The IBM-704 program RE-147is used-to calculate the time and space-dependent temperature distribution in a solid cylindrical fuel pin, cooled on the surface, with inter¬nal heat generation. The fuel pin may be bare or clad, and its boundary may be cooled by either flowing or stagnant coolant. The heat generation source may also be time and space dependent.nSpecifically, the Program considers the fuel pin to be composed of two regions and then solves, by the usual finite difference methods, the heat conduction partial differ¬ential equation in the two regions. Simultaneously, the axial and time variation of the coolant temperature is calculated by a finite difference approximate solution of the energy equation for the coolant.
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