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1. 发明专利

JPH10206585A BOILING WATER REACTOR CORE AND FUEL ASSEMBLY WITH DETERMINED DIMENSION SO AS TO BE LOADED IN THE CORE 失效
公开(公告)号：JPH10206585A
公开(公告)日：1998-08-07
申请号：JP1132797
申请日：1997-01-24
申请人： HITACHI LTD
发明人： NAGAYOSHI TAKUJI , CHAGI MASAO , NISHIDA KOJI , TAKII TAICHI
IPC分类号： G21C5/00 , G21C3/30
摘要： PROBLEM TO BE SOLVED: To provide a core with higher neutron economy and superior to current one in a boiling water reactor having nearly cylindrical core with arrangement of C grid, D grid or K grid and a fuel assembly with dimensions determined so as be loaded in this core. SOLUTION: When the total area inside a fuel grid constituting a core is A, the total length of sides not shared by the 2 neighboring fuel grids 1 in the fuel grid 1 constituting the core is P, the diameter of horizontal cross section in cylindrical region capable of arranging in parallel fuel assemblies determined by the structure of the reactor or material characteristic and usable for core is P, the length of the fuel grid 1 is selected to be smaller than 5.383 as the value of an ABWR type reactor of 1350MW electric power class.

2. 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.

3. 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.

4. 发明专利

JP2014163806A Fuel assembly 审中-公开
标题翻译：燃油总成
公开(公告)号：JP2014163806A
公开(公告)日：2014-09-08
申请号：JP2013035284
申请日：2013-02-26
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KATONO KENICHI , MITSUYASU TAKESHI , NAGAYOSHI TAKUJI , AOYAMA MOTOO
IPC分类号： G21C3/33 , G21C3/328 , G21C3/34
CPC分类号： G21C3/322 , G21C3/3305 , G21C3/34 , G21C2003/3432 , Y02E30/38
摘要： PROBLEM TO BE SOLVED: To eliminate a risk of reducing a heat removing performance of a central fuel rod in a fuel assembly lower region when improving a thermal margin of an utmost outer peripheral fuel rod.SOLUTION: A flow rate of coolant can be increased in a cross-sectional central part of the fuel assembly by making a passage hole area of a bottom tie plate larger in a central part than in an outer side of the bottom tie plate, thereby a heat removing performance of a central fuel rod is maintained immediately after the bottom tie plate. Since the coolant easily flows to an outer periphery part rather than to a central part in a cross-section as the coolant rises inside the fuel assembly by a fuel rod arrangement in which an outer peripheral fuel rod arrangement pitch is enlarged larger than the central part, a thermal margin of an utmost outer peripheral fuel rod can be improved in a fuel assembly upper part region.
摘要翻译：要解决的问题：为了消除在改善最外周燃料棒的热裕度时降低燃料组件下部区域中的中央燃料棒的除热性能的风险。解决方案：可以增加冷却剂的流量燃料组件的横截面中心部分，通过使底部连接板的通道孔区域在中间部分比底部连接板的外侧更大，从而立即保持中央燃料棒的散热性能后底板。由于当冷却剂通过燃料棒装置在燃料组件内部升高时，冷却剂容易地流到外周部而不是中间部分，其中外周燃料棒排列间距扩大到大于中心部分可以在燃料组件上部区域中改善最大外周燃料棒的热裕度。

5. 发明专利

JPH08320392A SPECTRAL SHIFT ROD AND BOILING WATER REACTOR 失效
公开(公告)号：JPH08320392A
公开(公告)日：1996-12-03
申请号：JP12645895
申请日：1995-05-25
申请人： HITACHI LTD
发明人： KASHIWAI SHINICHI , ORII AKIHITO , KAWASAKI TERUFUMI , NISHIDA KOJI , KANAZAWA TORU , NAGAYOSHI TAKUJI
IPC分类号： G21C7/27
摘要： PURPOSE: To provide a boiling water reactor for improving the stability of a reactor core without increasing any pressure loss thereof when the reactor is started or stopped in the case of low output. CONSTITUTION: A spectral shift rod 25 is composed of a big riser flow passage 23 and a down comer flow passage 24, the inlet of the riser flow passage 23 is opened in the flow passage formed under the lower tie plate 10 of a fuel assembly, and the outlet of the upper part of the riser flow passage 23 communicates with the inlet of the down comer flow passage 24 whose outlet is the spectral shift rod 25 formed on the lower tie plate 10. The height (h) of the lower face of the lower tie plate 10 to the outlet of the down comer flow passage 24 is in the neighborhood of the intermediate of the total length of the spectral shift rod 25, the riser flow passage 23 is fully filled with water at the time of rating output operation, and the water level of the inside of the riser flow passage 23 is lowered in response to the decrease of a quantity of coolant flow in the operation at less than the rating output.

