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Fundamental study of the sulfide reprocessing process for oxide fuel, 1; Study on the Pu, MA and FP tracer-doped U$$_{3}$$O$$_{8}$$

Kirishima, Akira*; Mitsugashira, Toshiaki*; Onishi, Takashi ; Sato, Nobuaki*

A novel reprocessing process based on the selective sulfurization of fission products (FP) has been proposed, where FP and minor actinides (MA) are first sulfurized by CS$$_{2}$$ gas, and then, dissolved by a dilute nitric acid solution. Consequently, the fuel elements are recovered as UO$$_{2}$$ and PuO$$_{2}$$. As a basic research of this new concept, the sulfurization and dissolution behaviors of U, Pu, Np, Am, Eu, Cs and Sr were investigated in this paper using $$^{236}$$Pu, $$^{237}$$Np, $$^{241}$$Am, $$^{152}$$Eu, $$^{137}$$Cs and $$^{85}$$Sr doped U$$_{3}$$O$$_{8}$$ sample by $$gamma$$ ray and $$alpha$$ spectrometries. The dependence of the dissolution ratio of each element on the sulfurization temperature was studied and reasonably explained by combining the information of the sulfide phase analysis and the chemical thermodynamics of the dissolution reaction. The sulfurization temperature ranging from 350 to 450 $$^{circ}$$C seems to be promising for the separation of FP and MA from U and Pu.

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Category:Nuclear Science & Technology

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