The Experts below are selected from a list of 3705 Experts worldwide ranked by ideXlab platform
Collin Frédéric - One of the best experts on this subject based on the ideXlab platform.
-
Modélisation numérique des expériences d'injection de gaz E4 et E5
Belgique Liège : Université de Liège, 2019Co-Authors: Corman Gilles, Collin FrédéricAbstract:Nowadays, the Deep Geological Disposal based on the multi-barriers confinement concept, is considered as one of the most promising solutions for the safe storage of radioactive wastes. Many Thermo-Hydro-Mechanical (THM) phenomena are likely to occur during the construction and the lifetime of the repository, which could alter the confining function of the different constituent layers. Among these, the underground excavation process tends to create a so-called Excavation Damaged Zone (EDZ) in the surrounding of the storage galleries, where the mechanical and hydraulic properties are affected. For instance, the hydraulic permeability is increased compared to the sound rock formation. Moreover, during the exploitation of the system, a certain amount of gases, such as hydrogen could actually be generated in the nearfield of the repository due to the anoxic corrosion of the metal components, and lead to the alteration of the host rock behaviour. In light of this, the present work aims at developing a numerical tool within the finite element code LAGAMINE1, able to reproduce simultaneously the development of strain localisation bands due to excavation, the multiphysical couplings associated with gas generation and migrations, as well as their possible close interactions. This model includes on the one hand a THM part to describe triphasic porous media under unsaturated and non-isothermal conditions. On the other hand, since the problem involving strain localisation is not well posed when modelled using classical mechanics, the local second gradient approach is also integrated to the model. It helps avoiding the pathological mesh dependency by considering an enrichment of the continuum with microstructure effects through a regularizing internal length. This model is subsequently put into practise for the case of Boom Clay Formation, investigated by the Belgian National Radioactive Waste Management Agency (ONDRAF) to host a Deep Geological Disposal. More particularly, two in situ gas injection tests conducted in two distinct directions in the Underground Research Laboratory (URL) in Mol, are simulated in 2D plane stain state. The modelling finally provides information about the fracture structure and permeability evolution due to the excavation, and about the stress state during a second phase of pore pressures stabilization, and a last phase of gas migrations
-
Modélisation numérique des expériences d'injection de gaz E4 et E5
Université de Liège, 2019Co-Authors: Corman Gilles, Collin FrédéricAbstract:audience: researcher, professionalNowadays, the Deep Geological Disposal based on the multi-barriers confinement concept, is considered as one of the most promising solutions for the safe storage of radioactive wastes. Many Thermo-Hydro-Mechanical (THM) phenomena are likely to occur during the construction and the lifetime of the repository, which could alter the confining function of the different constituent layers. Among these, the underground excavation process tends to create a so-called Excavation Damaged Zone (EDZ) in the surrounding of the storage galleries, where the mechanical and hydraulic properties are affected. For instance, the hydraulic permeability is increased compared to the sound rock formation. Moreover, during the exploitation of the system, a certain amount of gases, such as hydrogen could actually be generated in the nearfield of the repository due to the anoxic corrosion of the metal components, and lead to the alteration of the host rock behaviour. In light of this, the present work aims at developing a numerical tool within the finite element code LAGAMINE1, able to reproduce simultaneously the development of strain localisation bands due to excavation, the multiphysical couplings associated with gas generation and migrations, as well as their possible close interactions. This model includes on the one hand a THM part to describe triphasic porous media under unsaturated and non-isothermal conditions. On the other hand, since the problem involving strain localisation is not well posed when modelled using classical mechanics, the local second gradient approach is also integrated to the model. It helps avoiding the pathological mesh dependency by considering an enrichment of the continuum with microstructure effects through a regularizing internal length. This model is subsequently put into practise for the case of Boom Clay Formation, investigated by the Belgian National Radioactive Waste Management Agency (ONDRAF) to host a Deep Geological Disposal. More particularly, two in situ gas injection tests conducted in two distinct directions in the Underground Research Laboratory (URL) in Mol, are simulated in 2D plane stain state. The modelling finally provides information about the fracture structure and permeability evolution due to the excavation, and about the stress state during a second phase of pore pressures stabilization, and a last phase of gas migrations
-
