Design optimization of ship‐based 200 MWth and 250 MWt nuclear power reactors have been performed. The neutronic and thermo‐hydraulic programs of the three‐dimensional X‐Y‐Z geometry have been developed for the analysis of ship‐based nuclear power plant. Quasi‐static approach is adopted to treat seawater effect. The reactor are loop type lead bismuth cooled fast reactor with nitride fuel and with relatively large coolant pipe above reactor core, the heat from primary coolant system is directly transferred to watersteam loop through steam generators. Square core type are selected and optimized. As the optimization result, the core outlet temperature distribution is changing with the elevation angle of the reactor system and the characteristics are discussed.

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