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Results of metallographic analysis of the QUENCH-20 bundle with B₄C absorber

Stuckert, Juri ORCID iD icon 1; Peters, U. 1; Stegmaier, Ulrike 1; Steinbrück, Martin ORCID iD icon 1
1 Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Experiment QUENCH-20 with BWR geometry simulation bundle was conducted at KIT on 9th October 2019 in the framework of the international SAFEST project. The test bundle mock-up represented one quarter of a BWR fuel assembly with 24 electrically heated fuel rod simulators and two B4C control blades. The rod simulators were filled with Kr to inner pressure of 5.5 bar at peak cladding temperature of 900 K. The pre-oxidation stage in the flowing gas mixture of steam and argon (each 3 g/s) and system pressure of 2 bar lasted 4 hours at the peak cladding temperature of 1250 K. During the following transient stage, the bundle was heated to a maximal temperature of 2000 K. The cladding radial extensions and failures due to inner overpressure (about 4 bar) were observed at temperature about 1700 K and lasted about 200 s. During the period of rod failures also the first absorber melt relocation accompanied by shroud failure were registered. The interaction of B4C with steel blade and ZIRLO channel box was observed at elevations 650…950 mm with formation of eutectic melt. The typical components of this melt are (Fe, Cr) borides and ZrB2 precipitated in steel or in Zr-steel eutectic melt. ... mehr


Volltext §
DOI: 10.5445/IR/1000151589
Veröffentlicht am 18.10.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Vortrag
Publikationsdatum 18.05.2022
Sprache Englisch
Identifikator KITopen-ID: 1000151589
HGF-Programm 32.12.02 (POF IV, LK 01) Beyond Design Basis and Emergency Management
Veranstaltung 10th European Review Meeting on Severe Accident Research (ERMSAR 2022), Karlsruhe, Deutschland, 16.05.2022 – 19.05.2022
Schlagwörter BWR test bundle, cladding oxidation, eutectic melt relocation, reflood, temperature escalation
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