Measurement of Helium and Xenon Knudsen permeability in graphite IG-11

Seelig, John-David; Wilson, Jason; Walton, Kyle L.; Ghosh, Tushar K.; Tompson, Robert V.; Loyalka, Sudarshan K.

doi:10.1016/j.jnucmat.2022.154059

Measurement of Helium and Xenon Knudsen permeability in graphite IG-11

Journal Article · Tue Sep 27 00:00:00 EDT 2022 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2022.154059· OSTI ID:2424522

^[1]; Wilson, Jason ^[1]; ^[1]; Ghosh, Tushar K. ^[1]; ^[1]; ^[1]

University of Missouri, Columbia, MO (United States)

Here, understanding the flow and diffusion (transport) of gases through nuclear graphite is of interest in both the prismatic and pebble bed high-temperature gas reactors (HTGRs), for normal operation and under accident conditions, for example, as related to graphite oxidation. Both the laminar and turbulent gaseous transport are of interest. It has also been noted that nuclear graphite can have pore sizes that can possibly lead to non-continuum transport, as the pore size can be comparable to the gaseous mean free path. We report measurements and analyzes of experiments performed with IG-11 graphite in the pressure range of 10 Pa to 14,700 Pa, 293 K, using Helium, and research grade xenon (99.999%), respectively. These values are in fair agreement with those reported for different graphites and gases by other investigators, but are also higher by six orders of magnitude than those reported for Kr permeability in a developmental very low permeability graphite-HXT-90. Our measured ratio of the Helium and Xenon permeabilities is about 4, different from $$\sqrt{\frac{m_{Xe}}{m_{He}}}$$ ≈ 5.72 that corresponds to diffuse reflection at the graphite surface for both gases. Simple analysis indicates that the two gases have slightly different accommodation coefficients (about 25%) with the graphite surface. However, there could also be other reasons, such as experimental uncertainties or the need for a more detailed analysis.

View Accepted Manuscript (DOE)

Research Organization:: University of Missouri, Columbia, MO (United States)

Sponsoring Organization:: USDOE

OSTI ID:: 2424522

Alternate ID(s):: OSTI ID: 1891183

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 572; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Graphite permeability
Helium transport
Knudsen permeability
Materials Science
Nuclear Science & Technology
Xenon transport

Measurement of Helium and Xenon Knudsen permeability in graphite IG-11

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