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21. 发明专利

JPH08136688A REACTOR CORE PERFORMANCE MONITORING SYSTEM 失效
公开(公告)号：JPH08136688A
公开(公告)日：1996-05-31
申请号：JP27472094
申请日：1994-11-09
申请人： HITACHI LTD
发明人： KANAZAWA TORU , NISHIDA KOJI , ORII AKIHITO , CHAGI MASAO
IPC分类号： G21C17/00 , G21C17/06 , G21D3/04
摘要： PURPOSE: To evaluate the effect of abnormal transient on fuel integrity. CONSTITUTION: MCPR and MLHGR calculation program in a reactor core performance monitoring system is activated simultaneously to the occurrence of an abnormal transient. To enable the calculation program to calculate MCPR and MLHGR in real time as far as possible or just after recovering normal operation even in impossible case, a memory device for storing core state data and LPRM data is provided. For the MCPR calculation, an analytical code capable of calculating the coolant flow after boiling transition is used.

22. 发明专利

JPH0894787A BOILING WATER REACTOR 失效
公开(公告)号：JPH0894787A
公开(公告)日：1996-04-12
申请号：JP23295594
申请日：1994-09-28
申请人： HITACHI LTD
发明人： KASHIWAI SHINICHI , KAWASAKI TERUFUMI , ORII AKIHITO , NISHIDA KOJI , NAGAYOSHI HIROYUKI , KANAZAWA TORU , CHAGI MASAO
IPC分类号： G21C15/25
摘要： PURPOSE: To facilitate maintenance and inspection of a coolant recirculation pump and thereby facilitate the maintenance and inspection of the boiling water reactor. CONSTITUTION: Fuel assembly 3 arranged in a reactor pressure vessel and the bottom flow path 16 of coolant formed at the bottom of the reactor pressure vessel are connected with a coolant guide tube 12 and coolant is supplied and recirculated to the fuel assembly with a circulation pump 11 by way of the bottom flow path and the coolant guide tube. To the coolant guide tube 12, a jet pump 25 having a drive force of the exhaust pressure of the circulation pump 11.

23. 发明专利

JPH0481692A FUEL SPACER 失效
公开(公告)号：JPH0481692A
公开(公告)日：1992-03-16
申请号：JP19491090
申请日：1990-07-25
申请人： HITACHI LTD
发明人： NISHIDA KOJI , YOKOMIZO OSAMU , KANAZAWA TORU , KASHIWAI SHINICHI , ORII AKIHITO
IPC分类号： G21C3/344
摘要： PURPOSE:To increase thermal margin by providing a fuel supporting spring with vane which gives revoluting flow to coolant flow which flows between adjoining round cells. CONSTITUTION:At a side surface of a round cell 1, a spring 2 with a vane is provided. In this constitution, a revoluting flow having vertical component to flow direction is generated by the vane 3 at flow path between adjoining round cells, and therewith dew drops accompanied by steam are sticked to liquid membrane flow flowing along fuel rods at downstream down from a spacer and increment of thermal margin can be realized. The fuel rods are supported by the spring 2 with vane, and fixed protrusions 4.

24. 发明专利

JPH01101069A VIDEO CAMERA 失效
公开(公告)号：JPH01101069A
公开(公告)日：1989-04-19
申请号：JP25717287
申请日：1987-10-14
申请人： HITACHI LTD
发明人： KANAZAWA TORU
IPC分类号： G11B33/06 , H04N5/225
摘要： PURPOSE:To facilitate the viewing of the display of recorded pictures by mount ing a color EVF (electronic view finder) and displaying the image on the EVF as a color picture in the recording temporary stop mode of the VTR side and displaying it as a monochromatic picture in the recording mode of the VTR side. CONSTITUTION:A color killer circuit 5 detects a burst, and the output goes to the high level when a color signal is discriminated. If a switching signal 8 is in the high level at this time, a video signal 1 is processed in a succeeding stage circuit and is reproduced as a color picture on the screen of the EVF. If the switching signal 8 is in the low level, the signal 1 is reproduced as a monochromatic picture on the screen of the EVF. The switching signal 8 is set to the low level for the recording temporary stop mode in the VTR side and is set to the high level for the recording mode in the VTR side. The mono chromatic picture is displayed on the screen of the EVF when the VTR side is set to the recording temporary stop mode, and the color picture is displayed there when it is set to the recording mode; and thus, a user only sees the picture on the screen of the EVF to find the mode of the VTR side.

