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1. 发明专利

JPH09178877A GUIDING METHOD FOR CONTROL ROD 失效
公开(公告)号：JPH09178877A
公开(公告)日：1997-07-11
申请号：JP34030595
申请日：1995-12-27
申请人： HITACHI LTD
发明人： KASHIWAI SHINICHI , CHAGI MASAO , ORII AKIHITO
IPC分类号： G21C7/113 , G21C7/16
摘要： PROBLEM TO BE SOLVED: To provide a guiding method for the lower section of the control rod of a reactor using a coolant guide pipe and preventing reduction in the buckling strength and vibration preventing function of the control rod. SOLUTION: For the first means, a control rod guide pipe having faces parallel with the vanes of a control rod 14 and having the same drive stroke as that of the control rod 14 on the whole length is held by coolant guide pipes 20, and the control rod 14 is guided by the control rod guide pipe and guide rollers 40 provided at the lower sections of the control rod vanes. For the second means, the control rod 14 is guided by the coolant guide pipes 20 and the guide rollers 40 provided between the vanes of the control rod 14 and capable of changing the attitude to the horizontal state and the inclined state with an operation shaft 34 and a presser plate 36.

2. 发明专利

JPH08160174A FUEL ASSEMBLY 失效
公开(公告)号：JPH08160174A
公开(公告)日：1996-06-21
申请号：JP29811494
申请日：1994-12-01
申请人： HITACHI LTD
发明人： ORII AKIHITO , KAWASAKI TERUFUMI , NISHIDA KOJI , KANAZAWA TORU , KASHIWAI SHINICHI , NAGAYOSHI HIROYUKI , CHAGI MASAO
IPC分类号： G21C3/34
摘要： PURPOSE: To attain operation in high power and high burnup of fuel by providing a fuel spacer with grid frame forming grid spaces, support parts for elastically supporting fuel rods and projections extending to fuel rod axis direction. CONSTITUTION: In a grid frame 41, a grid space 44 to which a fuel rod 3 is to be inserted is formed, and in the grid frame 41, projections 45 are provided so as to surround the fuel rod 3. The fuel rod 3 is elastically supported by support parts consisting of stoppers 42 and springs 43. As the projections 45 exist in the coolant flow path as parts extending in the fuel rod axis direction so as to surround the fuel rod surface, the steam flow toward the fuel rod 3 surface is promoted and the coolant flowing in the coolant flow path especially droplets accompanying the steam flow are efficiently captured by liquid film flowing up along the fuel rods 3. Therefore, the thickness of liquid film increases and the limit power of fuel assembly is improved.

3. 发明专利

JPH06331771A SPACER FOR FUEL ASSEMBLY 失效
公开(公告)号：JPH06331771A
公开(公告)日：1994-12-02
申请号：JP11951193
申请日：1993-05-21
申请人： HITACHI LTD
发明人： KASHIWAI SHINICHI , ORII AKIHITO , KAWASAKI TERUFUMI , NAGAYOSHI TAKUJI
IPC分类号： G21C3/344
摘要： PURPOSE:To obtain a spacer having low pressure loss and excellent in limit output characteristics and workability by forming the fuel rod holding part while bending a lead spring inward along the upper and lower end faces of a round cell. CONSTITUTION:A leaf spring 40 is assembled, back to back, with another leaf spring 40 or a leaf spring having other shape the leaf spring 40 embraces two short round cells 32 with upper and lower linear parts 41 being disposed in a coolant channel defined by four short round cells 32 in order to regulate the lateral movement. The linear part 41 is provided, at the upper and lower ends thereof, with horizontally stretching parts having bent parts being fitted to the short round cell 32 such that the projection area is shaded by the short cell 32. Consequently, the end face of the cell 32 functions to reduce the projection area of the leaf spring 40 and to regulate the vertical movement of the leaf spring 40. The part projecting to the inside of the cell 32 forms the fuel rod holding part. In the assemblage of spacer, the cells 32 arranged laterally in a row are welded each other.

