Small, transportable nuclear reactors – designs that ship in a container or barge, site in a variety of locations, and can be factory-built – compared across fuel, cooling, output, cost, and regulatory status. This table accompanies Small Transportable Nuclear Reactors.
| Reactor | Company | Country | Fuel Type | Cooling Type | Mil. | Civ. | Regulatory Status | Refuel (yr) | Power (MWe) | Life (yr) | Total Cost (USD) | Cost/MW (USD/MWe) | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| XENITH | X-energy | USA | TRISO (HALEU)* | Helium gas* | Yes* | Yes* | NRC pre-application (USA) | 20 | 3-10 | 20* | $60M-$200M* | $20M-$30M/MWe* | Specs cited previously (20-year core, 3-10 MWe). Fuel/cooling based on HTGR class; costs derived from microreactor cost ranges and scaling to output. |
| Kaleidos | Radiant* | USA* | TRISO (HALEU)* | Gas-cooled with heat exchangers* | Yes* | Yes* | Planned DOME testing (INL) ~2026* | 8-10* | 1.2* | 10-20* | $20M-$40M* | $17M-$33M/MWe* | [Unverified] Based on public mentions of DOME and typical portable microreactor sizing; costs benchmarked to similar microreactor estimates. |
| eVinci | Westinghouse | USA/Canada* | HALEU (solid core, TRISO-like)* | Heat pipes to Brayton cycle* | Yes* | Yes* | Pre-licensing; DOME demo targeted ~2026* | 8-10* | 5 | 10-20* | $60M-$100M* | $12M-$20M/MWe* | [Unverified] Power rating widely cited (~5 MWe). Fuel/cooling simplified; costs from Westinghouse statements and peer microreactor ranges. |
| Aurora | Oklo | USA | HALEU metallic (fast spectrum)* | Heat pipes/sCO2* | Yes* | Yes* | U.S. licensing re-initiated; site-specific efforts ongoing* | 10-20* | 1.5-15* | 20* | $40M-$150M* | $10M-$27M/MWe* | [Unverified] Early materials referenced 1.5 MWe; later variants larger. Costs extrapolated from microreactor ranges with fast-spectrum premium. |
| MMR (Micro Modular Reactor) | Ultra Safe Nuclear (USNC) / Global First Power | USA/Canada | TRISO (FCM) | Helium gas | No* | Yes | CNSC licensing with GFP at Chalk River; project timelines under review* | 20* | 5* (15 MWth) | 20* | $100M-$200M* | $20M-$40M/MWe* | [Unverified] Ratings commonly described as 15 MWth/5 MWe. Costs inferred from first-of-a-kind (FOAK) demo at Chalk River scale. |
| SEALER-Arctic | LeadCold / Swedish Advanced Lead Reactor | Sweden/Canada | LEU/HALEU (fast)* | Lead-cooled fast reactor | No* | Yes | Engagement with CNSC in Canada* | 10-30 | 3-10* | 30* | $80M-$150M* | $10M-$27M/MWe* | [Unverified] Long-life core claims; power band inferred from public concept studies; costs from lead-cooled microreactor benchmarks. |
| RITM-200N (land-based) | OKBM Afrikantov / Rosatom | Russia | LEU (oxide) | PWR (light water) | No* | Yes | Under development; target commissioning ~2028* | 5-7* | 55* | 40* | $300M-$600M* | $5.5M-$11M/MWe* | [Unverified] Based on marine RITM-200 ratings (~55 MWe each) adapted to land variant; costs scaled from small PWRs in remote regions. |
| U-Battery | U-Battery (Urenco-led consortium) | UK/NL | TRISO | Helium HTGR | No* | Yes | Program paused/cancelled (~2022-2023)* | 5-10* | 4 | 20-30* | $50M-$120M* | $12.5M-$30M/MWe* | [Unverified] Power rating per public concept; status noted by industry reports; costs benchmarked to HTGR microreactor class. |
| KLT-40S (Akademik Lomonosov) | OKBM Afrikantov / Rosatom | Russia | LEU | PWR (light water, marine) | No | Yes | In operation (Pevek, Russia) | 3-4* | 2 x ~35 (barge total ~70 MWe)* | 35-40* | $600M-$740M (barge)* | $8.5M-$10.5M/MWe* | [Unverified] Uses two KLT40S units; costs from reported project totals divided by electric output. |
