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POSIVA Report 1998-5

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Name:

Sorption of Iodine on Rocks from Posiva Investigation Sites

Writer:

Seija Kulmala; Martti Hakanen; Antero Lindberg

Language:

English

Page count:

44

ISBN:

951-652-043-X; 1239-3096

Summary:

Working report: POSIVA-raportti POSIVA 98-05, 43 sivua
ISBN 951-652-043-X


SORPTION OF IODINE ON ROCKS FROM POSIVA INVESTIGATION SITES


ABSTRACT

Posiva Oy intends to dispose of the spent nuclear fuel produced in Finnish nuclear
power plants in a repository deep in the Finnish bedrock. For the purpose, Posiva Oy
has selected four areas in Finland for detailed investigation. These areas are Kivetty in
Äänekoski, Romuvaara in Kuhmo, Olkiluoto in Eurajoki and Hästholmen in Loviisa.

In the Finnish safety analysis (TILA-96), a Kd value of 2×10-4 m3/kg is used for iodine in
far-field conditions. The Kd value is based on experiments performed in Sweden and at
the Department of Radiochemistry, University of Helsinki. The purpose of this study
was to verify the values in new experiments.

The sorption of iodine was studied in batch experiments and retardation in column
experiments. The batch experiments with non-saline Allard water gave Rd values of
0.11-1.7 ml/g for Olkiluoto rocks, 0.13-0.55 ml/g for Romuvaara rocks, 0.23-2.3 ml/g
for Kivetty rocks and 0.13-0.71 ml/g for Hästholmen rock. With saline OLSO water, the
Rd values were £ 0.03 ml/g for both Olkiluoto and Hästholmen rock. The Rd values for
non-saline water are almost the same as in earlier studies, but the Rd values for saline
water are about one decade lower than the values for rapakivi granite and brackish water
measured earlier.

The column studies on iodine with relatively high flow rates showed no significant
difference between the retardation of iodine and the retardation of tritiated water.


Keywords: iodine, sorption, retardation, batch experiments, retardation


POSIVA-raportti POSIVA 98-05, 43 sivua
ISBN 951-652-043-X


SORPTION OF IODINE ON ROCKS FROM POSIVA INVESTIGATION SITES


ABSTRACT

Posiva Oy intends to dispose of the spent nuclear fuel produced in Finnish nuclear
power plants in a repository deep in the Finnish bedrock. For the purpose, Posiva Oy
has selected four areas in Finland for detailed investigation. These areas are Kivetty in
Äänekoski, Romuvaara in Kuhmo, Olkiluoto in Eurajoki and Hästholmen in Loviisa.

In the Finnish safety analysis (TILA-96), a Kd value of 2×10-4 m3/kg is used for iodine in
far-field conditions. The Kd value is based on experiments performed in Sweden and at
the Department of Radiochemistry, University of Helsinki. The purpose of this study
was to verify the values in new experiments.

The sorption of iodine was studied in batch experiments and retardation in column
experiments. The batch experiments with non-saline Allard water gave Rd values of
0.11-1.7 ml/g for Olkiluoto rocks, 0.13-0.55 ml/g for Romuvaara rocks, 0.23-2.3 ml/g
for Kivetty rocks and 0.13-0.71 ml/g for Hästholmen rock. With saline OLSO water, the
Rd values were £ 0.03 ml/g for both Olkiluoto and Hästholmen rock. The Rd values for
non-saline water are almost the same as in earlier studies, but the Rd values for saline
water are about one decade lower than the values for rapakivi granite and brackish water
measured earlier.

The column studies on iodine with relatively high flow rates showed no significant
difference between the retardation of iodine and the retardation of tritiated water.


Keywords: iodine, sorption, retardation, batch experiments, retardation


Keywords:

iodine; sorption; retardation; batch experiments; retardation

File(s):

Sorption of Iodine on Rocks from Posiva Investigation Sites (pdf) (565.4 KB)


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