IMPACT OF DIFFERENT FACTORS ON GAS MIGRATION IN THE DISPOSAL CELL OF CONCEPTUAL GEOLOGICAL REPOSITORY FOR HIGH LEVEL RADIOACTIVE WASTE

Abstract

The numerical modelling results of different factors impact on hydrogen gas migration in the disposal cell of conceptual geological repository for high level radioactive waste is presented in this paper. The assessment of various factors such as self healing of EDZ, different relative permeability function for geological medium, variation of diffusivity factor of dissolved hydrogen,  delay of gas generation, lower intrinsic permeability values for waste interface has been performed. Modelling results showed that decreasing of intrinsic permeability value in the EDZ has major impact on peak pressure. Decreasing of intrinsic permeability value in waste interface closes the preferential flow paths for gaseous hydrogen from disposal cell toward the access drift.

DOI: http://dx.doi.org/10.5755/j01.mech.18.6.3172