Greetings @tjlaboss,
Sorry for the late reply, and thanks for the references. While I’m still researching for interesting way of grouping / homogenizing the fuel in full core, from last week i tried to be very simple; I separate the fuel materials according to this scheme:
It’s akin to the null homogenization in Dr. Boyd’s work, except I homogenized it even further by grouping the symmetrically-equivalent assemblies together (to force the symmetry, otherwise the result may be asymmetrical, like the case below)