Allan Grosvenor
CEO
True Mobile Nuclear, Finally.
40 kWe
Target continuous output
If there is no runway, road, or port, Tam Fortis is the only reactor that arrives. Five years of firm power with no diesel, no water, no concrete and no on-site crew.
POWER DESIGNED TO MOVE
Tam Fortis is building a sealed 40 kWe microreactor the size of a household refrigerator, designed to fly in by helicopter, from a Black Hawk to a CH-53, or arrive by pickup truck.
Five years of firm power with no diesel, no water, no concrete and no on-site crew.
Meltdown-proof TRISO fuel
Intact past 1,600 C. Validated across Pele, eVinci, Kaleidos, Antares, and Valar. FCM is a future upgrade path.
Intact past 1,600 C. Validated across Pele, eVinci, Kaleidos, Antares, and Valar. FCM is a future upgrade path.
Passive heritage hardware
Liquid Metal heat pipes and Be reflector from KRUSTY, rotating control drums from TOPAZ-II, sCO₂ Brayton from Sandia and the SwRI STEP grid demo.
Liquid Metal heat pipes and Be reflector from KRUSTY, rotating control drums from TOPAZ-II, sCO₂ Brayton from Sandia and the SwRI STEP grid demo.
Autonomous control for austere operations
Sentinel AI, powered by GURU. Validated physics decides consequential actions, learned models rank and prune, and symbolic rules check each action against hard physical limits under human supervision.
Sentinel AI, powered by GURU. Validated physics decides consequential actions, learned models rank and prune, and symbolic rules check each action against hard physical limits under human supervision.
MISSION-CRITICAL
APPLICATIONS
01
Defense & National Security
Tam Fortis is designed for expeditionary and mission-critical environments where compact, resilient power is required close to the point of need.
02
Rare-Earth & Critical-Mineral Processing
Tam Fortis is designed to support remote critical-mineral operations where dependable power and reduced diesel logistics are important to continuous operations.
03
Disaster Response
Tam Fortis is designed to provide deployable power for emergency operations and critical services in locations where grid infrastructure is unavailable or disrupted.
04
Remote & Critical Infrastructure
Tam Fortis is designed to support critical operations in remote or infrastructure-constrained environments where traditional energy systems are difficult to deploy.
OUR CORE
A compact, sealed microreactor platform designed for continuous power, long-duration operation and transportability. The system combines a small physical footprint with a five-year mission profile and a configuration designed to scale for higher power needs.
40 kWe
Continuous output
Continuous output
5-year mission
Sealed operating cycle
Sealed operating cycle
1.5 ton target
Under 5 ton max
Under 5 ton max
100 kWe+
Stackable configuration
Stackable configuration
INTELLIGENT OPERATION
Sentinel AI, built for autonomous operation under human supervision.
Tam Fortis is developing Sentinel AI to support autonomous reactor operation using physics-based modelling, digital-twin simulation and continuous system monitoring. Consequential actions remain governed by validated physical limits, with human oversight and shutdown authority retained.
Working Across Industry, Government & Research
Tam Fortis is engaging with organizations across nuclear technology, advanced manufacturing, defense, research and deployment.
BUILDING TOWARD DEPLOYMENT
Tam Fortis is engaging with technical facilities, nuclear experts, and industry teams as the platform moves through development.
Idaho National Laboratory
Advancing the pathway toward testing and validation.
Technical Validation
Evaluation of system design, interfaces and deployment concepts.
Regulatory Progress
Supporting the pathway from development through testing and licensing.
Leadership
Built by experts across nuclear, aerospace, defense and commercialization.
Prince Klossowski de Rola
Chief Visionary
Mark Miller
Regulatory Veteran
Chris Dawson
Applied Innovation Leader
Mollie Jahner
Strategic Advisor — Business Development & Capital Strategy
Robert Howe
Nuclear Operations Advisor
Chris Worrell
Strategic Advisor — Government Engagement
Michael Kyle
Strategic Advisor — Commercialization
Latest News
Building the future of portable power.
Tam Fortis Brings True Mobile Nuclear to TEVCON 2026
At TEVCON 2026 in San Diego, Tam Fortis presented its 40 kWe mobile microreactor alongside leaders from the NRC, Army Applications Laboratory, Defense Innovation Unit and Idaho National Laboratory, reinforcing...
Explore announcement →
Latest Progress
August 2026
AI Controls Mobile Nuclear Reactor for Autonomous Power
Tam Fortis and MSBAI demonstrated a working closed-loop control prototype using Model Predictive Control, digital-twin simulation and validated physics to support autonomous...
Latest Progress
August 2026
Tam Fortis Advances Microreactor Development at Idaho National Laboratory
The Tam Fortis team spent two days at Idaho National Laboratory visiting EBR-I, NRIC DOME, MARVEL, the Advanced Test Reactor and key...
Latest Progress
July 2026
Tam Fortis Addresses AI Safety in NRC Microreactor Framework
Tam Fortis filed formal comments on the NRC’s proposed Part 57 framework, defining a safety approach where validated physics governs safety-significant decisions...
Everything you need to know
What is Tam Fortis developing?
Tam Fortis is developing a compact, sealed nuclear microreactor designed to provide continuous power in remote, infrastructure-limited, and mission-critical environments.
How portable is the microreactor?
The current design targets transport by road or air, including deployment by pickup truck or helicopter.
Where could the system be used?
Potential applications include defense operations, disaster response, remote communities, critical infrastructure, mining, and other locations where reliable grid power is unavailable.
What is Sentinel AI?
Sentinel AI is Tam Fortis’ monitoring and control system, combining physics-based modelling, forecasting, anomaly detection and verification against defined operating limits.
Is the microreactor commercially available?
The platform is currently under development and validation. Commercial deployment will depend on testing, licensing, manufacturing and regulatory approval.