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In a nuclear reactor fuel assembly with triangular lattice, water flows upward at pressure of 80 bar with inlet subcooling of 10C. The fuel assembly has height of 3.7m, fuel rod diameter of 9.3mm, and fuel lattice pitch of 12.1mm. The fuel assembly has uniform heat flux of 0.28MW/m2, and the water flow mass flux is 1,810kg/m2.s. 1. Determine the major locations (Onset of nucleate boiling, Onset of significant void, and bulk saturation point). 2. Calculate the axial void fraction distribution (Plot the distribution using numerical tools, or manually by selecting typical locations to give void fraction values).

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