Part of TRU waste includes a large amount of nitrate salt, the effects of which have to be evaluated in a safety assessment of co-location disposal with high level radioactive waste (HLW). High concentrations of nitrate ions from TRU waste might affect the solubility of different radionuclides in the HLW. In the current study, the effects of nitrate salt on radionuclide solubility were investigated experimentally. Solubility experiments of important and redox sensitive radionuclides, Tc(IV), Np(IV) and Se(0), were performed using various concentrations of sodium nitrate (NaNO3) and of Np(V) in NaNO3 solutions to investigate complex formation with NO3− ions. Solubility experiments of Pd(II), Sn(IV) and Nb(V) using ammonium chloride (NH4Cl) solution were also undertaken to investigate complex formation with NH3/NH4+ ions. No significant solubility enhancement was observed for Np and Se. Tc solubility in ≥0.1 mol/dm3 NaNO3 solution increased due to oxidation by nitrate ions. An increase of Np(V) solubility was expected by the chemical equilibrium model calculation with JNC-TDB, however, solubility enhancement by complex formation of Np(V) with nitrate ions was not observed. Solubility enhancement by complex formation of Sn and Nb were also not observed, only Pd solubility was increased by complex formation with NH3/NH4+ ions.
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ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management
October 3–7, 2010
Tsukuba, Japan
Conference Sponsors:
- Nuclear Engineering Division and Environmental Engineering Division
ISBN:
978-0-7918-5453-2
PROCEEDINGS PAPER
Effects of Nitrate on Nuclide Solubility for Co-Location Disposal of TRU Waste and HLW
Morihiro Mihara,
Morihiro Mihara
Japan Atomic Energy Agency, Ibaraki, Japan
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Toshiyuki Nakazawa,
Toshiyuki Nakazawa
Mitsubishi Materials Corp., Saitama, Japan
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Norikazu Yamada,
Norikazu Yamada
Mitsubishi Materials Corp., Saitama, Japan
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Gento Kamei
Gento Kamei
Japan Atomic Energy Agency, Ibaraki, Japan
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Morihiro Mihara
Japan Atomic Energy Agency, Ibaraki, Japan
Toshiyuki Nakazawa
Mitsubishi Materials Corp., Saitama, Japan
Norikazu Yamada
Mitsubishi Materials Corp., Saitama, Japan
Gento Kamei
Japan Atomic Energy Agency, Ibaraki, Japan
Paper No:
ICEM2010-40040, pp. 65-70; 6 pages
Published Online:
April 5, 2011
Citation
Mihara, M, Nakazawa, T, Yamada, N, & Kamei, G. "Effects of Nitrate on Nuclide Solubility for Co-Location Disposal of TRU Waste and HLW." Proceedings of the ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management. ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, Volume 2. Tsukuba, Japan. October 3–7, 2010. pp. 65-70. ASME. https://doi.org/10.1115/ICEM2010-40040
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