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1. 发明专利

JPH05172973A FUEL LOWER END PLUG 失效
公开(公告)号：JPH05172973A
公开(公告)日：1993-07-13
申请号：JP34271191
申请日：1991-12-25
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KONUKI NORIHIKO , YAMAKURA MASAYUKI , HIROSE TSUTOMU , EBIHARA ISAO
IPC分类号： G21C3/10
摘要： PURPOSE:To reduce thermal stress by improving cooling characteristic owing to a penetration hole at the fuel lower end plug of a reactor fuel where coolant flows in. CONSTITUTION:A hole 10 where coolant 6 flows in, is provided on a fuel lower end plug 4 to reduce the temperature rise at the fuel lower end plug 4 and thermal stress generating on the lower end plug welding part 5.

2. 发明专利

JPH02154193A FUEL ASSEMBLY 失效
公开(公告)号：JPH02154193A
公开(公告)日：1990-06-13
申请号：JP30783088
申请日：1988-12-07
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SUZUKI SHUJI , KONUKI NORIHIKO , TOKUNAGA KENSUKE
IPC分类号： G21C3/10 , G21C3/33
摘要： PURPOSE:To safely and easily withdraw a fuel element from a fuel assembly by tapering the shank part of a lower end plug of the fuel element or the insertion hole of the lower end plug of a lower tie plate. CONSTITUTION:The fuel element is constituted of the lower end plug 1, the upper end plug 2, a cladding pipe 3 and fuel pellets 4. This fuel element is inserted into the lower end plug insertion hole 7 of the lower tie plate 5 of the fuel assembly. The shank part 6 of the end plug 1 or the insertion hole 7 is tapered. Even if oxide films form and deposit on the shank part 6 or in the insertion hole 7 on progression of combustion, the spacing between the shank part 6 and the insertion hole 7 is assured and the safe and easy withdrawing of a plate 5 is executed.

3. 发明专利

JP2002116288A REACTOR FUEL ROD AND ITS PRODUCTION METHOD 失效
公开(公告)号：JP2002116288A
公开(公告)日：2002-04-19
申请号：JP2000313109
申请日：2000-10-06
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KONUKI NORIHIKO , TAKAHASHI MASANORI , FUKAZAWA TETSUO , SASAHIRA AKIRA
IPC分类号： G21C21/04 , G21C3/62
摘要： PROBLEM TO BE SOLVED: To reduce the process for producing fuel rods with many regions in the axial direction by filling particulate fuel and giving vibration. SOLUTION: In a method for producing fuel rods with different composition in the axial direction in a vibration compaction process, two kinds of compositions of large diameter particles 10-1 for lower part and upper part and large diameter particles 10-2 for middle part are employed, and one kind of composition of small diameter particles 11 is employed. From the bottom of a clad 1, the large diameter particles 10-1, the large diameter particles 10-2 and the small diameter particles 11 are packed in turn. Then, by giving vibration with a vibration generator 4 and making the small diameter particles 11 which permeate lower, fuel regions with uniform density and different compositions in the axial direction can be produced in a single process consisting of packing and vibrating of particle fuel.

4. 发明专利

JPH0829568A FUEL ASSEMBLY 失效
公开(公告)号：JPH0829568A
公开(公告)日：1996-02-02
申请号：JP16770094
申请日：1994-07-20
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KONUKI NORIHIKO , IMAI MASABUMI , NAKAJIMA JUNJIRO , YASUJIMA MASAKICHI , IZUTSU SADAYUKI
IPC分类号： G21C3/18 , G21C3/326
摘要： PURPOSE:To reduce the inner pressure of fuel rod while avoiding contact of a plenum spring with the outer circumferential part of fuel pellet and the inner surface of fuel cladding tube by eliminating a wafer at the upper part of the fuel pellet and bringing the plenum sprung into contact with the top face of the fuel pellet thereby increasing the spatial volume at the plenum part. CONSTITUTION:A plenum spring 9 is tapered conically at one end thereof on the side touching a fuel pellet 7 in order to prevent the spring 9 from touching the outer circumference of the pellet 7 and crackling. Furthermore, the most forward end part of the spring 9 is prevented from touching the inner ace of a fuel cladding tube 10 thus ensuring the mechanical soundness thereof. In this regard, an upper end plug 11 and the end part touching the pellet 7 are ground horizontally to increase the contact area thus enhancing the heat transmission performance and the mechanical soundness. Furthermore, the spring 9 on the pellet 7 side employs a tight contact structure of 4-12mm long forming a hollow tubular solid thus enhancing thermal neutron absorption of short fuel rod and reducing the output spike (output at the upper end of short fuel rod increases).

