Stellaria, founded in 2023 in Grenoble, France, is pioneering the development of a compact 4th generation Advanced Modular Reactor (AMR) employing liquid fuel, the Stellarium.
Fuel cycle
Stellaria’s Stellarium reactor is designed to renew 100% of its fuel during operation. By using a fast neutron spectrum and liquid fuel salts, the reactor can recycle spent nuclear fuel and consume long-lived radioactive waste. This innovation drastically reduces the need for fresh uranium, minimizes waste output, and contributes to a more sustainable nuclear fuel cycle.
Reactor design
Unlike conventional pressurized-water reactors, Stellarium operates at low pressure using molten salt as both fuel carrier and coolant. This enhances safety, stability, and efficiency. The compact and modular architecture allows for deployment in industrial sites or as part of a flexible energy grid. Producing both electricity and process heat, the reactor is designed to support energy-intensive industries while complementing renewable energy sources with reliable, carbon-free baseload power.