Isotope Effect in the Interaction between Hydrogen and Fusion Reactor Materials

A summary is presented of results from studying the transport characteristics of hydrogen isotopes in a number of fusion reactor materials as ferritic–martensitic steels, austenitic steels, and CuCrZr–bronze. The parameters of tritium transport in the materials are obtained using experimentally measured parameters of hydrogen and deuterium transport within the classical rate theory. The applicability of this approach is discussed. It is shown that a considerable part of the experimental data is inconsistent with assumptions based on the classical theory. Other approaches are required to accurately predict tritium fluxes through fusion reactor materials.