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Information × Registration Number 0226U000483, (0124U000451) , R & D reports Title Improvement of heat-dissipating properties and neutron-absorbing elements of active zones of nuclear power plant reactors for of domestic nuclear technologies during the post-war modernization and development of Ukraine's nuclear power industry. popup.stage_title Визначення інтервальних і поліноміальних регресійних моделей залежностей показників властивостей і ресурсних характеристик цирконієвих оболонок твелів і гафнієвих пелів від твердих і газових домішок в них та оптимізація цих показників і характеристик. Head Yefimov Oleksandr V., д.т.н. Registration Date 11-01-2026 Organization National Technical University "Kharkiv Polytechnic Institute" popup.description1 The goal of the project is to improve, based on the use of interval and polynomial regression models for processing of experimental data, physico-mechanical and physico-chemical properties of fuels and pellets, their assemblies and clusters of active zones of nuclear reactors of NPPs using thermal neutrons with water under pressure, from the indicators of which directly depends on the nuclear and radiation safety of the NPP under the conditions of normal operation and under the conditions of design and pre-design accidents with the loss of the coolant of the first circuit of the LOCA or SBO type, which can lead to melting of the active zone of the reactor. popup.description2 Scientific research on the second stage of the topic M3022 aimed to determine interval and polynomial regression models of the dependence of indicators of properties and resource characteristics of zirconium fuel cladding and hafnium pellets on solid and gas impurities, and to optimize these indicators and characteristics. The object of research is the fuel elements (fuel rods) and their assemblies and neutron-absorbing elements (pellets) of the control bodies of the active zones of thermal neutron nuclear reactors withpressurized water of double-circuit nuclearpower plants witha campaign length of 6-7years and the physicochemical processes occurring in them during operation. The subject of research is the physicomechanical and physicochemical properties (impact strength,hardness,microhardness,corrosion resistance,radiation resistance,heatresistance,resourcecharacteristics) of zirconium fuel cladding, fuel assembly components and hafnium neutron-absorbing rods (pellets) and their clusters of domestic post-war production in cooperation with the Westinghouse concern based on Ukrainian nuclear technologies for the cores of VVER reactors (PWR) with a campaign length of 6-7 years, as well as mathematical models built using interval regression analysis methods used to assess and optimize these properties. The purpose of the fundamental research work is to improve, based on the use of interval and polynomial regression models for processing of experimental data, physico-mechanical and physico-chemical properties of fuels and pellets, their assemblies and clusters of active zones of nuclear reactors of NPPs using thermal neutrons with water under pressure, from the indicators of which directly depends on the nuclear and radiation safety of the NPP under the conditions of normal operation and under the conditions of design and pre-design accidents withthe lossofthe coolant of the first circuit of the LOCAor SBO type, whichcan lead to melting of the active zone of the reactor Product Description popup.authors Potanina Tetiana V Mykola M. Pylypenko Vadym O. Diahilіev Petro V. Lifshyts Henadii L. Khavin Tetiana A. Harkusha Oleksandr V. Chyzhyk Ihor D. Sydorkin Oleksandr I. Zhydetskyi popup.nrat_date 2026-01-11 Close