Abstract
The LAHET code system is used to study the behaviour of the spallation neutrons resulting from the interaction of 2.5GeV/c protons with a massive lead target within a large (∼32m3) lead and graphite moderating environments. The spatial and energy distribution of the neutrons with presence and absence of a fissile material in Accelerator Driven Systems (ADS) are investigated.It is shown that the energy spectra of the neutrons in graphite and lead moderators are very different and such difference is expected to result in noticeable differences in the nuclear waste transmutation abilities of the ADSs that use graphite and lead for neutron moderation and storage.
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