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Information × Registration Number 0224U033138, (0123U102965) , R & D reports Title Investigations of the effect of synthesis regimes on the hafnium diboride properties as neutron absorbing materials VVER-1000 popup.stage_title Матеріалознавчі дослідження характеристик порошків і таблеток дибориду гафнію, розрахунки фізичної ефективності поглинання нейтронів в умовах реактора ВВЕР-1000 Head Lehenkyi Yehor S., Registration Date 19-12-2024 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description1 Calculationals and materialscience researches of the synthesis of hafnium diboride from such compounds as hafnium oxide, boron, boron carbide based on thermodynamic calculations and experimental results, determination of the scheme for the manufacture of powders and pellets. popup.description2  A general description of the RCCA, absorber rod design and neutron absorbing materials for VVER-1000 and PWR reactors is presented. It is shown that the next step to improve the physical efficiency, reliability and service life of absorber rods is transition to combined use of neutron absorbing materials of dysprosium hafnate (Dy 2 O 3 ⋅HfO 2 ) and boron carbide. For PWRs operating on MOX fuel, the use of hafnium diboride (HfB 2 ) is promising. The report presents some aspects of the performance of hafnium diboride as a promising neutron absorber as compared to other neutron absorbing materials; the thermodynamic aspects of the synthesis of hafnium diboride from the starting compounds of hafnium oxide, boron and boron carbide during vacuum sintering were studied; the effect of vacuum sintering temperature on the synthesis completeness and characteristics of hafnium diboride pellets was investigated; the corrosion behavior of hafnium diboride pellets in simulated VVER-1000 reactor coolant medium at T = 350 °C and P = 16 MPa was studied; the compatibility of hafnium diboride pellets with VVER-1000 absorber rod cladding material at 1000 °C and 1200 °C was investigated; comparative calculations were performed of the physical efficiency of neutron absorption and changes in the isotopic composition of materials such as boron carbide and hafnium diboride. The scope of work under the stage has been completed in full. Product Description popup.authors Dzhamirzoiev Albert D. Dykyi Іvan V. Zuiok Valerii A. Kirsanova Olha S. Kolodii Ihor V. Kushtym Anton V. Kushtym Yana O. Lehenkyi Yehor S. Pylypenko Oleksandr V. Prokhorenko Yurii P. Romankov Viktor O Shevchenko Ihor V popup.nrat_date 2024-12-19 Close