Abstract
The PHYSICS module of COROPT calculates the power and flux distributions, power fractions, required fissile enrichment, and fuel mass balances. Sufficiently accurate data are clearly necessary for the results of the thermal hydraulic and fuel pin and assembly performance analysis to be acceptable. The smooth flux and power distribution model developed for the homogeneous core COROPT application has been shown to be accurate for homogeneous cores in the range of interest. However, this model and simple modifications of it have proven to not provide the accuracy desired for heterogeneous cores such as the LDP design. With the objective of providing a fast running approximate solution for the flux and power distributions and the other physics parametes, a new technique has been evaluated using the LDP core layout for test calculations.
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