Modeling transient heat transfer in nuclear waste repositories

Yang, Shaw Yang; Yeh, Hund‐Der

doi:10.1016/j.jhazmat.2009.03.068

Cited by 11 publications

(5 citation statements)

References 17 publications

(18 reference statements)

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“…In this way, while some small fraction of water could still be present, in this study 1), we replicate dry conditions similar to those expected during the operation of the nuclear waste repository (Heierli & Genoni, 2017;Yang & Yeh, 2009) and 2) we have ensured that any thermal damage to the mineral grains was avoided (Rutter & Mecklenburgh, 2018). In this way, while some small fraction of water could still be present, in this study 1), we replicate dry conditions similar to those expected during the operation of the nuclear waste repository (Heierli & Genoni, 2017;Yang & Yeh, 2009) and 2) we have ensured that any thermal damage to the mineral grains was avoided (Rutter & Mecklenburgh, 2018).…”

Section: Methodsmentioning

confidence: 57%

“…Samples were first dried for 48 hr at 50°. In this way, while some small fraction of water could still be present, in this study 1), we replicate dry conditions similar to those expected during the operation of the nuclear waste repository (Heierli & Genoni, 2017;Yang & Yeh, 2009) and 2) we have ensured that any thermal damage to the mineral grains was avoided (Rutter & Mecklenburgh, 2018). For wet experiments, 5 g of dried powdered OPA was mixed with~2.5 mL of deionized water to make a paste (Lockner et al, 2011;Tembe et al, 2010).…”

Section: Methodsmentioning

confidence: 87%

“…Indeed, temperature can exceed 50-70°C for long periods of times (~10,000 years) in the surroundings (~10 m) of the heating source (Heierli & Genoni, 2017;Yang & Yeh, 2009), leading to temperature gradients and dehydration processes (Buscheck et al, 2002), which will tend to dry the rock, create pore overpressures, and change the natural permeability of the host-rock (Tsang et al, 2012). Indeed, temperature can exceed 50-70°C for long periods of times (~10,000 years) in the surroundings (~10 m) of the heating source (Heierli & Genoni, 2017;Yang & Yeh, 2009), leading to temperature gradients and dehydration processes (Buscheck et al, 2002), which will tend to dry the rock, create pore overpressures, and change the natural permeability of the host-rock (Tsang et al, 2012).…”

mentioning

confidence: 99%

“…Furthermore, during the operation of the DGR, heating generated from high-level nuclear waste can affect the host-rock and adjacent fault systems. Indeed, temperature can exceed 50-70°C for long periods of times (~10,000 years) in the surroundings (~10 m) of the heating source (Heierli & Genoni, 2017;Yang & Yeh, 2009), leading to temperature gradients and dehydration processes (Buscheck et al, 2002), which will tend to dry the rock, create pore overpressures, and change the natural permeability of the host-rock (Tsang et al, 2012).…”

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confidence: 99%

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Contrasting Mechanical and Hydraulic Properties of Wet and Dry Fault Zones in a Proposed Shale‐Hosted Nuclear Waste Repository

Orellana

Giorgetti

Violay

2019

Geophysical Research Letters

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The underground disposal of high‐level nuclear waste is a pressing issue for several countries. In Switzerland, the Opalinus Clay formation is a shale with favorable barrier properties. However, small‐to‐large faults intersecting the formation bring the long‐term integrity of the future repositories into question. Here we present the first systematic laboratory study on the frictional strength, stability, dilatancy, and permeability of simulated Opalinus Clay gouge under typical repository conditions. Wet gouges exhibit an extremely low coefficient of friction (μf~0.16), velocity‐strengthening behavior, and shear‐enhanced dilatancy at the onset of slip, and permeability increase. Conversely, dry gouges remain weak (μf~0.36) but exhibit a transition from unstable to stable sliding with increasing sliding velocity. Thus, we infer that faults hosted in Opalinus Clay could be easily reactivated via aseismic creep, possibly acting as poor fluid conduits. However, if temporarily dried, the faults become potentially unstable, at least, at low sliding velocities (<~10 μm/s).

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Section: Methodsmentioning

confidence: 57%

Section: Methodsmentioning

confidence: 87%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Contrasting Mechanical and Hydraulic Properties of Wet and Dry Fault Zones in a Proposed Shale‐Hosted Nuclear Waste Repository

Orellana

Giorgetti

Violay

2019

Geophysical Research Letters

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“…Thus heat propagates mainly by conduction in a geologic repository. Several appropriate local-scale models are developed to investigate the heat transfer or thermo-mechanical interaction around the central canister [6][7][8][9][10][11][12][13][14][15][16]. Although multiple barriers consisting of the container, buff, backfill and rock can be considered, these local-scale models are only available for the symmetrical position at any time scale or asymmetrical region at short-term scale.…”

Section: Introductionmentioning

confidence: 99%

Thermoelastic analysis of a geological repository with distributed decay heat sources by the image method in combination with a numerical integration scheme

Liu

Xiang

2020

E3S Web Conf.

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The disposal of nuclear waste involves thermo-mechanical reaction of the host rock to the buried waste – a distributed heat source that decays. To solve the problem within the half infinite space confined by the ground surface, an image method is developed. Specifically, a negative image of the heat source with the ground surface as the mirror, i.e. a mirrored heat sink is utilized so that the normal traction generated by the heat source can be counterbalanced, and a numerical scheme of integration of the classical Cerruti solution is developed to include the effect of tangential shear traction on the ground surface caused by the heat sources and their mirrored sinks. For a conceptual repository model, large thermal shear stress, tensile stress, and deformation occur at the corner, between adjacent drifts, and at the boundary of the repository area, respectively. For a prescribed thermal loading, it is more efficient to mitigate the thermo-mechanical effects through enlarging the pit spacing than increasing the drift spacing.

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An analytical solution for describing the transient temperature distribution in an aquifer thermal energy storage system

Yang

Yeh

2010

Hydrological Processes

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Abstract:A mathematical model is developed for predicting the temperature distribution in an aquifer thermal energy storage (ATES) system, which consists of a confined aquifer bounded from above and below by the rocks of different geological properties. The main transfer processes of heat include the conduction and advection in the aquifer and the conduction in the rocks. The semi-analytical solution in dimensionless form for the model is developed by Laplace transforms and its corresponding time-domain solution is evaluated by the modified Crump method. Field geothermal property data are used to simulate the temperature distribution in an ATES system. The results show that the heat transfer in the aquifer is fast and has a vast effect on the vicinity of the wellbore. However, the aquifer temperature decreases with increasing radial and vertical distances. The temperature in the aquifer may be overestimated when ignoring the effect of thermal conductivity. The temperature distribution in an ATES system depends on the vertical thermal conduction in the rocks and the horizontal advection and thermal conduction in the aquifer. The present solution is useful in designing and simulating the heat injection facility in the ATES systems.

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Modeling transient heat transfer in nuclear waste repositories

Cited by 11 publications

References 17 publications

Contrasting Mechanical and Hydraulic Properties of Wet and Dry Fault Zones in a Proposed Shale‐Hosted Nuclear Waste Repository

Contrasting Mechanical and Hydraulic Properties of Wet and Dry Fault Zones in a Proposed Shale‐Hosted Nuclear Waste Repository

Thermoelastic analysis of a geological repository with distributed decay heat sources by the image method in combination with a numerical integration scheme

An analytical solution for describing the transient temperature distribution in an aquifer thermal energy storage system

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