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Stainless Steels Corrosion in Sodium Fast Reactor: Feedback from Risks during Maintenance Operations (SCC in Caustic Solution and Intergranular Corrosion by Acid Solution)

Jun 28, 2017, 1:50 PM
20m
Room 5 (Yekaterinburg)

Room 5

Yekaterinburg

ORAL Track 5. Fast Reactor Materials (Fuels and Structures) and Technology 5.6 Liquid Metal Technologies

Speaker

Mrs Martine BLAT YRIEIX (EDF R&D MMC)

Description

Stainless steels are widely used in Sodium Fast Reactor and exhibit a very satisfactory feedback regarding their behavior in contact with high purity sodium. The French past experience with Phenix and Superphenix confirmed this trend but it also highlighted that utilities have to take care at material susceptibility to different corrosion mechanisms during maintenance operations: Stress Corrosion Cracking (SCC) induced by caustic solution and Intergranular corrosion induced by acid solution used during maintenance operation. In this paper, more than an overview of these mechanisms, the feedback and lessons learned from Phenix operation and maintenance experience will be presented as well as the present opportunity of materials investigations on components with Phenix dismantling. Finally, the precautions for ASTRID design and future operation will be highlighted.

Country/Int. Organization

France EDF, CEA and Areva NP

Primary author

Mrs Martine BLAT YRIEIX (EDF R&D MMC)

Co-authors

Mrs Agnes LINA (EDF R&D MMC) Dr Frederic DELABROUILLE (EDF R&D MMC) Mr Gerard PRELE (EDF SEPTEN) Dr Jean-Louis COUROUAU (CEA DEN) Dr Laetitia NICOLAS (CEA DEN) Dr Sophie DUBIEZ LE GOFF (Areva NP) Mr Theodore COZZIKA (CEA DEN) Dr Thorsten MARLAUD (Areva NP) Dr Valérie GRABON (Areva NP)

Presentation materials