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- Title
Comparative Analysis of Irradiation Swelling Models for the Stress-Strain State Evaluation of the WWER-1000 Baffle.
- Authors
Makhnenko, O. V.; Kandala, S. M.; Savyts'ka, E. M.
- Abstract
Assessment of the service life of internal devices operating under the influence of ionizing radiation is the actual task for prolongating safe operation of WWER-1000 NPP power units. It is necessary to take into account such physical processes as irradiation swelling and irradiation creep, which for a long-term operation can significantly affect the distortions and structural integrity of the internals. The comparative evaluation of irradiation swelling in the material of the internal baffle of the WWER-1000 reactor, obtained as a result of mathematical modeling by various known models of irradiation swelling in 08Cr18Ni10Ti austenitic steel and its analog AISI 304, was conducted. Four physical models are considered, which take into account neutron dose, dose rate, irradiative temperature, stress state and the irradiation creep of the baffle material. For all considered models, the effect of these factors on predicted irradiation swelling in the baffle after long-term operation up to 60 years is analyzed. The results of the comparative analysis showed that in models that do not take into account the process of irradiation creep, the maximum stresses in the baffle can reach the yield strength of the irradiated material (up to 800 MPa), and this will contribute to excessive conservatism in assessing the strength of internals. The model regulated by NNEGC "Energoatom" for computational evaluation of irradiation swelling in internals, taking into account the accumulated dose, irradiation temperature, stress state, and process of radiation creep in the material, is rather conservative and correlates well with the results of other models in the range of input parameters, which are characteristic for operating modes of the WWER-1000 power units, namely, in the range of maximum temperatures of the baffle material 380–390°C and the accumulated dose for 60 years of operation is not more than 120 dpa.
- Subjects
STRAINS &; stresses (Mechanics); SWELLING of materials; CREEP (Materials); IRRADIATION; AUSTENITIC steel; IONIZING radiation
- Publication
Strength of Materials, 2021, Vol 53, Issue 5, p699
- ISSN
0039-2316
- Publication type
Article
- DOI
10.1007/s11223-021-00334-7