Detailed resonance absorption calculations with the Monte Carlo code MCNP and a collision probability version of the slowing down code ROLAIDS

摘要

Very accurate Monte Carlo calculations with MCNP have been performed to serve as a reference for benchmark calculations on resonance absorption by (sup 238)U in a typical PWR pin-cell geometry. Calculations with the energy-pointwise slowing down code ROLAIDS-CPM show that this code calculates the resonance absorption accurately. Calculations with the multigroup discrete ordinates code XSDRN show that accurate results can only be achieved with a very fine energy mesh. (orig.) (ERA citation 19:034736)