| RITM-200 (Project 22220 icebreakers) | OKBM Afrikantov / Rosatom | Russia | LEU | PWR (marine) | No* | Yes | In operation (marine fleet) | 5-7* | ~55 each* | 30-40* | N/A | N/A | [Unverified] Included as LWR lineage for transportable/derivative land systems. Costs not itemized per reactor. |
| Offshore Floating Nuclear Plant (OFNP) - New Jersey concept | Offshore Power Systems (Westinghouse/Tenneco) | USA | LEU (PWR)* | Seawater-cooled PWR* | No | Yes | Cancelled (1970s) | 18-24 months* | ~1150 per unit* | 40* | $3B-$5B (1970s $)* | $2.6M-$4.3M/MWe (1970s $)* | [Unverified] Historical project off NJ; figures converted conceptually from large PWR norms of the era; not directly comparable to microreactors. |
| Seaborg CMSR Power Barge | Seaborg Technologies | Denmark | Low-enriched UF4 in molten salt* | Molten salt (primary) with water/steam secondary* | No* | Yes | Development; aiming for first power barge late 2020s* | 12-24 months fuel salt processing* | 100-200 per barge* | 24-30* | $400M-$800M* | $2M-$4M/MWe* | [Unverified] Based on company decks and SMR barge analogs; costs scale with unit count per barge. |
| RITM-200N-based Modular Plant (Yakutia concept) | Rosatom | Russia | LEU | PWR | No* | Yes | Planned/announced* | 5-7* | ~55-110 (1-2 units)* | 40* | $500M-$1B* | $4.5M-$9M/MWe* | [Unverified] Land plant derived from marine RITM-200; costs extrapolated from remote infrastructure multipliers. |
| LeadCold SEALER-UK (concept) | LeadCold | Sweden/UK* | LEU/HALEU (fast)* | Lead | No* | Yes | Concept/feasibility* | 20-30* | 3-10* | 30* | $90M-$160M* | $9M-$30M/MWe* | [Unverified] Alternative siting concept for SEALER in UK; values mirror SEALER-Arctic assumptions. |
| Rolls-Royce Microreactor (UK defence) | Rolls-Royce | UK | HALEU* | Gas or heat pipes* | Yes* | Yes* | R&D/Demonstrator* | 8-10* | 1-10* | 10-20* | $30M-$120M* | $12M-$30M/MWe* | [Unverified] UK MOD microreactor initiatives reported; values benchmarked to peer systems. |
| MARVEL (INL test microreactor) | DOE/INL | USA | HALEU* | Sodium-potassium eutectic (NaK) or primary loop* | No* | Yes | Under construction/testing at INL* | n/a (test)* | ~0.1-0.2 (100-200 kWe)* | N/A | $10M-$20M* | $50M-$200M/MWe* | [Unverified] Included as U.S. microreactor test article; high $/MW reflects small demo scale. |
| X-energy Xe-Mobile (alt branding to XENITH)* | X-energy | USA | TRISO | Helium | Yes* | Yes* | Concept/pre-app* | 20* | ~3-5* | 20* | $60M-$120M* | $12M-$24M/MWe* | [Unverified] Alternate naming observed; values aligned with XENITH envelope. |
| ACP100 (CNNC floating plant) | CNNC (China National Nuclear Corporation) | China | LEU (PWR) | PWR (light water) | No* | Yes | Under construction (Linglong One land demo); floating variant planned* | 24 months* | ~125* | 60* | $400M-$600M* | $3.2M-$4.8M/MWe* | [Unverified] ACP100 (Linglong One) is a land SMR; floating barge variant announced. Costs from Chinese SMR project estimates. |
| BWRX-300 Barge Concept | GE Hitachi | USA/Canada* | LEU (BWR) | BWR (light water) | No* | Yes | Land version in licensing (Canada); barge variant conceptual* | 24 months* | ~300* | 60* | $1B-$1.5B* | $3.3M-$5M/MWe* | [Unverified] BWRX-300 is a land SMR; floating/barge deployment discussed in industry. Costs from land SMR benchmarks plus marine premium. |
