Speaker
Description
Iron, chromium and tungsten are going to be used in upcoming fusion reactors at many places such as divertor, blanket and shield modules. DT neutron spectrum cause transmutation, gas production and displacement damage in these materials and adversely affect their strength and lifetime. In the present work, transmutation, gas production (GPA) and displacement damage (dpa) have been studied for all the stable isotopes of iron, chromium and tungsten for neutron irradiation of up to 15 MeV energy. Nuclear reaction cross section for transmutation, and gas production and energy differential cross section of recoil species for displacement damage from all the open reaction channels have been calculated with TALYS-1.8 code. Nuclear models in TALYS-1.8 code have been selected based on the comparison of calculated reaction cross section and energy spectrum of outgoing particles with the existing experimental data from EXFOR data library. Damage matrices which are required to calculate the displacement damage cross section have been calculated with NRT and Arc-dpa method. Constant parameters of arc-dpa have been derived with the result of molecular dynamics (MD) simulation of damage cascade carried out with LAMMPS code. MD simulations of displacement damage have been carried out for the native/self PKA in iron, chromium and tungsten at up to 200 KeV damage energies. Gas production and displacement cross section have been calculated at up to 15 MeV neutron energy and used to calculate the dpa and GPA in tungsten for ITER and EU Demo neutron spectrum. Values of GPA comes out to be 14.2 appm/FPY (helium production) and 56.8 appm/FPY (Hydrogen production) for ITER neutron spectrum and 37.3 appm/FPY (helium production) and 56.8 appm/FPY (Hydrogen production) for European demo neutron spectrum respectively at the first wall. Similarly, dpa values come out to be 3.3 dpa/FPY and 8.6 dpa/FPY for the ITER and EU demo neutron spectrum at first wall. Similar calculation of GPA and dpa along with the study of transmutation have been carried out for iron and chromium.
| Topic | Applications |
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