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Determination of the secondary phases at the acidic LNW disposal

Published online by Cambridge University Press:  20 February 2017

Irina Vlasova ,
Anna Romanchuk ,
Anna Volkova ,
Elena Zakharova ,
Igor Presnyakov ,
Alexey Sobolev  and
Stepan Kalmykov
Irina Vlasova*
Affiliation:
Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Anna Romanchuk
Affiliation:
Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Anna Volkova
Affiliation:
Frumkin Institute of Physical chemistry and Electrochemistry RAS, Moscow, Russia
Elena Zakharova
Affiliation:
Frumkin Institute of Physical chemistry and Electrochemistry RAS, Moscow, Russia
Igor Presnyakov
Affiliation:
Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Alexey Sobolev
Affiliation:
Frumkin Institute of Physical chemistry and Electrochemistry RAS, Moscow, Russia
Stepan Kalmykov
Affiliation:
Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
*
*(Email: [email protected])
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Abstract

The migration behavior of the long-lived actinides was studied under the conditions of the deep disposal of the acidic liquid nuclear waste (LNW). Composition of LNW varies significantly including acidic technological wastes (pH ∼2.4), which consist of sodium nitrate, acetic acid, corrosion products (Fe, Cr, Mn, Ni, Al), fission products and actinides. Corrosion products tend to precipitate under the LNW disposal conditions that favor forming of the phases with high sorption capacity towards actinides. Sands of reservoir bed have their own initial sorbent surfaces besides new secondary phases that have formed as a result of interaction with acidic LNW. The nearest to the injection well conditions are gradually changing from pH ∼2.4 till neutral values due to the dilution by groundwater with formation of new precipitated phases of corrosion products. The solid phases characterization is a necessary step on the path of knowledge of migration behavior of actinides. The secondary phases of both corrosion products and sands of reservoir bed under LNW disposal conditions were characterized using XRD, SEM and Mössbauer spectroscopy. The recent results of the analyses of the behavior of actinides (Pu. U, Np, Am) under the conditions of the injection of the acid LNW are presented in the paper.

Keywords

Corrosionactinideadsorption
Type
Articles
Information
MRS Advances , Volume 1 , Issue 61: Scientific Basis for Nuclear Waste Management XXXIX , 2016 , pp. 4053 - 4059
Copyright
Copyright © Materials Research Society 2017 

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References

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