Geology of Olkiluoto

Ismo Aaltonen (Editor), Jon Engström (Editor), Kai Front (Editor), Seppo Gehör (Editor), Paula Kosunen (Editor), Aulis Kärki (Editor), Markku Paananen (Editor), Seppo Paulamäki (Editor), Jussi A. Mattila

Research output: Book/ReportReport

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". In 2016, the Finnish Government granted a licence to Posiva for the construction of a final disposal facility for spent nuclear fuel.

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
PublisherPosiva
Number of pages398
ISBN (Print)978-951-652-244-2
Publication statusPublished - 2016
MoE publication typeD4 Published development or research report or study

Publication series

SeriesPosiva-raportti - Posiva Report
Volume2016-16
ISSN1239-3096

Fingerprint

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

Keywords

  • lithology
  • deformation
  • hydrothermal alteration
  • geological model
  • 3D modelling
  • spent nuclear fuel disposal
  • nuclear waste management
  • Olkiluoto
  • Eurajoki
  • Finland

Cite this

Aaltonen, I. (Ed.), Engström, J. (Ed.), Front, K. (Ed.), Gehör, S. (Ed.), Kosunen, P. (Ed.), Kärki, A. (Ed.), ... Mattila, J. A. (2016). Geology of Olkiluoto. Posiva . Posiva-raportti - Posiva Report, Vol.. 2016-16
Aaltonen, Ismo (Editor) ; Engström, Jon (Editor) ; Front, Kai (Editor) ; Gehör, Seppo (Editor) ; Kosunen, Paula (Editor) ; Kärki, Aulis (Editor) ; Paananen, Markku (Editor) ; Paulamäki, Seppo (Editor) ; Mattila, Jussi A. / Geology of Olkiluoto. Posiva , 2016. 398 p. (Posiva-raportti - Posiva Report, Vol. 2016-16).
@book{d364dbb1d7c444b28b6577bfb7a18556,
title = "Geology of Olkiluoto",
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{"}. In 2016, the Finnish Government granted a licence to Posiva for the construction of a final disposal facility for spent nuclear fuel.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.",
keywords = "lithology, deformation, hydrothermal alteration, geological model, 3D modelling, spent nuclear fuel disposal, nuclear waste management, Olkiluoto, Eurajoki, Finland",
author = "Mattila, {Jussi A.}",
editor = "Ismo Aaltonen and Jon Engstr{\"o}m and Kai Front and Seppo Geh{\"o}r and Paula Kosunen and Aulis K{\"a}rki and Markku Paananen and Seppo Paulam{\"a}ki",
note = "Project code: 108996",
year = "2016",
language = "English",
isbn = "978-951-652-244-2",
series = "Posiva-raportti - Posiva Report",
publisher = "Posiva",
address = "Finland",

}

Aaltonen, I (ed.), Engström, J (ed.), Front, K (ed.), Gehör, S (ed.), Kosunen, P (ed.), Kärki, A (ed.), Paananen, M (ed.), Paulamäki, S (ed.) & Mattila, JA 2016, Geology of Olkiluoto. Posiva-raportti - Posiva Report, vol. 2016-16, Posiva .

Geology of Olkiluoto. / Aaltonen, Ismo (Editor); Engström, Jon (Editor); Front, Kai (Editor); Gehör, Seppo (Editor); Kosunen, Paula (Editor); Kärki, Aulis (Editor); Paananen, Markku (Editor); Paulamäki, Seppo (Editor); Mattila, Jussi A.

Posiva , 2016. 398 p. (Posiva-raportti - Posiva Report, Vol. 2016-16).

Research output: Book/ReportReport

TY - BOOK

T1 - Geology of Olkiluoto

AU - Mattila, Jussi A.

A2 - Aaltonen, Ismo

A2 - Engström, Jon

A2 - Front, Kai

A2 - Gehör, Seppo

A2 - Kosunen, Paula

A2 - Kärki, Aulis

A2 - Paananen, Markku

A2 - Paulamäki, Seppo

N1 - Project code: 108996

PY - 2016

Y1 - 2016

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". In 2016, the Finnish Government granted a licence to Posiva for the construction of a final disposal facility for spent nuclear fuel.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". In 2016, the Finnish Government granted a licence to Posiva for the construction of a final disposal facility for spent nuclear fuel.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.

KW - lithology

KW - deformation

KW - hydrothermal alteration

KW - geological model

KW - 3D modelling

KW - spent nuclear fuel disposal

KW - nuclear waste management

KW - Olkiluoto

KW - Eurajoki

KW - Finland

M3 - Report

SN - 978-951-652-244-2

T3 - Posiva-raportti - Posiva Report

BT - Geology of Olkiluoto

PB - Posiva

ER -

Aaltonen I, (ed.), Engström J, (ed.), Front K, (ed.), Gehör S, (ed.), Kosunen P, (ed.), Kärki A, (ed.) et al. Geology of Olkiluoto. Posiva , 2016. 398 p. (Posiva-raportti - Posiva Report, Vol. 2016-16).