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- W2321879078 abstract "Permeation of hydrogen isotope through a high-temperature alloy as used heat exchanger and reformer tubes is an important problem in the hydrogen production system connected to be the high-temperature engineering test reactor(HTTR). The objective of this test is to investigate a governing process of hydrogen permeation and effective methods of reducing an amount of permeated hydrogen isotope through the tubes. This paper described the governing process of hydrogen permeation in the HTTR hydrogen production system and permeability of hydrogen and deuterium of Hastelloy XR. A diffusion process in a solid metal limited the amount of permeated hydrogen isotope in the HTTR hydrogen production system. An activation energy for hydrogen permeation of Hastelloy XR was almost equal to that of Hastelloy X. It was found that an oxide film produced during 140h heating under helium gas circumference has an effect of reducing the amount of permeated hydrogen isotope. We obtained the permeability of hydrogen and deuterium for Hastelloy XR as follows. Hydrogen: Temperature=570-820°C, Partial pressure=1.06×102-3.95×103PaActivation energy, E 0=67.2±1.2(kJ·mol -1)Pre-exponential factor, F 0=(1.0±0.2)×10-4(cm3(NTP)·cm-1·s-1·Pa-0.5)Deuterium: Temperature=670-820°C, partial pressure: 9.89×102-4.04×103PaActivation energy, E0=76.6±0.5(kJ·mol -1)Pre-exponential factor, F0=(2.5±0.3)×10-4(cm3(NTP)·cm-1·s-1·Pa-0.5)" @default.
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- W2321879078 date "2000-01-01" @default.
- W2321879078 modified "2023-10-04" @default.
- W2321879078 title "Permeability of Hydrogen Isotope through Hastelloy XR in the HTTR Hydrogen Production System." @default.
- W2321879078 doi "https://doi.org/10.3327/jaesj.42.204" @default.
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