Will any advanced reactor design achieve first criticality in a test or demonstration reactor in the United States by December 31, 2026?
Why This Question Matters
Physical construction progress is the leading competitive indicator. First criticality of any advanced reactor would be a watershed milestone validating the nuclear renaissance beyond asset repricing. It would sharpen the public-private competitive dynamics — the meta-synthesis assigns 70% probability a competitor builds before NNE. Maximum uncertainty (no precedent to calibrate from) gives this market the highest raw information gain.
Resolution Criteria
Resolves YES if any advanced reactor design (including but not limited to Kairos Hermes, TerraPower Natrium, X-energy Xe-100, or any DOE Reactor Pilot Program reactor) achieves initial criticality in a test, demonstration, or pilot reactor on U.S. soil by December 31, 2026. Initial criticality means a sustained, controlled nuclear chain reaction confirmed by NRC or DOE. Resolves NO if no advanced reactor achieves first criticality in the U.S. by December 31, 2026.
Resolution Source
NRC event reports, DOE press releases, company announcements, NRC inspection reports
Source Trigger
DOE Reactor Pilot Program — first test reactor criticality target July 2026. Private competitors (Kairos Hermes under construction, TerraPower Natrium under construction) are 2-3 years ahead of all public reactor tech companies on physical construction milestone.
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