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1. 发明专利

JP2000214287A FUEL ASSEMBLY 失效
公开(公告)号：JP2000214287A
公开(公告)日：2000-08-04
申请号：JP1196599
申请日：1999-01-20
申请人： HITACHI LTD , HITACHI ENG CO LTD , IBARAKI HITACHI JOHO SERVICE K
发明人： IRIBE MAKOTO , IMAI MASABUMI , FUKUMOTO TAKASHI , NAKAJIMA JUNJIRO , AIZAWA YASUHIRO
IPC分类号： G21C3/326 , G21C3/344
摘要： PROBLEM TO BE SOLVED: To sufficiently ensure the soundness of the structure of a spacer in a fuel assembly in which shorter fuel rods are arranged in the outermost circumference of a lattice-shaped arrangement and in a position adjacent to a water rod and in which spacer tubular members in lattice positions of the shorter fuel rods are removed so as to reduce pressure loss. SOLUTION: This fuel assembly is provided with fuel rods which contain shorter fuel rods in the outermost circumferential region. In addition, the fuel assembly is provided with a water rod. In addition, the fuel assembly is provided with fuel spacers which are installed in a plurality of places in the axial direction. In the fuel spacers in the fuel assembly which is provided with mutually coupled cells 9 and bands 11, spacers 4B which are situated in the upper part from the upper end of the shorter fuel rods in the outermost circumferential region omit cells 9 in first lattice positions 18a to 18d. The bands 11 are bonded to outer circumferential faces of the cells 9 in third lattice positions 18o to 18r other than the first lattice positions 18a to 18d and second lattice positions 18g to 18n which are adjacent to both sides of them when split pieces 11A are welded and bonded.

2. 发明专利

JPH09197080A COOLANT FLOW CONTROLLER AND FUEL ASSEMBLY 失效
公开(公告)号：JPH09197080A
公开(公告)日：1997-07-31
申请号：JP474696
申请日：1996-01-16
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TOMITA TAKASHI , AIZAWA YASUHIRO , IMAI MASABUMI , ITO KENICHI , NAKAJIMA JUNJIRO
IPC分类号： G21C3/33 , G21C3/322
摘要： PROBLEM TO BE SOLVED: To improve the mechanical reliability by reducing unnecessary contact force of flow control plates, reducing the progression of aging distortion of channel box and reducing the stress generated in coolant flow control plates and the possibility of interference during loading the channel box. SOLUTION: A flow control plate 8 as an upper flat part 8a and a lower flat part 8b provided in the vicinity of the upper end and the lower end and the middle part 8c projecting toward the channel box side rather than the upper flat part 8a and the lower flat part 8b, and half of which on the upper flat part 8a side is separated with 8 slits into 9 plate vanes 8A and 8B arranged nearly horizontally. The 9 plate vanes 8A and 8B has nearly equal thickness and width in nearly horizontal direction and 4 plate vanes 8B in the vicinity of both ends in the horizontal direction has a shape with a loss at the upper flat part 8a and is constituted only of the major part of the middle 8c and the lower flat part 8b.

3. 发明专利

JPH0949891A COOLANT LEAKAGE PREVENTION MECHANISM AND FUEL ASSEMBLY 失效
公开(公告)号：JPH0949891A
公开(公告)日：1997-02-18
申请号：JP20097795
申请日：1995-08-07
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TOMITA TAKASHI , NAKAJIMA JUNJIRO , AIZAWA YASUHIRO , IMAI MASABUMI , ITO KENICHI
IPC分类号： G21C3/30 , G21C3/322 , G21C15/02
摘要： PROBLEM TO BE SOLVED: To provide a coolant leakage prevention mechanism and fuel assembly which has good assembling work capability of leak flow control plate and ensures holding a normal swinging function in use. SOLUTION: Since an upper pressing plate 9 and another member, a guide piece 18 are formed together with a lower tieplate 6 in one, it is possible to insert the upper part of a penetration hole of a leak flow control plate 8 into the guide piece 18 formed in one together with the lower tieplate 6 and then to fix the upper pressing plate 9 to the guide piece 18 with a screw 19 in the inserted state. Therefore, there is no fear of pinching the leak flow control plate 8 between the lower tieplate 6 and the guide piece 18 and so assembling work is improved. Also in use, fixing of the leak flow control plate 8 by pinching between the guide piece 18 and the lower tieplate 6 is prevented. Thus, normal swing function is surely held.

