Damage analysis in PFC materials from the D-T nuclear fusion reaction

The interactions of fusion reaction products such as 2.45 MeV and 14.06 MeV neutrons and 3.05 MeV protons with PFC(plasma facing component) are analyzed using Monte Carlo codes. The dpa(displacement per atom) values in the three-layered PFC of graphite, Cu, and SS316L are calculated and the depth profile was analyzed for different-type secondary particles. The PHITS and MCNPX code were used for this study. The products of hydrogen, helium gas were also calculated for analysis of nuclear damage effect. The serious irradiation condition of the ITER parameter, a neutron flux of 3.5×10¹³ neutrons/cm²·sec, was applied. The dpa values during one year operation were estimated as 0.40-0.75 dpa for graphite, 2.43-4.57 dpa for Cu and 1.78-2.69 dpa for SS316L. The production rate of H, He atom for SS316L is estimated to 316 appm, 42 appm, respectively.