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Borax II. Experimental Breeder Reactor I. Zero Power Physics Reactor. These are some of the names of the 52 reactors built at Idaho National Lab a half century ago. Here’s the story of what’s coming next: Aalo’s Critical Test Reactor.

16,897 Aufrufe • vor 1 Monat •via X (Twitter)

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We’ve gone critical. At 12:20 am on July 4th, Aalo sustained a controlled fission chain reaction for the first time. We have officially surpassed the goal of President Trump’s Executive Order 14301, achieving 4 advanced nuclear reactor criticalities by America’s 250th birthday. This is a zero-power criticality to validate our supply chain, reactor physics and control systems for our 10 MWe full-powered reactor, the Aalo-X, targeting power operations next year. Everything was built at full scale: fuel, moderator, control systems, etc., so we understand system performance at its commercial scope. That also meant tackling four of the most difficult things in nuclear with this criticality milestone: ✅ Ground-up construction of our reactor facility ✅ Manufacturing the reactor in our factory and shipping them by road ✅ Assembling our own fuel assemblies using commercial UO2 ✅ Standing up training, safety, and operational programs to become our own nuclear operator I am proud to say we have accomplished all four goals, along with achieving criticality. The reactor building was constructed in 36 days and construction to criticality was achieved in under 8 months. That’s the fastest nuclear build in the last 80 years. A massive congratulations to the Aalo Atomics team and our partners. Many thanks to Idaho National Laboratory, the DOE-Idaho Operations Office, and the Office of Nuclear Energy for their immense support in enabling this milestone and dedicated to the American nuclear resurgence.

Yasir Arafat

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The Department of Energy has formally approved our Preliminary Documented Safety Analysis (PDSA) for the Mark-0 reactor—our first demonstration reactor, scheduled to go live before July 4, 2026. Mark-0 will validate fueling operations, reactor controls, and core physics. This demonstration is a critical step toward generating electricity from advanced microreactors. Mark-0 uses a full-scale core and the same facility and fuel that will support our next reactor test in 2027. The PDSA defines the preliminary safety basis for the reactor, facility, and planned operations, demonstrating that our approach meets DOE expectations at this stage. This approval validates our safety case and establishes a clear pathway to final acceptance as we prepare for fabrication, assembly, and installation. Mark-0 will be tested at Idaho National Laboratory in Building 793—now the Reactors and Critical Experiments facility—a site with deep nuclear history. Decades ago, this building housed ML-1, the Army’s first mobile nuclear reactor. Today, it supports the next generation of deployable nuclear power. We find the historical relevance fitting and inspiring, as Antares develops a similar-scale microreactor to meet Army operational and installation needs. Since 2024, we’ve worked to establish this facility as an enduring testbed, enabling rapid progress without the need for groundbreaking construction. We’re grateful for our partners at DOE and INL, and for leaders like Congressman Mike Simpson who continue to support the American nuclear renaissance.

Antares

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