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Preliminary interpretative analysis of the QUENCH-18 bundle test using SCDAPSim/mod3.5

Birchley, Jonathan C.; Stuckert, J.; Steinbrueck, M.; Grosse, M.

Abstract (englisch):
A preliminary analysis of the bundle reflood experiment QUENCH-18 is performed with the SCDAPSim/Mod3.5/da code containing the PSI-developed model for oxidation in the presence of air. The simulation follows on from pre-test planning and prediction calculations using the same code and input model. The starting point for the post-test calculations differs from the pre-test only in respect of using the actual boundary conditions.

Comparison with measured data enables several aspects of the experiment to be studied. Various treatments of steam and air oxidation kinetics investigate the effect of nitrogen on the oxidation and its continuing influence when air is no longer present. Concerning degradation, different assumptions on failure of the oxide crust indicate how the exposure of relocated metallic melt can enhance the oxidation excursion during reflood. Some modelling and knowledge limitations are identified, particularly regarding oxidation in steam-air mixtures, the roles of nitrogen and zirconium nitride as chemically active species.

Several observed features of the facility operation remain unresolved. Simulations suggest that damage to the shroud affected the reflood progression. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2019
Sprache Englisch
Identifikator ISSN: 0306-4549
KITopen-ID: 1000091374
HGF-Programm 32.02.11 (POF III, LK 01) Auslegungsüberschreitende Störfälle
Erschienen in Annals of nuclear energy
Verlag Elsevier
Band 130
Seiten 20–33
Schlagwörter Severe accident; SCDAPsim; Air/steam mixture; Nitrogen; Oxidation kinetics; Reflood
Nachgewiesen in Scopus
Web of Science
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