Gilles Bordier - Academia.edu (original) (raw)
Papers by Gilles Bordier
The Atalante facility is a complete set of 18 hot labs and 9 shielded cells devoted to the resear... more The Atalante facility is a complete set of 18 hot labs and 9 shielded cells devoted to the research and development on fuel cycle. The activities correspond to four major sectors of nuclear research : − to support the operation of actual reprocessing plants with the aim of adapting the head of the process to the increase of the spend fuel burn-up and to different types of new burnt fuels to be reprocessed (including MOX, USi or UMo fuels), − to develop the COEX TM process, − to prepare the recycling of minor actinides (MA) by partitioning or by grouped actinide extraction, and by MA bearing fuel fabrication, − to study the long term behavior of high level waste conditioning matrices and especially self irradiation and leaching of vitrified waste. The first hot lab of Atalante was operated in 1992, the process shielded cell (CBP) in 2003 and the last LN1 lab in 2005, while at the same time a large scale demonstration test on the DIAMEX-SANEX MA partitioning process was performed. Now...
SmS a ete etudie pour la transition de la phase de basse pression (phase noire) a la phase de hau... more SmS a ete etudie pour la transition de la phase de basse pression (phase noire) a la phase de haute pression de valence intermediaire ; mais l'etude de la phase noire s'avere tres riche. Les variations des proprietes de transport electronique avec la pression a basse temperature montrent l'existence d'une phase semi-metallique situee, dans le diagramme pression-temperature, dans la phase noire pour une pression superieure a 4 kbar; elle correspond a la « phase B » du diagramme dopage-temperature. L'etude de la phase de basse pression isolante necessite un modele de dopage par des etats accepteurs. On observe de plus en resonance paramagnetique un defaut de soufre aupres duquel un ion samarium, couple magnetiquement a la matrice, transite de divalent a trivalent. Ce defaut presente deux configurations de symetries proches, et les raies de resonance s'elargissent de facon activee avec la temperature. Il est responsable d'effets metastables a basse pression ...
Génie nucléaire, 2015
Résumé/Abstract À la différence des procédés classiques (diffusion gazeuse, ultracentrifugation),... more Résumé/Abstract À la différence des procédés classiques (diffusion gazeuse, ultracentrifugation), voir l'article «Enrichissement de l'uranium»[B 3 600], les procédés à fort enrichissement élémentaire utilisent une modification de l'état physique des molécules ou ...
The European Physical Journal Plus, 2019
Abstract.This article is the second part of a work devoted to the study of the physical and econo... more Abstract.This article is the second part of a work devoted to the study of the physical and economic limits of the addition of renewable power sources to an electricity mix on a territory. In the first part of the work, devoted to methodology, we discuss three criteria of viability of the electricity mix, based on the spectral and statistical analysis of the load fluctuations, taking into account the intermittent nature of the production of the mandatory renewable sources. The present paper is devoted to the application of the MIXOPTIM software, which includes this methodological toolbox, to the metropolitan French mix. Starting from the French mix 2015, we change its composition in controlled and mandatory power sources by anamorphic deformations, and analyze, with the MIXOPTIM toolbox, the viability and performance indicators of the modified mix. The viability criteria determine the maximum amount of mandatory fluctuating sources that can be tolerated in the mix if frequent power cuts are to be avoided. They provide a tool to assess the respective merits of the controllable (e.g., coal, gas, nuclear, ... sources according to their agility and what would be gained if this agility could be improved. The study takes into account the influence of interconnection between the considered territory and its neighbors, and evaluates to what extent an increase of the interconnection capacity increases the physically allowable proportion of renewable power sources in the mix. We also evaluate the beneficial influence of demand smoothing, and of electricity storage facilities, and calculate to what extent the introduction of demand smoothing or storage facilities move the physical limits of the introduction of renewable mandatory fluctuating sources in the metropolitan French mix. In the last part of the article, we investigate the conditions under which a 100% renewable electricity mix might be viable in France.
