Analysis of Pu-238 and Fe-56 Evaluated Data for Use in MYRRHA

A sensitivity analysis on the multiplication factor, k(eff), to the cross section data has been carried out for the MYRRHA critical configuration in order to show the most relevant reactions. With these results, a further analysis on the Pu-238 and Fe-56 cross sections has been performed, comparing the evaluations provided in the JEFF-3.1.2 and ENDF/B-VII.1 libraries for these nuclides. Then, the effect in MYRRHA of the differences between evaluations are analysed, presenting the source of the differences. With these results, recommendations for the Fe-56 and Pu-238 evaluations are suggested. These calculations have been performed with SCALE6.1 and MCNPX-2.7e.