Modèle 2nd gradient Thermo-Hydro-Mecanique pour étudier les processus de transferts de gas dans les milieux peu perméables
2019Co-Authors: Corman Gilles, Collin FrédéricAbstract:audience: researcher, professionalNowadays, the Deep Geological Disposal based on the multi-barriers confinement concept, is considered as one of the most promising solutions for the safe storage of radioactive wastes. Many Thermo-Hydro-Mechanical (THM) phenomena are likely to occur during the construction and the lifetime of the repository, which could alter the confining function of the different constituent layers. Among these, the underground excavation process tends to create a so-called Excavation Damaged Zone (EDZ) in the surrounding of the storage galleries, where the mechanical and hydraulic properties are affected [1]. For instance, the hydraulic permeability is increased compared to the sound rock formation. Moreover, during the exploitation of the system, a certain amount of gases, such as hydrogen could actually be generated in the nearfield of the repository due to the anoxic corrosion of the metal components, and could potentially lead to the alteration of the host rock behaviour. In light of this, the present work aims at developing a numerical tool within the finite element code LAGAMINE, able to reproduce simultaneously the development of strain localisation bands due to excavation and the multiphysical couplings associated with gas generation and migrations. This model includes on the one hand a THM part [2] to describe triphasic porous media under unsaturated and non-isothermal conditions. On the other hand, since the problem involving strain localisation is not well posed when modelled using classical medium, the local second gradient approach [3] is also integrated to the model. It helps avoiding the pathological mesh dependency by considering an enrichment of the continuum with microstructure effects through a regularizing internal length [4]. This model is subsequently used for reproducing two in situ gas injection tests (Experiments E4 and E5 performed in the framework of the MEGAS European project in the Underground Research Laboratory (URL) in Mol [5]) conducted in two distinct directions in the Boom Clay Formation, which is investigated by the Belgian National Radioactive Waste Management Agency (ONDRAF) as potential host rock for a Deep Geological Disposal. The 2D plain strain simulations provide information about the fracture structure and permeability evolution due to the excavation, and about the stress state during a phase of pore pressures stabilization, and during a last phase of gas migrations
-
Modèle 2nd gradient Thermo-Hydro-Mecanique pour étudier les processus de transferts de gas dans les milieux peu perméables
2019Co-Authors: Corman Gilles, Collin FrédéricAbstract:Nowadays, the Deep Geological Disposal based on the multi-barriers confinement concept, is considered as one of the most promising solutions for the safe storage of radioactive wastes. Many Thermo-Hydro-Mechanical (THM) phenomena are likely to occur during the construction and the lifetime of the repository, which could alter the confining function of the different constituent layers. Among these, the underground excavation process tends to create a so-called Excavation Damaged Zone (EDZ) in the surrounding of the storage galleries, where the mechanical and hydraulic properties are affected [1]. For instance, the hydraulic permeability is increased compared to the sound rock formation. Moreover, during the exploitation of the system, a certain amount of gases, such as hydrogen could actually be generated in the nearfield of the repository due to the anoxic corrosion of the metal components, and could potentially lead to the alteration of the host rock behaviour. In light of this, the present work aims at developing a numerical tool within the finite element code LAGAMINE, able to reproduce simultaneously the development of strain localisation bands due to excavation and the multiphysical couplings associated with gas generation and migrations. This model includes on the one hand a THM part [2] to describe triphasic porous media under unsaturated and non-isothermal conditions. On the other hand, since the problem involving strain localisation is not well posed when modelled using classical medium, the local second gradient approach [3] is also integrated to the model. It helps avoiding the pathological mesh dependency by considering an enrichment of the continuum with microstructure effects through a regularizing internal length [4]. This model is subsequently used for reproducing two in situ gas injection tests (Experiments E4 and E5 performed in the framework of the MEGAS European project in the Underground Research Laboratory (URL) in Mol [5]) conducted in two distinct directions in the Boom Clay Formation, which is investigated by the Belgian National Radioactive Waste Management Agency (ONDRAF) as potential host rock for a Deep Geological Disposal. The 2D plain strain simulations provide information about the fracture structure and permeability evolution due to the excavation, and about the stress state during a phase of pore pressures stabilization, and during a last phase of gas migrations
Corman Gilles - One of the best experts on this subject based on the ideXlab platform.
