Databank

POSIVA Report 1996-19

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Name:

Käytetyn polttoaineen loppusijoitus Suomen kallioperään. Yksityiskohtaiset sijoituspaikkatutkimukset 1993-1996

Language:

Finnish

Page count:

222

ISBN:

951-652-018-9; 1239-3096

Summary:

Working report: FINAL DISPOSAL OF SPENT FUEL IN THE FINNISH BEDROCK,
DETAILED SITE INVESTIGATIONS 1993-1996



Posiva Oy, jointly owned company of Imatran Voima Oy (IVO) and Teollisuuden Voima Oy
(TVO), studies the Finnish bedrock for the final disposal of the spent nuclear fuel. The study is in
accordance with the decision in principle by Finnish government in 1983 and aims at site
selection. This report is the summary of the first stage of the detailed site investigations carried
out during the years 1993-1996. The three sites in question, Romuvaara in Kuhmo, Kivetty in
Äänekoski and Olkiluoto in Eurajoki were selected for the detailed characterization on the basis of
the preliminary site investigations at five areas. The interim reporting in 1996 is comprehensive
and comprises a series of reports covering different disciplines and sites.

The programme for 1993-1996 was divided into three sub-programs: 1) the baseline investigations
describing the present conditions in the bedrock, 2) the additional characterization for the
acquisition of complementary data, and 3) the investigations for testing the earlier results and
hypotheses to build confidence in existing understanding.

The baseline investigations have thoroughly characterized the groundwater chemistry of the sites,
as well as, summarized hydrological observations at the sites. Saline groundwaters were found at
Olkiluoto and preliminary results indicate that the salinity increases towards the depth. The state
of the rock stress measured in deep boreholes correlates with the general knowledge of rock stress
in Finnish bedrock. Based on the interpretation of additional characterization some
complementary features have been added, and some changes in earlier features have been made to
the structural models. The developments in the models do not, however, impede locating the vault
at the desired depth in the bedrock.

The results obtained confirm the former conclusions on the properties of the bedrock at each site,
and indicate that the safe disposal would be possible to achieve at every site. In the second stage,
1997-2000, the programme will concentrate to evaluate the sites by analysing and modelling the
information gathered. The further characterization is needed to increase hydrogeochemical
information and evaluate the transport of solutes.
FINAL DISPOSAL OF SPENT FUEL IN THE FINNISH BEDROCK,
DETAILED SITE INVESTIGATIONS 1993-1996



Posiva Oy, jointly owned company of Imatran Voima Oy (IVO) and Teollisuuden Voima Oy
(TVO), studies the Finnish bedrock for the final disposal of the spent nuclear fuel. The study is in
accordance with the decision in principle by Finnish government in 1983 and aims at site
selection. This report is the summary of the first stage of the detailed site investigations carried
out during the years 1993-1996. The three sites in question, Romuvaara in Kuhmo, Kivetty in
Äänekoski and Olkiluoto in Eurajoki were selected for the detailed characterization on the basis of
the preliminary site investigations at five areas. The interim reporting in 1996 is comprehensive
and comprises a series of reports covering different disciplines and sites.

The programme for 1993-1996 was divided into three sub-programs: 1) the baseline investigations
describing the present conditions in the bedrock, 2) the additional characterization for the
acquisition of complementary data, and 3) the investigations for testing the earlier results and
hypotheses to build confidence in existing understanding.

The baseline investigations have thoroughly characterized the groundwater chemistry of the sites,
as well as, summarized hydrological observations at the sites. Saline groundwaters were found at
Olkiluoto and preliminary results indicate that the salinity increases towards the depth. The state
of the rock stress measured in deep boreholes correlates with the general knowledge of rock stress
in Finnish bedrock. Based on the interpretation of additional characterization some
complementary features have been added, and some changes in earlier features have been made to
the structural models. The developments in the models do not, however, impede locating the vault
at the desired depth in the bedrock.

The results obtained confirm the former conclusions on the properties of the bedrock at each site,
and indicate that the safe disposal would be possible to achieve at every site. In the second stage,
1997-2000, the programme will concentrate to evaluate the sites by analysing and modelling the
information gathered. The further characterization is needed to increase hydrogeochemical
information and evaluate the transport of solutes.

Keywords:

File(s):

Käytetyn polttoaineen loppusijoitus Suomen kallioperään. Yksityiskohtaiset sijoituspaikkatutkimukset 1993-1996 (pdf) (25.2 MB)


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