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39-years Performance of Cemented Radioactive Waste in a Mound Type Repository

Published online by Cambridge University Press:  21 March 2011

Igor A. Sobolev ,
Sergey A. Dmitriev ,
Alexander S. Barinov ,
Galina A. Varlakova ,
Zoya I. Golubeva ,
Irene V. Startceva  and
Michael I. Ojovan
Igor A. Sobolev
Affiliation:
Scientific and Industrial Association “Radon”, Moscow, Russia
Sergey A. Dmitriev
Affiliation:
Scientific and Industrial Association “Radon”, Moscow, Russia
Alexander S. Barinov
Affiliation:
Scientific and Industrial Association “Radon”, Moscow, Russia
Galina A. Varlakova
Affiliation:
Scientific and Industrial Association “Radon”, Moscow, Russia
Zoya I. Golubeva
Affiliation:
Scientific and Industrial Association “Radon”, Moscow, Russia
Irene V. Startceva
Affiliation:
Scientific and Industrial Association “Radon”, Moscow, Russia
Michael I. Ojovan
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, University of Sheffield, United Kingdom
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Abstract

Long-term field tests of cemented aqueous radioactive wastes in an experimental mound type surface repository were carried out at Moscow Scientific and Industrial Association “Radon” from 1965 to 2004. Aqueous radioactive wastes of different compositions containing short-lived radionuclides including 90Sr and 137Cs at concentrations from 0.34 to 1.8 MBq/L were immobilized using cementation technology. Water solution to cement ratio was 0.66, grout mixing time 10-15 minutes, and cement paste hardening time 7 days. 73 cement blocks with a volume of 0.027 m3 were disposed of for long-term tests in a simple mound type surface repository. The atmospheric precipitates, which contacted radioactive cement blocks, were collected and analyzed for the content of radionuclides. In August 2004 the experimental repository was opened, cemented blocks, underlying and covering materials were retrieved for analyses. XRD analyses showed that along with amorphous tobermorite gel the main crystal phases in cements are calcite and portlandite. Both visual inspection and radiometric analyses demonstrate that cemented blocks are in good condition and that the cement paste has retained radionuclides from the wastes. Thus after 39 years of storage in the mound type repository the cemented aqueous wastes are reliable immobilized.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 932: Symposium – Scientific Basis for Nuclear Waste Management XXIX , 2006 , 43.1
Copyright
Copyright © Materials Research Society 2006

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