-
Modélisation numérique des expériences d'injection de gaz E4 et E5
Belgique Liège : Université de Liège, 2019Co-Authors: Corman Gilles, Collin FrédéricAbstract:Nowadays, the Deep Geological Disposal based on the multi-barriers confinement concept, is considered as one of the most promising solutions for the safe storage of radioactive wastes. Many Thermo-Hydro-Mechanical (THM) phenomena are likely to occur during the construction and the lifetime of the repository, which could alter the confining function of the different constituent layers. Among these, the underground excavation process tends to create a so-called Excavation Damaged Zone (EDZ) in the surrounding of the storage galleries, where the mechanical and hydraulic properties are affected. For instance, the hydraulic permeability is increased compared to the sound rock formation. Moreover, during the exploitation of the system, a certain amount of gases, such as hydrogen could actually be generated in the nearfield of the repository due to the anoxic corrosion of the metal components, and lead to the alteration of the host rock behaviour. In light of this, the present work aims at developing a numerical tool within the finite element code LAGAMINE1, able to reproduce simultaneously the development of strain localisation bands due to excavation, the multiphysical couplings associated with gas generation and migrations, as well as their possible close interactions. This model includes on the one hand a THM part to describe triphasic porous media under unsaturated and non-isothermal conditions. On the other hand, since the problem involving strain localisation is not well posed when modelled using classical mechanics, the local second gradient approach is also integrated to the model. It helps avoiding the pathological mesh dependency by considering an enrichment of the continuum with microstructure effects through a regularizing internal length. This model is subsequently put into practise for the case of Boom Clay Formation, investigated by the Belgian National Radioactive Waste Management Agency (ONDRAF) to host a Deep Geological Disposal. More particularly, two in situ gas injection tests conducted in two distinct directions in the Underground Research Laboratory (URL) in Mol, are simulated in 2D plane stain state. The modelling finally provides information about the fracture structure and permeability evolution due to the excavation, and about the stress state during a second phase of pore pressures stabilization, and a last phase of gas migrations
-
Modélisation numérique des expériences d'injection de gaz E4 et E5
Université de Liège, 2019Co-Authors: Corman Gilles, Collin FrédéricAbstract:audience: researcher, professionalNowadays, the Deep Geological Disposal based on the multi-barriers confinement concept, is considered as one of the most promising solutions for the safe storage of radioactive wastes. Many Thermo-Hydro-Mechanical (THM) phenomena are likely to occur during the construction and the lifetime of the repository, which could alter the confining function of the different constituent layers. Among these, the underground excavation process tends to create a so-called Excavation Damaged Zone (EDZ) in the surrounding of the storage galleries, where the mechanical and hydraulic properties are affected. For instance, the hydraulic permeability is increased compared to the sound rock formation. Moreover, during the exploitation of the system, a certain amount of gases, such as hydrogen could actually be generated in the nearfield of the repository due to the anoxic corrosion of the metal components, and lead to the alteration of the host rock behaviour. In light of this, the present work aims at developing a numerical tool within the finite element code LAGAMINE1, able to reproduce simultaneously the development of strain localisation bands due to excavation, the multiphysical couplings associated with gas generation and migrations, as well as their possible close interactions. This model includes on the one hand a THM part to describe triphasic porous media under unsaturated and non-isothermal conditions. On the other hand, since the problem involving strain localisation is not well posed when modelled using classical mechanics, the local second gradient approach is also integrated to the model. It helps avoiding the pathological mesh dependency by considering an enrichment of the continuum with microstructure effects through a regularizing internal length. This model is subsequently put into practise for the case of Boom Clay Formation, investigated by the Belgian National Radioactive Waste Management Agency (ONDRAF) to host a Deep Geological Disposal. More particularly, two in situ gas injection tests conducted in two distinct directions in the Underground Research Laboratory (URL) in Mol, are simulated in 2D plane stain state. The modelling finally provides information about the fracture structure and permeability evolution due to the excavation, and about the stress state during a second phase of pore pressures stabilization, and a last phase of gas migrations
-
Modèle 2nd gradient Thermo-Hydro-Mecanique pour étudier les processus de transferts de gas dans les milieux peu perméables
