The development of natural circulation operation support program for ship nuclear power machinery

Analysis of Reverse Flow for Single Phase Fluid Inside U-Tubes of Steam Generator

“…They pointed out that the reverse flow occurred inside the shorter U-tube [5]. Using the code Relap/Mod3.3, Hao et al analyzed the natural circulation of single-phase flow for PWR by classifying U-tubes according to their length [6]. They shown that the relationship between the characteristic pressure drop (CPD) and the length of U-Tube was nonlinear when the reverse flow happened, and there existed a length of U-Tube which had the largest CPD [7,8].…”