Abstract
The 3-D extension C5G7 MOX benchmark, which is a follow-up benchmark of the C5G7 MOX on deterministic 2-D/3-D MOX fuel assembly transport calculations without spatial homogenization, aims at providing a more challenging test of the abilities of currently available 3-D methods to handle the spatial heterogeneities of reactor core. The geometry configuration was modified with some significant changes including control rod insertion in order to check real 3-D effects with the previous benchmark. In this work, THREEDANT code within DANTSYS code package, which solves the multi-group discrete ordinates form of the Boltzmann transport equation in x– y– z and r– z–theta geometries, was employed to perform the benchmark calculations with the spatial approximation to a square shape of the circular fuel pin and the angular approximation to S 8. The calculation results from THREEDANT indicate that the power decrements due to control rod insertion are larger than those in the reference solution and are also more sensitive. In addition, a sensitivity study on mesh refinement was performed to produce a higher quality solution. In the results, it is found that the 4 × 4 grid per pin cell in the THREEDANT calculation is sufficiently refined so that very little benefit is obtained by increasing the mesh size.
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