SCAP (SNERDI Core Analysis Package) is a nuclear core design code system newly developed by Shanghai nuclear engineering research and design institute (SNERDI), which includes three main codes: core calculation code CYCAS, automatic link code AutoLink and lattice code PANDA. By numerical comparison and analysis between SCAP system and the next generation code MPACT developed by university of Michigan, on the one hand to validate the accuracy and applicability of SCAP system, on the other hand to analyze the performance in actual nuclear power plant simulation between the second generation and the next generation codes. The benchmark applied to compare is the first cycle of the U.S. in service nuclear power plant Watts Bar # 1. The reference values include the measured data and results calculated by Monte Carlo code KENO. The numerical results indicate that, for the general core parameters, such as critical boron concentration and control rod worth, the accuracy of SCAP and MPACT is similar; for the local parameters, such as peak power factors FΔH and FQ, some biases are observed.

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