Gas-cooled fast reactor
After sodium-cooled fast reactors, fast reactors cooled with helium (gas-cooled fast reactors or GFRs) are an option being considered by CEA for transmutation. In this type of reactor, the minor actinides would be partitioned and recycled in situ. A 100 MW to 300 MW prototype could be built by around 2030 as part of an international project (ALLEGRO). Some tricky technological barriers need to be lifted, such as the resistance of the materials to high temperatures and the ability of the fuel to withstand high combustion rates.