25. 发明专利

JPH11164189A IMAGE RECORDING DEVICE 失效
公开(公告)号：JPH11164189A
公开(公告)日：1999-06-18
申请号：JP32615897
申请日：1997-11-27
申请人： HITACHI LTD
发明人： KANAZAWA TORU
IPC分类号： H04N5/225 , H04N5/232 , H04N5/91
摘要： PROBLEM TO BE SOLVED: To obtain a still picture with less influenced of a hand trembling at any shutter opportunity by successively taking pictures for single photography and recording video data having a smallest hand trembling detected among pieces of obtained video data. SOLUTION: The device is equipped with an angular velocity sensor 90 so as to detect hand trembling. A microprocessor 100 detects the magnitude of output variations of the angular velocity sensor 90 in the opening/closing period of a shutter 40 and stores the output variation as a trembling in itself. Further, the microprocessor 100 performs photographing successively three times. Then the microprocessor 10 compares three tremblings and records the image data corresponding to the smallest on a recording medium 80. Namely, this device obtains three still pictures through three-time photographing when a video- recording button 110 is once pressed and records the still picture having a smallest influence of a hand trembling among those still pictures on the recording medium 80.

26. 发明专利

JPH09145874A FUEL ASSEMBLY, CHANNEL BOX FOR FUEL ASSEMBLY AND FUEL SPACER FOR FUEL ASSEMBLY, AND MANUFACTURE OF CHANNEL BOX 失效
公开(公告)号：JPH09145874A
公开(公告)日：1997-06-06
申请号：JP31042795
申请日：1995-11-29
申请人： HITACHI LTD
发明人： CHAGI MASAO , KANAZAWA TORU , ORII AKIHITO , NAGAYOSHI HIROYUKI , NISHIDA KOJI , KAWASAKI TERUFUMI
IPC分类号： G21C3/324 , G21C3/328 , G21C21/00
摘要： PROBLEM TO BE SOLVED: To provide a fuel assembly, a channel box therefor and a method of manufacturing the channel box for the fuel assembly forming a reactor core suitable for the effective use of fuel with uranium and plutonium mixed as well as improving neutron economy through the increase of freedom of space distribution in the reactor core of speed reducing material and making effective use of reactor core fuel so as to improve economy. SOLUTION: A fuel assembly is provided with a plurality of fuel rods 4 held to a tie plate, and a channel box 7 surrounding a plurality of fuel rods 4. Partial fuel rods 4 arranged near at least one side wall corner part or a side wall edge part of the channel box 7 are removed, and recessed parts are formed at the side wall of the channel box 7 where the fuel rods 4 are removed.

27. 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.

28. 发明专利

JPH07333371A FUEL ASSEMBLY 失效
公开(公告)号：JPH07333371A
公开(公告)日：1995-12-22
申请号：JP13008494
申请日：1994-06-13
申请人： HITACHI LTD
发明人： NISHIDA KOJI , KANAZAWA TORU
IPC分类号： G21C3/28 , G21C3/328
摘要： PURPOSE:To enhance the thermal margin without increasing the pressure drop by disposing the gas plenum of fuel rod at the lower end of a spacer. CONSTITUTION:A fuel rod 1 is held, at the upper and lower ends thereof, by upper and lower tie plates 4, 3 while keeping an interval through a spacer member 8. A gas plenum 5 is disposed at the lower end of a plurality of members 8 arranged axially while sustaining the space thereof by means of a spring 6 and a tubular unheatable member 7 is disposed thereunder. Small holes are made through the upper and lower surfaces of the member 7 so that the member 7 also serves as a gas plenum. Consequently, pressure drop can be decreased. The liquid film becomes thinner through evaporation as the distance from the lower end of a heating member increases and becomes thinnest immediately before the member 8. When the member 7 is provided, the liquid film is protected against evaporation and a required film thickness can be ensured. This structure can ensure the flow rate of liquid film using a most stringent member 8 without increasing the pressure drop thus increasing the thermal margin.

29. 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.

30. 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.

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