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Researchers from Westinghouse Electric Company and the Consortium for Advanced Simulation of LWRs (CASL), a U.S. Department of Energy (DOE) Innovation Hub, performed core physics simulations of the AP1000® PWR startup core using CASL’s Virtual Environment for Reactor Application (VERA). These calculations, performed on the Oak Ridge Leadership Computing Facility  (OLCF) “Titan” Cray XK7 system, produced 3D high-fidelity power distributions representing the conditions expected to occur during the AP1000 start-up. The set of results obtained provide insights that improve understanding of core conditions, helping to ensure safe startup of the AP1000 PWR first core.

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