{
  "slug": "natrium",
  "name": "Natrium",
  "company_id": "terrapower",
  "coolant": "Liquid sodium",
  "reactor_type": "fbr",
  "output_mwe": 345,
  "thermal_mw": null,
  "fuel_type": "Metallic uranium",
  "enrichment_class": "HALEU",
  "enrichment_pct": "Up to 19.75% U-235",
  "regulator": "US NRC",
  "application_type": "Construction permit (10 CFR Part 50)",
  "application_date": "2024-03",
  "review_phase": "Construction permit issued March 2026",
  "decision_expected": null,
  "credibility_tier": "permitted",
  "docket": "NRC Docket 50-7505, US SFR Owner LLC",
  "first_site_name": "Kemmerer, Wyoming",
  "first_site_country": "USA",
  "offtakers": "PacifiCorp",
  "model_match": null,
  "transportable": 0,
  "form_factor": null,
  "what_if": null,
  "notes": "The first commercial Generation IV reactor approved under the NRC's Part 50 framework, permitted in March 2026. Pairs a sodium fast reactor with molten salt heat storage so the plant can follow load without changing reactor power. Non-nuclear construction started in 2024 ahead of the permit. Its schedule has already slipped once over HALEU: the design assumed Russian supply.\n",
  "source_name": "US Department of Energy and TerraPower",
  "source_url": "https://www.energy.gov/ne/articles/nrc-issues-construction-permit-terrapowers-natrium-advanced-reactor",
  "url": "https://nuclearchain.net/smr/natrium/",
  "license": "CC BY 4.0",
  "attribution": "NuclearChain (nuclearchain.net)"
}