The secondary side of the HOTSG is divided into single-phase liquid region, nucleate boiling region, postdryout region, and singlephase vapor region. Different heat transfer correlations and pressure drop correlations are reviewed and applied. To benchmark the developed physical models and the computer code, H-OTSGs developed in Marine Reactor X and System-integrated Modular Advanced ReacTor are simulated by the code, and the results are compared with the design data. | Development of a computer code for thermalehydraulic design and analysis of helically coiled tube once-through steam generator
