The reduced activation ferritc martensitic steel EUROFER is one of the foreseen structural materials for future fusion reactors. The exposure to energetic fusion neutrons will generate displacement damage in the steel which acts as trapping sites for hydrogen isotopes (HIs). For predictive simulations of HI retention the concentration of the trap sites and HI trap-binding energies are needed. In this work the potential influence of HIs present during displacement damage on the resulting trap site concentration is investigated. The results suggest that the presence of D and He in EUROFER will result in increased retention compared to pure EUROFER under displacement damage
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