| NuScale VOYGR Barge Concept | NuScale Power | USA | LEU (PWR) | PWR (light water, integral) | No* | Yes | NRC-certified (land); barge/floating variant conceptual* | 24 months* | ~77 per module; 4-12 modules per plant* | 60* | $500M-$1.2B per 4-module barge* | $4M-$6M/MWe* | [Unverified] NuScale modules are NRC-certified for land; floating deployment discussed. Costs from VOYGR project estimates plus marine integration. |
| SMART (Korea floating plant) | KAERI / KEPCO | South Korea | LEU (PWR) | PWR (integral) | No* | Yes | Licensed in Korea; export/floating variants under development* | 36 months* | ~100* | 60* | $300M-$500M* | $3M-$5M/MWe* | [Unverified] SMART is a land/barge-capable integral PWR; costs from Korean SMR project data. |
| ATOMBARGE (Korea concept) | Samsung Heavy Industries / KEPCO* | South Korea | LEU (PWR)* | PWR* | No* | Yes | Concept/feasibility* | 24-36 months* | ~100-200* | 60* | $400M-$700M* | $3.5M-$5M/MWe* | [Unverified] Korean floating nuclear barge concept; values benchmarked to SMART and regional SMR costs. |
| Holos Quad (Holos Energy) | Holos Energy | USA | HALEU* | Gas-cooled (HTGR)* | Yes* | Yes* | Pre-licensing/development* | 8-10* | ~1.5-3* | 10-20* | $30M-$60M* | $15M-$30M/MWe* | [Unverified] Holos Quad is a compact HTGR microreactor; values from company materials and peer microreactor benchmarks. |
| BWXT Advanced Microreactor (Project Pele) | BWXT Advanced Technologies | USA | HALEU (TRISO)* | Heat pipes* | Yes | No* | DOD Project Pele; prototype planned* | 3-5* | 1-5* | 10* | $30M-$80M* | $15M-$30M/MWe* | [Unverified] Project Pele is a DOD transportable microreactor; values from program announcements and peer systems. |
| Terrestrial Energy IMSR (Integral Molten Salt Reactor) | Terrestrial Energy | Canada/USA | HALEU in molten fluoride salt* | Molten salt (primary) with steam secondary* | No* | Yes | Pre-licensing in Canada (CNSC) and USA (NRC)* | 7 (core replacement)* | ~195* | 40* | $500M-$800M* | $2.5M-$4M/MWe* | [Unverified] IMSR is a modular MSR with sealed core replacement; costs from company estimates and SMR benchmarks. |
| Moltex SSR-W (Stable Salt Reactor - Wasteburner) | Moltex Energy | Canada/UK | Recycled/used fuel in molten chloride salt* | Molten salt (primary) with steam secondary* | No* | Yes | Pre-licensing in Canada (CNSC)* | Continuous online refueling* | ~300* | 40* | $600M-$1B* | $2M-$3.3M/MWe* | [Unverified] SSR-W is a fast-spectrum MSR using recycled fuel; costs from company projections and MSR benchmarks. |
| Newcleo LFR-AS-30 (Lead Fast Reactor) | Newcleo | France/Italy/UK | MOX (recycled Pu/U)* | Lead-cooled fast reactor | No* | Yes | Development; aiming for first unit ~2030* | 5-7* | ~30* | 60* | $100M-$200M* | $3.3M-$6.7M/MWe* | [Unverified] Newcleo LFR-AS-30 is a small lead-cooled fast reactor using MOX; costs from company materials and lead-cooled benchmarks. |
| Newcleo LFR-AS-200 | Newcleo | France/Italy/UK | MOX (recycled Pu/U)* | Lead-cooled fast reactor | No* | Yes | Development; planned after LFR-AS-30* | 5-7* | ~200* | 60* | $500M-$900M* | $2.5M-$4.5M/MWe* | [Unverified] Larger variant of Newcleo LFR; costs scaled from LFR-AS-30 and SMR benchmarks. |
| Elysium Molten Chloride Salt Fast Reactor (MCSFR) | Elysium Industries | USA | HALEU or used fuel in molten chloride salt* | Molten chloride salt* | No* | Yes | Pre-development/concept* | Continuous online refueling* | ~50-150* | 40* | $200M-$500M* | $2M-$4M/MWe* | [Unverified] Elysium MCSFR is a fast-spectrum MSR concept; values from company presentations and MSR benchmarks. |
