NUMERICAL MODELING OF NUCLIDE TRANSPORT IN STRUCTURES AND THE NEAR FIELD OF A NEAR-SURFACE RADIOACTIVE WASTE DISPOSAL FACILITY

The paper considers a numerical model of radionuclide transport in the structural elements of a near-surface radioactive waste disposal facility (NSDF). It presents a calculation of a nuclide flow from the NSDF into the underlying rocks and groundwater considering three characteristic groups of radionuclides: long-lived weakly absorbable, long-lived absorbable and relatively short-lived (with a half-life of up to 31 years). The study demonstrates how the sorption properties of the engineered barriers, their geometric characteristics, as well as the features of radioactive waste package layout may influence radionuclide releases from the waste disposal facility into groundwater.

Keywords: NSDF structures, safety barriers, RW packages, distribution coefficient, release rate at the groundwater table, variation of parameter values, flow permeability, radioactive waste.

Anisimov N. A., Kuvaev A. A., Sizonenko E. V. Numerical modeling of nuclide transport in structures and the near field of a near-surface radioactive waste disposal facility. Radioactive Waste, 2023, no. 4 (25), pp. 89—100. DOI: 10.25283/2587-9707-2023-4-89-100. (In Russian).