5. 发明专利

JPH01227991A FUEL ASSEMBLY 失效
公开(公告)号：JPH01227991A
公开(公告)日：1989-09-12
申请号：JP5354988
申请日：1988-03-09
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA YASUHIRO , YAMADA KATAHITO , HIRAKAWA HIROMASA , KONUKI NORIHIKO
IPC分类号： G21C3/324 , G21C3/30 , G21C21/00
摘要： PURPOSE:To prolong the life of a channel box by increasing the thickness in the corner parts of the channel box with respect to the thickness in the lateral center parts. CONSTITUTION:The angle parts (corner parts) in the cross section of the channel box 1 is formed to the thickness larger than the thickness in the lateral center parts. The bottom end regions l to be fitted to a lower tie plate are formed to the thickness uniform in the cross section and is the same thickness as the thickness of the thick angle parts. The angle parts are formed to such thickness at which said parts is thicker 1.4-1.7 times the lateral center parts in such a manner that guide rollers 10 of a control rod 9 faces the thin lateral center parts if the diameter of the guide rollers 10 is relatively large and that the guide rollers face the thick angle parts if said diameter is relatively small. The stresses and deformation of the channel box are thereby decreased without increasing the volume thereof and the life of the channel box is improved without degrading the economy of neutrons.

6. 发明专利

JP2004101199A Oscillation-packing type atomic reactor fuel rod 审中-公开
标题翻译：振动包装型原子反应堆燃料油
公开(公告)号：JP2004101199A
公开(公告)日：2004-04-02
申请号：JP2002259237
申请日：2002-09-04
申请人： Hitachi Ltd , Japan Nuclear Cycle Development Inst States Of Projects , 株式会社日立製作所 , 核燃料サイクル開発機構
发明人： SUZUKI MASAHIRO , ISHII KATSUNORI , HINAI HIROSHI , SHIGETOME YOSHIAKI , KONO SHUSAKU , SASAHIRA AKIRA , KONUKI NORIHIKO
IPC分类号： G21C3/26 , G21C3/62 , G21C21/04
CPC分类号： Y02E30/34 , Y02E30/38
摘要： PROBLEM TO BE SOLVED: To reduce the kinds of fuel particles, to enhance the filling ratio, to improve a yield, and to reduce a manufacturing cost.
SOLUTION: The atomic reactor fuel rod forms a fuel area 16 of a predetermined fuel density by loading fuel particles in a cladding tube 10, and applying oscillation thereto, and seals both ends of the cladding tube by end plugs 18 and 20. The fuel particles loaded in the cladding tube consist of spherical fuel particles and monolithic lump-shaped fuel particles. The grain size of the spherical fuel particles is larger than the grain size of the monolithic lump-shaped fuel particles, and both kinds of fuel particles are mixed in a substantially uniform manner. For example, there are two kinds, i.e., spherical fuel particles 30 of large grain size and monolithic lump-shaped fuel particles 34 of small grain size. The grain size of spherical fuel particles is 700-1,000 μm, and the grain size of monolithic lump-shaped fuel particles is ≤100 μm, and the charging ratio of spherical fuel particles is 50-70 wt.%.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了降低燃料粒子的种类，提高填充率，提高收率，降低制造成本。解决方案：原子反应堆燃料棒通过在包壳管10中加载燃料颗粒并施加振动而形成具有预定燃料密度的燃料区域16，并通过端塞18和20密封包层管的两端。装载在包层管中的燃料颗粒由球形燃料颗粒和整体块状燃料颗粒组成。球形燃料颗粒的粒度大于单块块状燃料颗粒的粒径，并且两种燃料颗粒以基本均匀的方式混合。例如，具有大粒径的球形燃料粒子30和小粒径的整体块状燃料粒子34有两种。球形燃料颗粒的粒径为700-1,000μm，单块块状燃料颗粒的粒径≤100μm，球形燃料颗粒的装料率为50-70wt％。版权所有（C）2004，JPO

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