1. Peculiarities of Changes in the Isotopic Composition of Pilot Fuel Elements of a VVER-SKD Reactor under Successive Irradiation in a Fast and Thermal Neutron Spectrum.
- Author
-
Blandinsky, V. Yu., Kolesov, V. V., Nevinitsa, V. A., Fomichenko, P. A., Sedov, A. A., Frolov, A. A., Pustovalov, S. B., Shchurovskaya, M. V., Simonov, S. S., Pesnya, Yu. E., Trofimchuk, V. V., Nasonov, V. A., and Zhemkov, I. Yu.
- Subjects
- *
NUCLEAR fuel elements , *THERMAL neutrons , *FAST neutrons , *FAST reactors , *RESEARCH reactors , *ABSORPTION cross sections , *IRRADIATION , *NUCLEAR reactors , *NUCLEAR fuel rods - Abstract
The paper considers the methodological aspects of experiments planning on the irradiation of experimental fuel rods of a VVER-SKD reactor and analyzes the features of the concept of sequential irradiation in fast and thermal reactors. It is shown that the 149Sm accumulated at the irradiation in the BOR-60 plays the role of a burnable absorber at the initial stage of irradiation in the reflector cell of the IR-8 reactor. This absorber quickly burns out owing to large absorption cross section and its concentration gradually comes to equilibrium. Burnup of 149Sm leads to a gradual increase in the linear load of the irradiated experimental fuel rod, followed by a decrease and reaching the equilibrium irradiation regime. This effect must be considered when planning the irradiation regime for experimental fuel elements of the VVER-SKD reactor. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF