EVOLUTION OF NUCLEAR-HAZARDOUS FISSILE NUCLIDES IN VITRIFIED HIGH-LEVEL WASTE FROM PA MAYAK

The paper estimates the mass content of ²³⁹Pu and ²³⁵U in canisters with vitrified high-level waste for the time periods of 1.7·10⁴ and 10⁵ years depending on the SNF burn-ups and considering the decay of ²⁴³Am, ²⁴⁵Cm and ²³⁹Pu. Within a time period of 1.7·10⁴ years and at a SNF burn-up level of 58 GW·day/tU, the mass content of ²³⁹Pu in the canisters is expected to grow 5.5 times due to the decay of ²⁴³Am and ²⁴⁵Сm (in equivalent to ²³⁹Pu), whereas the one provided the burn-ups of 39, 34 и 24 GW·day/tU would see a 2.4, 2.0 and 2.0-fold growth accordingly. In 10⁵ years, the mass of ²³⁵U in canisters considering the SNF burn-ups of 58, 39, 34. 24 and 9 GW·day/tU is expected to grow 1.3—4.4 times compared with its initial mass in the canisters.

Keywords: radioactive waste, transuranic nuclides, evolution of nuclear fissile nuclides in vitrified high-level waste.

Baryshev A. V., Krasilnikov V. Ya., Myrzin A. F., Syrosev A. A. Evolution of Nuclear-Hazardous Fissile Nuclides in Vitrified High-Level Waste from PA Mayak. Radioactive Waste, 2024, no. 2 (27), pp. 102—107. DOI: 10.25283/2587-9707-2024-2-102-107. (In Russian).