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Effect of steam and oxygen starvation on severe accident progression with air ingress

Farkas, Róbert ; Hózer, Zoltán; Nagy, Imre; Vér, Nóra; Horváth, Márta; Steinbrück, Martin ORCID iD icon 1; Stuckert, Juri ORCID iD icon 1; Grosse, Mirco 1
1 Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The CODEX-AIT-3 experiment simulated an in-vessel air ingress scenario after failure of bottom head of a nuclear reactor. 1600 °C maximum temperature was reached with the electrically heated bundle and slow cool-down was applied at the end of the test to demonstrate the bundle state before quench. Limited air and steam flow rates were intentionally selected in order to slow down the high temperature chemical interactions and provided unique data on nuclear fuel behaviour under oxygen and steam starvation conditions. The individual oxidation and nitriding phenomena were well separated from each other and it was indicated by the complex microstructures in the zirconium cladding with nitrides, oxides and transition zones. The competition between different chemical reactions could be excluded in some locations and some time periods. The post-test numerical analyses of the experiment could be used for the evaluation of the role of numerical models developed for individual chemical reactions in severe accident codes.


Postprint §
DOI: 10.5445/IR/1000148900
Veröffentlicht am 21.07.2023
Originalveröffentlichung
DOI: 10.1016/j.nucengdes.2022.111884
Scopus
Zitationen: 3
Web of Science
Zitationen: 4
Dimensions
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2022
Sprache Englisch
Identifikator ISSN: 0029-5493
KITopen-ID: 1000148900
HGF-Programm 32.12.02 (POF IV, LK 01) Beyond Design Basis and Emergency Management
Erschienen in Nuclear Engineering and Design
Verlag Elsevier
Band 396
Seiten 111884
Vorab online veröffentlicht am 20.07.2022
Schlagwörter Severe accident test, Core degradation, Air ingress
Nachgewiesen in Dimensions
Scopus
Web of Science
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