CFD applications to pressurized thermal shock-related phenomena (Contract research, Translated document)

Okagaki, Yuria  ; Hibiki, Takashi*; Shibamoto, Yasuteru 

In PWR accident scenarios, the injection of water from the ECCS (ECC injection) might result in thermal stratification in the case of the insufficient mixing of cold and hot water and induce a PTS, affecting the RPV integrity. Therefore, PTS is a vital research issue in reactor safety, and its analysis is essential for evaluating the integrity of RPVs, which determines the reactor life. The PTS analysis comprises a coupled analysis between thermal-hydraulic and structural analysis. Especially in the thermal-hydraulic approach, reliable CFD simulations should play a vital role in the future because predicting the temperature gradient of the RPV wall requires data on the transient temperature distribution of the DC. This study reviewed from the viewpoint of the turbulence models most affecting PTS analysis based on papers published since 2010 on single- and two-phase flow CFD simulation for the experiment on PTS performed in the ROCOM, Transient TOPFLOW, UPTF, and LSTF.