Performance Comparison of Deflector and DVI+ Duct

An ECC direct bypass fraction during a late reflood phase of a LBLOCA is strongly dependent on the cross flow velocity in a Downcomer annulus (T.S. Kwon et al., 2003, H. Glaeser, 1992,1993). In the advanced DVI+ system for APR+ and the AP1000's ECC deflector system, the effect of a cross flow to an ECC direct bypass is controlled by a steam-water separation technique. An ECC duct to separate a steam-water interaction and an ECC deflector to control the ECC momentum are considerable design feature. An ECC flow deflector has a curved plate to change the momentum direction. The ECC extension duct attached on the core barrel plays a role of a downward ECC flow subchannel in a high speed cross flow field of the downcomer