The safety issue, one of the main concerns of nuclear power generation, is closely related to the thermal hydraulic phenomena which occur in nuclear power plant systems. Thus it is necessary to understand various academics in the thermal-hydraulic areas, in which the key subjects are fluid mechanics, thermodynamics, heat transfer, and two-phase flow.

Understanding basic fundamental and performing relevant researches through practical experiments and numerical analysis may provide a first principle to secure the safety of the nuclear reactors. To the standpoint of nuclear thermal-hydraulics, the thermal-hydraulic system behavior and corresponding normal and transient analysis need to be investigated and validated using the latest engineering techniques.

To setup a high standard nuclear safety, design basis accident (DBA) scenarios are hypothesized and analyzed with reliable engineering approaches. In addition to the DBA, severe accidents are also analyzed using relevant analytical models. Through these activities, severe accident mitigation strategies can be proposed and developed for the improved core protection as well as effective regulatory principles.

Recently, the nuclear energy demand becomes more diverse and the safety analysis technique using computer simulation tools have been in a rapid development. Benefited by this trend, design of small and medium-sized (SMR) and more advanced nuclear reactors have been studied actively to open up more opportunities for utilizing nuclear energy.