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Application of a newly developed computer code model for nitriding and re-oxidation of cladding materials on separate effect tests and integral experiments [in press]

Jäckel, B.S.; Lind, T.; Fernandez-Moguel, L.; Steinbrück, M.; Park, S.

Abstract (englisch):
In the last 10 years large-scale experiments and separate effect tests have shown the potential of cladding destruction during oxidant starvation by formation of zirconium nitride (ZrN) in presence of air or nitrogen which is used as "inert" gas in boiling water reactor containments. This reaction plays an important role during loss of cooland accidents in spent fuel pools. PSI and KIT have started a project to develop a standalone computer model to calculate the behavior of the cladding material under different concentrations of oxygen and nitrogen. More than 70 separate effect tests were used to define the temperature dependent reaction rates for the pre-oxidation phase, the annealing phase, the nitriding phase and the re-oxidation phase. The later one has to be separated into oxidation of
ZrN and oxidation of the remaining metal. The model distinguishes also between two regimes, the breakaway regime at temperatures below 1050°C and the non-break-away regime above 1050°C. In the high temperature region, the acceleration of the oxidation results from the morphology change due to the nitriding reaction (porous structure of re-oxidized ZrN).
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Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2019
Sprache Englisch
Identifikator ISBN: 978-80-270-5809-9
KITopen-ID: 1000100322
HGF-Programm 32.02.11 (POF III, LK 01) Auslegungsüberschreitende Störfälle
Erschienen in 9th Conference on severe accident research - ERMSAR 2019, march 18 - 20, 2019 - Prague, Czech Republic
Seiten 196/1-14
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