SORPTION INFLUENCE ON IODINE-129 RELEASE FROM THE DGR’S NEAR FIELD

In terms of potential long-term radiation hazard, ¹²⁹I is seen as a most problematic radionuclide, which is explained by its high mobility and long half-life. The paper explores its forms that may occur in VHLW from SNF reprocessing. It also overviews the studies focused on ¹²⁹I sorption by engineered barrier materials considered typical for DGR sited in crystalline rocks, namely, bentonite and steel containers for vitrified high-level waste. The paper shows that when considered, the realistic coefficients for the interphase ¹²⁹I distribution on bentonite and carbon steel corrosion products have little effect on its release beyond the DGR’s near field However, ¹²⁹I release into the DGR’s near field is expected to be retarded in a quite considerable way if the empty space inside the insulating containers is filled with selective sorbents.

Keywords: radionuclide transport, radioiodine, modelling, radioactive waste.

Blokhin P . A ., Bogatov S . A ., Boldyrev K . A ., Sobolev D . A . Sorption Influen e on Iodine-129 Release from the DGR’S Near Field .Radioactive Waste, 2024, no. 1 (26), pp. 57—68. DOI: 10 .25283/2587-9707-2024-1-57-68 (In Russian).