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Development of a simple reprocessing process using selective precipitant for uranyl ions; Engineering studies for precipitating and separating systems

ウラニルイオン選択的沈殿法による簡易再処理プロセスの開発; 沈殿分離システムの工学的検討

山崎 和彦*; 近沢 孝弘*; 田巻 喜久*; 菊池 俊明*; 森田 泰治 ; 川田 善尚*; 峯尾 英章 ; 古志野 伸能*; 浅沼 徳子*; 原田 雅幸*; 池田 泰久*

Yamasaki, Kazuhiko*; Chikazawa, Takahiro*; Tamaki, Yoshihisa*; Kikuchi, Toshiaki*; Morita, Yasuji; Kawata, Yoshihisa*; Mineo, Hideaki; Koshino, Nobuyoshi*; Asanuma, Noriko*; Harada, Masayuki*; Ikeda, Yasuhisa*

NCP(N-シクロヘキシル-2-ピロリドン)がウラニルイオンと選択的に沈殿を生成するという極めて特異な性質と沈殿物の取扱いの容易な点を利用し、使用済燃料溶解液中の大部分のウラニルイオンを選択的に沈殿させ、さらにプルトニウムをウランとともに沈殿させる、NCP沈殿法のみによる簡易再処理プロセスの開発研究を実施した。本発表では、実機概念をもとに設計・製作した沈殿生成槽,沈殿分離機の操作性,性能試験の結果について述べる。

N-cyclohexyl-2-pyrrolidone (NCP), can selectively precipitate U(VI) ions in aqueous nitric acid solutions. Utilizing this property, we have been developing a simple reprocessing process of spent nuclear fuel based only on precipitation method. In the first precipitation step, only U is separated by precipitation in a yield of about 70%, and in the second precipitation step both U and Pu are recovered and separated from fission products (FP) and other transuranium elements (TRU). In the present study, a precipitator and a precipitate separator were designed and built up, and were tested with aspets of operationability and system performance.

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