Small, sealed, transportable, autonomous reactor

Small, sealed, transportable, autonomous reactor (SSTAR) is a proposed lead-cooled nuclear reactor being primarily researched and developed in the United States by Lawrence Livermore National Laboratory.

It has a self-contained fuel source of uranium-235 and uranium-238 which will be partly consumed by fast-neutron fission and, more importantly, converted into more fissile material ("breeding" plutonium).

It should have an operative life of 30 years, providing a constant power source between 10 and 100 megawatts.

To obtain the desired 30 year life span, the design calls for a movable neutron reflector to be placed surrounding part of a column of fuel.

Because the unit will be sealed, it is expected that a breeder reaction will be used to further extend the life of the fuel.