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Pre- and Post-Test Simulations of the QUENCH-18 Bundle Experiment in the frame of the NUGENIA QUESA Project

Hollands, T.; Bals, C.; Tiborcz, L.; Beuzet, E.; Vasiliev, A.; Kaliatka, T.; Birchley, J.; Steinbrück, M.; Stuckert, J.

Abstract (englisch):
Air ingress into the reactor pressure vessel during a severe accident in a nuclear power plant will lead to a mixed atmosphere mainly consisting of air and steam. Due to the strongly oxidizing character of air this mixed atmosphere leads to an enhanced core oxidation and degradation which affects the fission product release from the core to the primary circuit and subsequently to the containment in case of leaks or through relief valves. Several fission products are of high importance because of their high radiotoxicity and their ability to form highly volatile oxides. It is therefore important to understand the phenomena governing cladding oxidation by air as a prerequisite for source term determination. For investigating the oxidation behaviour under mixed air/steam atmospheres two experiments were conducted in the frame of two EU funded projects, QUENCH-18 (ALISA project) and CODEX-AIT3 (SAFEST project).
For both tests, pre- and post-test simulations were done in the frame of the NUGENIA project QUESA (QUEnch experiment with Steam and Air). This paper deals with the analyses for QUENCH-18 conducted at KIT in 2017. The pre-test benchmark was performed by five participants (EDF, GRS, IBRAE, LEI, and formerly of PSI) using four codes (MAAP, ATHLET-CD of AC2, SOCRAT, twice RELAP/SCDAPSIM) to identify suitable boundary conditions for achieving the targets of the tests, which should consist of the following phases: pre-oxidation, intermediate cooldown, air/steam ingress phase and finally cooldown by water. ... mehr

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Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Proceedingsbeitrag
Jahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000093949
HGF-Programm 32.02.11 (POF III, LK 01)
Erschienen in The 9TH European Review Meeting on Severe Accident Research (ERMSAR2019), Czech Republic, March 18-20, 2019
Veranstaltung 9th European Review Meeting on Severe Accident Research (ERMSAR 2019), Prag, Tschechien, 18.03.2019 – 20.03.2019
Seiten Paper 76
Schlagworte QUENCH-18, Air Ingress, Severe Accidents, Benchmarks, Code Evaluation
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