2019Co-Authors: Corman Gilles, Collin FrédéricAbstract:audience: researcher, professionalNowadays, the Deep Geological Disposal based on the multi-barriers confinement concept, is considered as one of the most promising solutions for the safe storage of radioactive wastes. Many Thermo-Hydro-Mechanical (THM) phenomena are likely to occur during the construction and the lifetime of the repository, which could alter the confining function of the different constituent layers. Among these, the underground excavation process tends to create a so-called Excavation Damaged Zone (EDZ) in the surrounding of the storage galleries, where the mechanical and hydraulic properties are affected [1]. For instance, the hydraulic permeability is increased compared to the sound rock formation. Moreover, during the exploitation of the system, a certain amount of gases, such as hydrogen could actually be generated in the nearfield of the repository due to the anoxic corrosion of the metal components, and could potentially lead to the alteration of the host rock behaviour. In light of this, the present work aims at developing a numerical tool within the finite element code LAGAMINE, able to reproduce simultaneously the development of strain localisation bands due to excavation and the multiphysical couplings associated with gas generation and migrations. This model includes on the one hand a THM part [2] to describe triphasic porous media under unsaturated and non-isothermal conditions. On the other hand, since the problem involving strain localisation is not well posed when modelled using classical medium, the local second gradient approach [3] is also integrated to the model. It helps avoiding the pathological mesh dependency by considering an enrichment of the continuum with microstructure effects through a regularizing internal length [4]. This model is subsequently used for reproducing two in situ gas injection tests (Experiments E4 and E5 performed in the framework of the MEGAS European project in the Underground Research Laboratory (URL) in Mol [5]) conducted in two distinct directions in the Boom Clay Formation, which is investigated by the Belgian National Radioactive Waste Management Agency (ONDRAF) as potential host rock for a Deep Geological Disposal. The 2D plain strain simulations provide information about the fracture structure and permeability evolution due to the excavation, and about the stress state during a phase of pore pressures stabilization, and during a last phase of gas migrations
-
Modèle 2nd gradient Thermo-Hydro-Mecanique pour étudier les processus de transferts de gas dans les milieux peu perméables
2019Co-Authors: Corman Gilles, Collin FrédéricAbstract:Nowadays, the Deep Geological Disposal based on the multi-barriers confinement concept, is considered as one of the most promising solutions for the safe storage of radioactive wastes. Many Thermo-Hydro-Mechanical (THM) phenomena are likely to occur during the construction and the lifetime of the repository, which could alter the confining function of the different constituent layers. Among these, the underground excavation process tends to create a so-called Excavation Damaged Zone (EDZ) in the surrounding of the storage galleries, where the mechanical and hydraulic properties are affected [1]. For instance, the hydraulic permeability is increased compared to the sound rock formation. Moreover, during the exploitation of the system, a certain amount of gases, such as hydrogen could actually be generated in the nearfield of the repository due to the anoxic corrosion of the metal components, and could potentially lead to the alteration of the host rock behaviour. In light of this, the present work aims at developing a numerical tool within the finite element code LAGAMINE, able to reproduce simultaneously the development of strain localisation bands due to excavation and the multiphysical couplings associated with gas generation and migrations. This model includes on the one hand a THM part [2] to describe triphasic porous media under unsaturated and non-isothermal conditions. On the other hand, since the problem involving strain localisation is not well posed when modelled using classical medium, the local second gradient approach [3] is also integrated to the model. It helps avoiding the pathological mesh dependency by considering an enrichment of the continuum with microstructure effects through a regularizing internal length [4]. This model is subsequently used for reproducing two in situ gas injection tests (Experiments E4 and E5 performed in the framework of the MEGAS European project in the Underground Research Laboratory (URL) in Mol [5]) conducted in two distinct directions in the Boom Clay Formation, which is investigated by the Belgian National Radioactive Waste Management Agency (ONDRAF) as potential host rock for a Deep Geological Disposal. The 2D plain strain simulations provide information about the fracture structure and permeability evolution due to the excavation, and about the stress state during a phase of pore pressures stabilization, and during a last phase of gas migrations
M Palmu - One of the best experts on this subject based on the ideXlab platform.
