Sensitivity to chemical composition variations and heating/oxidation mode of the breakaway oxidation in M5® cladding steam oxidized at 1000°C (LOCA conditions) - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2012

Sensitivity to chemical composition variations and heating/oxidation mode of the breakaway oxidation in M5® cladding steam oxidized at 1000°C (LOCA conditions)

Valérie Vandenberghe
  • Fonction : Auteur
Jean-Christophe Brachet
  • Fonction : Auteur
  • PersonId : 1059906
Didier Gilbon
  • Fonction : Auteur
Jean Paul Mardon
  • Fonction : Auteur
  • PersonId : 940195
B. Sebbari
  • Fonction : Auteur

Résumé

This paper deals with the influences of the chemical composition and the heating/oxidation mode on the breakaway oxidation of M5® cladding steam oxidized at 1000°C (LOss of Coolant Accident conditions). In order to study the sensitivity of the breakaway oxidation to chemical composition variations around the nominal specifications of the M5® alloy, one-side oxidation tests were performed at 1000°C under steam at nearly atmospheric pressur e on samples with various contents of Nb (0.87 and 1.25 wt%), Fe (195 and 715 wt.ppm), O (500, 930 and 1680 wt.ppm), S (14 and 41 wt.ppm) and Hf (62 and 487 wt.ppm). Weight gains and hydrogen contents of the samples were measured after oxidation. It is found that the pre-breakaway oxidation kinetics and the time of occurrence of the breakaway transition are not significantly modified by chemical composition variations for the batches investigated: in all cases, the transition occurs at about 5000s, which corresponds to a weight gain of about 10 mg/cm 2 / one-side-oxidation. However, after the breakaway transition, some differences are observed on weight gains and hydrogen uptakes. Moreover, the influence on the breakaway of both the heating and the oxidation modes were analyzed by comparing results obtained on M5® cladding samples one-side steam oxidized at 1000°C by the use of a resistance heating furnace and double-side steam oxidized by using an induction heating technique. The thicknesses of the oxide and α Zr (O) layers were measured after oxidation. The occurrence of the breakaway oxidation does not appear to be affected by the heating mode and the oxidation type. M5® is a trademark of AREVA NP

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Matériaux
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Dates et versions

hal-04447119 , version 1 (15-02-2024)

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  • HAL Id : hal-04447119 , version 1

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Valérie Vandenberghe, Jean-Christophe Brachet, Matthieu Le Saux, Didier Gilbon, Jean Paul Mardon, et al.. Sensitivity to chemical composition variations and heating/oxidation mode of the breakaway oxidation in M5® cladding steam oxidized at 1000°C (LOCA conditions). TopFuel 2012, Sep 2012, Manchester, United Kingdom. ⟨hal-04447119⟩

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