TY - GEN
T1 - Consistency of the strontium transport parameters in Boom Clay obtained from different types of migration experiments
AU - Aertsens, Marc
AU - Maes, Norbert
AU - Van Gompel, Marc
N1 - Score = 3
PY - 2009/12
Y1 - 2009/12
N2 - Performance assessment calculations need accurate values for the transport parameters of radionuclides in Boom Clay. Consistency between the values of the transport parameters, determined from different types of diffusion experiments is studied for strontium. Therefore, a percolation test and two Through-Diffusion tests (on clay cores of different lengths) have been performed.
All experiments lead to a robust value for the apparent diffusion coefficient of strontium between 5E-12 m2/s and 10E-12 m2/s. A reliable value for the product R of the diffusion accessible porosity and the retardation factor R remains problematic. Fitting simultaneously the concentration decrease in the inlet as a function of time with the strontium profile of one of the Through-Diffusion experiments, leads to a value around 400. Estimating in another way R at the inlet/clay interface leads to a similar value. The values obtained from the percolation experiments are in line as well. However, fitting for both Through-Diffusion tests the outlet concentrations versus time leads to much lower values of R (0.15 and 0.5) Also, the strontium profile measured in the other Through-Diffusion test totally deviates from the predicted profile.
AB - Performance assessment calculations need accurate values for the transport parameters of radionuclides in Boom Clay. Consistency between the values of the transport parameters, determined from different types of diffusion experiments is studied for strontium. Therefore, a percolation test and two Through-Diffusion tests (on clay cores of different lengths) have been performed.
All experiments lead to a robust value for the apparent diffusion coefficient of strontium between 5E-12 m2/s and 10E-12 m2/s. A reliable value for the product R of the diffusion accessible porosity and the retardation factor R remains problematic. Fitting simultaneously the concentration decrease in the inlet as a function of time with the strontium profile of one of the Through-Diffusion experiments, leads to a value around 400. Estimating in another way R at the inlet/clay interface leads to a similar value. The values obtained from the percolation experiments are in line as well. However, fitting for both Through-Diffusion tests the outlet concentrations versus time leads to much lower values of R (0.15 and 0.5) Also, the strontium profile measured in the other Through-Diffusion test totally deviates from the predicted profile.
KW - Transport parameters
KW - strontium
KW - accessible porosity
KW - dispersion coefficient
KW - Boom Clay
KW - migration
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_103893
UR - http://knowledgecentre.sckcen.be/so2/bibref/6753
M3 - In-proceedings paper
SN - 978-1-60511-166-7
T3 - Materials Research Society proceedings
SP - 421
EP - 428
BT - Scientific Basis for Nuclear Waste Management XXXIII. Symposium Proceedings. Volume 1193
CY - Warrendale, PA, United States
T2 - 33rd International Symposium "Scientific Basis for Nuclear Waste Management". MRS
Y2 - 24 May 2009 through 29 May 2009
ER -