Validation of 241Am Capture Cross Section through Integral Test Using Criticality Data of Light-water Moderated MOX Cores

In the present study, the possibility of further revision of 241Am capture cross section was studied through the integral test for Pu ageing problem by reflecting the recent experimental data. Three criticality data of a light-water moderated MOX core with different experiment date (7 years interval at maximum) have been analyzed with JENDL-3.3 and 4.0 libraries. In addition, the calculations with the number density of 241Am multiplied by 1.18 for JENDL-3.3 and by 1.08 for JENDL-4.0 were also conducted to simulate the increase of 241Am capture cross section suggested by the recent measurement. The results show that the increase tendency of k-eff as a function of time observed in the calculations with JENDL-4.0 is not found in those with modified 241Am number density. This means that the improvement of 241Am capture cross section will be achieved by employing the recent experimental data.