Nuclear Recycle Chemistry

Assistant Professor

  • UEHARA, Akihiro e-mail: auehara<atmark>

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This section conducts chemical researches of the heavy elements and isotopes, which leads to the advancement of the chemical technologies for “recycling”.

Heavy elements that have f-electron orbitals, which are called lanthanide and actinide, show particular chemical characteristics under various conditions. They are significant in the waste management in nuclear fuel cycles, and their basic chemistry is essential for the advancement of the separation and recovery process for them. The objective of the research is to study the chemical characteristics and specific behaviors of f-elements under the condition of various systems, such as aqueous solution, highly concentrated salt solution, molten salt, liquid metal, as well as of environmental systems. For these studies, analytical methods using electrochemistry, spectroscopy, chromatography, mass spectrometry, and radiochemical techniques are adopted. By clarifying the principles and mechanisms of the chemical reactions of these elements, the development of advanced chemical separation and purification technique for “recycling technology” is projected. One of the technological objectives of our study is the advancement of the chemical processing of spent nuclear fuels and radioactive wastes. Researches are conducted on the following scientific subjects with respect to transuranic elements and lanthanides.

  1. Coordination properties and separation characteristics of f-elements in high temperature melts and highly concentrated electrolyte solutions
  2. Chemistry for the advancement of the processing of nuclear fuels and radioactive wastes

Experiment of molten salt system for TRU elements
Experiment of molten salt system for TRU elements