Linking Lattice Strain and Fractal Dimensions to Non‐monotonic Volume Changes in Irradiated Nuclear Graphite

Author(s)
Sprouster, David J; Fayfar, Sean; Rai, Durgesh K; Campbell, Anne; Ilavsky, Jan; ... Show more
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Abstract
Graphite's resilience to high temperatures and neutron damage makes it vital for nuclear reactors, yet irradiation alters its microstructure, degrading key properties. We used small- and wide-angle X-ray scattering to study neutron-irradiated fine-grain nuclear graphite (Grade G347A) across varied temperatures and fluences. Results show significant shifts in internal strain and porosity, correlating with radiation-induced volume changes. Notably, porosity volume distribution (fractal dimensions) follows non-monotonic volume changes, suggesting a link to the Weibull distribution of fracture stress.
Date issued
2025-08-12
URI
https://hdl.handle.net/1721.1/163202
Department
MIT Nuclear Reactor Laboratory
Journal
Interdisciplinary Materials
Publisher
Wiley
Citation
Sprouster, D.J., Fayfar, S., Rai, D.K., Campbell, A., Ilavsky, J., Snead, L.L. and Khaykovich, B. (2025), Linking Lattice Strain and Fractal Dimensions to Non-monotonic Volume Changes in Irradiated Nuclear Graphite. Interdisciplinary Materials, 4: 714-718.
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