Regulatory Intelligence
HOW REACTORS GET BUILT
Building an advanced nuclear reactor in the United States requires navigating three independent qualification systems simultaneously: NRC licensing (safety case), DOE funding (capital), and fuel qualification (operations). This page tracks where each pathway stands and where each developer sits within them.
Section 1 — NRC Licensing
NRC LICENSING PATHWAYS
Two regulatory frameworks govern commercial nuclear licensing in the US. Part 52 (1989) was designed for light water reactors and uses design certifications and combined licenses. Part 53 (2025) is a new technology-inclusive framework for advanced non-LWR designs.
10 CFR PART 52
Light Water Reactors
10 CFR PART 53
Advanced Non-LWR — New 2025
PART 50 NOTE
TerraPower — Natrium is licensed under the older 10 CFR Part 50 Construction Permit (CP) pathway rather than Part 52 or 53. Part 50 separates the construction permit and operating license into two distinct applications. TerraPower chose this path because Natrium's SFR technology was not covered by Part 52 design certification rules at the time of application, and Part 53 had not yet been finalized.
SOURCE: NRC — 10 CFR Parts 50, 52, and 53 (effective July 15, 2025) · NRC ACRS reports · NuScale SER (ML23107A156) · Kairos CP decision (ML23348A003)
Section 2 — DOE Funding
DOE FUNDING PATHWAYS
Three parallel federal funding mechanisms de-risk advanced nuclear development. ARDP provides cost-shared construction grants, LPO provides low-cost debt, and the HALEU program develops the fuel supply chain that most advanced designs require.
SOURCE: DOE-NE — ARDP Award Agreements 2020–2023 · DOE LPO Conditional Commitments · DOE HALEU Availability Program FOA · IRA §40323 · Congressional Budget Office cost estimates
Section 3 — Fuel Qualification
FUEL QUALIFICATION PIPELINE
Nuclear fuel must complete a multi-stage qualification process before it can be licensed for commercial use. Each fuel type follows a distinct path through design, irradiation testing, post-irradiation examination, and NRC approval.
STAGE 1
Fuel Design
& Specification
COMPLETE
▶
STAGE 2
Fabrication
Development
COMPLETE
▶
STAGE 3
Irradiation
Testing
COMPLETE
▶
STAGE 4
Post-Irradiation
Examination
COMPLETE
▶
STAGE 5
NRC Fuel
Approval
COMPLETE
▶
STAGE 6
Lead Test
Assemblies
ACTIVE
UO₂ Pellet (LWR)
Established qualification path. Multiple approved vendors (Westinghouse, Framatome, GNF). Accident-Tolerant Fuel (ATF) variants (chromia-doped, FeCrAl, SiC cladding) in lead test assembly phase at multiple plants.
NOTE: ATF chromia-doped pellets: full NRC approval expected 2026–2027.
MOX STATUS — TERMINATED
MOX (Mixed Oxide) fuel program at Savannah River Site (SRS) was terminated in 2018 after $17B spent. Pivoted to "dilute-and-dispose" strategy for surplus weapons plutonium. No active commercial MOX qualification path in the US.
SOURCE: DOE-NE — AGR Fuel Development & Qualification Program (INL/EXT-22-69686) · NRC Fuel Qualification Branch · NuFuel Technology Roadmap · IAEA TECDOC-1900
Section 4 — Company Positions
COMPANY POSITION MATRIX
Where each advanced reactor developer stands across the NRC licensing, DOE funding, and fuel qualification dimensions. Click a row to expand notes.
| COMPANY / REACTOR | NRC STAGE | PART | DOE FUNDING | FUEL STATUS | SIGNAL |
|---|---|---|---|---|---|
TerraPower Natrium (SFR) | Construction Permit | Part 50 CP | ARDP $2B + LPO pending | U-Zr metallic — in qual | ADVANCING |
NuScale Power VOYGR (iPWR) | DC Approved (2023) | Part 52 DC | ARDP risk-reduction (prior) | UO₂ — NRC approved | AT RISK |
Kairos Power KP-FHR (TRISO/FLiBe) | Construction Permit | Part 50/53 | ARDP risk-reduction $303M | TRISO — qualification ongoing | ADVANCING |
X-energy Xe-100 (HTGR) | Standard Design Approval | Part 52 SDA | ARDP $1.2B | TRISO-X — fabrication dev | ON TRACK |
Oklo Aurora Powerhouse (SFR) | Pre-Application (Part 53) | Part 53 | ARDP risk-reduction (prior) | U-Mo metallic — early stage | DELAYED |
GE Vernova Hitachi BWRX-300 (BWR SMR) | Pre-Application / SDA filing | Part 52 DC/SDA | No ARDP (LWR tech) | UO₂ — NRC approved | ON TRACK |
ADVANCING
ON TRACK
DELAYED
AT RISK
SOURCE: NRC Docket Search · DOE-NE ARDP Quarterly Reports · Company 10-K filings and investor presentations · WNN / NEI news coverage through Q1 2026