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Report No.

Out of pile FCCI susceptibility test of super ODS ferritic steel

Otsuka, Satoshi   ; Kaito, Takeji ; Inoue, Masaki ; Okuda, Takanari*; Kimura, Akihiko*; Ukai, Shigeharu*; Onuki, Somei*; Fujisawa, Toshiharu*; Abe, Fujio*

Corrosion-resistant super ODS ferritic steels are being developed for high-burn up fuel cladding material for LBE-cooled fast reactor and SCW-cooled fast reactor. One of the critical tasks is to ensure the resistance to fuel-cladding chemical interaction(FCCI) of the cladding material. JAEA reseraches showed that the volatile elements Cs, Te and I play an important role in FCCI behavior, and that out of pile corrosion test using the CsOH/CsI mixture can provide the similar corrosion morphology to the actual inner face corrosion of spent fuel pin. This study elaluated the effects of diffenrence in Cr and Al concentrations brought on corrosion resistance to Cs and I. The corrosion resistance was improved by either increase of Cr concentration or removal of Al. The increase of Cr concentration is the key to improvement of FCCI resistance and can produce a satisfactory FCCI resistance surpassing SUS316, even if Al is added to the steel.



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