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Aalo Atomics: Commercializing MARVEL in the Advanced Reactor Race

Aalo Atomics: Commercializing MARVEL in the Advanced Reactor Race

/ Atomic Art / By

Author: The Kernel and Kiersten Sundell

Advanced reactor developers are facing a regulatory paradox: the Nuclear Regulatory Commission (NRC) won’t license new designs without operational data, but obtaining that data requires building a reactor, which requires a license. While many companies are stuck in this catch-22, Austin-based Aalo Atomics, a startup founded in 2022, found a way around it.

MARVEL (Microreactor Applications Research Validation and EvaLuation) is a 100-kilowatt research microreactor at Idaho National Laboratory that kicked off operations in 2020. The federal program was designed to test sodium-cooled fast reactor technology and generate operational data that could inform future commercial development.

MARVEL’s project lead, Yasir Arafat, left INL in 2023 to co-found Aalo Atomics – a commercial-scale version of the MARVEL reactor that Arafat helped design. The Aalo Pod is a 50-megawatt sodium-cooled reactor consisting of five clustered 10-megawatt Aalo-1 reactors, amounting to 100 times more power than its parent design. Their target market is artificial intelligence data centers, which face explosive power demands and are willing to pay premium prices for reliable, carbon-free electricity.

In the Aalo pod, liquid sodium metal flows through the reactor core, absorbing heat from nuclear fuel. Sodium is a highly efficient heat conductor that operates at low pressure, posing a strategic advantage over traditional water or gas coolants. This eliminates the thick pressure vessels required by water-cooled designs, but brings along a host of other operational challenges, including the fact that it burns on contact with air and explodes on contact with water. Russia has struggled through sodium fire incidents for decades between its BN-600 and BN-800 commercial reactor models, providing the rest of the world with a detailed roadmap of what not to do when your coolant is chemically incompatible with both air and water.

The Regulatory Strategy

The company is constructing Aalo-X, their experimental reactor, directly adjacent to MARVEL at Idaho National Laboratory. Research reactors don’t require the same NRC licensing process as commercial reactors, as they receive rigorous government supervision during operation. By comparing data between the government’s research reactor and their scaled-up version, they can demonstrate to the NRC that their methodology for increasing reactor size is technologically viable. In this arrangement, the government gets valuable research data, and Aalo gets the operational results they need for licensing approval. It’s a clever strategy, but also means a lengthy period until commercialization comes around.

Aalo’s approach has attracted serious backing. The Department of Energy selected them for the Nuclear Reactor Pilot Program, which challenges participating companies to achieve criticality by July 4, 2026. They’ve secured $100 million in Series B funding, and have signed agreements with URENCO that makes them the first advanced reactor developer to receive fuel delivery in 2026. Fuel commitment matters significantly, as it’s a typical bottleneck for advanced reactors using non-standard enrichments. This arrangement gives them a slight advantage.

The Assessment

The real question is: Will Aalo be first to commercial operation, per their claims? Likely no, but they aren’t in bad shape either. They have a clear technical strategy, federal support, substantial funding, and secured fuel supply. They’re building actual hardware at Idaho National Laboratory, not just presenting slides. And they’re not alone in struggling toward aggressive deadlines, as almost every participant in the Nuclear Reactor Pilot Program will likely miss the July 2026 target.

Building on MARVEL’s foundation instead of starting from square one gives Aalo better odds than most competitors attempting similar timelines, and it’s likely that their plans will eventually see success.

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