6. 发明专利

JP2002266800A PUMP DRAINAGE USING SIPHON CHANNEL 失效
公开(公告)号：JP2002266800A
公开(公告)日：2002-09-18
申请号：JP2001062398
申请日：2001-03-06
申请人： HITACHI LTD
发明人： NAGAYOSHI TAKUJI , MINATO AKIHIKO , NISHIDA KOJI , TAKAMORI KAZUHIDE
IPC分类号： F04F10/00
摘要： PROBLEM TO BE SOLVED: To provide a pump drainage using a siphon channel with a rectangular cross section capable of attaining a prescribed drain flow rate in a short time without causing a sharp increase in construction cost. SOLUTION: An air volume to be discharged by a water flow is reduced as a form of changing the distance between a channel upper wall and lower wall in a cross section vertical to the main stream direction to a water flow quantity distribution in the channel, at least, in a part of a range in the flow direction of the siphon channel with the rectangular cross section.

7. 发明专利

JPH07225291A SPACER FOR NUCLEAR REACTOR FUEL ASSEMBLY AND THE SAME ASSEMBLY 失效
公开(公告)号：JPH07225291A
公开(公告)日：1995-08-22
申请号：JP1735094
申请日：1994-02-14
申请人： HITACHI LTD
发明人： KAWASAKI TERUFUMI , NISHIDA KOJI , NAGAYOSHI TAKUJI , HIDAKA MASATAKA , KASHIWAI SHINICHI , ORII AKIHITO
IPC分类号： G21C3/344
摘要： PURPOSE:To provide a spacer for a nuclear reactor fuel assembly and the assembly in which a critical power is improved without increasing a pressure loss by preventing scattering of a liquid film on a surface of a fuel rod, expediting adherence of a fuel rod of liquid droplet from a surface liquid film of a cell and increasing a thickness of the film on the surface of the rod. CONSTITUTION:A round cell 11 is provided with substantially triangular cutouts 3, formed with sixteen protrusions 1B in a circumferential direction, and a downstream side end face is formed in a waveform shape. The relationship of H>=piXD/N exists among an outer diameter D of the cell 1, the depth H of the cutouts 3 and number N of the protrusions 1B. Thus, a liquid film moving from below to above on a surface of the cell 11 undergoes fission to right and left at a bottom of the cutouts 3, and is collected to the protrusions 1B. When the film flies out from the cell 11 into gas to be shrunk to become liquid yarns, more films spring out from the protrusions 1B, and hence many fine liquid yarns are generated to expedite fine granulation of the liquid droplets. Accordingly, a quantity of the droplets adhered to the surface of a fuel rod 2 from the surface of the cell 1 is increased, and a thickness of the film on the surface of the rod 2 can be increased.

