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Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
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Remembering Charles E. Till
Charles E. Till
Charles E. Till, an ANS member since 1963 and Fellow since 1987, passed away on March 22 at the age of 89. He earned bachelor’s and master’s degrees from the University of Saskatchewan and a Ph.D. in nuclear engineering from Imperial College, University of London. Till initially worked for the Civilian Atomic Power Department of the Canadian General Electric Company, where he was the physicist in charge of the startup of the first prototype CANDU reactor in Canada.
Till joined Argonne National Laboratory in 1963 in the Applied Physics Division, where he worked as an experimentalist in the Fast Critical Experiments program. He then moved to additional positions of increasing responsibility, becoming division director in 1973. Under his leadership, the Applied Physics Division established itself as one of the elite reactor physics organizations in the world. Both the experimental (critical experiments and nuclear data measurements) and nuclear analysis methods work were internationally recognized. Till led Argonne’s participation in the International Nuclear Fuel Cycle Evaluation (INFCE), and he was the lead U.S. delegate to INFCE Working Group 5, Fast Breeders.
T. Ahn, H. Jung, P. Shukla, X. He
Nuclear Technology | Volume 182 | Number 1 | April 2013 | Pages 111-122
Technical Paper | Materials for Nuclear Systems | doi.org/10.13182/NT13-A15831
Articles are hosted by Taylor and Francis Online.
Crevice corrosion is the predominant mode of localized corrosion of Alloy 22 in concentrated chloride solutions at near-boiling temperatures. A literature review was performed to assess the electrochemical criteria for the long-term initiation of stable crevice corrosion of nickel-based or passive alloys, such as Alloy 22, in terms of likelihood, timing, and magnitude of potential damage due to crevice corrosion. The assessment in this study intends to predict the long-term performance of the waste package in nuclear waste management. Specifically, the areas of review included (a) environments (e.g., solution chemistry and electrochemical polarized condition) and crevice corrosion initiation criteria, (b) data and models for Alloy 22 crevice corrosion, and (c) induction times for crevice corrosion initiation. The assessment of the criteria for crevice corrosion initiation indicates that without externally applied current (i.e., at the open-circuit corrosion potential), initiation of crevice corrosion could be more difficult compared to the case when external current is applied. Without external current, crevice corrosion may not be initiated and sustained until the corrosion potential reaches the breakdown potential. Because the breakdown potential is typically more anodic than the repassivation potential, it is likely that the use of repassivation potential as the initiation criterion can overestimate a localized corrosion susceptibility. A short-term laboratory polarization test of Alloy 22 investigated whether any pits developed under the crevice were unstable for growth and if they could be stifled (i.e., suppressed). The long-term immersion tests of Alloy 22 exhibited a trend of continuous decrease of corrosion rate with time while the corrosion potential increased with time. An assessment of the theoretical models appeared to adequately scale induction time for crevice corrosion initiation to extrapolated long time periods.