-
Implementing Geological Disposal of Radioactive Waste Technology Platform From the Strategic Research Agenda to its Deployment -12015
2020Co-Authors: Gerald Ouzounian, M Palmu, T Eng, France Chatenay-malabry, Finland Posiva Oy EurajokiAbstract:ABSTRACT Several European waste management organizations (WMOs) have initiated a technology platform for accelerating the implementation of Deep Geological Disposal of radioactive waste in Europe. The most advanced waste management programmes in Europe (i.e. Finland, Sweden, and France) have already started or are prepared to start the licensing process of Deep Geological Disposal facilities within the next decade
-
Development of the Strategic Research Agenda of the Implementing Geological Disposal of Radioactive Waste Technology Platform -11020
2020Co-Authors: M Palmu, Gerald OuzounianAbstract:ABSTRACT Several European waste management organizations have established a technology platform to accelerate the implementation of Deep Geological Disposal of radioactive waste in Europe. European waste management programmes in Sweden, Finland, and France are prepared to start the licensing process of Deep Geological Disposal facilities within this decade. A technology platform called Implementing Geological Disposal of Radioactive Waste (IGD-TP) was launched in November 2009. A vision report of the platform was prepared during 2008-2009 and it was presented at the Launch event in Brussels stating that "Our vision is that by 2025, the first Geological Disposal facilities for spent fuel, highlevel waste, and other long-lived radioactive waste will be operating safely in Europe." By the end of 2010 about sixty different organisations had joined the IGD-TP and committed to share its vision. The IGD-TP intends to constitute a tool for reducing overlapping work, to produce savings in total costs of research and implementation, and to make better use of existing competence and research infrastructures. A working group to develop a Strategic Research Agenda (SRA) for the IGD-TP was set up in January 2010. Intensive effort has been carried out to define and prioritize the key Research, Development and Demonstration (RD&D) topics that address the remaining scientific, technological and social challenges needed to support the realization of the vision. In the work process, a methodology for coming up with the Key Topics in RD&D was developed and a seminar for all committed participants of the IGD-TP was organised to ensure that relevant input from the Deep Geological Disposal community was taken into account in the work. The SRA document is published after an open consultation in early 2011. This paper presents the development of this SRA. Despite the differences between the timing and the challenges of the different waste management programmes, there is a joint awareness that cooperation on the scientific, technical, and social challenges related to Geological Disposal is needed, and the cooperation will be beneficial for the timely and safe implementation of the first Geological Disposal facilities
-
towards an implementing Geological Disposal technology platform in europe
Mineralogical Magazine, 2012Co-Authors: M Palmu, T Eng, T M BeattieAbstract:Several European waste management organizations have started work on creating a technology platform to accelerate the implementation of Deep Geological Disposal of radioactive waste in Europe. There is an increasing consensus in the international community about Geological Disposal as the preferred option for solving the long-term management of spent fuel, high-level waste and other long-lived radioactive wastes. At the same time, European citizens have a widespread desire for a permanent solution for high-level radioactive waste Disposal. A majority of European countries with nuclear power have active waste-management programmes, but the current status and the main challenges of those programmes vary. The most advanced waste management programmes in Europe (i.e. those in Sweden, Finland and France) are prepared to start the licensing process of Deep Geological Disposal facilities within the next decade. Despite the differences between the timing and the challenges of the different programmes, there is a joint awareness that cooperation on the scientific, technical and social challenges related to Geological Disposal is needed, and that it is beneficial for the timely and safe implementation of the first Geological Disposal facilities. Such a demonstration of a viable solution for the management of high-level radioactive waste will enhance stakeholder confidence in Europe. It is envisaged that a technology platform would enhance European cooperation in this area. The platform will provide a tool for reducing overlapping work, to produce savings in total costs of research and implementation, and to make better use of existing competence and research infrastructures. From 2008, SKB (Sweden) and Posiva (Finland) led the preparation work to set up the implementing Geological Disposal of radioactive waste technology platform (IGD-TP). Since then other implementers from France, Germany, Switzerland, United Kingdom, Spain and Belgium have joined the project. To date a strategic research agenda for the platform has been prepared and consulted upon, which is now the basis for taking the platform into a deployment phase.
