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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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ANS joins others in seeking to discuss SNF/HLW impasse
The American Nuclear Society joined seven other organizations to send a letter to Energy Secretary Christopher Wright on July 8, asking to meet with him to discuss “the restoration of a highly functioning program to meet DOE’s legal responsibility to manage and dispose of the nation’s commercial and legacy defense spent nuclear fuel (SNF) and high-level radioactive waste (HLW).”
J. C. Wood
Nuclear Technology | Volume 23 | Number 1 | July 1974 | Pages 63-79
Technical Paper | Material | doi.org/10.13182/NT74-A31434
Articles are hosted by Taylor and Francis Online.
Various zirconium alloys have been exposed to iodine vapor at 300°C under static tensile stress and marked differences in their cracking behaviors were observed. Some alloys that resisted cracking in iodine before irradiation became susceptible after receiving neutron fluences exceeding 2 × 1024n/m2, (E > 1 MeV) in the proximity of UO2 fuel but not after irradiation to higher fluences in air. Control tests showed that fission products adhering to or implanted into the surfaces of irradiated tubing did not cause cracking in the absence of deliberately added iodine. Experiments confirmed the strong influence of residual stresses on the cracking of cold drawn unirradiated tubes under static applied stress. Treatments that decreased the tensile residual stresses (roller straightening, shot peening, and irradiation to a low fluence of fast neutrons) reduced the likelihood of stress corrosion cracking in iodine vapor. After Zircaloy has reacted chemically with iodine, the Zircaloy picks up hydrogen rapidly. It was also observed that hydrided Zircaloy has a higher resistance to iodine-induced cracking than unhy-drided Zircaloy. Surface coatings of graphite and baked poly-dimethyl-siloxane grease that protect Zircaloy from iodine attack have been tested and are discussed here.