I’m running several simulations with the same materials (the only changes are in the geometry), is there a way to pre-load all the effective sections of this geometry and not do it for each of the iterations?
(and, by chance, to pre-load all the isotopes during a depletion and run several of them).
I would recommend openmc lib for running parameter studies where all the cross sections are loaded at once. This example varies the material enrichment but is perhaps a good starting point.