Radiation thermal processes in Cr13Mo2NbVB steel - the material of the fuel assembly shell in reactor BN-350 under mechanical tests

International Scientific Conference on "Radiation-Thermal Effects and Processes in Inorganic Materials"

材料科学;物理学

Larionov, A.S.^1 ; Dikov, A.S.^1 ; Poltavtseva, V.P.^1 ; Kislitsin, S.B.^1 ; Kuimova, M.V.^2 ; Chernyavskii, A.V.^2

Institute of Nuclear Physics, Almaty, Kazakhstan^1

National Research Tomsk Polytechnic University, Tomsk, Russia^2

关键词: Ductile-brittle mechanisms;    Fuel assembly;    Spent fuel assemblies;    Spent nuclear fuels;    Structural-phase state;    Temperature and force;    Thermal hardening;    Thermal process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/81/1/012035/pdf
DOI  :  10.1088/1757-899X/81/1/012035

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Regularities of changes of structural-phase state and mechanical properties of steel 13Mo2NbVB - the material of the fuel assembly shell in reactor BN-350 after various mechanical tests at 350°C are experimentally studied. The formation of microprecipitations FeMo, enriched or depleted with molybdenum was found in the short-time mechanical tests, which is the cause of thermal hardening of irradiated Cr13Mo2NbVB steel and its destruction by the ductile-brittle mechanism. On the basis of long-time creep tests it was shown that the material of the spent fuel assembly shell has sufficient resource for long-time storage in the temperature and force conditions simulating long-time storage of spent nuclear fuel.