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Rendering of Flibe thorium reactor with other system components

The Future of
Nuclear Energy

The Lithium Fluoride Thorium Reactor (LFTR) is a thermal-spectrum molten-salt reactor operating on the thorium fuel cycle.

We seek to overcome the obstacles hindering deployment of carbon-free nuclear energy by dramatically departing from current reactor technology; we will provide a new generation of reactors for a new generation of sustainability.

From small modular reactors for transport and space to multi-unit gigawatt-scale power plants on earth, LFTR is designed to be a scalable approach to nuclear energy.

The Benefits of LFTR

Each part of the reactor system has been carefully chosen for the optimal balance of performance and safety.

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Thorium Fuel

The thorium fuel cycle allows us to fuel our reactors without uranium enrichment and eliminates the long-lived waste products from other designs. Thorium is plentiful throughout the earth's crust — four times as common as uranium, 5,000 times as plentiful as gold and generally as abundant as lead.

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Liquid Fuel Form

The thorium fuel inside LFTR is in liquid form. This prevents meltdowns, increases efficiency, and allows the reactor to run at atmospheric pressure. The reactivity of the core is also self-controlling due to the density of the molten salt.

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Processing System

The integrated processing system allows for revolutionary advances in nuclear technology. Fission products and medical isotopes can be removed while recycling the fuel through the reactor to use more of the available energy. This results in a minimized waste stream with no long-lived fission products contaminating the fuel.

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Power Conversion System

LFTR's high outlet temperature of 650°C can be coupled with super-efficient advanced power conversion systems such as supercritical CO2 turbines. These highly compact systems have turbomachinery that could fit on a dinner table, reducing the footprint of LFTR power plants.

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Safe Operations

Any increase in operating temperature reduces the density of the salt which in turn, causes the reaction to slow and the temperature to fall. LFTR is also designed with a simple frozen salt plug in the bottom of the reactor core vessel. In the event of power loss to the reactor, the frozen salt plug quickly melts and the fuel salt drains down into a storage tank below — causing a termination in the fission process.

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Waste Management

LFTRs will produce far less waste than current reactors along the entire fuel cycle and process chain, from ore extraction to nuclear waste storage. Lithium reactor technology can also be used to consume the remaining fissile material available in spent nuclear fuel stockpiles around the world and to extract and resell many of the valuable fission products that are currently considered waste.

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CO2 Emissions





Proven Technology & Innovation

Flibe's LFTR is based on proven technology demonstrated during the Molten Salt Reactor Experiment (MSRE) by the US Government at Oak Ridge National Laboratory. The MSRE prototype ran for over 20,000 hours and successfully demonstrated the viability of the base design and concept.

LFTR is the modernized and improved version of the MSRE prototype with additional capabilities to take full advantage of the thorium fuel cycle. By taking advantage of these benefits, we are opening up new frontiers in medicine, industry, and more.

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LFTR Specifications

The modular design of LFTR allows for easy configuration for many different applications, both large and small.

The table shows a configuration optimized for large-scale energy production.




250 MWe

Power Conversion System

sCO2 Brayton

Cooling Options

Dry or Wet



Reactor Outlet Temp


Reactor Inlet Temp


Reactor Pressure

Near Atmospheric

Reactor Structure

Hastelloy N

Uranium Enrichment


Fuel Salt


Blanket Salt


Coolant Salt


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A Better Nuclear Future

Lithium reactors are the ultimate energy source that will propel humanity away from fossil fuels and into a true nuclear era — the thorium age of sustainable development, energy independence, and exploration of new frontiers.