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Information × Registration Number 0220U101923, 0119U101679 , R & D reports Title The materials of the internal components of thermal neutron reactors with a long term operation lifetime - the effect of radiation- and thermal-induced processes popup.stage_title Head Tolstolutska Galyna D., Registration Date 28-02-2020 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2 A multidimensional approximation of the reactor data by the least squares method was carried out to describe the swelling of 18Cr9Ni steel used as cladding of the fuel elements of the EBR-II reactor. The empirical function of the swelling of this steel was proposed for the temperature range of 384–507 °C, dose rates of (0.7–9.6)×10–7 dpa/s and damage doses of 4–65 dpa. Modification of this function is developed to account the transient swelling stage. The correlation between the duration of transient period and the steady-state swelling rate is observed. Maximal swelling rate of this steel in fast reactor does not exceed 0.47 %/dpa and predicted swelling rate in thermal reactor reaches 0.55 %/dpa. The region of irradiation parameters is identified, where the effect of temperature on the swelling is more significant than of the dose rate. The mathematical formulation of the problem had been done. The calculation method was improved and adapted for numerical modeling of deformation processes in nuclear reactors. The numerical evaluation of the stress-strain state of the t-pipe connection with taking into account the creep and radiation swelling of the material was preformed. The contribution of different mechanisms of deformation to the general deformed state was estimated. Product Description popup.authors Breslavsky Dmytro V. Voyevodin Victor M. Kalchenko Olekcandr S. Lazarev Mykola P. Tolstolutska Galyna D. popup.nrat_date 2020-04-02 Close