Study on a nuclear fuel reprocessing system based on the precipitation method in mild aqueous solutions

Yuichiro Asano, Noriko Asanuma, Toshihiko Ito, Makoto Kataoka, Shinya Fujino, Tomoo Yamamura, Wataru Sugiyama, Hiroshi Tomiyasu, Kunihiko Mizumachi, Yasuhisa Ikeda, Yukio Wada, Masami Asou

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A new reprocessing system for spent nuclear fuels based on a precipitation method is proposed to recover uranium and transuranium elements from spent nuclear fuels in high ratios and to achieve extreme safety without any potential dangers. Experiments were carried out for a simulated fuel solution containing uranium and 17 major elements. The main reprocessing processes are as follows: (a) dissolution of UO2 fuel under mild conditions; (b) neutralization of the dissolved fuel solution with Na2CO3-NaHCO3 mixed solutions, followed by the separation of precipitated fission products by centrifugation; (c) separation of cesium by a precipitation method using a tetraphenylborate ion; and (d) recovery of uranium (U) as a precipitate of the hydrolyzed compound from an alkaline solution. As a result, 99.95% of the U was recovered with the least amount of fission products, i.e., 10-5 g or even less in the recovered 1 g of U with the only exceptions being zirconium and molybdenum.

Original languageEnglish
Pages (from-to)198-210
Number of pages13
JournalNuclear Technology
Issue number3
Publication statusPublished - 1997 Dec


  • Mild condition
  • Nuclear fuel reprocessing
  • Precipitation method

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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