The CUPID code was developed and is continuously updated in KAERI. Verification and validation (V&V) is mainly done for light water reactors (LWRs). This paper describes a benchmarking of the detailed mesh level compared with sub-channel level for application to pressurized heavy water reactors (PHWRs). even though component scale comparison for the PHWR moderator system was done once... https://www.ealisboa.com/limited-value-AXYS-Valhalla-Pen-must-buy/