ICONE19-43676 Assessment of Choking Flow Models for Subcooled Flashing Flow through Steam Generator Tube Cracks

The state-of-the-art modeling of leak rates through individual pipe stress corrosion cracks is based on regression analysis of experimentally determined leak rates and defects size. This has relatively large uncertainties. Accurate leak rate predictions require two key parameters, crack area and choking flow rate. The thermalhydraulics models employed in the leak rate calculations are generally based on the Henry-Fauske model of two-phase flow …