Geology of Olkiluoto: the disposal site for spent nuclear fuel in Finland

Ismo S. Aaltonen, Jon O. Engström, Kai A. Front, Seppo A. Gehör, Aulis J. Kärki, Paula J. Kosunen, Jussi A. Mattila, Markku Paananen, Seppo Paulamäki

Research output: Contribution to conferenceConference AbstractScientific

Abstract

Olkiluoto Island, which is located in SW Finland, has been selected as the deep geological repository for the high-level nuclear waste generated by the nuclear power plants operated by the Finnish power companies TVO and Fortum, and the repository is expected to become operational in the early 2020s. Posiva is an expert organisation responsible for the management and implementation of the nuclear waste repository at Olkiluoto and is owned by TVO and Fortum. Posiva submitted a construction licence application to the Finnish government in December 2012 and an integrated description of the Olkiluoto site, including its geology, was a part of the background material. After their review, in early 2015, the Radiation and Nuclear Safety Authority in Finland (STUK) gave a positive statement to the Ministry of Employment and the Economy: "the final disposal facility designed by Posiva can be built to be safe".Posiva has continued updating the multidisciplinary site description, which is aiming at the last licencing stage of the repository - the application of the operating licence. Understanding the geology of Olkiluoto is a substantial part of the site description work. It is based on data from hundreds of outcrops, tens of kilometers of drill core, extensive tunnel mapping programme and a wide variety of geophysical investigations. The Palaeoproterozoic bedrock in Olkiluoto consists of variably migmatised supracrustal high-grade metamorphic rocks: migmatized meta-pelites, meta-arenites and intermediate, pyroclastic metavolcanites. They are intruded by Paleoproterozoic felsic, granitic–tonalitic plutonic rocks and granitic pegmatoids, and diabase dikes. The rocks were metamorphosed simultaneously with the different phases of ductile deformation. Hydrothermal alteration at Olkiluoto can be subdivided into two different modes on the basis how the fluids have proceeded in the rock mass: fracture- or veinlet-controlled alteration and pervasive or disseminated alteration. The brittle deformation history of Olkiluoto can be reconstructed through paleostress inversion of fault-slip data from outcrops and drill cores and from K-Ar ages if fault gouge illites: seven distinct paleostress states can be identified, spanning in time from ca. 1.7 Ga to 1.0 Ga.
Original languageEnglish
Publication statusPublished - 2015
Event2015 GSA Annual Meeting in Baltimore, Maryland, USA - Maryland, United States
Duration: 1 Nov 20154 Nov 2015
https://gsa.confex.com/gsa/2015AM/webprogram/start.html (2015 GSA Annual Meeting in Baltimore, Maryland, USA)

Conference

Conference2015 GSA Annual Meeting in Baltimore, Maryland, USA
Abbreviated titleGSA 2015
CountryUnited States
CityMaryland
Period1/11/154/11/15
Internet address

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repository
geology
paleostress
radioactive waste
outcrop
fault gouge
brittle deformation
ductile deformation
felsic rock
fault slip
plutonic rock
nuclear power plant
diabase
hydrothermal alteration
rock
metamorphic rock
dike
bedrock
tunnel
fluid

Cite this

Aaltonen, I. S., Engström, J. O., Front, K. A., Gehör, S. A., Kärki, A. J., Kosunen, P. J., ... Paulamäki, S. (2015). Geology of Olkiluoto: the disposal site for spent nuclear fuel in Finland. Abstract from 2015 GSA Annual Meeting in Baltimore, Maryland, USA, Maryland, United States.
Aaltonen, Ismo S. ; Engström, Jon O. ; Front, Kai A. ; Gehör, Seppo A. ; Kärki, Aulis J. ; Kosunen, Paula J. ; Mattila, Jussi A. ; Paananen, Markku ; Paulamäki, Seppo. / Geology of Olkiluoto : the disposal site for spent nuclear fuel in Finland. Abstract from 2015 GSA Annual Meeting in Baltimore, Maryland, USA, Maryland, United States.
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}

Aaltonen, IS, Engström, JO, Front, KA, Gehör, SA, Kärki, AJ, Kosunen, PJ, Mattila, JA, Paananen, M & Paulamäki, S 2015, 'Geology of Olkiluoto: the disposal site for spent nuclear fuel in Finland' 2015 GSA Annual Meeting in Baltimore, Maryland, USA, Maryland, United States, 1/11/15 - 4/11/15, .

Geology of Olkiluoto : the disposal site for spent nuclear fuel in Finland. / Aaltonen, Ismo S.; Engström, Jon O.; Front, Kai A.; Gehör, Seppo A.; Kärki, Aulis J.; Kosunen, Paula J.; Mattila, Jussi A.; Paananen, Markku; Paulamäki, Seppo.