Clefs C E a, 2005
Depuis l'origine, les dechets nucleaires sont geres en fonction des techniques les plus avanc... more Depuis l'origine, les dechets nucleaires sont geres en fonction des techniques les plus avancees disponibles au moment de leur production. Les progres de la caracterisation et de la decontamination permettent depuis d'en ameliorer le tri et, parfois, d'en declasser certains. Ce declassement permet de leur appliquer des modes de gestion a long terme plus simples. Ces progres permettent egalement d'envisager la reprise et le conditionnement des dechets anciens. Durant les diverses phases de l'existence du dechet, le "colis" reste l'"unite elementaire" de la gestion qui assure de facon perenne le confinement de la radioactivite.
Europhysics Letters (EPL), 1986
A three-line high-field EPR signal was observed at 4 K in stoichiometric SmS single crystals. As ... more A three-line high-field EPR signal was observed at 4 K in stoichiometric SmS single crystals. As Walsh et al., we attribute these signals to Sm3+ ions neighbouring a crystal defect. These spins are shown to be embedded in a square symmetry. We treat a formalism for a 5/2 spin in such a symmetry which leads us to express the g-factors as a function of one single anisotropy parameter. Comparing this model with the experimental data, and examining the widths of the lines, we deduce the value of the exchange constant with the Sm2+ neighbours and that the defect has two near configurations, both not far from cubic symmetry.
Journal de Physique III, 1994
Revue Générale Nucléaire, 2005
Les dechets radioactifs resultant de la mise en oeuvre de processus de production, de transformat... more Les dechets radioactifs resultant de la mise en oeuvre de processus de production, de transformation ou d'utilisation par un producteur se trouvent dans un flux de matieres de forme gazeuse, liquide ou solide. Pour pouvoir les gerer de facon sure, il faut les mettre sous forme de colis de dechets, qui puisse etre manutentionne, garantisse la non dispersion des radionucleides et satisfasse aux normes de transport, d'entreposage ou de stockage. Le conditionnement est ainsi l'ensemble des operations destinees a mettre les dechets radioactifs, qu'ils soient solides ou liquides, sous la forme de colis de dechets. De plus, comme c'est sur ce colis que va reposer tout ou partie de la surete du systeme de gestion, il est primordial de connaitre son evolution dans la duree : c'est le comportement a long terme. Le present article resume les etudes menees sur ces differents themes, pour l'essentiel en cooperation entre le CEA et les industriels, notamment Cogema, et met en evidence les progres realises depuis les annees 1990.
The Atalante facility is a complete set of 18 hot labs and 9 shielded cells devoted to the resear... more The Atalante facility is a complete set of 18 hot labs and 9 shielded cells devoted to the research and development on fuel cycle. The activities correspond to four major sectors of nuclear research : − to support the operation of actual reprocessing plants with the aim of adapting the head of the process to the increase of the spend fuel burn-up and to different types of new burnt fuels to be reprocessed (including MOX, USi or UMo fuels), − to develop the COEX TM process, − to prepare the recycling of minor actinides (MA) by partitioning or by grouped actinide extraction, and by MA bearing fuel fabrication, − to study the long term behavior of high level waste conditioning matrices and especially self irradiation and leaching of vitrified waste. The first hot lab of Atalante was operated in 1992, the process shielded cell (CBP) in 2003 and the last LN1 lab in 2005, while at the same time a large scale demonstration test on the DIAMEX-SANEX MA partitioning process was performed. Now...
SmS a ete etudie pour la transition de la phase de basse pression (phase noire) a la phase de hau... more SmS a ete etudie pour la transition de la phase de basse pression (phase noire) a la phase de haute pression de valence intermediaire ; mais l'etude de la phase noire s'avere tres riche. Les variations des proprietes de transport electronique avec la pression a basse temperature montrent l'existence d'une phase semi-metallique situee, dans le diagramme pression-temperature, dans la phase noire pour une pression superieure a 4 kbar; elle correspond a la « phase B » du diagramme dopage-temperature. L'etude de la phase de basse pression isolante necessite un modele de dopage par des etats accepteurs. On observe de plus en resonance paramagnetique un defaut de soufre aupres duquel un ion samarium, couple magnetiquement a la matrice, transite de divalent a trivalent. Ce defaut presente deux configurations de symetries proches, et les raies de resonance s'elargissent de facon activee avec la temperature. Il est responsable d'effets metastables a basse pression ...
