Radioactive nuclides recovery from spent solvent in STRAD project, 2; Zr adsorption onto ion exchange resins

中村 文也*; 安倍 諒治*; 新井 剛*; 瀬古 典明*; 荒井 陽一  ; 渡部 創  ; 野村 和則  

Nakamura, Fumiya*; Abe, Ryoji*; Arai, Tsuyoshi*; Seko, Noriaki*; Arai, Yoichi; Watanabe, So; Nomura, Kazunori

It is considered that tributyl phosphate (TBP) contained in spent PUREX solvent is well known to decompose into dibutyl phosphate (DBP) by radiation exposure. It has been found that DBP extracts U and Pu to form strong complexes. Since these complexes have stability even at low nitric acid solution, the spent solvent loaded with U and Pu for a long term is difficult to back extracted using nitric solution. Therefore, we have studied the treatment method for adsorbing of U and Pu from spent solvent using adsorbent. In this study, the method of Zr(IV) quantitative analysis using fluorescence spectroscopy was established. Moreover, adsorption behavior of Zr(IV) in DSP-n using adsorbents was evaluated. It was confirmed that non-woven fabrics with phosphoric acid type and imino diacetic acid type showed excellent adsorption ability.