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The aim of the study was to develop backfilling concepts with capabilities to attenuate near field effects of mined repositories in argillaceous host rocks by examining the characteristics and the performances of a clay host rock and potentialy favourable engineered barriers and assessnig system components which contribute their durability.
The main results are:
the HLW canister, used as refernce cannot be considered as a preventative barrier due to its collapse at an outside pressure of 2.5 MPa and to the sensitivity od austenitic steel at the stress corrosion cracking;
sulphate resistant concrete can be used as backfill material or as lining if it is sufficiently matured before being solicited by the thermal loading generated by the HLW packages;
excavated Boom clay can be used as buffer material but future research is necessary to determine the appropriate processing to be used and the eventual adjuvent(s) to be considered;
a program called TEMPRES is now available to compute the temperature, pore water pressure and stresses around heating sources in clay host rock, the validation is not yet complete but results look promising;
a program calle SOURCE was developed to approximate pore water pressure response at digging and drilling works performed in a isotropic medium where the pore fluid flow can be related to the pore water pressure by Darcy's Law.
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