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Influence of a pre-oxide layer on oxygen diffusion and on postquench mechanical properties of Zircaloy-4 after steam oxidation at 900°C


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Guilbert S., Duriez C., Grandjean C., Influence of a pre-oxide layer on oxygen diffusion and on post-quench mechanical properties of Zircaloy-4 after steam oxidation at 900°C, Proceedings of 2010 LWR Fuel Performance/TopFuel/WRFPM, Orlando, Florida, USA, September 26-29, 2010.

Type de document > *Congrès/colloque

Mots clés > accident de perte de réfrigérant primaire (APRP), DIFFOX

Unité de recherche > IRSN/DPAM/SEREM/LE2M

Auteurs > GUILBERT Séverine, DURIEZ Christian, GRANDJEAN Claude

Date de publication > 29/09/2010

Résumé

A parametric study on the influence of a pre-oxide layer on the high temperature steam oxidation behaviour of Zircaloy-4 cladding has been conducted at the Institut de Radioprotection et de Sûreté Nucléaire (IRSN). Zy4 cladding samples were pre-oxidised in pure oxygen to obtain pre-oxide thicknesses ranging from 10 to 70 μm. Samples were oxidised at 900 °C for 6000 s in steam and then were characterised by metallographic examinations, Vickers micro-hardness measurements, Ring Compression Tests, global hydrogen analysis, EPMA oxygen profiling and mapping. All pre-oxidised sample present large hydrogen pickup and high oxygen concentration in the α+β phase. The mechanical behaviour is degraded compared to initially as-received samples whatever the pre-oxide thickness after HT oxidation.