-
implementing Geological Disposal of radioactive waste technology platform from the strategic research agenda to its deployment 12015
2012Co-Authors: Gerald Ouzounian, M PalmuAbstract:Several European waste management organizations (WMOs) have initiated a technology platform for accelerating the implementation of Deep Geological Disposal of radioactive waste in Europe. The most advanced waste management programmes in Europe (i.e. Finland, Sweden, and France) have already started or are prepared to start the licensing process of Deep Geological Disposal facilities within the next decade. A technology platform called Implementing Geological Disposal of Radioactive Waste Technology Platform (IGD-TP) was launched in November 2009. A shared vision report for the platform was published stating that: "Our vision is that by 2025, the first Geological Disposal facilities for spent fuel, high-level waste, and other long-lived radioactive waste will be operating safely in Europe." In 2011, the IGD-TP had eleven WMO members and about 70 participants from academia, research, and the industry committed to its vision. The IGD-TP has started to become a tool for reducing overlapping work, to produce savings in total costs of research and implementation and to make better use of existing competence and research infrastructures. The main contributor to this is the deployment of the IGD-TP's newly published Strategic Research Agenda (SRA). The work undertaken for the SRA defined the pending research, development and demonstration (RD&D) issues and needs. The SRA document describing the identified issues that could be worked on collaboratively was published in July 2011. It is available on the project’s public website (www.igdtp.eu). The SRA was organized around 7 Key Topics covering the Safety Case, Waste forms and their behaviour, Technical feasibility and long-term performance of repository components, Development strategy of the repository, Safety of construction and operations, Monitoring, and Governance and stakeholder involvement. Individual Topics were prioritized within the Key Topics. Cross-cutting activities like Education & Training or Knowledge Management as well as activities remaining specific for the WMOs were as well identified in the document. For example, each WMO has to develop their own waste acceptance rules, and plan for the economics and the funding of their waste management programmes.
-
development of the strategic research agenda of the implementing Geological Disposal of radioactive waste technology platform 11020
2011Co-Authors: M Palmu, Gerald OuzounianAbstract:Several European waste management organizations have established a technology platform to accelerate the implementation of Deep Geological Disposal of radioactive waste in Europe. European waste management programmes in Sweden, Finland, and France are prepared to start the licensing process of Deep Geological Disposal facilities within this decade. A technology platform called Implementing Geological Disposal of Radioactive Waste (IGD-TP) was launched in November 2009. A vision report of the platform was prepared during 2008-2009 and it was presented at the Launch event in Brussels stating that "Our vision is that by 2025, the first Geological Disposal facilities for spent fuel, highlevel waste, and other long-lived radioactive waste will be operating safely in Europe." By the end of 2010 about sixty different organisations had joined the IGD-TP and committed to share its vision. The IGD-TP intends to constitute a tool for reducing overlapping work, to produce savings in total costs of research and implementation, and to make better use of existing competence and research infrastructures.
T M Beattie - One of the best experts on this subject based on the ideXlab platform.
-
towards an implementing Geological Disposal technology platform in europe
Mineralogical Magazine, 2012Co-Authors: M Palmu, T Eng, T M BeattieAbstract:Several European waste management organizations have started work on creating a technology platform to accelerate the implementation of Deep Geological Disposal of radioactive waste in Europe. There is an increasing consensus in the international community about Geological Disposal as the preferred option for solving the long-term management of spent fuel, high-level waste and other long-lived radioactive wastes. At the same time, European citizens have a widespread desire for a permanent solution for high-level radioactive waste Disposal. A majority of European countries with nuclear power have active waste-management programmes, but the current status and the main challenges of those programmes vary. The most advanced waste management programmes in Europe (i.e. those in Sweden, Finland and France) are prepared to start the licensing process of Deep Geological Disposal facilities within the next decade. Despite the differences between the timing and the challenges of the different programmes, there is a joint awareness that cooperation on the scientific, technical and social challenges related to Geological Disposal is needed, and that it is beneficial for the timely and safe implementation of the first Geological Disposal facilities. Such a demonstration of a viable solution for the management of high-level radioactive waste will enhance stakeholder confidence in Europe. It is envisaged that a technology platform would enhance European cooperation in this area. The platform will provide a tool for reducing overlapping work, to produce savings in total costs of research and implementation, and to make better use of existing competence and research infrastructures. From 2008, SKB (Sweden) and Posiva (Finland) led the preparation work to set up the implementing Geological Disposal of radioactive waste technology platform (IGD-TP). Since then other implementers from France, Germany, Switzerland, United Kingdom, Spain and Belgium have joined the project. To date a strategic research agenda for the platform has been prepared and consulted upon, which is now the basis for taking the platform into a deployment phase.
