Abstract
A numerical analysis method to predict occurrence of tube failure propagation by overheating rupture in steam generators of sodium-cooled fast reactors has been developed to expand application range of an existing computer code. Applicability of this method was investigated through the numerical analysis of an experiment on steam discharging in liquid sodium. In this experiment, one tube for steam discharging and the 91 target tubes were placed in a liquid sodium pool. The numerical analysis showed that the temperature of the target tubes increased by the effect of a reacting jet. Some of them near the initial water leak point resulted in overheating rupture as with an experimental result. While the proposed analysis method is useful for high-speed computation, this method provides a temperature distribution more widely than a real situation. To improve this conservativeness, a Lagrangian particle model for simulating the reacting jet was also developed as an alternative method. The numerical results by the program unit of this model showed that the discharged gaseous particles spread with a particle-particle and particle-tube interaction.
