Surface and in-depth structural changes in nuclear graphite irradiated with noble gases described with Raman imaging

4th Generation high-temperature gas-cooled nuclear reactors (HTGR) are regarded as possible sources of industrial heat in Poland and Europe, allowing for a substantial reduction of the dependency on gas and coal import. It is mainly due to their safety of use, reliability and economy in a current en...

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Bibliographic Details
Published in:arXiv.org 2023-04
Main Authors: Gawęda, Magdalena, Wilczopolska, Magdalena, Suchorab, Kinga, Frelek-Kozak, Małgorzata, Kurpaska, Łukasz, Jagielski, Jacek
Format: Article
Language:English
Subjects:
Argon ions
Construction materials
Crystal defects
Crystallites
Damage assessment
Evolution
Graphite
Helium
High temperature gases
Ion irradiation
Nuclear reactors
Nuclear safety
Radiation damage
Rare gases
Structural damage
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Summary:4th Generation high-temperature gas-cooled nuclear reactors (HTGR) are regarded as possible sources of industrial heat in Poland and Europe, allowing for a substantial reduction of the dependency on gas and coal import. It is mainly due to their safety of use, reliability and economy in a current energetic crisis. In this work, graphite, as a primary construction material and neutron moderator in HTGR, was evaluated before and after ion irradiation since its properties depend on the material's structure and purity. Commercial graphite materials (IG-110, NBG-17) and the laboratory's in-home material were chosen for the exemplary samples. The structural damage in HTGR was simulated with energetic Ar+ and He+ ions with fluencies from 1E12 to 2E17 ion/cm2. Raman imaging was chosen to assess radiation damage build-up: the crystallites' evolution, occurrence and types of defects. The recorded evolution showed stronger disordering of the material with heavier Ar+ ions than with He+.
ISSN:2331-8422
DOI:10.48550/arxiv.2304.10120