Christelle Martin - One of the best experts on this subject based on the ideXlab platform.
-
use of nanoprobes to identify iron silicates in a glass iron argillite system in Deep Geological Disposal
Corrosion Science, 2019Co-Authors: Yannick Linard, Delphine Neff, Charly Carriere, Philippe Dillmann, Eddy Foy, James J Dynes, Nicolas Michau, Christelle MartinAbstract:Abstract The understanding of glass alteration mechanisms in contact with iron is a major issue to study the long-term behavior of radioactive waste package in repository conditions. A glass/iron/claystone system was altered in contact with COx water at 50 °C for 4.5 years in Andra's underground research laboratory in Bure, France. Multiscale and multitechnical (SEM-EDX, μRaman, STXM and TEM) characterization of the system revealed the presence of nanometric crystalline Fe(III)-rich smectite, assimilated to nontronite, in the glass alteration layer and in corrosion products. These phyllosilicates were identified by STXM using a comparative approach with a database of reference spectra obtained on iron-silicate.
-
key phenomena governing hlw glass behavior in the french Deep Geological Disposal
MRS Proceedings, 2015Co-Authors: Stephan Schumacher, Abdesselam Abdelouas, Christelle Martin, Yannick Linard, Frederic Angeli, Delphine Neff, Xavier CrozesAbstract:According to the Planning Act of 28th June 2006, Andra is in charge of ensuring the sustainable management of all radioactive waste generated in France, especially the high-level and long-lived vitrified waste produced from spent fuel recycling. Since 2006, all the studies and research related to the components of HLW cells have been incorporated into a broader R&D program which aims at characterizing and modeling (i) the glass matrix dissolution, (ii) the corrosion of the overpack and the lining, and (iii) the claystone evolution in the near field, considering all the interactions between these surrounding materials. This program, coordinated by Andra, has involved up to eighteen laboratories. After closure of Disposal cells and overpack failure, glass alteration is expected to begin in partially saturated conditions due to hydrogen production resulting from carbon steel corrosion in anoxic conditions. Therefore, the glass should at least partially be hydrated by water vapor during thousands of years until complete saturation. A part of the studies aimed to determine the glass behavior in such conditions, the influence of the main parameters (temperature, relative humidity) and consequences of vapor hydration on subsequent radionuclides release by water leaching. In addition, the major part of the work focused on the influence of the environment on glass alteration. The effect of clay pore water on glass alteration rates (initial rate, rate drop and residual rate) was determined and particularly that of pH and magnesium. The nature of steel corrosion products and their interactions with glass alteration were also investigated. All these studies relied on experiments in surface laboratories, in Andra’s underground laboratory, together with natural or archeological analogs and modeling studies.
-
corrosion of carbon steel under sequential aerobic anaerobic environmental conditions
Corrosion Science, 2013Co-Authors: El H Hajj, Abdesselam Abdelouas, Bernd Grambow, El Y Mendili, Gokhan Karakurt, Christelle MartinAbstract:We investigated sequential aerobic and anaerobic microbiologically induced corrosion of carbon steel to simulate Deep Geological Disposal conditions. Under limited oxygen supply, lepidocrocite and magnetite corrosion products formed on the steel coupon, while under continuous oxygen supply, a mixture of lepidocrocite, maghemite and magnetite was identified. Upon oxygen consumption and establishment of sulphidogenic conditions, due to sulphate-reducing bacteria activity, all these oxides disappeared via transformation into pyrrhotite. Corrosion rate of steel in direct anaerobic cultures was higher than that of steel initially corroded in aerobic condition, suggesting a protective role of corrosion product layer formed under sequential aerobic–anaerobic conditions.
