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Figure 17    Radial Temperature Profile Across a Fuel Rod and Coolant Channel

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Heat Transfer HEAT GENERATION However, the rate of increase will vary along with the linear heat flux of the channel.  The power density  and  linear  heat  rate  will  follow  the  neutron  flux  shape.    However,  the  temperature distributions  are  skewed  by  the  changing  capacity  of  the  coolant  to  remove  the  heat  energy. Since the coolant increases in temperature as it flows up the channel, the fuel cladding and, thus, the fuel temperatures are higher in the upper axial region of the core. A radial temperature profile across a reactor core (assuming all channel coolant flows are equal) will basically follow the radial power distribution.   The areas with the highest heat generation rate (power) will produce the most heat and have the highest temperatures.  A radial temperature profile for an individual fuel rod and coolant channel is shown in Figure 17.   The basic shape of  the  profile  will  be  dependent  upon  the  heat  transfer  coefficient  of  the  various  materials involved.  The temperature differential across each material will have to be sufficient to transfer the heat produced.   Therefore, if we know the heat transfer coefficient for each material and the heat flux, we can calculate peak fuel temperatures for a given coolant temperature. Figure 17    Radial Temperature Profile Across a Fuel Rod and Coolant Channel Rev. 0 Page 49 HT-02



   


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