Survey of the literature applicable to two-phase natural circulation flows in the hot leg of a PWR: Final report

This report reviews the two-phase flow literature relevant to the natural circulation flow in the hot leg of a pressurized water nuclear reactor during a small break loss of coolant accident. The phenomena of interest in two-phase naural circulation flows are numerous and complex. Three technical areas were identified for individual review in this report: gas-liquid flows in straight pipes; gas-liquid flows in bends; and two-phase natural circulation in reactor geometries. The literature has been surveyed, findings summarized, and suggestions have been made as to where the findings may influence thinking and model development for the reactor situation.