1D Two-Fluid Model simulations of Flashing Flows in TOPFLOW Facility

The decompression experiment performed at TOPFLOW (acronym for Transient twO Phase FLOW) in 2011 has been reproduced using an in-house code WAHA as well as the latest bestestimate thermohydraulic system code TRACE. The evaporation of liquid water to steam caused by depressurization was simulated in about 8 m long vertical tube with an inner diameter of 195.3 mm. The liquid water was almost saturated at initial pressure value of 6.5 MPa. Simulations successfully reproduced the main features of the experiment’s pressure and temperature history.