactor has ever been turned on and that Radiant intends to be the first. assertion — statement by a laboratory representative surprising 10:00

This is presented as a race among companies developing commercial microreactors, not as a completed demonstration.

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Transcript

Searchable transcript of The Nuclear Renaissance - Radiant |  a16z American Dynamism — a16z (13:14). Search for a phrase, then click its timestamp to jump straight to that moment in the video.

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00:03 [music] We must think far beyond of what that nuclear power can do in terms of peace. Here we have a new source of energy. A source of energy that is absolutely important to the future of the world. That is why as far as this particular matter is concerned in the terms of nuclear power, we must not be afraid. We must explore it. [music] The core thesis of Radiant is about prosperity for civilization, for every human, which means making power more affordable for more people.

00:41 It's really just about enabling humans to be even more human. Power is the source and it is civilization itself. The US lost its ability to iterate on nuclear power as a source of energy. That happened because we didn't listen to customers. And so we have to massproduce small reactors because that's what customers actually want. And when the US regains its ability to iterate on nuclear technology, the future of energy changes.

01:25 [music] >> There were actually 52 nuclear reactors built at Ido National Laboratory in 21 years span. The last of which [music] was 1977 and none since then. There are no advanced reactors. Everything was done in the 1950s [music] and60s. Nuclear really got sidelined by the environmental advocacy groups that pushed misinformation on the general public.

01:51 We just continue [music] to ratchet up regulations for a variety of reasons including some of the public perceptions around nuclear is my opinion that we regulated nuclear [music] out of business because we made it too expensive. >> The current state of the energy grid is not great and it doesn't say hey America's ready to build. We need energy for everything.

02:12 And the grid we're building on right now is mostly created in the 60s and 70s. Technology has changed a lot. Society [music] has changed a lot. And it's starting to show that what we're building on is aging. About 45% of Americans have experienced one outage in the last year. For a business, that can be catastrophic. It's a really important thing for folks to grasp that when you [music] turn the lights on, it's from the 60s.

02:40 We kind of run just at the median of the power we need. And on some days in many states, we actually dip below what we need from an energy [music] perspective to really innovate. To unlock prosperity, we have to get above the line of what we need. We have to give ourselves room to do all of those. And that from a national security perspective is what will allow the US to be the US we all grew up dreaming about.

03:08 [music] >> Countries that rely on other nations for their energy have strings attached. When [music] there is conflict and energy sources are relied upon from other nations that have become adversaries, it can cause an entire country to shut down. To be able to have your own energy independence provides energy security as [music] well. And that is exactly what nuclear power can provide.

03:49 I founded Radiant after working at SpaceX for about 12 years. One of the things I worked on was this Mars [music] challenge, which is to make life multilanetary. In order to really make that happen, you need to be able to take Starship to Mars and then make fuel on Mars and bring it back. And to do that, you need power. And so I looked into solar power on Mars and found that was really challenging.

04:09 And then I looked into nuclear power on Mars and found that was the only way. I didn't want to found a company. I had to do it because I knew that the mission that SpaceX itself had could not be achieved unless we had nuclear and I wasn't able to work on it. So it forced me to found a company. Doug builds in machines and systems and I build in people and companies.

04:27 The more we got into it, we kind of discovered together the impact that we could have. >> [music] >> What we want to be doing is building reactors, not reactor buildings. >> You got to dig a massive hole in the ground. And once you start digging a hole in the ground in the US, you have no idea how long or how expensive that [music] project will be. Costs are very hard to control.

05:02 Once you make a nuclear reactor and a ground at a site, [music] that site is a radiological site for forever. Puspers are not super excited about that. [music] When Doug was designing the product, he said, "Well, all of these things must be [music] true, and therefore I have to make a product that is above ground, that is movable to where customers need it, and then also that they don't have to deal with waste on site."

05:32 And so, you got Kidos. It's a transportable by land, air, and sea micro reactor. After a customer has used it, we take it back to our factory site in Oakidge, Tennessee, and refuel it. We handle all of the parts of the nuclear industry that customers didn't want. >> I always tell people when I talk about the kidos reactor to think of a diesel generator.

05:52 Anywhere you'd see a diesel generator, you could bring in a kidos reactor. They're roughly the same size except you don't have to refill it every 8 hours. [music] It gives you power for 5 years and it provides much more power, many, many times more power than a diesel generator. And you can daisy chain them together. So you can bring in four kitus reactors and power a small city.

06:12 [music] You could power a very large data center. You have all kinds of capabilities that come around [music] from something that really can be put on the back of an 18-wheeler. That kind of power generation and making it transportable [music] has never existed before. That's why I say there's actually use cases that we haven't really even imagined yet.

