%0 Journal Article %A Tadashi Watanabe and Jinya Katsuyama and Akihiro Mano %D 2019 %J International Journal of Nuclear and Quantum Engineering %B World Academy of Science, Engineering and Technology %I Open Science Index 155, 2019 %T Comparison of Two-Phase Critical Flow Models for Estimation of Leak Flow Rate through Cracks %U https://publications.waset.org/pdf/10010869 %V 155 %X The estimation of leak flow rates through narrow cracks in structures is of importance for nuclear reactor safety, since the leak flow could be detected before occurrence of loss-of-coolant accidents. The two-phase critical leak flow rates are calculated using the system analysis code, and two representative non-homogeneous critical flow models, Henry-Fauske model and Ransom-Trapp model, are compared. The pressure decrease and vapor generation in the crack, and the leak flow rates are found to be larger for the Henry-Fauske model. It is shown that the leak flow rates are not affected by the structural temperature, but affected largely by the roughness of crack surface. %P 516 - 519