  A possibility of synthesizing neutron-reach super-heavy elements in
spallation targets of Accelerator Driven Systems (ADS) is considered. A
dedicated software called Nuclide Composition Dynamics (NuCoD) was developed to
model the evolution of isotope composition in the targets during a long-time
irradiation by intense proton and deuteron beams. Simulation results show that
transuranic elements up to Bk-249 can be produced in multiple neutron capture
reactions in macroscopic quantities. However, the neutron flux achievable in a
spallation target is still insufficient to overcome the so-called fermium gap.
Further optimization of the target design, in particular, by including
moderating material and covering it by a reflector will turn ADS into an
alternative source of transuranic elements in addition to nuclear fission
reactors.
