Evaluation of displacement cross-section for neutron-irradiated 15-15Ti steel and its swelling behavior in CiADS radiation environment

Highlights: • Method to calculate displacement cross-section in NRT and arc-dpa models. • Calculation of displacement cross-section for several steels used worldwide. • Evaluation of 15-15Ti steel failure lifetime due to swelling in CiADS core. - Abstract: We report on the proposed method of evaluating the displacement cross-sections in NRT and BCA-arc-dpa models. The method is based on the NJOY code in conjunction with the IOTA code and is applicable to neutron energy in the range of 0.1 neV–20 MeV, defined by using NJOY and nuclear library files with data up to 20 MeV. The displacement cross-section has been calculated for natural iron, 15-15Ti, 316L, Eurofer, ODS, and T91 steels. The displacement cross-sections for 15-15Ti steel were used to estimate radiation damage and swelling level under irradiation conditions of the China Initiative Accelerator Driven System (CiADS) subcritical core. The swelling analysis has shown, that in CiADS radiation environment, the 15-15Ti steel has a good margin to cladding failure due to swelling and, therefore, might be a cladding material for CiADS.