Comparison of PKA Energy Spectra, Gas-Atom Production and Damage Energy Deposition in Neutron Irradiation at Various Facilities

By dividing neutron-energy spectrum into four energy groups, (I) < 10 eV, (II) 10 eV to 0.1 MeV, (III) 0.1-10 MeV and (IV) > 10 MeV, contributions to damage parameters (PKA spectrum, damage energy and gas-atom production) from each of the energy group were caculated for neutron irradiations at various facilities with the SPECTER code developed by Greenwood and Smither. The normalized PKA spectra and the gas-atom productions were compared to examine differences in damage parameters. Such comparisons were carried out among (I) irradiations various positions in different fission reactors (i.e. KUR, JOYO and FFTF-MOTA), and among (2) those at various fission reactors. Damage parameters were also calculated at STARFIRE fusion reactor and RTNS-II. A possible method to correlate damages at different fission reactors is discussed. It is suggested that damages in fusion reactor can be simulated by the superposition of irradiations with fission and D--T neutrons. Neutron irradiations of Fe, Cu and Ni are included. Graphs. 5 ref.--AA