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Study on double heterogeneity effect of Pu-rich agglomerates in mixed oxide fuel using cross section homogenization method for particle-dispersed media

Yamamoto, Toshihiro

A cross section homogenization method for media containing randomly and uniformly dispersed particles has been applied to MOX fuels containing Pu-rich agglomerates. This method (Shmakov method), which is incorporated into a Monte Carlo code MCNP, has been applied to lattice calculations of an infinite MOX fuel rod array. Shmakov method can accurately reproduce the calculation results for a heterogeneous arrangement of Pu-rich agglomerates. A correction factor used to define an effective microscopic cross section provides a quantitative indication of the double heterogeneity of Pu-rich agglomerates. The correction factors exhibit an obvious double heterogeneity effect. However, the double heterogeneity effect of Pu-rich agglomerates on k-eff seems to be unexpectedly minor because the underestimate of the reaction rates in the resonance energy range is offset by the overestimate of the reaction rates in the thermal energy range.

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Category:Nuclear Science & Technology

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