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08RTS03 Initiation and Propagation of Stress Corrosion Cracking of Stainless Steel Canister for Concrete Cask Storage of Spent Fuel

Product Number: 51300-08RTS03-SG
ISBN: 08RTS03 2008 CP
Author: Jun-ichi Tani, Masami Mayuzumi, and Nobuyoshi Hara
Publication Date: 2008
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Resistance to atmospheric stress corrosion cracking (ESCC) and crevice corrosion was examined for various candidate canister materials in the spent fuel dry storage condition using concrete casks. A constant load ESCC test was conducted on the candidate materials in air after deposition of simulated sea salt particles on the specimen gage section. UNS S31260 and S31254, highly corrosion resistant stainless steels (SS), did not fail for more than 46,000 h at 353 K with relative humidity of 35 %, although S30403 SS and S31603 failed around 500 h by ESCC. Crack growth measurement was done to explain this result. Cracking on S31603 propagated around 3x10-10 m·s-1 at K values larger than 10MPa·m0.5 at 353K with RH=35%. S31260 SS showed crack growth rate of 4x10-13m·s-1 at the same condition.
Resistance to atmospheric stress corrosion cracking (ESCC) and crevice corrosion was examined for various candidate canister materials in the spent fuel dry storage condition using concrete casks. A constant load ESCC test was conducted on the candidate materials in air after deposition of simulated sea salt particles on the specimen gage section. UNS S31260 and S31254, highly corrosion resistant stainless steels (SS), did not fail for more than 46,000 h at 353 K with relative humidity of 35 %, although S30403 SS and S31603 failed around 500 h by ESCC. Crack growth measurement was done to explain this result. Cracking on S31603 propagated around 3x10-10 m·s-1 at K values larger than 10MPa·m0.5 at 353K with RH=35%. S31260 SS showed crack growth rate of 4x10-13m·s-1 at the same condition.
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