Abstract
Understanding of reflooding phenomena under oscillatory flow condition in natural circulation loop is required for the development of emergency core cooling system of a LWR, simplified BWR and so on. In this investigation, the reflooding experiment was conducted with a natural circulation loop by using liquid nitrogen as working fluid. A heating section was made of the stainless steel tube and had a 4.0 in inner diameter, 5.0 in outer diameter and 1700 mm in heating length. In this experiment, a quench propagation velocity and wall temperature fluctuations were obtained. A surface heat flux and a heat transfer has been evaluated by one-dimensional heat balance.
