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Lessons learned from the QUENCH-LOCA experiments at KIT

Stuckert, Juri ORCID iD icon

Abstract (englisch):

First, an overview of LOCA tests performed at KIT during several decades in the facilities TUBA, FABIOLA, FR2, and REBEKA is given.
The results of the QUENCH-LOCA program performed at KIT between 2010 and 2016 are described in details. In the framework of this program, seven bundle tests with different cladding materials (Zry-4, M5®, opt. ZIRLO™) were performed according to a temperature/time-scenario typical for a LBLOCA in a German PWR. For two tests (QUENCH-L4 and -L5) pre-hydrogenated claddings (with 100 and 300 wppm H for M5® and Opt. ZIRLO™, correspondingly) were used. Generally, a peak cladding temperature of about 1080 °C was reached at the end of the heat-up phase at the bundle elevation of 950 mm. The maximal heat-up rate was 8 K/s; the cooling phase lasted about 120 s (0 s for QUENCH-L0) and was terminated by 3.3 g/s/effective rod water flooding. The tangential temperature gradient across a rod was between 30 and 70 K on the burst onset (important parameter for ballooning size, accordingly to the REBEKA criterion).
The profilometry of the whole length of the rods showed formation of not only main ballooning area (with burst) but also, for several rods of each bundle, additional two or three ballooning regions. ... mehr


Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Vortrag
Publikationsdatum 13.03.2019
Sprache Englisch
Identifikator KITopen-ID: 1000095939
HGF-Programm 32.02.11 (POF III, LK 01) Auslegungsüberschreitende Störfälle
Veranstaltung 23rd International Seminar ZIRAT on Zirconium Alloy Technology (2019), Palma de Mallorca, Spanien, 11.03.2019 – 13.03.2019
Schlagwörter design basis accident, ballooning, burst, secondary hydriding, LOCA criteria
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