Title: STUDIES ON NONEQUILIBRIUM PHYSICO-CHEMICAL PROCESSES IN THE SYSTEM "FUEL CONTAINING MASSES - AQUEOUS SOLUTIONS OF RADIOACTIVE ELEMENTS"
Authors: I.R.Yukhnovskii, M.V.Tokarchuk, V.V.Ignatyuk, A.E.Kobryn, I.P.Omelyan, R.I.Zhelem, (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., UA-290011 Lviv-11, Ukraine), G.S.Dmytriv, (Inorganic Chemistry Department, Lviv State University, 8a Kyryl and Mefodij St., UA-290005 Lviv-05, Ukraine), O.L.Ivankiv (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine 1 Svientsitskii St., UA-290011 Lviv-11, Ukraine)

The main forms of nuclear fuel remaining inside the "Shelter" object and the main interrelated factors of nuclear and ecological danger are considered. Processes of interaction of fuel containing masses with water are analysed on the basis of experimental data. A statistical model for the description of radioactive elements is proposed. The pair structure distribution functions for ions UO$_2^{2+}$, Cs$^+$ and Sr$^{2+}$ in aqueous solutions use this model. Chemical reactions of complex formations with the participation of UO$_2^{2+}$ and PuO$_2^{2+}$ as well as reactions of radiolysis in aqueous solutions of radioactive elements are analysed. Nonuniform equations for the description of UO$_2^{2+}$, Cs$^+$ and Sr$^{2+}$ ions diffusion from glassy-like fuel containing masses into water and equations of chemical kinetics of radiolysis processes are obtained as well. The shear viscosity and mutual diffusion coefficients of ions UO$_2^{2+}$, PuO$_2^{2+}$, Cs$^+$ and Sr$^{2+}$ in aqueous solutions are calculated numerically for concentrations which are typical of the ``Shelter'' object.

Comments: Figs. 3, Refs. 71, Tabs. 0.