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Monday, March 17, 2008 - 10:35 AM
Convention Center, Second Level, 220 (Ernest N. Morial Convention Center)
Initiation and Propagation of Stress Corrosion Cracking of Stainless Steel Canister for Concrete Cask Storage of Spent Fuel
Resistance to atmospheric stress corrosion cracking (ESCC) and crevice corrosion was examined for various candidate canister materials for spent fuel dry storage in concrete casks. Constant load ESCC tests were conducted on the candidate materials in air after deposition of simulated sea salt particles on the specimen gage section. UNS S31260 and S31254 did not fail in more than 46,000 h at 353 K and 35% relative humidity, although S30403 and S31603 failed around 500 h by ESCC. Cracking on S31603 propagated around 3x10-10 m·s-1 at K values larger than 10MPa·m0.5 at 353K with RH=35%. S31620 SS showed crack growth rate of 4x10-13 m·s-1 at the same condition. Crevice corrosion potentials of S31260 and S31254 SS became larger than 0.9 V (SCE) in synthetic sea water at temperatures below 298 K, while those of S30403 and S31603 SS were less than 0 V(SCE) over the same temperature range. No rust was found on S31260 and S31254 SS specimens at temperatures below 298 K in the atmospheric corrosion test, consistent with the temperature dependency of crevice corrosion potential. From the test result, the critical temperature for atmospheric corrosion was estimated to be 293 K for both S31260 and S31254 SS.
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See more of The CORROSION 2008 Conference and Expo (March 16-20, 2008)
See more of Research Topical Symposium
See more of The CORROSION 2008 Conference and Expo (March 16-20, 2008)