Low-Activation Steel (RAFM)

Reduced-activation ferritic-martensitic steel designed to decay quickly after irradiation.

RAFM steels replace elements that would form long-lived isotopes, so that after irradiation the material decays to hands-on levels in decades rather than millennia. They are a leading structural choice for the neutron-heavy breeder.

Low-activation ferritic-martensitic steels are engineered to omit the elements that would form long-lived radioactive isotopes, so that after irradiation they decay to hands-on levels in decades rather than millennia. They are the structural backbone of the neutron-heavy breeder and the reason fusion's waste can be bounded and short-lived.