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Ozawa, Masaki; Iwai, Takehiko*; Babain, V.*; Shadrin, A.*
Proceedings of International Solvent Extraction Conference "Solvent Extraction-Fundamentals to Industrial Applications" (ISEC 2008), p.623 - 628, 2008/09
Bifunctional organophosphorus extractants dissolved in polar fluorinated diluents were studied aiming at directly recovering all f-elements from the dissolver solution of spent nuclear fuel. Distribution ratios of U, Np and Pu were sufficiently high for 0.4
0.8MCMPO in this solvent system, and combination of salt-free, methylamine carbonate (MAC), etc, were evaluated to obtain fractional stripping of f-elements. Static multi-stage extraction using artificial FBR dissolver solution supported the process feasibility.
Shadrin, A. Y.*; Murzin, A. A.*; Koma, Yoshikazu; Koyama, Tomozo
no journal, ,
Befavior of fission products (FP) in supercritical fluid extraction from mixed oxide was investigated. U, Pu and Np are preferentially extracted and shows no selectivity among them. Extraction of FP increases with flowing of the supercritical CO
and TBP-nitiric acid mixture.
-elements by CMPO in fluorinated diluentsOzawa, Masaki; Shadrin, A. Y.*; Babain, V.*; Zilberman, B.*; Strelkov, S.*
no journal, ,
Partitioning and transmutation of long-lived actinides in spent fuel is required for decreasing the radioactive toxicity in nuclear fuel cycle. In collaboration with the Khlopin Radium Institute in St.Petersburg, fundamental extraction and stripping behaviors of f-elements and FPs were studied. New solvent composed of CMPO dissolved in TBP with fluorinated diluents such as metanitrobenzo-trifluoride showed high solubility for extracted metal complexes, and therby expanding the boundary of non-third phase formation. Obtained extraction data suggested the compatibility of ORGA process (Organophosporyl-fluoropole extractant for Recovery of Group of Actinides) as for recovering all actinides in a single extraction cycle.
Ozawa, Masaki; Shadrin, A.*; Babain, V.*; Zilberman, B.*; Strelkov, S.*
no journal, ,
Solvent extraction behaviors of actinides and fission products in simulated dissolver solution of fast reactor spent fuel were investigated by static counter-current, multi-stage extraction using novel 0.4 MOctyl(phenyl)D[iB]CMPO/30%TBP/70%fluoropole-732 solvent.