An Analysis of the Thermal and Mechanical Behavior of Engineered Barriers in a High-Level Radioactive Waste Repository

Kwon, Soonjo; Cho, W.J.; Lee, Jae-Owan

doi:10.5516/net.06.2012.015

Cited by 22 publications

(8 citation statements)

References 8 publications

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“…One of the main issues and improvements of the THME model presented in this paper was the introduction of a damaged zone, the so-called excavation-disturbed zone (EDZ) of rock material created by the application of the drilling and blasting method for the construction of underground spaces. EDZ is usually not considered in THME simulations due to the simplification of a problem in order to facilitate numerical modelling (Åkesson i dr., 2010;Chen et al, 2012;Kwon et al, 2013;Rutqvist et al, 2005;Toprak et al, 2012;Toprak et al, 2013;Zhao et al, 2014). However, EDZ is one of the most significant parts of the model, since it represents a preferable pathway for underground water and radionuclide transport.…”

Section: Discussionmentioning

confidence: 99%

“…The drilling of short vertical boreholes for the emplacement of canisters will probably be carried out by the blind-hole drilling method (Autio & Kirkkomäki, 1996). EDZ is readily omitted in numerical modelling of this type (THME modelling), most probably due to the complexity of the models and the duration of calculations (Åkesson i dr., 2010;Chen et al, 2012;Kwon et al, 2013;Rutqvist et al, 2005;Toprak et al, 2013;Zhao et al, 2014). However, the EDZ is one of the most important elements of disposal concept/technology.…”

Section: Selected Conceptmentioning

confidence: 99%

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Thermo-Hydro-Mechanical Effects on Host Rock for a Generic Spent Nuclear Fuel Repository

Veinović¹,

Uroić²,

Domitrović³

et al. 2020

MGPB

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After the adoption of the National Program for the Implementation of the Strategy for the Management of Radioactive Waste Used Resources and Spent Nuclear Fuel, by the Government of the Republic of Croatia, the issue of radioactive waste management in Croatia became current. Slovene-Croatian co-ownership over the Krško nuclear power plant (KNPP) means that half of the operational and decommissioning waste, as well as spent nuclear fuel (SNF) belongs to Croatia. Until now, SNF has been kept in a pool at KNPP, and dry storage before disposal is also planned. A generic project of a SNF repository has been developed and has already undergone a second revision and review. The project idea involves site selection in both countries and the conceptual solution of the SKB-3V type in crystalline rock. This paper presents an estimate of the thermal-hydro-mechanical effects (THME) of the SNF repository in crystalline rock (granodiorite) of SKB-3V concept by developing a numerical model in the SIGMA/W, SEEP/W and TEMP/W software. Simulations have shown that it is possible to construct a SNF repository in the crystalline rocks of Croatia or Slovenia, that the generic repository project is well-designed and that a model of hydro-thermo-mechanical effects of spent nuclear fuel on the rock in Croatia/Slovenia can be produced, which proves the suitability of the rock mass for this purpose.

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Section: Discussionmentioning

confidence: 99%

Section: Selected Conceptmentioning

confidence: 99%

Thermo-Hydro-Mechanical Effects on Host Rock for a Generic Spent Nuclear Fuel Repository

Veinović¹,

Uroić²,

Domitrović³

et al. 2020

MGPB

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“…The factor of safety of certain locations in the rock can be estimated using the Mohr-Coulomb failure criterion with the availability of major and minor principal stress at that location (Kwon et al, 2013). Figure 3 shows the technique to calculate safety factor using this failure criterion.…”

Section: Safety Factor Calculation From Mohr-coulomb Failure Criteriomentioning

confidence: 99%

Three-Dimensional Analysis of Gate-Entry Stability in Multiple Seams Longwall Coal Mine Under Weak Rock Conditions

Mao¹,

Sasaoka²,

Shimada³

et al. 2020

ESR

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A study of multiple seams longwall mining is proposed to investigate its applicability in Indonesia coal mine. The study area of this research is PT Gerbang Daya Mandiri (GDM) coal mine located in East Kalimantan Island. The study of seam interaction is crucial for developing multiple seams longwall mining especially when it comes to weak rock conditions which are usually found in most of the coal reserves in Indonesia. This paper will use numerical simulation to investigate the effect of the first mined-out seam on the development of the second coal seam gate-entry by considering a couple of key parameters including depth of the coal seam and interburden length. The simulation model consists of two main indicators for instability which include failure zone, the contour of safety factor. The results show that the effect of seam interaction on gate-entry has different intensity based on the thickness of the interburden and coal seam depth. This work also provided appropriate support configuration for maintaining the stability of gate-entry.

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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 Analysis of the Thermal and Mechanical Behavior of Engineered Barriers in a High-Level Radioactive Waste Repository

Cited by 22 publications

References 8 publications

Thermo-Hydro-Mechanical Effects on Host Rock for a Generic Spent Nuclear Fuel Repository

Thermo-Hydro-Mechanical Effects on Host Rock for a Generic Spent Nuclear Fuel Repository

Three-Dimensional Analysis of Gate-Entry Stability in Multiple Seams Longwall Coal Mine Under Weak Rock Conditions

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

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