Buffering against intrusion of groundwater of undesirable composition

Petteri Pitkänen, Ari Luukkonen, Sami Partamies

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Favourable hydrogeochemical conditions in a geological repository for spent nuclear fuel might be unbalanced by intrusion of undesirable water compositions. Such conditions have been triggered by hydrogeological transients caused by glacial cycles in Fennoscandian Shield. Deglaciation and marine stages are such changes, which could have introduced either dilute, low pH and oxic melt water or marine source water for SO4 reduction producing dissolved sulphide, and have unbalanced favourable hydrogeochemical conditions in the geological past. It appears that groundwater system has a sufficient buffering capacity against these natural perturbations, and is able to stabilize chemical conditions. Current understanding of hydrogeochemical system does not support notable dilution and indicates strong buffering capacity against O2 infiltration or low pH water. However, the information cannot unambiguously prove that oxygen has not reached deep bedrock and one major uncertainty is associated with existence and rate of marine sulphate reduction. Therefore focussed fracture mineral studies and field investigations with modelling exercises are desirable to verify the stability of favourable hydrogeochemical conditions.
Original languageEnglish
Title of host publicationOrganisation for Economic Co-Operation and Development
Subtitle of host publicationNuclear Energy Agency
Pages173-184
Volume75
Publication statusPublished - 2009
MoE publication typeA4 Article in a conference publication
EventWorkshop on stability and buffering capacity of the geosphere for long-term isolation of radioactive waste: Application to crystalline rock - Manchester, United Kingdom
Duration: 13 Nov 200715 Nov 2007

Conference

ConferenceWorkshop on stability and buffering capacity of the geosphere for long-term isolation of radioactive waste
CountryUnited Kingdom
CityManchester
Period13/11/0715/11/07

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buffering
groundwater
deglaciation
meltwater
repository
water
shield
bedrock
dilution
infiltration
sulfide
perturbation
sulfate
oxygen
mineral
modeling

Cite this

Pitkänen, P., Luukkonen, A., & Partamies, S. (2009). Buffering against intrusion of groundwater of undesirable composition. In Organisation for Economic Co-Operation and Development: Nuclear Energy Agency (Vol. 75, pp. 173-184)
Pitkänen, Petteri ; Luukkonen, Ari ; Partamies, Sami. / Buffering against intrusion of groundwater of undesirable composition. Organisation for Economic Co-Operation and Development: Nuclear Energy Agency. Vol. 75 2009. pp. 173-184
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Pitkänen, P, Luukkonen, A & Partamies, S 2009, Buffering against intrusion of groundwater of undesirable composition. in Organisation for Economic Co-Operation and Development: Nuclear Energy Agency. vol. 75, pp. 173-184, Workshop on stability and buffering capacity of the geosphere for long-term isolation of radioactive waste, Manchester, United Kingdom, 13/11/07.

Buffering against intrusion of groundwater of undesirable composition. / Pitkänen, Petteri; Luukkonen, Ari; Partamies, Sami.

Organisation for Economic Co-Operation and Development: Nuclear Energy Agency. Vol. 75 2009. p. 173-184.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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T1 - Buffering against intrusion of groundwater of undesirable composition

AU - Pitkänen, Petteri

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N2 - Favourable hydrogeochemical conditions in a geological repository for spent nuclear fuel might be unbalanced by intrusion of undesirable water compositions. Such conditions have been triggered by hydrogeological transients caused by glacial cycles in Fennoscandian Shield. Deglaciation and marine stages are such changes, which could have introduced either dilute, low pH and oxic melt water or marine source water for SO4 reduction producing dissolved sulphide, and have unbalanced favourable hydrogeochemical conditions in the geological past. It appears that groundwater system has a sufficient buffering capacity against these natural perturbations, and is able to stabilize chemical conditions. Current understanding of hydrogeochemical system does not support notable dilution and indicates strong buffering capacity against O2 infiltration or low pH water. However, the information cannot unambiguously prove that oxygen has not reached deep bedrock and one major uncertainty is associated with existence and rate of marine sulphate reduction. Therefore focussed fracture mineral studies and field investigations with modelling exercises are desirable to verify the stability of favourable hydrogeochemical conditions.

AB - Favourable hydrogeochemical conditions in a geological repository for spent nuclear fuel might be unbalanced by intrusion of undesirable water compositions. Such conditions have been triggered by hydrogeological transients caused by glacial cycles in Fennoscandian Shield. Deglaciation and marine stages are such changes, which could have introduced either dilute, low pH and oxic melt water or marine source water for SO4 reduction producing dissolved sulphide, and have unbalanced favourable hydrogeochemical conditions in the geological past. It appears that groundwater system has a sufficient buffering capacity against these natural perturbations, and is able to stabilize chemical conditions. Current understanding of hydrogeochemical system does not support notable dilution and indicates strong buffering capacity against O2 infiltration or low pH water. However, the information cannot unambiguously prove that oxygen has not reached deep bedrock and one major uncertainty is associated with existence and rate of marine sulphate reduction. Therefore focussed fracture mineral studies and field investigations with modelling exercises are desirable to verify the stability of favourable hydrogeochemical conditions.

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VL - 75

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BT - Organisation for Economic Co-Operation and Development

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Pitkänen P, Luukkonen A, Partamies S. Buffering against intrusion of groundwater of undesirable composition. In Organisation for Economic Co-Operation and Development: Nuclear Energy Agency. Vol. 75. 2009. p. 173-184