| Kairos Power Hermes (demo) / KP-FHR | Kairos Power | USA | TRISO in molten fluoride salt (FHR)* | Molten fluoride salt coolant (FHR)* | No* | Yes | Hermes demo under NRC construction permit review; commercial KP-FHR in pre-licensing* | 24-48 months* | Hermes: 35 MWth (no elec); KP-FHR: ~140 MWe* | 40* | Hermes: $100M-$200M; KP-FHR: $400M-$700M* | KP-FHR: $2.9M-$5M/MWe* | [Unverified] Hermes is a non-electric demo; KP-FHR is the commercial fluoride-salt-cooled high-temp reactor. Costs from company estimates. |
| TerraPower Natrium | TerraPower | USA | HALEU (metallic, fast)* | Sodium-cooled fast reactor | No* | Yes | Under construction (Kemmerer, WY); NRC licensing in progress* | 18-24 months* | ~345 (base) + 500 peak with molten salt storage* | 60* | $2B-$4B (FOAK)* | $5.8M-$11.6M/MWe (base)* | [Unverified] Natrium is a sodium fast reactor with integrated energy storage; costs from DOE ARDP funding and project announcements. |
| Last Energy PWR-20 | Last Energy | USA/Europe* | LEU (PWR)* | PWR (light water)* | No* | Yes | Pre-licensing; aiming for first units mid-2020s* | 24 months* | ~20* | 60* | $60M-$120M* | $3M-$6M/MWe* | [Unverified] Last Energy PWR-20 is a small modular PWR; costs from company materials and small PWR benchmarks. |
| Nuward (EDF SMR) | EDF / TechnicAtome | France | LEU (PWR) | PWR (light water, integral) | No* | Yes | Pre-licensing in France; targeting first unit ~2030* | 24 months* | ~170 per module (2-module plant ~340 MWe)* | 60* | $2B-$3B (2-module plant)* | $5.9M-$8.8M/MWe* | [Unverified] Nuward is a French integral PWR SMR; costs from EDF project estimates and European SMR benchmarks. |
| Rolls-Royce SMR | Rolls-Royce SMR Ltd | UK | LEU (PWR) | PWR (light water) | No* | Yes | Generic Design Assessment (GDA) in progress with UK regulator* | 18-24 months* | ~470* | 60* | $2.5B-$3.5B* | $5.3M-$7.4M/MWe* | [Unverified] Rolls-Royce SMR is a UK PWR SMR; costs from company estimates and UK project data. |
| BREST-OD-300 (Lead-cooled fast reactor) | NIKIET / Rosatom | Russia | MOX/Nitride (fast)* | Lead-cooled fast reactor | No* | Yes | Under construction (Seversk); commissioning targeted ~2026-2027* | 5-7* | ~300* | 60* | $1B-$1.5B* | $3.3M-$5M/MWe* | [Unverified] BREST-OD-300 is a Russian lead-cooled fast reactor demo; costs from Russian nuclear project estimates. |
| SVBR-100 (Lead-bismuth fast reactor) | AKME-Engineering / Rosatom | Russia | MOX (fast)* | Lead-bismuth eutectic | No* | Yes | Design certification in progress* | 7-10* | ~100* | 60* | $300M-$500M* | $3M-$5M/MWe* | [Unverified] SVBR-100 is a Russian lead-bismuth fast reactor; costs from Russian SMR project estimates. |
| CEFR (China Experimental Fast Reactor) - derivative concepts | CIAE / CNNC | China | MOX/U-Pu (fast)* | Sodium-cooled fast reactor | No* | Yes | CEFR operational; commercial derivatives (CFR-600) under construction* | 12-24 months* | CEFR: ~20; CFR-600: ~600* | 40-60* | CFR-600: $1.5B-$2.5B* | CFR-600: $2.5M-$4.2M/MWe* | [Unverified] CEFR is a small sodium fast reactor; CFR-600 is the commercial scale-up. Costs from Chinese fast reactor project data. |
| Toshiba 4S (Super-Safe, Small and Simple) | Toshiba | Japan | HALEU metallic (fast)* | Sodium-cooled fast reactor | No* | Yes | Development paused/inactive* | 30* | ~10* | 30* | $100M-$200M* | $10M-$20M/MWe* | [Unverified] Toshiba 4S was a long-life sodium fast reactor; program inactive post-Fukushima. Costs from historical project estimates. |
