Search academic texts

Information × Registration Number 0221U106686, 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., Доктор фізико-математичних наук Registration Date 17-12-2021 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2 The influence of non-uniform temperature distribution, radiation damage, volumetric radiation swelling, strengthening, radiation creep of the material and the production of gaseous transmutants (helium, hydrogen) on the long-term strength of the inner-vessel elements and their shape change have been determined experimentally and calculated. Predicted behavior at incubation, transitional and stationary stages of swelling of internals made of stainless steels. The methods of ion implantation and nuclear reactions were used to study the interaction of deuterium with radiation defects in austenitic stainless steel 316. The defect structure formed by preliminary irradiation of SS316 with argon ions with an energy of 1.4 MeV was characterized. The thermally stimulated redistribution of deuterium between layers with different ratios of dpa and Ar impurity served as an indicator of the strength of the traps. A calculated estimate of the deuterium capture process within the framework of the diffuse capture model made it possible to link the experimental data with specific capture centers in the material. The deformed state of the baffle of a nuclear reactor of the VVER type was determined taking into account the effect of saturation of the material with hydrogen, the corresponding equations of state, solution methods and additional software modules. A new approach is proposed to take into account the latent damage of a material when it is saturated with hydrogen. On the basis of the obtained results of computer modeling, the fields of deformations and displacements of the section of the baffle during its operation for 60 years have been analyzed, the place of possible occurrence of a macroscopic defect has been established.   Product Description popup.authors Kalchenko Oleksandr S Karpov Sergiy O Lazarev Mykola P popup.nrat_date 2021-12-17 Close