Génie nucléaire, 2015
Résumé/Abstract À la différence des procédés classiques (diffusion gazeuse, ultracentrifugation),... more Résumé/Abstract À la différence des procédés classiques (diffusion gazeuse, ultracentrifugation), voir l'article «Enrichissement de l'uranium»[B 3 600], les procédés à fort enrichissement élémentaire utilisent une modification de l'état physique des molécules ou ...
The European Physical Journal Plus, 2019
Abstract.This article is the second part of a work devoted to the study of the physical and econo... more Abstract.This article is the second part of a work devoted to the study of the physical and economic limits of the addition of renewable power sources to an electricity mix on a territory. In the first part of the work, devoted to methodology, we discuss three criteria of viability of the electricity mix, based on the spectral and statistical analysis of the load fluctuations, taking into account the intermittent nature of the production of the mandatory renewable sources. The present paper is devoted to the application of the MIXOPTIM software, which includes this methodological toolbox, to the metropolitan French mix. Starting from the French mix 2015, we change its composition in controlled and mandatory power sources by anamorphic deformations, and analyze, with the MIXOPTIM toolbox, the viability and performance indicators of the modified mix. The viability criteria determine the maximum amount of mandatory fluctuating sources that can be tolerated in the mix if frequent power cuts are to be avoided. They provide a tool to assess the respective merits of the controllable (e.g., coal, gas, nuclear, ... sources according to their agility and what would be gained if this agility could be improved. The study takes into account the influence of interconnection between the considered territory and its neighbors, and evaluates to what extent an increase of the interconnection capacity increases the physically allowable proportion of renewable power sources in the mix. We also evaluate the beneficial influence of demand smoothing, and of electricity storage facilities, and calculate to what extent the introduction of demand smoothing or storage facilities move the physical limits of the introduction of renewable mandatory fluctuating sources in the metropolitan French mix. In the last part of the article, we investigate the conditions under which a 100% renewable electricity mix might be viable in France.
Clefs C E a, 2005
Depuis l'origine, les dechets nucleaires sont geres en fonction des techniques les plus avanc... more Depuis l'origine, les dechets nucleaires sont geres en fonction des techniques les plus avancees disponibles au moment de leur production. Les progres de la caracterisation et de la decontamination permettent depuis d'en ameliorer le tri et, parfois, d'en declasser certains. Ce declassement permet de leur appliquer des modes de gestion a long terme plus simples. Ces progres permettent egalement d'envisager la reprise et le conditionnement des dechets anciens. Durant les diverses phases de l'existence du dechet, le "colis" reste l'"unite elementaire" de la gestion qui assure de facon perenne le confinement de la radioactivite.
Europhysics Letters (EPL), 1986
A three-line high-field EPR signal was observed at 4 K in stoichiometric SmS single crystals. As ... more A three-line high-field EPR signal was observed at 4 K in stoichiometric SmS single crystals. As Walsh et al., we attribute these signals to Sm3+ ions neighbouring a crystal defect. These spins are shown to be embedded in a square symmetry. We treat a formalism for a 5/2 spin in such a symmetry which leads us to express the g-factors as a function of one single anisotropy parameter. Comparing this model with the experimental data, and examining the widths of the lines, we deduce the value of the exchange constant with the Sm2+ neighbours and that the defect has two near configurations, both not far from cubic symmetry.
Journal de Physique III, 1994
Revue Générale Nucléaire, 2005
Les dechets radioactifs resultant de la mise en oeuvre de processus de production, de transformat... more Les dechets radioactifs resultant de la mise en oeuvre de processus de production, de transformation ou d'utilisation par un producteur se trouvent dans un flux de matieres de forme gazeuse, liquide ou solide. Pour pouvoir les gerer de facon sure, il faut les mettre sous forme de colis de dechets, qui puisse etre manutentionne, garantisse la non dispersion des radionucleides et satisfasse aux normes de transport, d'entreposage ou de stockage. Le conditionnement est ainsi l'ensemble des operations destinees a mettre les dechets radioactifs, qu'ils soient solides ou liquides, sous la forme de colis de dechets. De plus, comme c'est sur ce colis que va reposer tout ou partie de la surete du systeme de gestion, il est primordial de connaitre son evolution dans la duree : c'est le comportement a long terme. Le present article resume les etudes menees sur ces differents themes, pour l'essentiel en cooperation entre le CEA et les industriels, notamment Cogema, et met en evidence les progres realises depuis les annees 1990.