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Experimental program QUENCH at KIT on core degradation during reflooding under LOCA conditions and in the early phase of a severe accident

Stuckert, Juri ORCID iD icon; Steinbrueck, Martin ORCID iD icon; Grosse, Mirco

Abstract (englisch):

The most important accident management measure to terminate a severe accident transient in LWR is the injection of water to cool the uncovered degraded core. In order to detailed investigation of the reflood effect on bundle degradation the QUENCH program was initiated in 1996 followed-up the CORA bundle tests and is still on-going. So far, 17 integral bundle QUENCH experiments with 21–31 electrically heated fuel rod simulators of 2.5 m length using zirconia as fuel substitute have been conducted. Influence of following parameters on bundle degradation were investigated: degree of pre-oxidation, temperature at reflood initiation, flooding rate, effect of neutron absorber materials (B4C, Ag-In-Cd), air ingress, influence of the type of cladding alloy, formation of a debris bed in the core. Integral bundle experiments are supported by separate-effects tests. The program provides experimental data for the development of quench-related models and for the validation of SFD code systems. In seven tests, reflooding of the bundle led to a temporary temperature excursion. Considerable formation, relocation, and oxidation of melt were observed in all tests with escalation. ... mehr

Postprint §
DOI: 10.5445/IR/1000078815
Veröffentlicht am 14.02.2018
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Proceedingsbeitrag
Publikationsmonat/-jahr 11.2015
Sprache Englisch
Identifikator ISBN: 978-92-0-158615-5
ISSN: 1684–2073
KITopen-ID: 1000078815
HGF-Programm 32.02.11 (POF III, LK 01) Auslegungsüberschreitende Störfälle
Erschienen in "Modelling of Water Cooled Fuel Including Design Basis and Severe Accidents", Chengdu, China, 28 October–1 November 2013
Verlag IAEA
Seiten 281-297
Vorab online veröffentlicht am 01.11.2015
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