TY CONF TI USE OF SPENT NUCLEAR FUEL IN BN-TYPE REACTORS KW spent nuclear fuel KW fast neutron reactors KW closed nuclear fuel cycle KW regeneration KW radiation safety KW high-level waste KW ecology JO INDUSTRIAL THERMAL POWER ENGINEERING AU Gogolev, V.A. AU Solzhenikin, P.A. AU Chernichenko, V.V. AU Hripynov, K.G. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov