MozartV1, Main, Exploration, bibRecord, 000F63

Separate-effect tests on zirconium cladding degradation in air ingress situations

Identifieur interne : 000F63 ( Main/Exploration ); précédent : 000F62; suivant : 000F64

Separate-effect tests on zirconium cladding degradation in air ingress situations

Auteurs : C. Duriez [France] ; M. Steinbrück [Allemagne] ; D. Ohai [Roumanie] ; T. Meleg [Roumanie] ; J. Birchley [Suisse] ; T. Haste [Suisse]

Source :

Nuclear engineering and design [ 0029-5493 ] ; 2009.

RBID : Pascal:09-0098245

Descripteurs français

Pascal (Inist)
- Zirconium alliage, Gaine (combustible), Réacteur nucléaire, Combustible irradié, Probabilité, Accident, Barre combustible, Haute température, Vapeur eau, Oxydation, Nitrure, Azote, Zircaloy, Réacteur eau pressurisée, Réacteur modéré eau, Réacteur eau lourde, Tube, Thermogravimétrie, Spectrométrie masse, Inspection, Oxyde, Modélisation, Dispositif CANDU.
Wicri :
- topic : Réacteur nucléaire, Combustible irradié, Azote, Tube, Oxyde.

English descriptors

KwdEn :
- Accident, Clad, Fuel rod, Heavy water reactor, High temperature, Inspection, Irradiated nuclear fuel, Mass spectrometry, Modeling, Nitrides, Nitrogen, Nuclear reactor, Oxidation, Oxides, Pressurized water reactor, Probability, Thermogravimetry, Tube, Water moderated reactor, Water vapor, Zircaloy, Zirconium alloy.

Abstract

In the event of air ingress during a reactor or spent fuel pond low probability accident, the fuel rods will be exposed to air-containing atmospheres at high temperatures. In comparison with steam, the presence of air is expected to result in a more rapid escalation of the accident. A state-of-the-art review performed before SARNET started showed that the existing data on zirconium alloy oxidation in air were scarce. Moreover, the exact role of zirconium nitride on the cladding degradation process was poorly understood. Regarding the cladding behaviour in air+steam or nitrogen-enriched atmospheres (encountered in oxygen-starved conditions), almost no data were available. New experimental programmes comprising small-scale tests have therefore been launched at FZK,IRSN (MOZART programme in the frame of the International Source Term Program-ISTP) and INR. Zircaloy-4 cladding in PWR (FZK, IRSN) and in CANDU (INR) geometry are investigated. On-line kinetic data are obtained on centimetre size tube segments, by thermogravimetry (FZK, IRSN and INR) or by mass spectrometry (FZK). Plugged tubes 15 cm long (FZK) are also investigated. The samples are air-oxidised either in the "as-received" state, or after pre-oxidation in steam. "Analytical" tests at constant temperature and gas composition provide basic kinetic data, while more prototypical temperature transients and sequential gas compositions are also investigated. The temperature domains extend from 600 °C up to 1500 °C. Systematic post-test metallographic inspections are performed. The paper gives a synthesis of the results obtained, comparing them in terms of kinetics and oxide scale structure and composition. A comparative analysis is performed with results of the QUENCH-10 (Q-10) bundle test, which included an air ingress phase. It is shown how the data contribute to a better understanding of the cladding degradation process, especially regarding the role of nitrogen. For modelling of the oxide scale degradation under air exposure, important features that have to be taken into account are highlighted.

Affiliations:

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Le document en format XML

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<term>High temperature</term>
<term>Inspection</term>
<term>Irradiated nuclear fuel</term>
<term>Mass spectrometry</term>
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<term>Nuclear reactor</term>
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<term>Réacteur nucléaire</term>
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<term>Probabilité</term>
<term>Accident</term>
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<front><div type="abstract" xml:lang="en">In the event of air ingress during a reactor or spent fuel pond low probability accident, the fuel rods will be exposed to air-containing atmospheres at high temperatures. In comparison with steam, the presence of air is expected to result in a more rapid escalation of the accident. A state-of-the-art review performed before SARNET started showed that the existing data on zirconium alloy oxidation in air were scarce. Moreover, the exact role of zirconium nitride on the cladding degradation process was poorly understood. Regarding the cladding behaviour in air+steam or nitrogen-enriched atmospheres (encountered in oxygen-starved conditions), almost no data were available. New experimental programmes comprising small-scale tests have therefore been launched at FZK,IRSN (MOZART programme in the frame of the International Source Term Program-ISTP) and INR. Zircaloy-4 cladding in PWR (FZK, IRSN) and in CANDU (INR) geometry are investigated. On-line kinetic data are obtained on centimetre size tube segments, by thermogravimetry (FZK, IRSN and INR) or by mass spectrometry (FZK). Plugged tubes 15 cm long (FZK) are also investigated. The samples are air-oxidised either in the "as-received" state, or after pre-oxidation in steam. "Analytical" tests at constant temperature and gas composition provide basic kinetic data, while more prototypical temperature transients and sequential gas compositions are also investigated. The temperature domains extend from 600 °C up to 1500 °C. Systematic post-test metallographic inspections are performed. The paper gives a synthesis of the results obtained, comparing them in terms of kinetics and oxide scale structure and composition. A comparative analysis is performed with results of the QUENCH-10 (Q-10) bundle test, which included an air ingress phase. It is shown how the data contribute to a better understanding of the cladding degradation process, especially regarding the role of nitrogen. For modelling of the oxide scale degradation under air exposure, important features that have to be taken into account are highlighted.</div>
</front>
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Separate-effect tests on zirconium cladding degradation in air ingress situations

Separate-effect tests on zirconium cladding degradation in air ingress situations

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri