Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
SCC Susceptibility of High Corrosion Resistant Stainless Steels for Spent Fuel Storage Canister Materials Exposed at Hot Wet Air with Dripped Synthetic Sea Salt
Hitomi ItohKazunari OnishiMasayuki OkunishiKenichi MatsunagaKazuo Murakami
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2005 Volume 54 Issue 1 Pages 25-30

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Abstract

A canister for a concrete cask in the spent fuel facilities will be exposed at the wet environment with deposited sea salt particles after long term storage periods. High corrosion resistant stainless steels, dual phase stainless steel (material D) and austenitic super stainless steel (material A), were selected for candidate materials of the canister, for the wide and 20 to 50mm thick hot rolled plates are able to produce from those alloys by the recent hot rolling technology. Then constant load stress corrosion cracking tests for both materials were conducted by Mayuzumi et al. for up to 16000 hours in the hot wet environments to confirm no failure in this period, however several penetrations are observed on the both surfaces of specimens. In order to evaluate the corrosion resistance of those materials, the penetrations of above mentioned specimens which authors were given from them are examined to obtain the base data of stress corrosion crack initiation and propagation. The following conclusions were obtained.
1) The micro stress corrosion cracks are observed only at the 80°C test specimens, although only penetrations were observed on the specimens tested at 70°C and 80°C. Crack initiates at the stress of larger than 1.1σy after approximately 15000 hours of test for material D, and at the stress 1.5σy and after approximately 1000 hours for material A.
2) SCC propagation rates of both materials are very slow.
3) The critical value of SCC initiation (KI SCC) are about 7MPa√m for material D and 5MPa√m for material A, respectively, in this investigation.

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© Japan Society of Corrosion Engineering
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