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31. 发明专利

JPS54105684A NUCLEAR FUEL ROD 失效
公开(公告)号：JPS54105684A
公开(公告)日：1979-08-18
申请号：JP1193578
申请日：1978-02-07
申请人： TOKYO SHIBAURA ELECTRIC CO
发明人： NAKATSUKA MASAFUMI
IPC分类号： G21C3/26 , G21C3/28 , G21C3/62
摘要： PURPOSE:To improve reliability and minimize probability causing stress corrosion crack of sheath tube by mixing coated particle shape nuclear fission material having coating film to contain EP gas within a part of fuel pellet. CONSTITUTION:Slender diameter feeder 54 is provided for the low section of container 50 containing anhydrous n-hexanol, from which sol fission material 56 is introduced into n-hexanol 52. Anhydrous n-hexanol extracts water from sol fission material to produce nuclear fission microball and accumulate in the bottom section 58 of container. The produced particle is delivered into pipe and conveyed to the revolving type heater 64 to dry, which is then recovered into a proper container 68 allowing then for coating of silicon carbide. EP gas produced by nuclear fission of particle where a part of fuel pellet is processed by granular sheath treatment is contained within the particle.

32. 发明专利

JPS5267484A FUEL ELEMENT FOR GAS COOLED TYPE REACTOR 失效
公开(公告)号：JPS5267484A
公开(公告)日：1977-06-03
申请号：JP14347575
申请日：1975-12-01
申请人： KAWASAKI HEAVY IND LTD
发明人： KOIKE HIROYUKI
IPC分类号： G21C3/26 , G21C1/10
摘要： PURPOSE:To obtain a fuel element of a gas-cooled type reactor capable of even cooling with certainty, the reactor having an inner shell of a cylinder and coolant gas passages and containing ring vessels sealed by coated particle fuel.

34. 发明申请

US20200043617A1 CONTROL ROD GUIDE ASSEMBLY WITH ENHANCED STIFFNESS, FUEL ASSEMBLY INCLUDING THE SAME, AND METHOD OF INSTALLING CONTROL ROD GUIDE ASSEMBLY 审中-公开
公开(公告)号：US20200043617A1
公开(公告)日：2020-02-06
申请号：US16558510
申请日：2019-09-03
申请人： WESTINGHOUSE ELECTRIC COMPANY, LLC
发明人： YURIY ALESHIN , BRIAN MILLARE , MICHAEL O. BAUSCH , CARTER ELIOT LUNDE
IPC分类号： G21C3/332 , G21C3/26 , G21C7/20 , G21C3/326 , G21C3/334 , G21C7/12 , G21C9/02
摘要： A nuclear fuel assembly comprising a plurality of control rod guide assemblies. At least one of the control rod guide assemblies includes a guide tube having an axial dimension, the guide tube being supported by the plurality of grids and extending axially between the top nozzle and the bottom nozzle, the guide tube having an upper portion having a first radius and a lower portion having a second radius less than the first radius, and an external dashpot tube disposed around a portion of the lower portion in an area beginning at the bottom grid and extending toward the top nozzle.

39. 发明专利

JPH0472594A OXIDE NUCLEAR FUEL ROD 失效
公开(公告)号：JPH0472594A
公开(公告)日：1992-03-06
申请号：JP18572690
申请日：1990-07-13
申请人： MITSUBISHI ATOMIC POWER IND , NIYUUKURIA DEBEROTSUPUMENTO KK
发明人： HARADA YUHEI , TAKAHASHI TOSHIMICHI
IPC分类号： G21C3/26
摘要： PURPOSE:To favorably transmit heat to smooth the distribution of burnup by vibration-packing nuclear fuel rods to be assembled to a fuel assembly and to be arranged in a reactor core by means of pellets of high density and large grain diameter in the center part of the cove. CONSTITUTION:Nuclear fuel pellets 2 are loaded along center positioning rods 8 inserted inside a fuel clad tube 3 on a vibration-packing device 10, and after spherical fuel elements 6 are packed in a circular cavity in the tube, a coil spring 11 is arranged on the top of end pellet 2, and the top is sealed by welding an end plug 5. Pellets of high density and large grain diameter are used for the nuclear fuel pellets 2, the spherical fuel elements 6 of three types of diameter 1mm, 0.2mm, 4 microns or less are vibration-packed to draw out the center positioning rods 8 slowly, and thus the spherical fuel elements are packed around the outer periphery of the nuclear fuel pellets to give fluid plasticity to the outer peripheral part. Thus, the temperature of the whole fuel rod can be reduced to smooth the distribution of burnup.

40. 发明专利

JPH01202689A NUCLEAR FUEL ELEMENT 失效
公开(公告)号：JPH01202689A
公开(公告)日：1989-08-15
申请号：JP2822588
申请日：1988-02-09
申请人： NIPPON NUCLEAR FUELS
发明人： SUGIHARA ATSUSHI
IPC分类号： G21C3/06 , G21C3/26
摘要： PURPOSE:To avoid directly touching fissionable gas on the outer walls of a coating pipe by filling the inner cylinder of a cylindrical vessel with nuclear fuel powder composed of inner and outer double walls while filling the circular gap between both inner and outer cylinders with helium gas. CONSTITUTION:The inner cylinder 11a of a cylindrical vessel 11 composed of inner and outer double walls is filled with nuclear fuel powder 12, and a gap of 0.2mm is formed between the inner cylinder 11a and the outer cylinder 11b. Further, when the powder 12 is supplied in the inner cylinder 11a, a cover 11c is fused therewith in helium gas while the circular gap between the inner and the outer cylinders is filled with helium gas. At the time of nuclear fission of BWR fuel, fissionable gas is held so as not to increase inner pressure while heat is taken out by helium gas from the circular space and the powder 12. Therefore, the action for the outer cylinder 11b caused by the fissionable gas can be avoided.

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