Displacement of Atoms in Fusion Neutron Irradiated Fe and W

FLUKA code has been applied to calculate displacement per atom (DPA) distributions in irradiated Fe and W targets by 2.45 MeV and 14 MeV neutrons. The variations in DPA spectra of Fe and W as a function of target radius, depths and neutron energy are explored. It has been found that DPA depends not only on the depths but also on the size of radius of irradiated targets and neutron energy. FLUKA calculations show that DPA for 14 MeV neutrons in Fe for 1 MW/m2 will be 1.49 × 10–7 DPA/s and for full power year (FPY) will be 4.67 DPA/FPY per 1 MW/m2. DPA in W for 14 MeV neutrons for 1 MW/m2 will be 8.62 × 10–8 DPA/s and for DPA/FPY will be equal to 2.73 DPA/FPY per 1 MW/m2, respectively.