Assessment of thermal fatigue induced by dryout front oscillation in printed circuit steam generator
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A printed circuit steam generator (PCSG) is being considered as the component for pressurized waterreactor (PWR) type small modular reactor (SMR) that can further reduce the physical size of the system. Since a steam generator in many PWR-type SMR generates superheated steam, it is expected that dryoutfront oscillation can potentially cause thermal fatigue failure due to cyclic thermal stresses induced bythe transition in boiling regimes between convective evaporation and film boiling. To investigate thefatigue issue of a PCSG, a reference PCSG is designed in this study first using an in-house PCSG designtool. For the stress analysis, a finite element method analysis model is developed to obtain the temperatureand stress fields of the designed PCSG. Fatigue estimation is performed based on ASME Boilerand pressure vessel code to identify the major parameters influencing the fatigue life time originatingfrom the dryout front oscillation. As a result of this study, the limit on the temperature difference betweenthe hot side and cold side fluids is obtained. Moreover, it is found that the heat transfer coefficientof convective evaporation and film boiling regimes play an essential role in the fatigue life cycle as well asthe temperature difference.
Abstract
A printed circuit steam generator (PCSG) is being considered as the component for pressurized waterreactor (PWR) type small modular reactor (SMR) that can further reduce the physical size of the system. Since a steam generator in many PWR-type SMR generates superheated steam, it is expected that dryoutfront oscillation can potentially cause thermal fatigue failure due to cyclic thermal stresses induced bythe transition in boiling regimes between convective evaporation and film boiling. To investigate thefatigue issue of a PCSG, a reference PCSG is designed in this study first using an in-house PCSG designtool. For the stress analysis, a finite element method analysis model is developed to obtain the temperatureand stress fields of the designed PCSG. Fatigue estimation is performed based on ASME Boilerand pressure vessel code to identify the major parameters influencing the fatigue life time originatingfrom the dryout front oscillation. As a result of this study, the limit on the temperature difference betweenthe hot side and cold side fluids is obtained. Moreover, it is found that the heat transfer coefficientof convective evaporation and film boiling regimes play an essential role in the fatigue life cycle as well asthe temperature difference.
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