The paper describes deterministic simulation of radionuclide migration in the deep geological disposal system in clay and crystalline rock. The concept assumes different engineered barrier systems together with natural barrier. Carbon steel and cast iron in combination with copper shell were considered for the waste canister, whereas for buffer, bentonite and concrete materials were chosen. Based on scientific literature review, different combinations of the natural and engineered barriers were selected and modelled. Calculations were performed in simplified one-dimensional way for the timescale of up to one million years. The modelling consists of two interconnected parts: near-field and far-field. This approach allows on entire repository to be modelled as an integrated system. The migration of radionuclides is defined by the radioactive decay, ion exchange, dissolution and sorption parameters of different barriers. The mobile phase in the subsurface system is restricted to the aqueous phase. The transport processes taken into account are diffusion, advection and dispersion. Biosphere is not taken into account. The results are presented in the form of radionuclide release rates from the far-field as a function of time.

PRVAKOVA Slavka; 

2008-01-29

IYNC

JRC38180

https://publications.jrc.ec.europa.eu/repository/handle/JRC38180,