検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Uranium crystallization test with dissolver solution of irradiated fuel

照射済燃料の溶解液を用いたウラン晶析試験

矢野 公彦 ; 柴田 淳広 ; 野村 和則 ; 小泉 務; 小山 智造

Yano, Kimihiko; Shibata, Atsuhiro; Nomura, Kazunori; Koizumi, Tsutomu; Koyama, Tomozo

晶析プロセスを高速炉サイクルのための先進湿式法、NEXT($$underline{N}$$ew $$underline{Ex}$$traction System for $$underline{T}$$RU recovery)の一部として開発している。このプロセスでは、溶解液からウランの大部分をUO$$_{2}$$(NO$$_{3}$$)$$_{2}$$$$cdot$$6H$$_{2}$$Oの晶析によって分離するものである。そこで、実際に照射済燃料を用いたU晶析試験を実施し、結晶の大きさへの冷却速度の影響やPuと比較してのFPの挙動を調べた。冷却速度の影響に関しては、冷却速度が速いほうが結晶の大きさが小さくなることがわかった。しかしながら、比表面積を小さくすることで除染性能の改善が期待できると考えたが大きな結晶が必ずしも純度が高いとは限らないということが示唆された。また、FPの挙動については、EuはPu(IV)と似た挙動をとる。Csについてはこの試験の条件ではUと結晶へ同伴する結果となった。

The crystallization process has been developed as a part of the advanced aqueous process, NEXT ($$underline{N}$$ew $$underline{Ex}$$traction System for $$underline{T}$$RU recovery) for fast reactor (FR) cycle. In this process, a large part of U is separated from dissolver solution by crystallization as UO$$_{2}$$(NO$$_{3}$$)$$_{2}$$ 6H$$_{2}$$O. The U crystallization test was carried out with real dissolver solution of irradiated FR fuel to investigate the influence of cooling rate on the crystal size and the behavior of fission product (FP) compared with that of Pu(IV). In regard to the influence of the cooling rate, it was obvious that the crystal size was smaller as the cooling rate is faster. Although it was expectable that the decontamination performance was improved by diminishing the specific surface of the crystals, it was suggested that a large crystal produced by crystallization was not always high purity. Concerning the behavior of FPs, Eu behaved similarly to Pu(IV). Cs accompanied with U into the crystals under the condition in this test.

Access

:

- Accesses

InCites™

:

パーセンタイル:60.87

分野:Nuclear Science & Technology

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.