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POSIVA Report 1998-12

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Name:

Sorption of Plutonium on Rocks in Groundwaters from Posiva Investigation Sites

Writer:

Seija Kulmala; Martti Hakanen; Antero Lindberg

Language:

English

Page count:

55

ISBN:

951-652-050-2; 1239-3096

Summary:

Working report: Report POSIVA-98-12, Seija Kulmala, Martti Hakanen, Antero Lindberg
52 pages, English

SORPTION OF PLUTONIUM ON ROCKS IN GROUNDWATERS FROM POSIVA
INVESTIGATION SITES

ABSTRACT

Sorption of plutonium was studied as part of an investigation into the sorption and diffusion of nuclides
of spent nuclear fuel in Finnish bedrock. The sorption of Pu was studied for rocks and groundwaters
from three areas in Finland under consideration by Posiva Oy as locations for the repository of spent
nuclear fuel. These areas are Olkiluoto at Eurajoki, Romuvaara at Kuhmo and Kivetty at Äänekoski.

Sorption percentages and the mass distribution ratios, Rd values, were determined for crushed rock by
batch method. Polished rock thin sections were studied by autoradiographic method. The experiments
were performed under both oxic and anoxic (nitrogen atmosphere) conditions.

The Rd values under oxic conditions were ? 1.0 m3/kg, (0.05 - 0.4) m3/kg and (0.2 - 0.6) m3/kg for
Olkiluoto, Romuvaara and Kivetty rock samples, respectively. Under anoxic conditions the values were
(0.91 - 18) m3/kg for Olkiluoto, (0.38 - 9.1) m3/kg for Romuvaara and (1.0 - 5.9) m3/kg for Kivetty
samples. The oxidation/reduction equilibrium for the anoxic atmosphere was checked with some crushed
rock/groundwater samples spiked with Tc.


Key words: sorption, plutonium, bedrock, oxic and anoxic conditions, radioactive waste disposal,
autoradiography, batch method


Report POSIVA-98-12, Seija Kulmala, Martti Hakanen, Antero Lindberg
52 pages, English

SORPTION OF PLUTONIUM ON ROCKS IN GROUNDWATERS FROM POSIVA
INVESTIGATION SITES

ABSTRACT

Sorption of plutonium was studied as part of an investigation into the sorption and diffusion of nuclides
of spent nuclear fuel in Finnish bedrock. The sorption of Pu was studied for rocks and groundwaters
from three areas in Finland under consideration by Posiva Oy as locations for the repository of spent
nuclear fuel. These areas are Olkiluoto at Eurajoki, Romuvaara at Kuhmo and Kivetty at Äänekoski.

Sorption percentages and the mass distribution ratios, Rd values, were determined for crushed rock by
batch method. Polished rock thin sections were studied by autoradiographic method. The experiments
were performed under both oxic and anoxic (nitrogen atmosphere) conditions.

The Rd values under oxic conditions were ? 1.0 m3/kg, (0.05 - 0.4) m3/kg and (0.2 - 0.6) m3/kg for
Olkiluoto, Romuvaara and Kivetty rock samples, respectively. Under anoxic conditions the values were
(0.91 - 18) m3/kg for Olkiluoto, (0.38 - 9.1) m3/kg for Romuvaara and (1.0 - 5.9) m3/kg for Kivetty
samples. The oxidation/reduction equilibrium for the anoxic atmosphere was checked with some crushed
rock/groundwater samples spiked with Tc.


Key words: sorption, plutonium, bedrock, oxic and anoxic conditions, radioactive waste disposal,
autoradiography, batch method


Keywords:

sorption; plutonium; bedrock; oxic and anoxic conditions; radioactive waste disposal; autoradiography; batch method

File(s):

Sorption of Plutonium on Rocks in Groundwaters from Posiva Investigation Sites (pdf) (648.7 KB)


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