We present the METERO-V experimental facility which is a closed water loop, equipped with a test section made of two halves of PWR-type rod bundles (8x34 rods and four grids) at full scale. The aim of the experimental facility is to implement independent injection of different flow rates, void fraction and temperatures at the inlet of each half rod bundle. METERO-V experimental program focuses on IBLOCA (Intermediate Break Loss of Coolant Accident), SBLOCA (Small Break) and SLB (Steam Line Break) situations where significant density effects may occur in the core, with the aim to develop models for system-scale codes and to validate them in a separated-effect way for CFD to system thermal-hydraulic scales. We present the first results for an unbalanced flow rate distribution at the inlet of the test section, varying the Reynolds number from laminar regime to fully turbulent regime. We measure pressure difference in the radial direction of the flow at different heights and relate it to velocity measurements performed thanks to PIV. The PIV measurements are also performed at different heights, either in the bare rod region or in the wake of mixing grids. Reproducibility and accuracy of the measurements is very good. Future work will consist in non-symmetrical injections of temperatures and void fraction.