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

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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%


Memo 1 project design conditions

  • 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


Memo 1 project design conditions

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


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