2015. Abstract from 2015 GSA Annual Meeting in Baltimore, Maryland, USA, Maryland, United States.

Research output: Contribution to conferenceConference AbstractScientific

TY - CONF

T1 - Geology of Olkiluoto

T2 - the disposal site for spent nuclear fuel in Finland

AU - Aaltonen, Ismo S.

AU - Engström, Jon O.

AU - Front, Kai A.

AU - Gehör, Seppo A.

AU - Kärki, Aulis J.

AU - Kosunen, Paula J.

AU - Mattila, Jussi A.

AU - Paananen, Markku

AU - Paulamäki, Seppo

PY - 2015

Y1 - 2015

N2 - Olkiluoto Island, which is located in SW Finland, has been selected as the deep geological repository for the high-level nuclear waste generated by the nuclear power plants operated by the Finnish power companies TVO and Fortum, and the repository is expected to become operational in the early 2020s. Posiva is an expert organisation responsible for the management and implementation of the nuclear waste repository at Olkiluoto and is owned by TVO and Fortum. Posiva submitted a construction licence application to the Finnish government in December 2012 and an integrated description of the Olkiluoto site, including its geology, was a part of the background material. After their review, in early 2015, the Radiation and Nuclear Safety Authority in Finland (STUK) gave a positive statement to the Ministry of Employment and the Economy: "the final disposal facility designed by Posiva can be built to be safe".Posiva has continued updating the multidisciplinary site description, which is aiming at the last licencing stage of the repository - the application of the operating licence. Understanding the geology of Olkiluoto is a substantial part of the site description work. It is based on data from hundreds of outcrops, tens of kilometers of drill core, extensive tunnel mapping programme and a wide variety of geophysical investigations. The Palaeoproterozoic bedrock in Olkiluoto consists of variably migmatised supracrustal high-grade metamorphic rocks: migmatized meta-pelites, meta-arenites and intermediate, pyroclastic metavolcanites. They are intruded by Paleoproterozoic felsic, granitic–tonalitic plutonic rocks and granitic pegmatoids, and diabase dikes. The rocks were metamorphosed simultaneously with the different phases of ductile deformation. Hydrothermal alteration at Olkiluoto can be subdivided into two different modes on the basis how the fluids have proceeded in the rock mass: fracture- or veinlet-controlled alteration and pervasive or disseminated alteration. The brittle deformation history of Olkiluoto can be reconstructed through paleostress inversion of fault-slip data from outcrops and drill cores and from K-Ar ages if fault gouge illites: seven distinct paleostress states can be identified, spanning in time from ca. 1.7 Ga to 1.0 Ga.

AB - Olkiluoto Island, which is located in SW Finland, has been selected as the deep geological repository for the high-level nuclear waste generated by the nuclear power plants operated by the Finnish power companies TVO and Fortum, and the repository is expected to become operational in the early 2020s. Posiva is an expert organisation responsible for the management and implementation of the nuclear waste repository at Olkiluoto and is owned by TVO and Fortum. Posiva submitted a construction licence application to the Finnish government in December 2012 and an integrated description of the Olkiluoto site, including its geology, was a part of the background material. After their review, in early 2015, the Radiation and Nuclear Safety Authority in Finland (STUK) gave a positive statement to the Ministry of Employment and the Economy: "the final disposal facility designed by Posiva can be built to be safe".Posiva has continued updating the multidisciplinary site description, which is aiming at the last licencing stage of the repository - the application of the operating licence. Understanding the geology of Olkiluoto is a substantial part of the site description work. It is based on data from hundreds of outcrops, tens of kilometers of drill core, extensive tunnel mapping programme and a wide variety of geophysical investigations. The Palaeoproterozoic bedrock in Olkiluoto consists of variably migmatised supracrustal high-grade metamorphic rocks: migmatized meta-pelites, meta-arenites and intermediate, pyroclastic metavolcanites. They are intruded by Paleoproterozoic felsic, granitic–tonalitic plutonic rocks and granitic pegmatoids, and diabase dikes. The rocks were metamorphosed simultaneously with the different phases of ductile deformation. Hydrothermal alteration at Olkiluoto can be subdivided into two different modes on the basis how the fluids have proceeded in the rock mass: fracture- or veinlet-controlled alteration and pervasive or disseminated alteration. The brittle deformation history of Olkiluoto can be reconstructed through paleostress inversion of fault-slip data from outcrops and drill cores and from K-Ar ages if fault gouge illites: seven distinct paleostress states can be identified, spanning in time from ca. 1.7 Ga to 1.0 Ga.

M3 - Conference Abstract

ER -

Aaltonen IS, Engström JO, Front KA, Gehör SA, Kärki AJ, Kosunen PJ et al. Geology of Olkiluoto: the disposal site for spent nuclear fuel in Finland. 2015. Abstract from 2015 GSA Annual Meeting in Baltimore, Maryland, USA, Maryland, United States.