Development of mechanistic boiling two-phase flow analysis methods for the design of high-power density light water reactors

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In high-power-density tight-lattice LWRs, margin to the onset of flow instability is reduced comparing with conventional ones. The mechanisms of the transition to the CHF condition under flow oscillation conditions were hence investigated theoretically, numerically, and experimentally. It was revealed that the nonlinear wave theory can be applied to the prediction of CHF in this situation. Void fraction in subcooled boiling region is of importance in evaluating the hydraulic stability and fuel burn-up. It was demonstrated that heat transfer enhancement by sliding bubbles and bubble coalescence play important roles in determining the axial development of the void fraction.