Investigation of RELAP5 Modeling Method of Single Phase Reversed Flow in Inverted U-Tube of Steam Generator

Using the code RALAP5/MOD3.2 to model and calculate the experiment of single phase reversed flow of steam generator, the results show that it is inaccurate to calculate the reversed mass flow rate using the model, which models the inverted U-tube by its length, and the new model based on it can more accurately calculate the reversed mass flow rate. Lastly, a method applied to investigate the single phase reversed flow in inverted U-tube of steam generator of nuclear plant is put forward.