Abstract

A forced-flow interchannel mixing model is presented which is applicable to LMFBR fuel assemblies containing helical-wire spacer systems. The model accounts for the directional nature of the interchannel mixing mechanism, and can be incorporated into the COBRA-II and COBRA-III B lumped-parameter computer codes. Predictions based on this model are compared with available experimental data, and with results computed using turbulent mixing models. Recommendations are made for designing future mixing experiments in rod-bundles containing helical-wire spacer systems.

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