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高選択・制御性沈殿剤による高度化沈殿法再処理システムの開発,16; 低疎水性沈殿剤NBPの耐久性及び劣化機構の検討

Development of advanced reprocessing system using highly selective and controllable precipitant, 16; Examinations of stability of NBP with low hydrophobicity and decomposition mechanism

野上 雅伸*; 杉山 雄一*; 川崎 武志*; 原田 雅幸*; 池田 泰久*; 川田 善尚; 森田 泰治  ; 菊池 俊明*

Nogami, Masanobu*; Sugiyama, Yuichi*; Kawasaki, Takeshi*; Harada, Masayuki*; Ikeda, Yasuhisa*; Kawata, Yoshihisa; Morita, Yasuji; Kikuchi, Toshiaki*

ピロリドン誘導体を用いた沈殿法による高速炉燃料の高度化再処理システムを開発している。本研究では、沈殿法再処理システムにおけるUを選択的に沈殿させる第1沈殿工程用の低疎水性候補沈殿剤であるN-n-ブチル-2-ピロリドン(NBP)の$$gamma$$線照射試験及び加熱試験を種々の条件で行い、その劣化機構について検討した。その結果、多官能性の劣化生成物が複数生成するため、これらがこれ以降の工程に与える影響について詳細に検討する必要があることが明らかとなった。

We have been developing an advanced reprocessing system for spent FBR fuels based on precipitation method using pyrrolidone derivatives. In the present study, the durability of N-n-butyl-2-pyrrolidone (NBP) against $$gamma$$-irradiation and heat and the mechanism of degradation were examined in the various conditions. NBP is the most promising candidate as the precipitant for the first step in which U is selectively separated. The results showed that many kinds of multi-functional degradation products were formed by irradiation and heating and therefore that the influence of these degradation products on the following step in the reprocessing system should be investigated in detail.

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