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POSIVA Report 1996-14

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Name:

Käytetyn polttoaineen loppusijoitus Suomen kallioperään, Tekniikkatutkimukset vuosina 1993-1996

Language:

Finnish

Page count:

86

ISBN:

951-652-013-8; 1239-3096

Summary:

Working report: FINAL DISPOSAL OF SPENT NUCLEAR FUEL IN THE FINNISH BEDROCK,
TECHNICAL RESEARCH AND DEVELOPMENT IN THE PERIOD 1993 - 1996



Planning activity relating to the disposal of spent fuel from the Teollisuuden Voima Oy (TVO)
and Imatran Voima Oy (IVO) nuclear power plants in Finland is targeted at selection of the site
for final disposal in the year 2000, with final disposal actually beginning in 2020. The spent fuel
management programme, which is run by Posiva Oy, is based on final disposal in the Finnish
bedrock.

The technical solutions for the encapsulation plant and final disposal facilities were presented in a
report published at the end of 1992 which summarized the safety and technology project.
Technical development work continued as the technology project (the TEKA-project), which was
scheduled for the period 1993 - 1996. From the beginning of 1995, IVO´s spent fuel was included
in the planning for final disposal. The TEKA-project included the development of technology for
transportation, encapsulation and final disposal, the evaluation of alternative disposal concepts and
safety aspects during the operation in addition to estimation of the costs. Long term behaviour of
the technical barriers and the near field was considered. This report describes the research and
development work carried out in the years 1993 - 1996, the current revised concept for final
disposal technology and the research and development programme for the period 1997 - 2000.

The basic concept for encapsulation is based on cold processing and use of a copper canister with
a cast insert and a copper mantle. The basic concept for the repository is based on a KBS-3-type
repository constructed in the bedrock at a depth of 300 - 700 metres. Encapsulated spent fuel will
be emplaced in vertical holes bored in the floors of horizontal deposition tunnels. In the holes,
canisters will be isolated from the bedrock by tightly compacted bentonite clay. As soon as the
last canisters have been emplaced the encapsulation plant will be dismantled and the tunnels and
shafts sealed.
FINAL DISPOSAL OF SPENT NUCLEAR FUEL IN THE FINNISH BEDROCK,
TECHNICAL RESEARCH AND DEVELOPMENT IN THE PERIOD 1993 - 1996



Planning activity relating to the disposal of spent fuel from the Teollisuuden Voima Oy (TVO)
and Imatran Voima Oy (IVO) nuclear power plants in Finland is targeted at selection of the site
for final disposal in the year 2000, with final disposal actually beginning in 2020. The spent fuel
management programme, which is run by Posiva Oy, is based on final disposal in the Finnish
bedrock.

The technical solutions for the encapsulation plant and final disposal facilities were presented in a
report published at the end of 1992 which summarized the safety and technology project.
Technical development work continued as the technology project (the TEKA-project), which was
scheduled for the period 1993 - 1996. From the beginning of 1995, IVO´s spent fuel was included
in the planning for final disposal. The TEKA-project included the development of technology for
transportation, encapsulation and final disposal, the evaluation of alternative disposal concepts and
safety aspects during the operation in addition to estimation of the costs. Long term behaviour of
the technical barriers and the near field was considered. This report describes the research and
development work carried out in the years 1993 - 1996, the current revised concept for final
disposal technology and the research and development programme for the period 1997 - 2000.

The basic concept for encapsulation is based on cold processing and use of a copper canister with
a cast insert and a copper mantle. The basic concept for the repository is based on a KBS-3-type
repository constructed in the bedrock at a depth of 300 - 700 metres. Encapsulated spent fuel will
be emplaced in vertical holes bored in the floors of horizontal deposition tunnels. In the holes,
canisters will be isolated from the bedrock by tightly compacted bentonite clay. As soon as the
last canisters have been emplaced the encapsulation plant will be dismantled and the tunnels and
shafts sealed.

Keywords:

File(s):

Käytetyn polttoaineen loppusijoitus Suomen kallioperään, Tekniikkatutkimukset vuosina 1993-1996 (pdf) (5.4 MB)


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