4. 发明专利

JPH06186367A FUEL SPACER 失效
公开(公告)号：JPH06186367A
公开(公告)日：1994-07-08
申请号：JP33579692
申请日：1992-12-16
申请人： HITACHI LTD
发明人： ORII AKIHITO , KAWASAKI TERUFUMI , KASHIWAI SHINICHI
IPC分类号： G21C3/344
摘要： PURPOSE:To enhance the limit output of reactor core by adhering liquid droplets existing in steam flow not to the curved part of a spacer 3 but to a fuel rod and increasing the quantity of liquid droplet flowing along the fuel rod and adhering to a liquid film thereby increasing the flow rate of liquid film and the thermal margin. CONSTITUTION:A protrusion 21 is formed toward the fuel rod 1 side on the upstream side of the curved part 31 of a spring 3 protruding into a space defined by a cell 2 and the fuel rod 1 while covering the curved part 31.

5. 发明专利

JPH05346476A 失效
公开(公告)号：JPH05346476A
公开(公告)日：1993-12-27
申请号：JP15643592
申请日：1992-06-16
申请人： HITACHI LTD
发明人： ORII AKIHITO , YOKOMIZO OSAMU , KASHIWAI SHINICHI , NISHIDA KOJI , KANAZAWA TORU , NAGAYOSHI TAKUJI
IPC分类号： G21C3/344
摘要： PURPOSE:To obtain a fuel spacer of a fuel assembly for a boiling water reactor in which the maximum output is improved without increasing a project area. CONSTITUTION:A round cell 10 of a corner part of a fuel spacer is lengthened axially and a fuel rod 3 of the corner part thereof is axially long covered within the round cell 10. The maximum output of a reactor core is improved by protecting a liquid film of a fuel rod surface at a position easy of boiling transition within the cell 10 without increasing a project area of the fuel spacer. In addition, an upper two-phases flow pressure loss of the fuel assembly can be reduced and the stability of the reactor core is also improved.

6. 发明专利

JPH0540187A FUEL ROD 失效
公开(公告)号：JPH0540187A
公开(公告)日：1993-02-19
申请号：JP19638291
申请日：1991-08-06
申请人： HITACHI LTD
发明人： NISHIDA KOJI , YOKOMIZO OSAMU , KASHIWAI SHINICHI , KARASHI SHIGEKI , KANAZAWA TORU , ORII AKIHITO , MUROTA TOMOYA
IPC分类号： G21C3/28 , G21C3/328
摘要： PURPOSE:To improve the degradation in core stability caused by thining of fuel rod diameter in the shift from 9X9 grid array to 10X10 grid array fuel assembly. CONSTITUTION:A fuel rod 1 which is provided in the lower heated length with low thermal diffusivity fuel pellets 4 added with a low thermal diffusivity material and in the upper heated length without adding the low thermal diffusivity material. A fuel rod in which thermal resister is inserted in the lower heated length between fuel pellets 3 and fuel clad 2 and not in the upper heated length. A fuel rod which has a large diameter in the lower heated length and a small diameter in the upper heated length. A fuel assembly is constituted of these plurality of fuel rods 1 provided with gas plenum in the lower part of the fuel rod 1. The region with large time constant in the fuel rod is limited to below 6/24 of the heated length of the fuel rod 1.

