Abstract
The aim of this thesis is to contribute to the study of the nuclear glasses composition influence on their liability to deterioration. The methodology of the experimental research used has lead to define between the thirty oxides which form the reference glass light water, six oxides of interest. For each of these oxides, a composition variation area has been defined. A matrix of twenty glass compositions has then been defined. The preparation of materials of these compositions has sometimes lead to materials weakly heterogeneous which have been characterized before deterioration. This study has been completed by those of three glasses in a composition variation area narrower of the light water nuclear glass : the R7T7 and two glasses at limits having respectively an initial dissolution velocity at 100 °C theoretically maximum and minimum. Some deterioration parameters in pure water have been experimentally measured on the twenty three glasses : 1) an initial dissolution velocity at 100 °C (Vo{sub 100degC}) and another one at 90 °C (Vo{sub 90degC}) 2) a dissolution velocity in conditions near the saturation at 90 °C 3) an apparent solubility of glass based on the ortho silicic acid activity 4) the evolution of the dissolution kinetics at
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Citation Formats
Tovena, Isabelle.
Influence of nuclear glasses composition on their liability to deterioration; Influence de la composition des verres nucleaires sur leur alterabilite.
France: N. p.,
1995.
Web.
Tovena, Isabelle.
Influence of nuclear glasses composition on their liability to deterioration; Influence de la composition des verres nucleaires sur leur alterabilite.
France.
Tovena, Isabelle.
1995.
"Influence of nuclear glasses composition on their liability to deterioration; Influence de la composition des verres nucleaires sur leur alterabilite."
France.
@misc{etde_270252,
title = {Influence of nuclear glasses composition on their liability to deterioration; Influence de la composition des verres nucleaires sur leur alterabilite}
author = {Tovena, Isabelle}
abstractNote = {The aim of this thesis is to contribute to the study of the nuclear glasses composition influence on their liability to deterioration. The methodology of the experimental research used has lead to define between the thirty oxides which form the reference glass light water, six oxides of interest. For each of these oxides, a composition variation area has been defined. A matrix of twenty glass compositions has then been defined. The preparation of materials of these compositions has sometimes lead to materials weakly heterogeneous which have been characterized before deterioration. This study has been completed by those of three glasses in a composition variation area narrower of the light water nuclear glass : the R7T7 and two glasses at limits having respectively an initial dissolution velocity at 100 °C theoretically maximum and minimum. Some deterioration parameters in pure water have been experimentally measured on the twenty three glasses : 1) an initial dissolution velocity at 100 °C (Vo{sub 100degC}) and another one at 90 °C (Vo{sub 90degC}) 2) a dissolution velocity in conditions near the saturation at 90 °C 3) an apparent solubility of glass based on the ortho silicic acid activity 4) the evolution of the dissolution kinetics at 90 °C in sub-saturated medium towards saturated medium 5) the alteration films nature developed at the glasses surface during these last alteration tests. Some thermodynamic and structural models have been studied in order to predict Vo{sub 90degC} and Vo{sub 100degC}. The dissolution kinetic law developed from reference glass dissolution results has been studied with the calculation code LIXIVER. It has not been able to be used for most of the glasses compositions studied. As a consequence, the glasses dissolution control by a surface reaction which are itself controlled by the only dissolved silica is an hypothesis which is not verified for the greater part of the glasses. (O.L.) [French] Cette these est une contribution a l'etude de l'influence de la composition des verres nucleaires sur leur alterabilite. La methodologie de la recherche experimentale adoptee a permis dans un premier temps, de definir parmi les trente oxydes constitutifs du verre de reference « Eau Legere », six oxydes ou groupes d'oxydes d'interet. Pour chacun de ces oxydes, un domaine de variation de composition a ete defini: 30
place = {France}
year = {1995}
month = {Sep}
}
title = {Influence of nuclear glasses composition on their liability to deterioration; Influence de la composition des verres nucleaires sur leur alterabilite}
author = {Tovena, Isabelle}
abstractNote = {The aim of this thesis is to contribute to the study of the nuclear glasses composition influence on their liability to deterioration. The methodology of the experimental research used has lead to define between the thirty oxides which form the reference glass light water, six oxides of interest. For each of these oxides, a composition variation area has been defined. A matrix of twenty glass compositions has then been defined. The preparation of materials of these compositions has sometimes lead to materials weakly heterogeneous which have been characterized before deterioration. This study has been completed by those of three glasses in a composition variation area narrower of the light water nuclear glass : the R7T7 and two glasses at limits having respectively an initial dissolution velocity at 100 °C theoretically maximum and minimum. Some deterioration parameters in pure water have been experimentally measured on the twenty three glasses : 1) an initial dissolution velocity at 100 °C (Vo{sub 100degC}) and another one at 90 °C (Vo{sub 90degC}) 2) a dissolution velocity in conditions near the saturation at 90 °C 3) an apparent solubility of glass based on the ortho silicic acid activity 4) the evolution of the dissolution kinetics at 90 °C in sub-saturated medium towards saturated medium 5) the alteration films nature developed at the glasses surface during these last alteration tests. Some thermodynamic and structural models have been studied in order to predict Vo{sub 90degC} and Vo{sub 100degC}. The dissolution kinetic law developed from reference glass dissolution results has been studied with the calculation code LIXIVER. It has not been able to be used for most of the glasses compositions studied. As a consequence, the glasses dissolution control by a surface reaction which are itself controlled by the only dissolved silica is an hypothesis which is not verified for the greater part of the glasses. (O.L.) [French] Cette these est une contribution a l'etude de l'influence de la composition des verres nucleaires sur leur alterabilite. La methodologie de la recherche experimentale adoptee a permis dans un premier temps, de definir parmi les trente oxydes constitutifs du verre de reference « Eau Legere », six oxydes ou groupes d'oxydes d'interet. Pour chacun de ces oxydes, un domaine de variation de composition a ete defini: 30
place = {France}
year = {1995}
month = {Sep}
}