Stable Salt Reactors build on the fundamental safety and simplicity breakthrough of molten salt fuel in essentially standard nuclear fuel tubes.

  • The fuel salt is held in vented tubes. Venting is safe because in our reactors the dangerous fission products form stable compounds, not gases.
  • The tubes are bundled into fuel assemblies similar to those in a conventional PWR. These are held in the support structure which forms the reactor modules. 
  • The tank is filled with a safe molten salt coolant, which is not pressurised like gas or water coolants in today’s power reactors and not violently reactive with air and water like sodium in today’s Fast Breeder reactors. A second similar coolant salt system takes heat from the primary coolant salt to our patented GridReserve energy storage system.

  • GridReserve is a collection of molten salt storage tanks that stores gigawatt scale thermal energy when it's not needed for electricity production. When demand goes up, say when renewables are off, the plant can take heat from the reactor and storage tanks to produce electricity. This is just like in a Concentrated Solar Power plant and uses the same solar salt, turning a 1GW reactor into a 3GW peaking plant. 
  • Refuelling is simple: Fuel assemblies are simply moved sideways out of the core and replaced with fresh fuel assemblies. This results in a near on-line refuelling process.
  • The entire construction is simple, with no high pressure systems, few moving parts, and no Pressure Vessel needing specialist foundries.
  • The reactor is continuously cooled by natural air flow, giving complete security against overheating in an accident situation

Single Fuel Tube and Assembly

The Stable Salt Reactor Family



Stable Salt Reactors are modular in construction. Their rectangular cores can be extended module by module to create reactors from 150MW to 1200MW power.

Many versions of Stable Salt Reactors are possible. The first being developed now is a "waste burner". This uses fuel produced by a new, low cost and very simple process from spent conventional reactor fuel. Reduction in the radioactive life of the majority of that spent fuel from hundreds of thousands of years to just a few hundred years will effectively clean up a large part of the hazardous residue of the first nuclear era. Second generation Stable Salt Reactors will be able to breed new nuclear fuel from depleted uranium and thorium.


Waste Burner reactor SSR-W
The waste burner uses existing high level nuclear waste as its fuel, and is designed for those regions with existing stockpiles from their current nuclear fleets. Storage and management of this waste is expensive and has to continue for 300,000 years. The SSR reduces the hazardous life of this waste a thousand fold.
Uranium reactor
SSR-U
Uranium is still abundant and cheap, and is likely to fuel reactors for some time to come. The SSR-U is aimed at those countries which do not have existing nuclear reactors and therefore have no waste to burn. The modest amount of waste produced by our SSR-U variant can be burned in the SSR-W too.
Thorium reactor
SSR-Th
Thorium is three times more abundant than uranium - and it is currently an unused toxic waste from the mining of the rare earths that are used in solar power and wind turbines. There is enough thorium to power the world for thousands of years.