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Report No.
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Study on pyrochemical process for the treatment of spent nitride fuel containing americium

Hayashi, Hirokazu; Akabori, Mitsuo; Arai, Yasuo; Minato, Kazuo

R&D on the transmutation of long-lived minor actinides (MA) by the accelerator-driven system (ADS) using nitride fuels is underway at JAEA. In regard to reprocessing technology, pyrochemical process has several advantages in case of treating spent fuel with large decay heat and fast neutron emission, and recovering highly enriched $$^{15}$$N. In the pyrochemical reprocessing, plutonium and MA are dissolved in LiCl-KCl eutectic melts and selectively recovered into liquid cadmium cathode by molten salt electrorefining. The electrochemical behavior in LiCl-KCl eutectic melts and the subsequent nitride formation behavior of plutonium and MA recovered in liquid Cd cathode are investigated. Recent results on the behavior of americium (Am) in the pyrochemical process for the treatment of spent nitride fuel, which include preparation of AmCl$$_3$$ and electrochemical behavior of Am in LiCl-KCl eutectic melts, are presented.

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