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Memo #1 Project design conditions. Objective : To determine whether replacement of standard oxide fuel in a large BWR by hydride fuel will result in a higher power Conditions Reference core: see tables in Lecture #2 Rod pitch and rod OD are variables, but must fit in existing duct
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Memo #1 Project design conditions • Objective: To determine whether replacement of standard oxide fuel in a large BWR by hydride fuel will result in a higher power • Conditions • Reference core: see tables in Lecture #2 • Rod pitch and rod OD are variables, but must fit in existing duct • The number of rods in bundle is a variable • The hydride fueled fuel assembly has no water rods • Cladding thickness and initial fuel-cladding gap are variables, but can be chosen around the values in Figs 2.7 and 2.8 of NUREG – 1754 • enrichment of hydride fuel not to exceed 20%; oxide 5%
For calculating the thermal conductivity of hydride fuel use: kU = 0.28 W/cm-K (dispersed phase); kZrH = 0.18 W/cm-K (continuous phase) • Burnup goal: Total energy output equivalent to 60 MWd/kgU in oxide design • no refueling • LHR distribution (pending neutronic analysis): where = r/Rcore -1/2 < z/L < 1/2 • liquid-metal bond can be used in hydride design; He bond in oxide
Inlet nozzle orificing: - none (same flow rate to all bundles) - to produce the same enthalpy rise for all bundles • Constraint on outlet quality: 0.23 • maximum pressure drop over core: 200 kPa • main T-H constraint: Critical power ratio (CPR) • fuel composition: 21 vol. % U metal in ZrH1.6; or 45 wt % U