4. 发明专利

JPH0862360A FUEL SPACER AND FUEL ASSEMBLY 失效
公开(公告)号：JPH0862360A
公开(公告)日：1996-03-08
申请号：JP19817594
申请日：1994-08-23
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA YASUHIRO , NAKAJIMA JUNJIRO , TOMITA TAKASHI , YASUJIMA MASAKICHI , IMAI MASABUMI
IPC分类号： G21C3/344 , G21C3/34
摘要： PURPOSE: To prevent the occurrence of an internal stress resulted from an irradiation growth elongation difference in a fuel spacer, because no irradiation growth elongation difference is caused between zirconium alloy members constituting the fuel space. CONSTITUTION: In the fuel assembly, the fuel spacer is fixed by a plurality of cell materials 8 forming independent unit cells for inserting and supporting fuel elements 2 in the inner part. This assembly also has support plates 10, 11 for forming a cell for inserting and supporting a water rod 3 together with the cell materials, a band 9 forming an outer frame for bundling the cell materials 8, and a spring 12 for elastically supporting the fuel elements 2 and the water rod 3, and the cell materials 8, the support plates 10, 11 and the band 9 are formed out a zirconium alloy. The index showing the directional orientation ratio of a closest hexagonal lattice, which is the crystal structure of the alloy, is set substantially equal in all the cell material 8, the support plates 10, 11 and the band 9 in the fuel spacer height direction and width direction.

5. 发明专利

JP2001141876A FUEL INSPECTION DEVICE 失效
公开(公告)号：JP2001141876A
公开(公告)日：2001-05-25
申请号：JP32210299
申请日：1999-11-12
申请人： HITACHI LTD , HITACHI ENG CO LTD , IBARAKI HITACHI JOHO SERVICE K
发明人： MACHIDA KOICHI , IIDA KOJI , MANIWA KAZUHIKO , IMAI MASABUMI , OKUDA SHINICHI , YASUDA TAKAYOSHI , SASAKI MASANA , EITO YOSHINORI
IPC分类号： G01N1/10 , G21C17/07
摘要： PROBLEM TO BE SOLVED: To provide a fuel inspection device that detects broken fuel assemblies and improves efficiency in their detection. SOLUTION: This device has a structure, where more sampling systems are provided in a sampling system than those in a shipper cap. Consequently, the device improves the efficiency of shipping work, because both the decontamination of the sampler and sampling are conducted at the same time, even if the sampling system is contaminated.

6. 发明专利

JPH08114692A FUEL SPACER AND FUEL ASSEMBLY 失效
公开(公告)号：JPH08114692A
公开(公告)日：1996-05-07
申请号：JP19944795
申请日：1995-08-04
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TOKUNAGA KENSUKE , AIZAWA YASUHIRO , NAKAJIMA JUNJIRO , SASAKI MASANA , YASUJIMA MASAKICHI , IMAI MASABUMI
IPC分类号： G21C3/33 , G21C3/344
摘要： PURPOSE: To reduce the coolant pressure loss and improve assembling capability of fuel assembly by constituting so that the axial distances between top ends of the first and the second opening regions and between top ends of the first and the second connecting parts are nearly equal and the axial distances between bottom ends of both opening regions and between bottom ends of both connecting parts are different. CONSTITUTION: As the axial distance L1 between top ends of the first and the second opening regions 13a and 13b of a round cell 6 and the axial distances between top ends of the first and the second connecting parts 30U and 30L are equal, even with an upward movement of a loop shape spring part 9 against the cell 6, the upper end of the part 30U is in contact with the top end of region 13a and so the part 9 is kept in the state where the center axis direction agrees with the coolant flow direction and coolant pressure loss is reduced. As the distance L2 between bottom ends of regions 13a and 13b is smaller than the distance S2 between bottom ends of parts 30U and 30L, the friction force in fuel element 2 insertion through near the part 9 is small and easy to insert and assembling capability is improved.

