Heat Transfer HEAT GENERATIONIf this corrosion layer is allowed to form, a larger temperature difference will be requiredbetween the coolant and fuel to maintain the same heat flux. Therefore, operation at the samepower level will cause higher fuel temperatures after the buildup of corrosion products and crud.SummaryThe important information in this chapter is summarized below:Heat Generation Summary• The power generation process in a nuclear core is directly proportional to thefission rate of the fuel and the thermal neutron flux present.• The thermal power produced by a reactor is directly related to the mass flow rateof the reactor coolant and the temperature difference across the core.• The nuclear enthalpy rise hot channel factor is the ratio of the total kW heatgeneration along a fuel rod with the highest total kW, to the total kW of theaverage fuel rod.• The average linear power density in the core is the total thermal power dividedby the active length of the fuel rods.• The nuclear heat flux hot channel factor is the ratio of the maximum heat fluxexpected at any area to the average heat flux for the core.• The total heat output of a reactor core is called the heat generation rate.• The heat generation rate divided by the volume of fuel will give the averagevolumetric thermal source strength.Rev. 0 Page 51 HT-02
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