首页|Kinetics and transport of hydrogen in graphite at high temperature and the effects of oxidation, irradiation and isotopics
Kinetics and transport of hydrogen in graphite at high temperature and the effects of oxidation, irradiation and isotopics
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NSTL
Elsevier
The kinetics of uptake and desorption impact the performance of graphite as a vector for tritium in high-temperature fission reactors and in the blanket of fusion reactors. Graphite components in these reactors are exposed to temperatures > 500 °C and H2 partial pressures of few Pa and desorption temperatures are limited to < 1600 °C; limited data is available at these conditions. We review the mechanisms for uptake in, transport and desorption of hydrogen from graphite at high temperature, compiling data on uptake rates, diffusion coefficients and activation energies and providing a discussion of the impact of irradiation, pre-oxidation and isotope. At FHR conditions, trapping impacts uptake rates, leading to a reduction in apparent diffusivity by 35 to 80% compared to higher partial-pressure uptake. Timelines for desorption are not clearly defined; extrapolating from available data, at 1150 °C desorbing 80% of tritium uptaken at FHR conditions may take from 100 to 10,000 h.
Graphite matrix and nuclear graphiteHydrogen absorption kineticsHydrogen thermal desorptionMolten saltMSR and FHRTritium management
NSTL
Elsevier
