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DECOVALEX 2015 - ABOUT

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Major T, H, M, and C perturbations of engineered and natural barriers during lifetime of a geologic repository (from Sillen, HADES Symposium, 2011). Selected coupling effects between T, H, M, and C processes. Concluded between 1992 and 2011, DECOVALEX-2015. To support development of numerical simulators for THM and THMC processes in geological systems. To investigate and implement suitable algorithms for THM and THMC modelling. To design new experiments to support code and model development. JAEA: Japan ...

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DECOVALEX 2015 - PAST PHASES - D-2011

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Increasing the basic understanding of coupled THMC processes in fractured rocks (crystalline and argillaceous) and buffer materials;. Investigating the predictive capabilities of different codes for field experiments and to perform verification of codes;. Exchanging experimental data, and improving the understanding of the constitutive behaviour of crystalline and argillaceous rock masses and buffer materials;. Performing THMC calculations in a performance assessment context; and. J A Hudson and L. J...

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DECOVALEX 2015 - PAST PHASES - D-THMC

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The main objectives of DECOVALEX THMC were the study of THMC processes important for PA and SA and the investigation of EDZ. This phase consisted of four BMT's and 1 TC's. A BMT is a Benchmark Test in which the output of different computer codes are compared for a particular problem. A TC is a Test Case in which the output of one or more computer programs are compared against reality. BMT1: influence of near-field THM couplings on PA (Task A). THM analysis of a near field hypothetical repository. Infiltr...

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DECOVALEX 2015 - RESOURCES

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Christopher Ian McDermott, Alexander Bond, Andrew Fraser Harris, Neil Chittenden, Kate Thatcher: Application of hybrid numerical and analytical solutions for the simulation of coupled thermal, hydraulic, mechanical and chemical processes during fluid flow through a fractured rock. Environ Earth Sci (2015) 74: 7837. doi:10.1007/s12665-015-4769-9. Kate Elizabeth Thatcher, Alexander Bond, Simon Norris: Engineered damage zone sealing during a water injection test at the Tournemire URL. Environ Earth Sci ...

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DECOVALEX 2015 - TASK C1

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The coupling of thermal, hydraulic, mechanical and chemical (THMC) processes for fractured rocks is an extremely complex area of scientific research that may have a significant bearing on the potential design and performance of radioactive waste disposal facilities. The purpose of Task C1 under DECOVALEX-2015 is to:. Experimental configuration for the novaculite experiment (redrawn from Yasuhara et al 2006). The current plan of the task includes 7 distinct steps, the focus being initially on the novaculi...

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DECOVALEX 2015 - TASK C2

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Bedrichov Tunnel Test Case. The general aim of the model and data is to understand the water behaviour in the massif distribution, movement, quality, reactions, etc. The first part of the study is to understand the flow distribution, followed by conservative transport and reactive transport. The task thus addresses relevant issues related to modeling the long-term radionuclide transport in fractured hard rocks. The third step, reactive transport modelings, has a similar sequence, from fitting the laborat...

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DECOVALEX 2015

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Upled models and their VAL. Example modeling task from DECOVALEX III: The Drift Scale Test (DST) experiment, conducted by DOE: A set of 9 large heaters and 50 smaller wing heaters set in unsaturated tuff; no backfill. Monitoring in the rock includes measurements not only of temperatures and displacement, but also saturation, effective hydraulic conductivity, and water samples for chemical and isotopic studies. Figures for HE-E (left) and EBS Experiment (right). Task A: The SEALEX Experiment. Task B.2...

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DECOVALEX 2015 - TASK A

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The generic layout of the in situ experiments consists of several components inserted in a horizontal large diameter borehole excavated in the Tournemire argillite:. The swelling clay core (MX80 bentonite based) is sandwiched between two porous plates (e.g. sintered steel filter or porous ceramic);. The upstream plate is in direct contact with host-rock while the downstream one is retained by a confining system (referred to as a confining plug) maintaining a constant volume condition;. One in situ test (...

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DECOVALEX 2015 - PAST PHASES - D-III

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An additional Task 4 was also organized to present the status at that time of the current understanding of the impacts and treatments of the THM issues on performance assessment (PA) and safety assessment (SA) of nuclear waste repositories, from the views of the Funding organizations of the DECOVALEX project, through compilation of answers to a questionnaire prepared for this purpose. The tasks were coordinated by the following coordinators:. Task 4 by J. Andersson (Streamflow AB, Sweden). Institute for ...

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DECOVALEX 2015 - PAST PHASES - D-II

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The overall objective of the DECOVALEX II project was to increase the understanding of various coupled THM processes of importance for radionuclide release and transport from a repository to thebiosphere and how they can be described by mathematical models, with focus on large scale in-situ experiments. An additional objective was to evaluate how studies conducted in the DECOVALEX I and DECOVALEX II projects could be used for design and performance assessment of radioactive waste repositories. Production...