Neutron Intensity of Fast Reactor Spent Fuel

摘要

Neutron intensity of spent fuel of the JOYO Mk_II core with a burnup of 62,500MWd/t and cooling time of 5.2 years was measured at the spent fuel storage pond. The measured data were compared with the claculated values on the JOYO core management code system "MAGI", and the average C/E approximately 1.2 was obtained. It was found that the axial neutron intensity didn't simply follow the burnup distribution, and the neutron intensity was locally increased at the bottom end of the fuel region dueto an accumulation of ~244Cm.