8. 发明专利

JP2014126516A Fuel assembly 有权
标题翻译：燃油总成
公开(公告)号：JP2014126516A
公开(公告)日：2014-07-07
申请号：JP2012285092
申请日：2012-12-27
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MITSUYASU TAKESHI , AOYAMA MOTOO , NAGAYOSHI TAKUJI , KATONO KENICHI
IPC分类号： G21C3/34 , G21C3/322 , G21C3/326
CPC分类号： G21C3/32 , G21C3/04 , G21C3/322 , G21C3/344 , G21C3/356 , G21C2003/3265 , Y02E30/38
摘要： PROBLEM TO BE SOLVED: To provide a fuel assembly of which the thermal margin of a fuel rod located in the outermost layer of fuel rod array can be improved even when a fissile material loading amount of the fuel rod located in the outermost layer of fuel rod array is increased.SOLUTION: In a fuel assembly, a plurality of fuel rods containing a fissile material are bundled by a fuel spacer. The fuel rods are arranged in 10 lines and 10 columns surrounding two large-diameter water rods arranged at a center part of a cross section of the fuel assembly. Flow resistors 15 are arranged at the center part of the cross section at upper ends of partial long fuel rods which are a part of the fuel rods. The flow resistors 15 are arranged, respectively, among mutual round cells 9 formed by arranging resistance members 16 in six lines and six columns in diagonal directions of the flow resistors 15. Resistance members 17 are arranged among the round cells 9 at the periphery of the flow resistors 15. By installation of the resistance members 16, 17, pressure loss of an internal region on the cross section of the fuel assembly increases, and a flow rate of gas-liquid two-phase flow in an external region surrounding the internal region increases.
摘要翻译：要解决的问题：提供一种燃料组件，即使在位于燃料棒的最外层中的燃料棒的易裂变材料装载量也能够提高燃料棒的位于燃料棒阵列的最外层中的燃料棒的热量余量阵列增加。解决方案：在燃料组件中，包含易裂变材料的多个燃料棒由燃料间隔件捆扎。燃料棒布置在布置在燃料组件的横截面的中心部分处的两个大直径水棒的10根线和10列中。流量电阻器15布置在作为燃料棒的一部分的部分长燃料棒的上端处的横截面的中心部分处。流动电阻器15分别布置在通过在流动电阻器15的对角线方向上排列六列六列电阻构件16而形成的相互圆形电池9中。电阻构件17布置在圆形电池9的外围通过安装电阻构件16,17，燃料组件的横截面上的内部区域的压力损失增加，并且在内部区域周围的外部区域中气液两相流的流量增加。

9. 发明专利

JP2002276600A METHOD OF EVALUATING SHAPE OF SYPHON CONDUIT AND PUMP DRAINAGE EQUIPMENT 失效
公开(公告)号：JP2002276600A
公开(公告)日：2002-09-25
申请号：JP2001075243
申请日：2001-03-16
申请人： HITACHI LTD
发明人： INOUE YASUHIRO , MINATO AKIHIKO , NAGAYOSHI TAKUJI , HARADA ICHIRO , MASE MASAHIRO , TANAKA HIROSHI
IPC分类号： F04F10/00
摘要： PROBLEM TO BE SOLVED: To accurately estimate good or bad of the shape of a syphon and the syphon forming time in a short time. SOLUTION: A transit, phenomenon for extruding a part of the air inside of a syphon conduit 2 like a piston from the beginning of the operation of a pump to the ordinary bubble engulfing condition is performed on the basis of the double-phase analysis. In a process of a rise of the double-phase water level for a long time from the formation of an air pocket to the formation of a pressure syphon, an estimation formula (empirical formula) utilizing analogy of the amount of entrained air is used to evaluate the shape of the syphon pipeline.

10. 发明专利

JPH09281264A FUEL SPACER AND FUEL ASSEMBLY OF BOILING WATER TYPE NUCLEAR REACTOR 失效
公开(公告)号：JPH09281264A
公开(公告)日：1997-10-31
申请号：JP9505296
申请日：1996-04-17
申请人： HITACHI LTD
发明人： NAGAYOSHI TAKUJI , NISHIDA KOJI , KANAZAWA TORU
IPC分类号： G21C3/344
摘要： PROBLEM TO BE SOLVED: To improve the thermal allowance of a fuel assembly. SOLUTION: The outside diameter of round cell members 1 in which fuel rods 33 are passed and supported is smaller than the distances between the centers of the fuel rods 33. The side walls thereof include only the apertures 4 limited to be necessary for forming stoppers 11 which are means for supporting the fuel rods 33 and supporting and passing springs 13. The thickness of the round cells 1 is the value of the smallest possible extent at which the strength necessary for holding the spacings between the fuel rods 33 determined by the characteristics of the materials is assured after the necessary reliability is assured. Further, the flow passages having the area to allow the passage of the steam entraining the liquid films and liquid drops on the surfaces of the fuel rods 33 exclusive of the closure of part by the stoppers 11 and the springs 13 are assured between the inside walls of the round cells 1 and the outside walls of the fuel rods 33.

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