A5041653184- Groundwater flow and contamination studies
- Rock Mechanics and Modeling
- Nuclear and radioactivity studies
- Soil and Unsaturated Flow
- CO2 Sequestration and Geologic Interactions
- Hydraulic Fracturing and Reservoir Analysis
- Nuclear reactor physics and engineering
- Concrete and Cement Materials Research
- Geological Modeling and Analysis
- Drilling and Well Engineering
- Reservoir Engineering and Simulation Methods
- Graphite, nuclear technology, radiation studies
- Geophysical Methods and Applications
- Nuclear materials and radiation effects
- Seismology and Earthquake Studies
- Heat and Mass Transfer in Porous Media
- Hybrid Renewable Energy Systems
- Computational Fluid Dynamics and Aerodynamics
- Geotechnical and Geomechanical Engineering
- Spacecraft and Cryogenic Technologies
- Computational Physics and Python Applications
- Probabilistic and Robust Engineering Design
- Data Visualization and Analytics
- Integrated Energy Systems Optimization
- Landslides and related hazards
Federal Institute for Geosciences and Natural Resources
2021-2024
In this paper, the governing equations of non-isothermal two-phase flow in unsaturated, deformable porous media are presented based on different representations gaseous phase along with their implementations open-source FEM code OpenGeoSys 6. As one implementation utilises Richards equation to represent unsaturated system whereas second relies a two-component formulation, impact free model predictions is illustrated by series tests increasing complexity, motivated similar investigations Task...
Abstract The Federal Company for Radioactive Waste Disposal (BGE mbH) is tasked with the selection of a site high-level radioactive waste repository in Germany accordance Repository Site Selection Act. In September 2020, 90 areas favorable geological conditions were identified as part step 1 phase Representative preliminary safety analyses are to be carried out next support decisions on question, which siting regions should undergo surface-based exploration. These supported by numerical...
Abstract In this paper, thermo-hydro-mechanically (THM) coupled processes triggered during the construction, operation and closure of a deep geological repository for heat generating, high level radioactive waste are discussed based on generic disposal concept. For purpose, we using numerical non-isothermal two-phase–two-component flow in deformable porous media (TH 2 M) implementation (Grunwald et al. Geomech Geophys Geo-energy Geo-resour, 2022) open-source software OpenGeoSys (Bilke...
This study explores the quantification of uncertainties in integrity assessments geological barriers repository systems, which is a crucial aspect required by German law (§5 Endlagersicherheitsanforderungsverordnung (EndlSiAnfV)). The analysis includes numerical approximations thermally-hydraulically-mechanically coupled processes. legal framework necessitates documentation impact on safety-oriented evaluations, thereby requiring systematic investigation simulated results from...
The search for a repository site and its design rely on digital models simulations. An integral part of the selection process is assessment integrity containment-providing rock zone. Computational assessing geological barriers in systems often yield complex results typically accessible only to experts these disciplines. extra layer complexity added by considering input uncertainties. As site-selection progresses, it becoming increasingly important make this kind broader audience support...
An internationally accepted concept for the long-term containment of spent high-level nuclear waste (HLW) is its disposal using deep geological repositories. Therefore, need arises to evaluate safety and efficiency under-ground storage regarding among others radionuclide transport mechanisms. For this purpose, numerical modeling an essential powerful tool. This BGR contribution focuses on performance assessment a generic repository in crystalline rock done within framework DECOVALEX-2023...
Safe deep geological disposal of heat-generating nuclear waste requires an accurate assessment barrier integrity. Therefore, the evaluation coupled mechanical, hydraulic, thermal and chemical processes, occurring in host rock due to storage, excavation among others is needed. For this purpose, numerical modeling essential powerful tool. This contribution focuses on a generic repository system that relies Containment Providing Rock Zone (CRZ) crystalline rock, which acts as principal...
<p>Numerical studies on integrity of the geological barriers in heat generating radioactive waste disposal remain a challenging topic involving modelling thermal, hydraulic and mechanical (THM) processes within complex geometries, as well particularly long simulation time intervals . Due to this, unfeasible computational complexity emerges for many three-dimensional problems, resulting need further model assumptions simplification types simulation. To make use results such...
Abstract In this paper, thermo-hydro-mechanically (THM) coupled processes triggered during the construction, operation and closure of a deep geological repository for heat generating, high level radioactive waste are discussed based on generic disposal concept.For purpose we using numerical non-isothermal two-phase-two-component flow in deformable porous media (\th2m) implementation \cite{Grunwald2022} open-source software OpenGeoSys \cite{Bilke2019337}.THM effects covered work focus single...
Within the ANSICHT project, BGE Technology, BGR, and Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) developed a safety assessment methodology for high-level radioactive waste repository in clay formations based on German legal requirements. This included quantification of integrity criteria their exemplary numerical evaluation by THM-modeling. In project's second phase, modeling concept was extended detailed near-field model initial attempts were made to quantify uncertainty....
Crystalline rock is one of the potential rocks under consideration in Germany for hosting a heat-generating nuclear waste repository. The focus this contribution repository system, which relies on Containment Providing Rock Zone (CRZ) crystalline as principal containment barrier. In compliance with German safety requirements, integrity CRZ required, i.e. to keep its capabilities period 1 million years. This implies that formation new pathways must be excluded, temperature development not...
Abstract. The simulation of thermal, hydraulic, and mechanical coupled processes can be a decisive factor in the integrity assessment geotechnical geological barriers. Modelling decisions, such as representation heterogeneity constitutive models used, significantly impact outcome (Wagener Pianosi, 2019). Furthermore, numerical inputs to simulation, i.e. material parameters boundary conditions, are subject uncertainty. This results lower confidence level outcome, even if overall framework is...
Abstract. The thermal, hydraulic, and mechanical effects of excavating the repository mine thermal loading nuclear waste on safety geological barrier system are addressed in regulations as integrity analyses. For repositories clay rock, a modelling assessment methodology has been developed ANSICHT (Methodik und Anwendungsbezug eines Sicherheits- Nachweiskonzeptes für ein HAW-Endlager im Tonstein) project based thermo-hydro-mechanically (THM) coupled simulations using open-source software...
Abstract. Since a sufficiently large undisturbed rock zone to provide the essential safety function for containment of radioactive waste cannot be assumed in crystalline rock, concept disposal multiple smaller unfractured volumes has been developed and investigated joint research project CHRISTA-II (Thiedau et al., 2021). This repository concept, which relies on host as an barrier disposed radionuclides, thus requires existence areas. Integrity evaluation geological part assessment comprises...
Abstract. For the underground disposal of high-level nuclear waste in rock salt formations, safety concept includes backfilling open cavities with crushed salt. prognosis sealing function backfill for safe containment radioactive waste, it is crucial to have a comprehensive process understanding crushed-salt compaction behavior. The influenced by internal properties (e.g., grain size, mineralogy, and moisture content) boundary conditions temperature, stress state, rate) and, therefore,...
ABSTRACT Crushed salt may be used as backfill material and sealing measures of open cavities, drifts shafts in nuclear waste repositories located rock formations. The host will gradually compact the crushed over time due to creep. A comprehensive understanding compaction process is essential, yet involves several thermal-hydraulic-mechanical (THM) coupled processes influenced by internal, well external conditions. current has some important knowledge gaps. For example, porosity/permeability...