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Modelling the Prototype Repository

View ORCID ProfileV. Tsitsopoulos, View ORCID ProfileS. Baxter, D. Holton, J. Dodd, S. Williams and S. Thompson
Geological Society, London, Special Publications, 482, 241-260, 7 December 2018, https://doi.org/10.1144/SP482.15
V. Tsitsopoulos
1Wood, Building 150, Harwell Oxford, Didcot, UK
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S. Baxter
1Wood, Building 150, Harwell Oxford, Didcot, UK
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D. Holton
1Wood, Building 150, Harwell Oxford, Didcot, UK
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J. Dodd
1Wood, Building 150, Harwell Oxford, Didcot, UK
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S. Williams
1Wood, Building 150, Harwell Oxford, Didcot, UK
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S. Thompson
2Radioactive Waste Management Limited, Building 587, Harwell Oxford, Didcot, UK
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Abstract

The Prototype Repository (PR) tunnel is located at the Äspö Hard Rock Laboratory near Oskarshamn in the southeast of Sweden. In the PR tunnel, six full-sized deposition holes (8.37 m deep and 1.75 m in diameter) have been constructed. Each deposition hole is designed to mimic the Swedish reference system for the disposal of nuclear fuel, KBS-3V. The PR experiment is designed to provide a full-scale simulation of the emplacement of heat-generating waste. There are three phases to the experiment: (1) the open tunnel phase following construction, where both the tunnel and deposition holes are open to atmospheric conditions; (2) the emplacement of canisters (containing heaters), backfill and seal in the first section of the tunnel; and (3) the emplacement of canisters, backfill and seal in the second section of the tunnel. This work describes the numerical modelling, performed as part of the engineered barrier systems (EBS) Task Force, to understand the thermo-hydraulic (TH) evolution of the PR experiment and to provide a better understanding of the interaction between the fractured rock and bentonite surrounding the canister at the scale of a single deposition tunnel. A coupled integrated TH model for predicting the wetting and the temperature of bentonite emplaced in fractured rock was developed, accounting for the heterogeneity of the fractured rock. In this model, geometrical uncertainties of fracture locations are modelled by using several stochastic realizations of the fracture network. The modelling methodology utilized information available at early stages of site characterization and included site statistics for fracture occurrence and properties, as well as proposed installation properties of the bentonite. The adopted approach provides an evaluation of the predictive capability of models, it gives an insight of the uncertainties to data and demonstrates that a simplified equivalent homogeneous description of the fractured host rock is insufficient to represent the bentonite resaturation.

  • © 2018 Nuclear Decommissioning Authority. Published by The Geological Society of London. All rights reserved
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Geological Society, London, Special Publications: 482 (1)
Geological Society, London, Special Publications
Volume 482
2019
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Modelling the Prototype Repository

V. Tsitsopoulos, S. Baxter, D. Holton, J. Dodd, S. Williams and S. Thompson
Geological Society, London, Special Publications, 482, 241-260, 7 December 2018, https://doi.org/10.1144/SP482.15
V. Tsitsopoulos
1Wood, Building 150, Harwell Oxford, Didcot, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for V. Tsitsopoulos
  • For correspondence: v.tsitsopoulos@woodplc.com
S. Baxter
1Wood, Building 150, Harwell Oxford, Didcot, UK
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  • ORCID record for S. Baxter
D. Holton
1Wood, Building 150, Harwell Oxford, Didcot, UK
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J. Dodd
1Wood, Building 150, Harwell Oxford, Didcot, UK
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S. Williams
1Wood, Building 150, Harwell Oxford, Didcot, UK
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S. Thompson
2Radioactive Waste Management Limited, Building 587, Harwell Oxford, Didcot, UK
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Modelling the Prototype Repository

V. Tsitsopoulos, S. Baxter, D. Holton, J. Dodd, S. Williams and S. Thompson
Geological Society, London, Special Publications, 482, 241-260, 7 December 2018, https://doi.org/10.1144/SP482.15
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  • Article
    • Abstract
    • PR experiment
    • Modelling methodology
    • Geometric model description
    • DFN modelling of the PR-tunnel deposition hole inflow
    • Upscaling the DFN model to an ECPM model
    • Modelling of phases 1–3
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