Thermal Decomposition of CO2 with Nuclear Heat

That is an important fact, because producing heat is easy for a nuclear reactor, but turning it into electricity requires turbines, steam and a power cycle that costs you 50 to 70% of the reactor’s output. Even small reactor cores can produce gigawatts of thermal energy… indeed, most of the cost of a nuclear reactor comes from the difficulty of containing the heat, not in producing it. Electricity produced using an MHD device or a gas turbine siphoning heat from the reactor can be used to further heat the CO2.

Source: toughsf.blogspot.com