Memo 1 project design conditions
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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
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%


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: use: - 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


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