Some general drawbacks in the treatment of radioactive wastes from spent nuclear fuel reprocessing

German, K.E.

Автор: German K.E.
Сборник: Fundamental basis for advanced treatment of radioactive wastes. Proceedings and selected lectures of the 2d International school – seminar
Тезисы
Год издания: 2018
Место издания: Publishing house "GRANIСA" Moscow
Первая страница: 12
Последняя страница: 38
Аннотация: Our motivation for exploring Tc chemistry for the Closed Fuel Cycle: 1) Tc-99 is a key dose contributor at HLW repositories if TRU elements are greatly reduced by recycling 2) long half-life of Tc (t1/2 = 2.14 x 105 years), high mobility, and solubility under oxidizing conditions. 3) Methods for managing the long-term threat of Tc to the environment 4) Stable waste form/repository system providing with strict limits for Tc release over a long period of time (~1 million years?). 5) Transmutation of radioactive Tc to stable Ru in nuclear rectors. Main problems of Tc : ฀ Tc is important item in Nuclear Industry ฀ Tc redistribution in PUREX produces flows with long-lived high radioactive wastes ฀ Tc interferes at U/Pu separation stage in PUREX process ฀ Tc accumulation in High burn-up fuel together with Mo, Ru, Rh ฀ Tc in nuclear waste vitrification: Tc-Mo- Ru metal phases, Tc(VII) volatility Problematic High level solid Tc/Mo/NM wastes dissolution and vitrification: Increasing burn-up in the SNF leads to lower oxidative potential – the metals like Mo, Tc, Ru forming mutual e-phase (white inclusions) that is insoluble in nitric acid – formation of HLSW. In vitrification of HLLW the same metals (Mo, Tc, Ru) are either volatile (oxic conditions) or forming metal e-phase dendrites (reducing conditions) that lead to several furnace problems (Rokkasho-mura vitrification ) Investigation of these phases by means of X-ray, diffraction, NMR, EXAFS and others could help us in handling them.
Добавил в систему: Герман Константин Эдуардович

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