Numerical investigation of high level nuclear waste disposal in deep anisotropic geologic repositories

Handle URI:
http://hdl.handle.net/10754/594185
Title:
Numerical investigation of high level nuclear waste disposal in deep anisotropic geologic repositories
Authors:
Salama, Amgad ( 0000-0002-4463-1010 ) ; El Amin, Mohamed F.; Sun, Shuyu ( 0000-0002-3078-864X )
Abstract:
One of the techniques that have been proposed to dispose high level nuclear waste (HLW) has been to bury them in deep geologic formations, which offer relatively enough space to accommodate the large volume of HLW accumulated over the years since the dawn of nuclear era. Albeit the relatively large number of research works that have been conducted to investigate temperature distribution surrounding waste canisters, they all abide to consider the host formations as homogeneous and isotropic. While this could be the case in some subsurface settings, in most cases, this is not true. In other words, subsurface formations are, in most cases, inherently anisotropic and heterogeneous. In this research, we show that even a slight difference in anisotropy of thermal conductivity of host rock with direction could have interesting effects on temperature fields. We investigate the effect of anisotropy angle (the angle the principal direction of anisotropy is making with the coordinate system) on the temperature field as well as on the maximum temperature attained in different barrier systems. This includes 0°, 30°, 45°, 60°, and 90°in addition to the isotropic case as a reference. We also consider the effect of anisotropy ratio (the ratio between the principal direction anisotropies) on the temperature fields and maximum temperature history. This includes ratios ranging between 1.5 and 4. Interesting patterns of temperature fields and profiles are obtained. It is found that the temperature contours are aligned more towards the principal direction of anisotropy. Furthermore the peak temperature in the buffer zone is found to be larger the smaller the anisotropy angle and vice versa. © 2015 Elsevier Ltd. All rights reserved.
KAUST Department:
Computational Transport Phenomena Lab; Physical Sciences and Engineering (PSE) Division
Citation:
Salama A, El Amin MF, Sun S (2015) Numerical investigation of high level nuclear waste disposal in deep anisotropic geologic repositories. Progress in Nuclear Energy 85: 747–755. Available: http://dx.doi.org/10.1016/j.pnucene.2015.09.004.
Publisher:
Elsevier BV
Journal:
Progress in Nuclear Energy
Issue Date:
Nov-2015
DOI:
10.1016/j.pnucene.2015.09.004
Type:
Article
ISSN:
0149-1970
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Computational Transport Phenomena Lab

Full metadata record

DC FieldValue Language
dc.contributor.authorSalama, Amgaden
dc.contributor.authorEl Amin, Mohamed F.en
dc.contributor.authorSun, Shuyuen
dc.date.accessioned2016-01-19T13:23:23Zen
dc.date.available2016-01-19T13:23:23Zen
dc.date.issued2015-11en
dc.identifier.citationSalama A, El Amin MF, Sun S (2015) Numerical investigation of high level nuclear waste disposal in deep anisotropic geologic repositories. Progress in Nuclear Energy 85: 747–755. Available: http://dx.doi.org/10.1016/j.pnucene.2015.09.004.en
dc.identifier.issn0149-1970en
dc.identifier.doi10.1016/j.pnucene.2015.09.004en
dc.identifier.urihttp://hdl.handle.net/10754/594185en
dc.description.abstractOne of the techniques that have been proposed to dispose high level nuclear waste (HLW) has been to bury them in deep geologic formations, which offer relatively enough space to accommodate the large volume of HLW accumulated over the years since the dawn of nuclear era. Albeit the relatively large number of research works that have been conducted to investigate temperature distribution surrounding waste canisters, they all abide to consider the host formations as homogeneous and isotropic. While this could be the case in some subsurface settings, in most cases, this is not true. In other words, subsurface formations are, in most cases, inherently anisotropic and heterogeneous. In this research, we show that even a slight difference in anisotropy of thermal conductivity of host rock with direction could have interesting effects on temperature fields. We investigate the effect of anisotropy angle (the angle the principal direction of anisotropy is making with the coordinate system) on the temperature field as well as on the maximum temperature attained in different barrier systems. This includes 0°, 30°, 45°, 60°, and 90°in addition to the isotropic case as a reference. We also consider the effect of anisotropy ratio (the ratio between the principal direction anisotropies) on the temperature fields and maximum temperature history. This includes ratios ranging between 1.5 and 4. Interesting patterns of temperature fields and profiles are obtained. It is found that the temperature contours are aligned more towards the principal direction of anisotropy. Furthermore the peak temperature in the buffer zone is found to be larger the smaller the anisotropy angle and vice versa. © 2015 Elsevier Ltd. All rights reserved.en
dc.publisherElsevier BVen
dc.subjectAnisotropic subsurface formationsen
dc.subjectControl volume approachen
dc.subjectHigh level nuclear waste disposalen
dc.titleNumerical investigation of high level nuclear waste disposal in deep anisotropic geologic repositoriesen
dc.typeArticleen
dc.contributor.departmentComputational Transport Phenomena Laben
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalProgress in Nuclear Energyen
dc.contributor.institutionMathematics Department, Faculty of Science, Aswan University, Aswan, Egypten
kaust.authorSalama, Amgaden
kaust.authorEl-Amin, Mohameden
kaust.authorSun, Shuyuen
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