公开(公告)号：EP3951799A1

公开(公告)日：2022-02-09

申请号：EP20819270.8

申请日：2020-03-05

申请人： Joint-Stock Company "Machinery Manufacturing Plant"

发明人： VOYTENKO, Maksim Yur'yevich ,  KARPEEVA, Anastasiya Evgen'evna ,  PAHOMOV, Dmitriy Sergeevich ,  SKOMOROHA, Andrey Evgen'evich ,  TIMOSHIN, Ignat Sergeevich

IPC分类号： G21C3/62 ,  C01G43/025 ,  G21C21/02

摘要： The invention relates to the nuclear industry, and more particularly to a technique for producing a ceramic nuclear fuel for nuclear reactor fuel rods. A method for producing nuclear fuel pellets with a burnable absorber includes preparing triuranium octoxide with a burnable absorber, preparing a molding powder, compression molding, sintering and polishing. Gadolinium hydroxycarbonate Gd(OH)CO 3 ·xH 2 O (or Gd(CO 3 ) 3 ·xH 2 O) is used as the burnable absorber. The compression molded fuel is sintered in reducing environments (inter alia with the addition of N 2 ), and gases supplied are saturated with water vapour, wherein the humidity of the sintering atmosphere is from 8000-15000 ppm (depending on the amount of burnable absorber), and the sintering temperature is 1650-1750°C. The amount of burnable absorber in the fuel pellets is 1.50-12.00 wt%. During the stage of preparing a homogeneous charge, triuranium octoxide powder and/or triuranium octoxide with gadolinium is added in an amount up to 30 wt% to uranium dioxide powder. The technical result of the invention is an increase in the oxygen coefficient values (the ratio of the number of oxygen atoms covalently bonded with uranium to the number of uranium atoms) in the fuel pellets, thus leading to an increase in thermal conductivity and a reduction in fuel pellet deformation in a nuclear reactor.