| GE Hitachi PRISM (Power Reactor Innovative Small Module) | GE Hitachi | USA | Metallic (U-Pu-Zr, fast)* | Sodium-cooled fast reactor (pool-type) | No* | Yes | Design available; no active deployment* | 18-24 months* | ~311 per module* | 60* | $1B-$2B per module* | $3.2M-$6.4M/MWe* | [Unverified] PRISM is a pool-type sodium fast reactor; costs from GE Hitachi estimates and fast reactor benchmarks. |
| Holtec SMR-160 | Holtec International | USA | LEU (PWR) | PWR (light water, integral) | No* | Yes | NRC pre-application review* | 24 months* | ~160* | 60* | $500M-$900M* | $3.1M-$5.6M/MWe* | [Unverified] Holtec SMR-160 is an integral PWR SMR; costs from company estimates and SMR benchmarks. |
| StarCore Nuclear (formerly Atomos) - Starcore | StarCore Nuclear | USA | HALEU* | Heat pipes* | Yes* | Yes* | Pre-development* | 10-20* | 1-10* | 20* | $30M-$100M* | $10M-$30M/MWe* | [Unverified] StarCore (formerly Atomos) is developing a heat-pipe microreactor; values from company materials and peer benchmarks. |
| Natura Resources Atomic Battery | Natura Resources | USA | HALEU* | Heat pipes* | Yes* | Yes* | Pre-development* | 10-20* | 1-5* | 20* | $30M-$80M* | $15M-$30M/MWe* | [Unverified] Natura Resources is developing a microreactor ‘atomic battery’; values from company materials and peer benchmarks. |
| Radiant Kaleidos (duplicate check - same as row 2) | Radiant | USA | TRISO (HALEU)* | Gas-cooled* | Yes* | Yes* | DOME testing planned ~2026* | 8-10* | 1.2* | 10-20* | $20M-$40M* | $17M-$33M/MWe* | [Duplicate] Same as Kaleidos entry above; included for completeness. |
| Oklo PowerHouse (larger variant) | Oklo | USA | HALEU metallic (fast)* | Heat pipes* | No* | Yes | Concept/pre-licensing* | 10-20* | 15-50* | 20* | $100M-$300M* | $6M-$15M/MWe* | [Unverified] Oklo PowerHouse is a larger variant of Aurora; values extrapolated from Aurora and scaled. |
| Oklo Aurora | Oklo | USA | N/A | N/A | N/A | N/A | NRC licensing history; demonstration siting (TBD) | N/A | N/A | N/A | N/A | N/A | [Unverified] Placeholder until sources added. |
| USNC Micro (MMR) | USNC | USA/Canada | N/A | N/A | N/A | N/A | CNSC VDR; U of I demonstration (TBD) | N/A | N/A | N/A | N/A | N/A | [Unverified] Placeholder until sources added. |
| BWXT BANR | BWXT | USA | N/A | N/A | N/A | N/A | DoD pilot interest (TBD) | N/A | N/A | N/A | N/A | N/A | [Unverified] Placeholder until sources added. |
Table Legend and Notes
Columns: Reactor = design name. Company = developer. Country = country of origin. Fuel Type = fuel form. Cooling Type = coolant/heat-transfer medium. Mil. / Civ. = whether the design is offered for military and/or civilian use. Regulatory Status = licensing progress. Refuel (yr) = refuelling interval in years. Power (MWe) = electrical output in megawatts. Life (yr) = estimated operating lifespan in years. Total Cost (USD) = estimated total construction cost. Cost/MW (USD/MWe) = estimated cost per megawatt of electrical capacity.
An asterisk (*) marks a value that is derived, estimated, or otherwise unverified in the source – typically inferred from a reactor class or scaled from microreactor cost ranges rather than a published figure. Cells marked N/A have no value in the source.
Source: archerships compilation of manufacturer and program figures, maintained as a Google Sheet: https://docs.google.com/spreadsheets/d/1QCy1sbGV2DsNneTb-2vMLZcl1RxCzKfppJ6vW7nWPZ0/
Rows marked Unverified or partially verified in the source’s Notes column carry the developer’s or program’s claims, not independently confirmed figures.
[No columns defined in frontmatter]
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