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Stability of Mineral Matter in Aqueous Media of the Chernobyl Unit-4 Shelter: Thermodynamic Evaluation

Published online by Cambridge University Press:  03 September 2012

V. A. Sinitsyn ,
D. A. Kulik ,
M. Skhodorivski ,
V. A. Kurepin ,
A. Y. Abramis ,
I. L. Kolyabina  and
N. A. Shurpach
V. A. Sinitsyn
Affiliation:
Institute of Geochemistry, Mineralogy & Ore Formation, NAS Ukraine, 252180 Kyiv, Ukraine R&D Centre “META”, Minchornobyl Ukraine, 255620 Chomobyl, Ukraine
D. A. Kulik
Affiliation:
State Scientific Centre for Environmental Radiogeochemistry, 252180 Kyiv, Ukraine
M. Skhodorivski
Affiliation:
R&D Centre “META”, Minchornobyl Ukraine, 255620 Chomobyl, Ukraine
V. A. Kurepin
Affiliation:
Institute of Geochemistry, Mineralogy & Ore Formation, NAS Ukraine, 252180 Kyiv, Ukraine
A. Y. Abramis
Affiliation:
R&D Centre “META”, Minchornobyl Ukraine, 255620 Chomobyl, Ukraine
I. L. Kolyabina
Affiliation:
R&D Centre “META”, Minchornobyl Ukraine, 255620 Chomobyl, Ukraine
N. A. Shurpach
Affiliation:
Institute of Geochemistry, Mineralogy & Ore Formation, NAS Ukraine, 252180 Kyiv, Ukraine
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Abstract

A special geochemical environment exists within the Shelter (”Sarcophagus”) erected in 1986 over the destroyed Unit-4 of Chernobyl nuclear power plant (NPP). Based upon the available in situ and compositional data, thermodynamic models of solid-aqueous interactions were developed to clarify the leaching behaviour of various materials within the Shelter. The “Selektor-A” code, based on a convex programming approach to Gibbs free energy minimization, was used for the calculations. A built-in flexible hybrid thermodynamic database for the system Na-K-Ca-Mg-Cl-S-N-H-O-Si-P-Fe-Al-Sr-Cs was extended with the critically selected and matched parameters for aqueous species and solid phases in the U-Zr-Si-O-H subsystem, secondary U-minerals, mineral phases of fully hydrated Portland cements and U-bearing zircons. Modeling results show that the “Shelter waters” can selectively leach a significant quantity of U and Si from the fuel-containing masses, while Zr, Fe, Ca, Mg and some other components are rather insoluble. Serpentinite, assemblages of fully-hydrated phases of Portland cements, and oxidation products of steel structural elements are estimated to be sufficiently stable in the aqueous environment of the Shelter. Our calculations also define some feasible pathways for secondary mineral formation from evaporation of Shelter water solutions and interactions between these waters with the mineral matter inside the Shelter.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 1327
Copyright
Copyright © Materials Research Society 1997

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