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Workreport 1998-19

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Name:

Borehole-TV Measurements at the Hästholmen Site, Finland 1 997 Volume 1, Report and Appendices for HH-KR1

Writer:

Allan Stråhle

Language:

English

Page count:

839

Summary:

Working report: ABSTRACT


The power companies in Finland using nuclear energy, Teollisuuden Voima Oy
and Imatran Voima Oy, are preparing for disposal of their spent nuclear fuel into
the bedrock of Finland. Posiva Oy is carrying out the programme for site
characterisation at four sites in Finland, Romuvaara in Kuhmo, Kivetty in
Äänekoski, Olkiluoto in Eurajoki and Hästholmen in Loviisa, are candidates for
the selection of the final site in year 2000.

Posiva (former TCO) has contracted since 1995 SKB to perform BIPS borehole
television logging to locate, orientate and characterise bedrock in several boreholes
at these sites. Geosigma AB and Malå GeoScience AB have carried out the logging.
Geosigma AB performed the processing and interpretation.

BIPS borehole-TV logging covering three boreholes (total of 2.800 m) at
Hästholmen, Study Site, was conducted with the BIP-1500 System. This report
covers the investigations of the Hästholmen boreholes (HH-KR1 1000 m, HH-
KR2 1000 m and HH-KR3 800 m).

The technique images 360 degrees of the borehole wall with a length resolution of
1 mm. Cross resolution is 1 pixel/degree. Length correction was performed using
data from drill cores.

The complete length of the boreholes were logged and mapped and the
discontinuities were characterised and oriented in reference to the borehole
direction. Borehole deviation measurements (Maxibor) were then used for the
automatic calculation of the true orientation.

360 degree high resolution colour image plots of the out rolled borehole wall were
produced in the length scale 1:10. Stereo diagrams showing the orientation of
open fractures, fractures with cavities and veins as well as tables of observed
features were also produced. All data were delivered on CD-ROM. A special
“Viewer” for viewing the images on a computer screen, was also delivered on
the data CD.

KEYWORDS: Site characterisation, spent nuclear fuel, disposal, borehole-TV,
BHTV,BIP-system, Hästholmen, Rapakivi granite, fracture orientation, fracture
aperture.



ABSTRACT


The power companies in Finland using nuclear energy, Teollisuuden Voima Oy
and Imatran Voima Oy, are preparing for disposal of their spent nuclear fuel into
the bedrock of Finland. Posiva Oy is carrying out the programme for site
characterisation at four sites in Finland, Romuvaara in Kuhmo, Kivetty in
Äänekoski, Olkiluoto in Eurajoki and Hästholmen in Loviisa, are candidates for
the selection of the final site in year 2000.

Posiva (former TCO) has contracted since 1995 SKB to perform BIPS borehole
television logging to locate, orientate and characterise bedrock in several boreholes
at these sites. Geosigma AB and Malå GeoScience AB have carried out the logging.
Geosigma AB performed the processing and interpretation.

BIPS borehole-TV logging covering three boreholes (total of 2.800 m) at
Hästholmen, Study Site, was conducted with the BIP-1500 System. This report
covers the investigations of the Hästholmen boreholes (HH-KR1 1000 m, HH-
KR2 1000 m and HH-KR3 800 m).

The technique images 360 degrees of the borehole wall with a length resolution of
1 mm. Cross resolution is 1 pixel/degree. Length correction was performed using
data from drill cores.

The complete length of the boreholes were logged and mapped and the
discontinuities were characterised and oriented in reference to the borehole
direction. Borehole deviation measurements (Maxibor) were then used for the
automatic calculation of the true orientation.

360 degree high resolution colour image plots of the out rolled borehole wall were
produced in the length scale 1:10. Stereo diagrams showing the orientation of
open fractures, fractures with cavities and veins as well as tables of observed
features were also produced. All data were delivered on CD-ROM. A special
“Viewer” for viewing the images on a computer screen, was also delivered on
the data CD.

KEYWORDS: Site characterisation, spent nuclear fuel, disposal, borehole-TV,
BHTV,BIP-system, Hästholmen, Rapakivi granite, fracture orientation, fracture
aperture.



Keywords:

Site characterisation; spent nuclear fuel; disposal; borehole-TV; BHTV; BIP-system; Hästholmen; Rapakivi granite; fracture orientation; fracture aperture

File(s):

Borehole-TV Measurements at the Hästholmen Site, Finland 1 997 Volume 1, Report and Appendices for HH-KR1 (pdf) (83.8 MB)


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