Comparative modeling of an in situ diffusion experiment in granite at the Grimsel Test Site
Result description
An in situ diffusion experiment was performed at the Grimsel Test Site (Switzerland). Several tracers (H-3 as HTO, Na-22(+), Cs-134(+), I-131(-) with stable I- as carrier) were continuously circulated through a packed-off borehole and the decrease in tracer concentrations in the liquid phase was monitored for a period of about 2 years. Subsequently, the borehole section was overcored and the tracer profiles in the rock analyzed (H-3, Na-22(+), Cs-134(+)) H-3 and Na-22(+) showed a similar decrease in activity in the circulation system (slightly larger drop for H-3). The drop in activity for Cs-134(+) was much more pronounced. Transport distances in the rock were about 20 cm for H-3, 10 cm for Na-22(+), and 1 cm for Cs-134(+). The dataset (except for I-131(-) because of complete decay at the end of the experiment) was analyzed with different diffusion-sorption models by different teams (IDAEA-CSIC, UJV-Rez, JAEA) using different codes, with the goal of obtaining effective diffusion coefficients (D-e) and porosity (phi) or rock capacity (alpha) values.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Comparative modeling of an in situ diffusion experiment in granite at the Grimsel Test Site
Original language description
An in situ diffusion experiment was performed at the Grimsel Test Site (Switzerland). Several tracers (H-3 as HTO, Na-22(+), Cs-134(+), I-131(-) with stable I- as carrier) were continuously circulated through a packed-off borehole and the decrease in tracer concentrations in the liquid phase was monitored for a period of about 2 years. Subsequently, the borehole section was overcored and the tracer profiles in the rock analyzed (H-3, Na-22(+), Cs-134(+)) H-3 and Na-22(+) showed a similar decrease in activity in the circulation system (slightly larger drop for H-3). The drop in activity for Cs-134(+) was much more pronounced. Transport distances in the rock were about 20 cm for H-3, 10 cm for Na-22(+), and 1 cm for Cs-134(+). The dataset (except for I-131(-) because of complete decay at the end of the experiment) was analyzed with different diffusion-sorption models by different teams (IDAEA-CSIC, UJV-Rez, JAEA) using different codes, with the goal of obtaining effective diffusion coefficients (D-e) and porosity (phi) or rock capacity (alpha) values.
Czech name
—
Czech description
—
Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DL - Nuclear waste, radioactive pollution and control
OECD FORD branch
—
Result continuities
Project
—
Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Contaminant Hydrology
ISSN
0169-7722
e-ISSN
—
Volume of the periodical
179
Issue of the periodical within the volume
August
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
13
Pages from-to
89-101
UT code for WoS article
—
EID of the result in the Scopus database
—
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
DL - Nuclear waste, radioactive pollution and control
Year of implementation
2015