Validation of CUPID for Subchannel Scale Analysis with PSBT Thermal Mixing Test

CUPID is in-house code developed by KAERI(Korea Atomic Energy Research Institute). Its subchannel scale analysis capability has been improved in our previous works. Not only basic models of a subchannel analysis code such as turbulent mixing and void drift models, but also spacer grid and mixing vane models were implemented in recent works. In this study, the grid directed cross flow model caused by the mixing vane implemented in CUPID would be validated against the PSBT thermal mixing benchmark. In the subchannel analysis module of CUPID code, the mixing vane grid directed cross flow model was implemented. In order to validate this model, PSBT thermal mixing test was analyzed. CUPID can well simulate the outlet temperature distribution, by modifying the lateral convection factor at the corner subchannel qualitatively.