Analysis of post boiling transition heat transfer

From the viewpoint of safety design of nuclear reactor and an economic terms, It is important to analyze the mechanism of Post Boiling Transition Heat Transfer and estimate correctly the fuel rod wall temperature. So, in this research, I modeled the phenomena of Post Boiling Transition Heat Transfer and developed a method to predict the axial variation of the fuel rod wall temperature. Furthermore, I evaluated the prediction accuracy and validity of this prediction method by comparing the prediction results with experimental data measured by Bennett et. al. which using circular tube and simulating the boiling transition in BWR under the BWR's operating conditions. From the results, it was concluded that under high pressure (7MPa) and for a wide range of conditions, the method developed in this research was able to predict accurately and conservatively. (author)