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Hafnium Oxidation at High Temperature in Steam

Guilbert-Banti, S.; Viretto, A.; Barrachin, M.; Tanguy, C.; Steinbrück, M.; Stuckert, J.

Abstract (englisch):
To assess the potential impact of using hafnium as absorber material in LWRs in high temperature accidental situations, the oxidation behavior of hafnium was studied up to 1400 °C, i.e. at temperature conditions relevant to severe accidents. Different sample geometries were tested and oxidized in steam/argon mixtures, either in a furnace or in a thermogravimetric analyzer. Metallographic examinations, hydrogen measurements and EPMA oxygen profiles were then performed. For hafnium rods/discs, metallographic examinations showed the presence of a dense and protective oxide film after steam oxidation. No or little hydrogen was detected in the metallic part of the rod/disc specimens. The reaction rate can be described by a parabolic law in the tested temperature range in the mid-to-long term, and the value of the effective activation energy determined from the experimental data in steam is in good agreement with the ones published in the literature. The diffusion coefficient of oxygen in hafnium was estimated at each temperature by fitting the experimental oxygen profile obtained on hafnium rods and its temperature dependence is derived in the temperature range 700-1400 °C. ... mehr



Originalveröffentlichung
DOI: 10.1016/j.jnucmat.2021.152901
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0022-3115
KITopen-ID: 1000130431
HGF-Programm 32.12.02 (POF IV, LK 01) Beyond Design Basis and Emergency Management
Weitere HGF-Programme 32.02.11 (POF III, LK 01) Auslegungsüberschreitende Störfälle
Erschienen in Journal of nuclear materials
Verlag Elsevier
Seiten 152901
Vorab online veröffentlicht am 03.03.2021
Schlagwörter hafnium neutron absorber, severe accident conditions, parabolic oxidation kinetics, single effect and bundle tests, diffusion coefficient of oxygen in hafnium, influence of surface treatment and iron content
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