Registration Number
0223U005386,
(0122U001511)
, R & D reports
Title
Development of power control methods for the perspective fast reactor with a wave of nuclear burning and modeling of materials for nuclear power of the next generation
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Дослідження впливу вигоряння продуктів ядерного поділу на потужність реактора з хвилею ядерного горіння. Розрахунок швидкості зародження кристалічної фази в склі, що використовується для вітрифікації радіоактивних відходів.
Head
Bakai Oleksandr S., Доктор фізико-математичних наук
Shulha Mykola F., Доктор фізико-математичних наук
Registration Date
22-12-2023
Organization
National Science Center "Kharkiv Institute of Physics and Technology"
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The main purpose of the project is to develop a methodology for safe and reliable power control of a perspective fast breeder reactor with a mixed thorium-uranium fuel, operating in a self-sustaining mode of a nuclear burning wave, by means of tuning of the efficiency of the radial neutron reflector, i.e. its component composition.
The behavior of promising reactor core materials will also be studied, namely, the processes of clusterization of primary radiation defects and the influence of the production asymmetry of free migrating point defects on phase stability in compositionally complex alloys under irradiation, the long-term thermal stability of glass used for radioactive waste vitrification.
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1. We developed a computer program that calculates the equation of nuclide transmutation under the influence of a variable neutron flux to study the dependence of the averaged microscopic cross section (AMCS) of fast neutron capture by nuclear fission products on the neutron fluence in a nuclear burning wave (NBW) reactor. The linear dependence of AMCS on the neutron fluence was found and its parameters were determined. The study of the NBW phenomenon in this work was performed using the original FANTENS-2D computer code, which was modified to take into account the change of AMCS of the fission products with the level of fuel burnout. We made calculations of the NBW motion at a given power (which is set by ajusting the concentration of the Ta-181 neutron absorber in the radial reflector), both taking into account the AMCS dependence on the level of fuel burnout and neglecting it. It is shown that the change of AMCS of the fission products demands the increase of the amount of neutron absorber, which must be added to the radial neutron reflector to stabilize the NBW reactor power at a given level.
2. Based on the experimental data for the 5BaO∙8SiO2 (B5S8) model glass, the rate of crystal nucleation and growth was calculated as a function of the degree of structural relaxation and temperature. It is shown that glass relaxation and its temperature dependence must be taken into account when determining the possibility and rate of crystallization in glasses used for RAW vitrification. We demonstrate that glasses with a high crystallization rate, such as stoichiometric barium silicate B5S8, may not reach the final steady state of crystal nucleation at temperatures below the glass transition threshold, but may fully crystallize earlier. Taking into account the relaxation by one parameter within the classical nucleation theory allows to derive the crystalline phase volume fraction, its growth rate and the average crystal size.
Product Description
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Abyzov Olexander S
Bakai Oleksandr Stepanovych
Borysenko Oleksandr O.
Davydov Leonid M.
Lazarev Mykola P.
Malovytsia Maksym S.
Pilipenko Volodymyr V.
Turkin Anatoliy A.
Fomin Serhii P.
Shulha Mykola F.
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2023-12-22
