The Station Blackout (SBO) accident is a typical design extension condition, and during the optimization of SBO power supply design, it is essential to fully consider the nuclear safety requirements for SBO conditions as stipulated by nuclear safety regulations. The safety characteristics of pool-type sodium-cooled fast reactors (SFRs) are significantly different from those of pressurized water reactors (PWRs). By combining the inherent safety of fast reactors, it is analyzed that SFR units need to ensure the removal of reactor residual heat, containment isolation, spent fuel cooling, post-accident monitoring, and control room habitability during SBO conditions. Nuclear safety function analysis and temperature rise analysis methods are used to study the system electrical loads that need to be equipped with SBO power supply. This approach enhances the economic efficiency of sodium-cooled fast reactors while ensuring nuclear safety requirements, providing a reference for the optimization of SBO power supply design for similar reactor types.