Method of coextracting neptunium and plutonium

Details Method of coextracting neptunium and plutonium Method of coextracting neptunium and plutonium

1994-09-12

1996-12-17

Mai, Ngoclan

Compositions

Radioactive compositions

Nuclear reactor fuel

423 10, 2041574, 2041582, 976DIG279, C09K 1104

Patent

active

055850430

ABSTRACT:
In a method of coextracting neptunium and plutonium, a nitric acid solution containing a mixture of neptunium and plutonium is oxidized by irradiation of ultraviolet light. As a result, different valences of neptunium are adjusted all into the valence 6, which can remain in water, and in the meantime, valences of plutonium are adjusted into the valence 4 or 6, which can be extracted in the organic phase. It is therefore possible to coextract neptunium and plutonium without difficulty. The coextracted neptunium and plutonium can be used in forming mixed fuel by blending at least a portion of at least one of neptunium and plutonium which neptunium and plutonium have been formed by separating a nitric acid solution containing neptunium and plutonium by exposing the solution and a reducing agent to ultraviolet radiation to adjust the valences, and extracting the solution using an organic phase to extract plutonium from the solution into the organic phase.

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Fukasawa, T. et al, "Partitioning of Neptunium from high level reprocessing solution with valence control", 1993, Proc. Int. Conf. Technol. Expo. Future Nucl. Sys, vol. 1, pp. 89-96.
Palei et al, Radiation Chemistry and Photochemistry, vol. 71, Abstract No. 76159v (1969).
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Fukasawa et al, Nuclear Technology, vol. 120, Abstract 146,806k (1994).
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1993 Fall Meeting of the Atomic Energy Society of Japan, Oct. 9-11, 1993. No translation.
PNC Technical Review, No. 88, Dec. 1993, "Basic Study of Photochemical Valency Adjustment of Plutonium (Pu) and Neptunium (Np) in Nitric Acid Solution," pp. 40-53. No translation.

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