Nuclear Data Sensitivity Analyses of OKTAVIAN Shielding Benchmark Experiments

Abstract

Nuclear data validations through the fusion neutronics shielding benchmarks for the OKTAVIAN nickel, iron, aluminum, silicon, and tungsten spheres were carried out with the MCNPX-2.5.0 code. The measured neutron and/or gamma-ray leakage spectra were compared with the calculation results using the ACE format libraries processed based on ENDF/B-VII.0, JEFF-3.1, JENDL-3.3, and FENDL-2.1. These benchmarks were suitable for the nuclear data sensitivity analyses through comparisons of the major reaction rates depending on the neutron energy. The neutron and gamma-ray leakage spectra were dominated by the productions from the (n,2n) and inelastic scattering reactions rather than those from the radiative capture reaction.