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2h ago

Three Advanced Microreactors Reach Initial Criticality, Meeting July 4 Target

Federal demonstrations have validated reactor physics under DOE pilot programs, with licensing and fuel‑supply scaling needed before reactors can produce commercial electricity.

Unity demonstration reactor test article at Idaho National Laboratory. Deployable Energy’s zero-power critical experiment uses 4.95% enriched LEU UO₂ fuel, light-water moderation, and helium cooling to validate the physics basis for its 1-MWe-class Unity microreactor platform. Source: POWER.
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Overview

  • Deployable Energy’s Unity, which achieved initial criticality on Wednesday, became the third test reactor to hit the administration’s July 4 goal and the first criticality under the DOE’s Nuclear Energy Launch Pad program.
  • Antares Nuclear and Valar Atomics reached earlier criticality milestones in June, and Aalo Atomics plans an NRC commercialization application later in 2026 for its Aalo‑X design.
  • Initial criticality proves a stable, self‑sustaining chain reaction and validates core reactor physics but does not mean the reactors are producing electricity; teams will now run phased power‑ascension tests to confirm full performance and safety.
  • Commercial operation depends on separate Nuclear Regulatory Commission licensing and a large increase in high‑assay low‑enriched uranium (HALEU) and TRISO fuel production, which industry and DOE identify as the main near‑term bottlenecks.
  • Developers plan first electricity demonstrations in 2027–2028 and commercial deployments in 2028–2029 for niche uses like remote power, defense and data centers, and the DOE demonstrations are intended to generate data to accelerate NRC review.