ACCOMMODATING GROUND-WATER VELOCITY UNCERTAINTIES IN THE ADVECTION-DISPERSION APPROACH TO GEOLOGIC NUCLEAR WASTE MIGRATION

This note shows how uncertainties in nearfield and farfield ground wat er velocities affect the inventory that migrates from a geologic nucle ar waste repository within the classical advection-dispersion approach and manifest themselves through both the finite variances and covaria nces in the activities of transported nuclides and in the apparent sca le dependence of the host rock's dispersivity. Included is a demonstra tion of these effects for an actinide chain released from used CANDUTM fuel buried in a hypothetical repository.