7. 发明专利

JPH0376717B2 失效
公开(公告)号：JPH0376717B2
公开(公告)日：1991-12-06
申请号：JP24401683
申请日：1983-12-26
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , MURATA SHIGETO , UTAMURA MOTOAKI , KASHIWAI SHINICHI , YOKOYAMA ITSUKI , KOTANI KOICHI , YAMAUCHI ATSUO
IPC分类号： G21C7/00 , G21C17/00

8. 发明专利

JPH03170090A WATER ROD OF FUEL ASSEMBLY 失效
公开(公告)号：JPH03170090A
公开(公告)日：1991-07-23
申请号：JP30863489
申请日：1989-11-28
申请人： HITACHI LTD
发明人： ORII AKIHITO , YOKOMIZO OSAMU , NAKAO SHUNJI , KASHIWAI SHINICHI , MASUHARA YASUHIRO , NISHIDA KOJI , SOMA HISASHI
IPC分类号： G21C3/33
摘要： PURPOSE:To remove the heat from a structure which is heated to a high temp. in a water rod by heat transfer to prevent the structure from attaining a high temp. with a construction of decreased welding points by providing a downcomer to form a coolant descending flow passage and a retaining pipe to press the downcomer to the inside wall of a riser. CONSTITUTION:The downcomer 7 forms the coolant descending flow passage 3 and is retained by the retaining pipe 11 so as to come into tight contact with the inside wall of the riser 6. The retaining pipe 11 is in tight contact with the inside wall of the riser 6 exclusive of the part retaining the downcomer 7. The coolant flows in from a coolant inflow port 2, passes a hole 12, rises in a rising flow passage 1 and flows into an inlet hole 14 of the downcomer 7. The coolant flows down in a down flow passage 3 and is discharged to the outside from a coolant discharge hole 4. The downcomer 7 increases the quantity of the heat removal of the coolant of the saturation temp. (284 deg.C) flowing on the outer side of the riser 6 through the retaining pipe 11 and the riser 6. The temp. on the inside wall of the downcomer 7 is thus lowered. The tensile strength of the zircalloy used for this water rod rapidly degrades against a temp. rise. The degradation in the tensile strength by the temp. rise is, therefore, suppressed when the water rod is constituted of the zircalloy. The hydrogen embrittlement and corrosion, etc., of the downcomer 7 are prevented.

9. 发明专利

JPH02198393A FUEL ASSEMBLY 失效
公开(公告)号：JPH02198393A
公开(公告)日：1990-08-06
申请号：JP1616289
申请日：1989-01-27
申请人： HITACHI LTD
发明人： NAKAO SHUNJI , YOKOMIZO OSAMU , KASHIWAI SHINICHI , TOMIYAMA AKIO , NISHIDA KOJI , ORII AKIHITO
IPC分类号： G21C3/326 , G21C3/32 , G21C7/27
摘要： PURPOSE:To facilitate control of a void rate of a reactor core by providing a fuel assembly with a coolant passage connected to a coolant discharge opening, a coolant climb passage connected to a lower region and a coolant drop passage connected to the coolant passage. CONSTITUTION:A great part of cooling water fed to a fuel assembly 20 is introduced to a passage 23 of the fuel assembly 20 through a through hole 18 provided in a fuel hold part 16 of a lower tie plate, and the residual cooling water is allowed to flow in a water rod 31. Part of the cooling water allowed to flow in an inflow port 19 is introduced in a coolant passage 8 from a flow opening 7 to reach a space 12. The residual cooling water allowed to flow in an inflow opening 19 is allowed to flow in a coolant climb passage part 2 through a coolant climb passage part inlet 4 to be discharged in the passage 8 from a drop passage discharge opening 5 through a reversion part 15 and a coolant drop passage part 3 further. The cooling water discharged from the discharge opening 5 becomes liquid or gas in accordance with the flow amount of the cooling water allowed to flow in the passage 8 from a passage opening 7.

10. 发明专利

JPH0158478B2 失效
公开(公告)号：JPH0158478B2
公开(公告)日：1989-12-12
申请号：JP9440882
申请日：1982-06-02
申请人： HITACHI LTD
发明人： KASHIWAI SHINICHI , UTAMURA MOTOAKI , YOKOYAMA IWAO , NAKAO SHUNJI , KOIZUMI MAKOTO , MASUHARA YASUHIRO , MAEDA JUICHIRO
IPC分类号： G21C9/004 , G21C9/00

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