ConductionFuelCladding_web

ConductionFuelCladding_web - ENU 4134 – Conduction in...

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Unformatted text preview: ENU 4134 – Conduction in Fuel & Cladding D. Schubring October 27, 2010 Learning Objectives I 3-c Solve the equations for conduction in fuel and cladding and articulate assumptions/models used regarding fuel thermal conductivity I 5-b Use correlations and/or models to analyze problems in nuclear thermal hydraulics I 5-f Identify TH-related safety limits for light water reactor operation I 5-g Consider conservatism (or lack thereof) present in a model and evaluate implications of this for reactor safety analysis Nuclear Heat Transfer The heat from fission is primarily deposited in the fuel and must eventually be dissipated into the coolant. It passes through the following materials: I Fuel I Gap I Cladding I Clad-coolant interface What mechanisms of heat transfer dominate in each? Nuclear Heat Transfer (2) We will derive the following equations in the next few days: T co- T m = q 2 π R co htc (1) T ci- T co = q 2 π k c ln R co R ci (2) T fo- T ci = q 2 π R g htc g = q π ( R ci + R fo ) htc g (3) T max- T fo = q 4 π k f (4) Coupling the changing coolant temperature through the core ( i.e. , including the function dependence on z ), comparing q 00 to CHF limits, and consideration of subcooled boiling limits will be...
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ConductionFuelCladding_web - ENU 4134 – Conduction in...

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