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-concrete system under randomizationUeki, Taro
no journal, ,
Analysis framework under indeterminate material distribution is investigated for the Monte Carlo (MC) criticality calculation of continuously mixed media formed via molten core concrete interaction. Randomized Weierstrass functions (RWF) are utilized to represent the volume fractions of constituent materials. The possibility of several percent fluctuation of effective multiplication factor is shown by the MC simulation with delta-tracking.
Ueki, Taro
no journal, ,
In this excerpt, it is shown that the delta-tracking combined with a voxel mesh and an index search is an efficient tool for the reactor physics analysis of random media. The essential idea is the use of delta-tracking in a selected region consisting of a base material where voxel mesh is overlaid, a particle flights by ignoring the mesh cell boundaries, and a fast index search is applied at the flight destination to identify where the particle is. It turns out that computational time remains the same over numbers of voxel mesh cells from the fourth power of ten to the eleventh power of ten. Numerical results are demonstrated in terms of the criticality analysis of the random substitution of SUS304 in fuel debris.