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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).”
O. K. Tallent, J. C. Mailen
Nuclear Technology | Volume 34 | Number 3 | August 1977 | Pages 416-419
Technical Paper | Chemical Processing | doi.org/10.13182/NT77-A31806
Articles are hosted by Taylor and Francis Online.
The effects of Cu2+, Hg2+, Zn2+, La3+, Ce3+, Al3+, Pu4+, Th4+, and Zr4+ metal ion impurities on PuO2 dissolution in 8.0M HNO3—0.1M HF solution at 100°C have been investigated. Results based on 1.0 h of dissolution time show that such metal ions as Al3+, Pu4+, Th4+, and Zr4+, which form strong fluoride complexes, greatly decrease the dissolution rate, whereas such metal ions as Cu2+, Hg2+, Zn2+, La3+, and Ce3+, which form relatively weak fluoride complexes, have little or no effect. Fluoride ion activities in the dissolvents were calculated based on an empirical equation, K1aF + aF − 0.10 γs = 0, where K1, aF, and γs denote first metal ion fluoride complex stability constant, fluoride ion activity, and stoichiometric fluoride ion activity coefficient, respectively. The PuO2 dissolution rates were found to increase linearly with increase in the calculated fluoride ion activities.