7. 发明专利

JPH10221473A COOLANT FLOW CONTROLLER AND FUEL ASSEMBLY 失效
公开(公告)号：JPH10221473A
公开(公告)日：1998-08-21
申请号：JP2134397
申请日：1997-02-04
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TOKUNAGA KENSUKE , AIZAWA YASUHIRO , IMAI MASABUMI , TOMITA TAKASHI , GOTO YASUYUKI
IPC分类号： G21C3/322
摘要： PROBLEM TO BE SOLVED: To reduce the number of parts used in a coolant flow controller by integrating a guide piece which guides the oscillation of a coolant flow control plate with a lower tie plate. SOLUTION: A lower tie-plate guide piece 18 which guides the oscillating extent of a coolant flow control plate 8 is installed to the outer side section of a lower tie plate 6. Consequently, the fixation of the control plate 8 between the guide piece 18 and tie plate 6 is eliminated. In addition, the two sides of the upper and lower thick surfaces of a keep plate 9 are physically engaged with a keep plate inserting groove 23 provided on the tie plate 6 and the right- side one of the two sides is fixed to the plate 6 by spot welding. Since no set screw is used for fixing the keep plate 9 to the plate 6, the number of parts used in a coolant flow controller is reduced and the reliability of the controller is improved. In addition, the assembling work of the controller is rationalized and the manufacturability of the controller is improved, because no screw tightening work nor the management of screw tightening forces is required.

8. 发明专利

JPH09304567A FUEL ASSEMBLY INTERVAL HOLDING DEVICE 失效
公开(公告)号：JPH09304567A
公开(公告)日：1997-11-28
申请号：JP12305696
申请日：1996-05-17
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TOMITA TAKASHI , AIZAWA YASUHIRO , IRIBE MAKOTO , IMAI MASABUMI , FUKUMOTO TAKASHI
IPC分类号： G21C3/33
摘要： PROBLEM TO BE SOLVED: To reduce the stress to be produced in a plate spring at the time of earthquake by bringing a projection into contact with the plate spring in the case where quantity of deflection of the plate spring exceeds a constant value and possessing the projection outward projected from the surface of a plate spring guard acting as the fulcrum of the plate spring. SOLUTION: The fuel assembly interval holding device 7 is constituted so that a plate spring 11 comes into contact with the project part 12a of a plate spring guard 12 at a more upper position than a weight load position in the case where the plate spring 11 is changed more than a constant value. When an interval H between the projection part 12a and the plate spring 11 indicates plate spring maximum deflection σ0 , the deflection of the flat plate of the plate spring σ1 , the deflection at a contact point between the plate spring 11 and the projection part 12a σ2 and the maximum deflection of the plate spring σmax , H≈σ0 ×(σ2 /σ1 ) is obtained.

9. 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).

10. 发明专利

JPH0735883A FUEL ASSEMBLY 失效
公开(公告)号：JPH0735883A
公开(公告)日：1995-02-07
申请号：JP17665093
申请日：1993-07-16
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YAMADA KATAHITO , AIZAWA YASUHIRO , IMAI MASABUMI , NAKAJIMA JUNJIRO , YASUJIMA MASAKICHI
IPC分类号： G21C3/33
摘要： PURPOSE:To provide a fuel assembly in which generation of eutectic is suppressed without splitting the plate while allowing highly accurate bending work and high degree of burn-up is realized by increasing the number of fuel element grids. CONSTITUTION:A resilient supporting plate 15 has right and left bent side faces 15R, 15L which are spot welded at the edges thereof, i.e., welding points L1, L2 or R1, R2, to a round cell 8. Each of the bent side faces 15R, 15L is provided with two openings 16R, 16L at substantially same height as the plate contact part 13A of a spring member 13. Consequently, the plate contact part 13A is inserted, at the end thereof, into the opening 16L when the spring member 13 is shifted to the left and into the opening 16R when the spring member 13 is shifted to the right.

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