reactivity marginMinimizing Reactivity Margin of BN-1200 Reactor: Feasibility and Expediency 9/17/2026 2026 - #03 Current issues in nuclear energy Vasilyev B.A. Bogdanova E.V. Kiselev A.V.Use of erbium as a burnable absorber for the VVER reactor core life extension 9/16/2020 2020 - #03 Nuclear power plants Alassaf S.H. Savander V.I. Hassan A.A.