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POSIVA Report 1996-20

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Name:

Loviisan Hästholmenin soveltuvuus käytetyn polttoaineen loppusijoitukseen. Esiselvitys

Language:

Finnish

Page count:

82

ISBN:

951-652-019-7; 1239-3096

Summary:

Working report: SUITABILITY OF HÄSTHOLMEN LOVIISA FOR FINAL DISPOSAL OF SPENT FUEL
- PRELIMINARY STUDY




Based on the amendment of the Nuclear Energy Act the spent nuclear fuel of Imatran Voima
Oy (IVO) will also be disposed of in Finland instead of returning it to Russia. After Teollisuuden
Voima Oy (TVO) and IVO had founded a joint company Posiva Oy the work IVO started in 1995
was brought together with the ongoing research programme for final disposal of spent fuel and
extended to a feasibility study. This study was regarded important since the Hästholmen island is,
as the host to a nuclear power plant, in a similar position with Olkiluoto island.
The feasibility study was launched in the beginning of 1996. The geological evaluation was
mainly based on the previous investigations at the island. For this study the complementary geo-
logical mapping has been carried out at the Hästholmen and on the surrounding area with a radius of 20 km. The dominating rock type, Rapakivigranite, does not differ from the respective rock types at the other investigation sites. The structure of the bedrock is rather simple and the fracture zones important to groundwater flow easier to predict. The information from hydrogeochemistry indicates an increasing salinity towards the depth.
The possibilities to locate the vault at approximately 500 m depth in the bedrock of the island
has been studied. It is possible to delineate a large enough bedrock volume under the island for
this purpose. The site for the encapsulation station above ground can be found in the vicinity of
the power plant units. The relevant questions regarding the possible site characterization are in-
volved with the presence and frequency of the horizontal fracture zones, the chemistry of the
groundwater and the nature of the groundwater flow. To investigate these would call for deep
drillings down to a depth of one kilometer.
The advantageous situation of Loviisa town and good traffic connections make it possible that
the spent fuel from Olkiluoto to Loviisa can be transported either by road, or by combined road
and rail transport. In addition, the transportation by sea combined with road transport is also
feasible. The town provides good services. During the construction period and the operational
stage the materials and services needed can be purchased within the Loviisa area. The resources of the town allow services for a population significantly denser than today. For the housing of the personnel there are good opportunities. The economical benefits from the facility to the town are incurred partly by the direct property and income taxes and partly by growing economical activity.
The tax income calculated by the property tax percentage applied to nuclear waste facilities today would result over 11 million FIM in a year as a maximum. More than 200 jobs would be available during the construction stage and approximately 120 jobs during the operational period.
For the construction license a decision by the Finnish Government will be needed. The
Government can come to a positive decision only when the local authority stands for the proposal. Before the application for the decision in principle will be submitted the environmental impact assessment of the final disposal has to be carried out.
SUITABILITY OF HÄSTHOLMEN LOVIISA FOR FINAL DISPOSAL OF SPENT FUEL
- PRELIMINARY STUDY




Based on the amendment of the Nuclear Energy Act the spent nuclear fuel of Imatran Voima
Oy (IVO) will also be disposed of in Finland instead of returning it to Russia. After Teollisuuden
Voima Oy (TVO) and IVO had founded a joint company Posiva Oy the work IVO started in 1995
was brought together with the ongoing research programme for final disposal of spent fuel and
extended to a feasibility study. This study was regarded important since the Hästholmen island is,
as the host to a nuclear power plant, in a similar position with Olkiluoto island.
The feasibility study was launched in the beginning of 1996. The geological evaluation was
mainly based on the previous investigations at the island. For this study the complementary geo-
logical mapping has been carried out at the Hästholmen and on the surrounding area with a radius of 20 km. The dominating rock type, Rapakivigranite, does not differ from the respective rock types at the other investigation sites. The structure of the bedrock is rather simple and the fracture zones important to groundwater flow easier to predict. The information from hydrogeochemistry indicates an increasing salinity towards the depth.
The possibilities to locate the vault at approximately 500 m depth in the bedrock of the island
has been studied. It is possible to delineate a large enough bedrock volume under the island for
this purpose. The site for the encapsulation station above ground can be found in the vicinity of
the power plant units. The relevant questions regarding the possible site characterization are in-
volved with the presence and frequency of the horizontal fracture zones, the chemistry of the
groundwater and the nature of the groundwater flow. To investigate these would call for deep
drillings down to a depth of one kilometer.
The advantageous situation of Loviisa town and good traffic connections make it possible that
the spent fuel from Olkiluoto to Loviisa can be transported either by road, or by combined road
and rail transport. In addition, the transportation by sea combined with road transport is also
feasible. The town provides good services. During the construction period and the operational
stage the materials and services needed can be purchased within the Loviisa area. The resources of the town allow services for a population significantly denser than today. For the housing of the personnel there are good opportunities. The economical benefits from the facility to the town are incurred partly by the direct property and income taxes and partly by growing economical activity.
The tax income calculated by the property tax percentage applied to nuclear waste facilities today would result over 11 million FIM in a year as a maximum. More than 200 jobs would be available during the construction stage and approximately 120 jobs during the operational period.
For the construction license a decision by the Finnish Government will be needed. The
Government can come to a positive decision only when the local authority stands for the proposal. Before the application for the decision in principle will be submitted the environmental impact assessment of the final disposal has to be carried out.

Keywords:

File(s):

Loviisan Hästholmenin soveltuvuus käytetyn polttoaineen loppusijoitukseen. Esiselvitys (pdf) (7.2 MB)


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