Small Modular Reactors (SMRs)
Compare output, reactor type, fuel, programme status and deployment path for representative SMRs.
SMR is a scale and delivery family — not one reactor technology
The SMRs in this dataset span light-water PWRs, a boiling-water reactor and a high-temperature gas reactor. That means the label “SMR” alone does not tell you coolant, fuel, outlet temperature, refueling approach or intended industrial use.
The curated SMR set spans tens to hundreds of MWe per module or unit.
Light-water and high-temperature gas designs can sit in the same “SMR” category.
Design approval, regulatory assessment, project development and construction are different milestones.
Background: World Nuclear Association SMR Design Database. Reactor-specific claims below come from the source linked on each profile.
Compare the designs on the fields that actually differ.
This is a curated comparison, not a claim that the list is exhaustive.
| Design | MWe | Technology | Fuel | Heat | Transportable | Programme status |
|---|---|---|---|---|---|---|
| NuScale Power Module NuScale | 77 | Integral pressurized water reactor | Standard LWR fuel (<5% enrichment) | Yes | No | Regulatory / selection NRC-approved design |
| Xe-100 X-energy | 80 | High-temperature gas-cooled reactor | TRISO-X | Yes | No | Regulatory / selection Licensing / project development |
| BWRX-300 GE Vernova Hitachi | 300 | Boiling water reactor | GNF2 fuel | Yes | No | Under construction Under construction |
| Rolls-Royce SMR Rolls-Royce SMR | 470 | Pressurized water reactor | LWR fuel | Yes | No | Regulatory / selection Selected / regulatory assessment |
Source, status and project context for each design.
NuScale Power Module
Integral PWR module with natural-circulation features and U.S. NRC design approval.
NRC-approved designSMRXe-100
80 MWe high-temperature gas reactor designed for electricity and industrial-grade steam.
Licensing / project developmentSMRBWRX-300
300 MWe boiling-water SMR using passive safety systems and established BWR technology.
Under constructionSMRRolls-Royce SMR
470 MWe factory-oriented PWR design intended for repeatable fleet deployment.
Selected / regulatory assessmentData snapshot verified against primary or authoritative sources: 21 September 2026. Reactor programmes and deployment schedules can change.