06:27 One [music] of our units is 5 years of power in a box that just gets delivered, fits in a few parking spaces, and then whenever you want us to take it away, [music] we take it away, which hasn't really done before. It's only possible if you make a size about 1 megawatt, right? make a small [music] enough reactor, you can do this, transport it there and back again sort of trick and take the fuel back and so you have like no nuclear strings attached, you can [music] just have clean power.

06:51 So for national security, we also don't know where we might need power sources to be set up. So if you need to rapidly deploy AI, you need to rapidly deploy drones, you need to rapidly put something somewhere, it needs to come with power. And if you're not on a grid, you need to bring the grid with you in a box. [music] When you're building a commercial product, you have to have the same desire [music] to lower customer friction as Apple did with the iPhone.

07:16 With nuclear reactors, that might sound wild, but it's an absolute necessity. We have to control all of our costs [music] inside our factory, and we can't put any of that burden onto our customer. We can't put any of the burden of the construction on site, [music] the interconnect onto them. We really need to make it as simple as make a reactor. It shows up, it plugs in, you get power.

07:40 [music and snorts] >> If you can change that dynamic to factory build, you take those uncertainties off the table. You might translate a little or some part of those uncertainties to building your factory and your entire process, [music] but once you've done that, you're done. If you're successful, then you can just start turning out that commodity.

08:00 [snorts] And your customer then has a much much lower potentially even almost zero uncertainty in their cost in their on-site activities or just completely produced. That is a tremendous promise of factorybuilt nuclear. We're taking this unit to the dome which [music] is this 80 foot diameter structure that was built in the 50s. It actually had the experimental breeder reactor in it at Idaho National Laboratory.

08:31 Since 2020, we've been on target for going there by 2026 [music] and then we'll go critical. The system is designed to go to over 700° C [music] and then we'll run for 150 hours continuously. >> That dome was going to be torn down and ultimately was repurposed for this purpose that now enables Radiant to be the first company that comes in [music] that was selected through a competitive process.

08:55 Radiant was selected. Simplistically speaking, the maturity of their technology, the maturity of their planning, [music] the benefits of that test are going to be in terms of a full power test over a significant period of time, which will be our first full power test [music] at the laboratory in a very, very long time. When Radiant first started talking to ENL about testing in the dome, we were I think somewhere around 20 employees and we said four years from now, we're going to build a commercial prototype of our

09:28 reactor and we're going to test [music] it in that facility. And they said, well, we're going to have to build out that facility, too, and you're 20 people. And so there's a lot of faith and trust [music] and process that we put in the way as we were developing both the product itself as well as the full test campaign, the test facility. And really through all of that is where we developed [music] the partnership.

09:50 >> The executive orders that our president signed May [music] of last year accelerated everything. And so that is a critical component that has helped make this possible. As a number of companies [music] race, nobody has turned on a new commercial micro reactor ever before. And Radiant's going to be the first to do that. [music] [music] We don't design, build, and execute on safe reactors.

10:35 >> [music] >> No one's going to buy them. We are a company that needs to make money. We are in the United States. Making money is pretty important to sustain to build out the full mission. If we were a cavalier and how we built even the prototype, we put the future at risk and our customers at risk in a way that is almost completely perverse to what the mission's goal is.

10:54 [music] >> What's happening in nuclear right now is unbelievable for somebody like me who has spent my entire career in nuclear. I believe we're in a full-on renaissance. >> The world is watching, but the world is waiting. And there are many companies that want to deploy, but they just don't want to be first. And Radiant is willing to be first [music] and has the courage to take those calculated risks and then demonstrate to the world, not only the public, that's an important [music] point, that you demonstrate to the

11:27 public, that this can be done and it can be done quickly. I love the idea of one nuclear [music] reactor per week just coming off of a production line. We'll be able to just plug in a nuclear power module to any of their designs and then [music] proliferate our use of power in space. Maybe make a city on the bottom of the ocean. [music] Maybe put a reactor at that high up camp on Mount Everest.

11:46 Just put [music] power in places that today seem totally crazy and impossible. >> Nothing we're trying [music] to do at Radiant is considered reasonable. We're an energy company at our core. We want to change society's relationship to energy. [music] You don't do that by doing a slightly different version of something that's always been done. You have to come out with a kind of ridiculous stance and really drive in that direction to accomplish it.

12:13 [music] >> Nuclear micro reactors that are mass-produced, that are reliable in the most wild scenario enables humans to leave the star that we were born [music] at, the sun, and go to other ones. And it's imperative that we do it as a civilization. [music] [music]