The Smoothed Particle Hydrodynamics (SPH) method is proposed for studying hydrodynamic
processes related to nuclear engineering problems. A problem of possible recriticality due to
the sloshing motions of the molten reactor core is studied with SPH method. The accuracy of the
numerical solution obtained in this study with the SPH method is significantly higher than that
obtained with the SIMMER-III IV reactor safety analysis code.
