Permeability of hydrogen and deuterium of Hastelloy XR

Permeation of hydrogen isotope through a high-temperature alloy used as heat exchanger and steam reformer pipes is an important problem in the hydrogen production system connected to be a high-temperature engineering test reactor (HTTR). An experiment of hydrogen (H2) and deuterium (D2) permeation was performed to obtain permeability of H2 and D2 of Hastelloy XR, which is adopted as heat transfer pipe of an intermediate heat exchanger of the HTTR. Permeability of H2 and D2 of Hastelloy XR were obtained as follows. The activation energy E0 and pre-exponential factor F0 of the permeability of H2 were E0=67.2±1.2 kJ mol−1 and F0=(1.0±0.2)×10−8 m3(STP) m−1 s−1 Pa−0.5, respectively, in the pipe temperature ranging from 843 K (570 °C) to 1093 K (820 °C). E0 and F0 of the permeability of D2 were respectively E0=76.6±0.5 kJ mol−1 and F0=(2.5±0.3)×10−8 m3(STP) m−1 s−1 Pa−0.5 in the pipe temperature ranging from 943 K (670 °C) to 1093 K (820 °C).