Abstract
Recently, the Fourier fundamental mode coefficient (FFMC) was formulated to advance the existing Monte Carlo fission source stationarity diagnostics. The calculation of FFMC requires a user-defined exterior geometric boundary of the fission source distribution. However, the effect of using different boundary sizes on the reliability of the proposed FFMC indicator is not understood and has never been discussed. This work used different boundaries to investigate their effect on the FFMC results based on a simple homogeneous reactor model. The results show that the choice of FFMC boundaries is also affected by the reactor model's initial source distribution and geometrical configuration. The shortcoming of the abovementioned indicator has been improved by dissociating the indicator into the corresponding Cartesian axes. The new set of indicators is further verified by the checkerboard fuel storage array and the BEAVRS full core cases.
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