SPECIFICATIONS FOR FLAME 1: A THREE-DIMENSIONAL REACTOR DEPLETION CODE FOR THE UNIVACLARC.
Applied mathematics lab. research and development rept.,
DAVID TAYLOR MODEL BASIN WASHINGTON D C
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The mathematical and programming specifications for FLAME 1, a three-dimensional reactor depletion code for the UNIVAC-LARC, are described. Two, three, or four lethargy groups and up to approximately 100,000 mesh points are permitted, depending on the number of groups. Mesh spacing is variable in the x-, y-, and z-directions, and up to 400 different material compositions may be distributed among the regions comprising the reactor. Thirty elements, including 13 time-dependent isotopes, are treated in the depletion scheme. The full coefficient matrix generated for each group contains of the order of 100,000 x 100,000 entries. A detailed description of the calculations performed by the code is presented, including the mathematical derivation of the normalized block iteration method used for calculating flux values and the extrapolated power method for computing the fission source and criticality factor. Author