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A Pressurized Water Reactor 1 5 1 5 reload fuel assembly has 2 0 4 fuel rods with 0 . 4 2 2 inch diameters
A Pressurized Water Reactor reload fuel assembly has fuel rods with inch diameters on a inch square pitch. There are guide tube thimbles in the assembly with a diameter of inches. The fuel assembly has a pitch of inches. For a system pressure of psia, a bulk fluid temperature of F and an assembly mass flux of in the rodded region of the bundle. The fluid properties are given as:
determine the single phase pressure drop from the inlet nozzle to the top of the fuel assembly. The fuel rod length is feet. The top and bottom nozzles are each inches high for an overall assembly length of feet. There are spacer grids equally spaced along the rod bundle. The top and bottom grids are egg crate style grids which have a blockage ratio of of the bundle flow area. The remaining grids are mixing vane grids which a grid blockage ratio of of the bundle flow area and a mixing vane blockage of of the bundle flow area. The inlet fuel nozzle has a loss coefficient of and the exit nozzle has a loss coefficient of Both of the nozzle loss coefficients account for the contractionexpansion of the flow from the plenum regions into the rodded regions. The flow area through the nozzles is of the open area characterized by the assembly pitchFor determining the rod friction factor, use the correlations given in the notes for a smooth tube McAdamsBlausis and for both spacer grids, and use Yao et al model points
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