专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

61. 发明专利

JP2000266882A NEUTRON ABSORBER FOR REACTOR CONTROL ROD, CONTROL ROD FOR REACTOR, REACTOR AND UNCLEAR POWER PLANT 失效
公开(公告)号：JP2000266882A
公开(公告)日：2000-09-29
申请号：JP6954199
申请日：1999-03-16
申请人： HITACHI LTD
发明人： FUJIEDA TADASHI , TAKASE IWAO , INAGAKI MASATOSHI , KOIZUMI AKIRA
IPC分类号： G21C7/113 , C22C27/00 , C22F1/18 , G21C7/10 , G21C7/24
摘要： PROBLEM TO BE SOLVED: To provide a neutron absorber for a reactor control rod using Hf alloy having high plastic fabrication capability and high corrosion resistance, a reactor control rod thereof, a reactor and a nuclear power plant. SOLUTION: A neutron absorber for a reactor control rod consists of Hf base alloy including Zr of 0.02 to 4.5% by weight and Hf of 95% or at least one of Cr of 0.01 to 1.0%, Fe of 0.01 to 2.0%, Sn of 0.03 to 1.5%, Nb of 0.03 to 1.5% and Mo of 0.01 to 2.0% and an oxide film is formed on the surface. As corrosion resistance of the neutron absorber in high temperature water is drastically improved, the use period of the reactor control rod in a reactor can be greatly prolonged. Furthermore, the oxide film produced on the control rod is fine, hardly removed and stable, and so the number of spent control rods can be reduced, the performance of reactivity control is maintained long and the amount of radioactive waste can be greatly reduced.

62. 发明专利

JPH11140611A PRODUCTION OF GADOLINIUM-CONTAINING ZIRCONIUM-BASE ALLOY MATERIAL 失效
公开(公告)号：JPH11140611A
公开(公告)日：1999-05-25
申请号：JP30527697
申请日：1997-11-07
申请人： HITACHI LTD
发明人： TOMITA KAZUO , NAKAJIMA JUNJIRO , FUJIEDA TADASHI
IPC分类号： G21C3/07 , B23K15/00 , B23K20/00 , C22C14/00 , C22F1/00 , C22F1/18 , G21C3/30 , G21C3/34
摘要： PROBLEM TO BE SOLVED: To obtain good joinability, Gd diffusion, corrosion-resistance and mechanical properties in a material by arranging a Gd member into the recess of a Zr-base alloy base metal subjected to solution treatment, covering the other Zr-base alloy base metal thereon, executing welding and subjecting it to hot rolling, annealing, cold rolling and final annealing. SOLUTION: A Zr-base alloy is subjected to solution treatment in which it is heated to a temp. region including the α phase and the β phase or to a temp. region of the βphase and is rapidly cooled to form into a base metal. Into a resess or a hole provided on this base metal by machining, a Gd member composed of a pure Gd or 5 to 90% Gd-contg. Zr-base alloy is engagedly arranged, and the other Zr-base alloy base metal is covered thereon, which is buried, and the environts of the joined faces of the base materials are subjected to electron beam welding with each other, and they are integrated. The obtd. composite material is subjected to hot rolling, and the Zr-base alloy base metal and the Gd member are mechanically joined at less than the α+β phase transition temp. Next, the composite material is subjected to annealing for removing working strains and cold plastic working for regulating the dimensions for several times to finish into prescribed dimensions, which is thereafter subjected to final annealing to obtain a member having prescribed strength.

63. 发明专利

JPH1048372A FUEL ASSEMBLY AND FUEL CHANNEL BOX USED THEREFOR, AND PRODUCTION THEREOF 失效
公开(公告)号：JPH1048372A
公开(公告)日：1998-02-20
申请号：JP20958296
申请日：1996-08-08
申请人： HITACHI LTD
发明人： FUJIEDA TADASHI , INAGAKI MASATOSHI , ITO KENICHI , NAKAJIMA JUNJIRO
IPC分类号： G21C3/324 , C22F1/18 , G21C3/30 , G21C3/326 , G21C7/04 , G21C21/00
摘要： PROBLEM TO BE SOLVED: To provide a reactor fuel assembly which is mixed with plutonium, capable of properly suppressing excess reactivity without mixing neutron absorber or burnable poison in the fuel rods and shows little bending and swell deformation due to irradiation growth and a channel box for it and their production method. SOLUTION: Member containing burnable poison is arranged inside a channel box 1 and the burnable poison is isolated from water. The orientation (Fl value) in the longitudinal direction in orientation of hexagonal zirconium of a zirconium base alloy plate material is set at 0.20 to 0.35 and Fl value difference between opposite surfaces of the channel box is set at 0.025 or less.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式