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1. 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.

2. 发明专利

JPS63277994A SPACER FOR NUCLEAR FUEL ASSEMBLY 失效
公开(公告)号：JPS63277994A
公开(公告)日：1988-11-15
申请号：JP8292387
申请日：1987-04-06
申请人： HITACHI LTD
发明人： TOMIYAMA AKIO , MASUHARA YASUHIRO , KASHIWAI SHINICHI , NAKAO SHUNJI , YOKOMIZO OSAMU
IPC分类号： G21C3/344 , G21C3/34
摘要： PURPOSE:To lower a pressure loss coefft. without deteriorating the strength of a spacer so that the driving power of a pump is reduced and flow stability is improved by forming annular elements to complete cylinders closed at the circumferential faces. CONSTITUTION:The spacer is formed by concentrically arranging the annular elements 1 and reinforcing the elements with an outer ring 2. The respective annular elements 1 are formed to the complete cylinders having no holes on the circumferential faces. The formation of the ends of the annular element 1 to an acute angled or streamlined shape is equally satisfactory. Notches and holes are not provided even in the case of providing projecting parts (dimples) to support fuel to the annular elements 1. The pressure loss coefft. of the spacer is thereby lowered without deteriorating the strength of the spacer and, therefore, the driving power of the pump is reduced and the flow stability is improved.

3. 发明专利

JPS6342495A NUCLEAR FUEL SPACER 失效
公开(公告)号：JPS6342495A
公开(公告)日：1988-02-23
申请号：JP18512586
申请日：1986-08-08
申请人： HITACHI LTD
发明人： TOMIYAMA AKIO , YOKOMIZO OSAMU , MASUHARA YASUHIRO , KASHIWAI SHINICHI
IPC分类号： G21C3/34

4. 发明专利

JPH0277689A FUEL ASSEMBLY 失效
公开(公告)号：JPH0277689A
公开(公告)日：1990-03-16
申请号：JP18561988
申请日：1988-07-27
申请人： HITACHI LTD
发明人： TOMIYAMA AKIO , YOKOMIZO OSAMU , MASUHARA YASUHIRO , NAKAO SHUNJI , KASHIWAI SHINICHI , MURATA SHIGETO , HIRAKAWA HIROMASA , KAWADA YOSHINARI
IPC分类号： G21C3/10 , G21C3/33
摘要： PURPOSE:To reduce a pressure loss by providing a cover means on the one hand of fuel rods and an upper tie plate to provide the fuel assembly with the cover means which surrounds at least one part of the axial circumference of a coil spring. CONSTITUTION:An upper end plug 4 of a fuel rod 2 is held by an upper tie plate 1 and a lower end plug 4A thereof is kept by a lower tie plate 11. A coil spring 2C pushing fuel pellets 2B is arranged in a gas plenum. An expansion spring 5 is attached to an end plug 4 and a cap 13 is mounted on the end plug 4. The spring 5 is in the cap 13 and its circumference is surrounded by the cover part of the cap 13. The upper end of the spring 5 comes in contact with a holding part and the cap 13 is pushed on a boss of a tie plate 1A. The inner diameter of the cover part is a little larger than the outer diameter of the fuel rod 2 so as to permit radial expansion.

5. 发明专利

JPS63290995A BOILING WATER REACTOR 失效
公开(公告)号：JPS63290995A
公开(公告)日：1988-11-28
申请号：JP12588487
申请日：1987-05-25
申请人： HITACHI LTD
发明人： NAKAO SHUNJI , YOKOMIZO OSAMU , TOMIYAMA AKIO , KASHIWAI SHINICHI , MASUHARA YASUHIRO , KOIZUMI MAKOTO , YOSHIMOTO YUICHIRO
IPC分类号： G21C17/032 , G21C17/02
摘要： PURPOSE:To decrease the error of a height with an average flow velocity by measuring the flow velocities at the height at which the flow velocity distribution in a down comer section is small both at the time of a rated operation of a boiling water reactor and at the time of a partial operation of an internal pump. CONSTITUTION:Flow velocity detectors 1 are provided at the height between the height in the central part of a reactor core 5 and the bottom end thereof in the down comer section 2 enclosed by a shroud 3 and a pressure vessel 6 to measure the flow velocity V of the coolant flowing down through the down comer section 2 into the reactor core 5. The flow velocity detectors 1 are provided in plural pieces and the average V of the plural measured flow velocity values are computed in a computing element 8. The flow rate of the coolant flowing down in the downcomer 2, i.e., the reactor core flow rate Q is measured by multiplying the average value of the flow velocities and the sectional area A in the position of the down comer 2 where the flow velocities are measured in a multiplier 9. The result thereof is outputted to a flow rate indicator 10.

6. 发明专利

JPS6398591A FUEL AGGREGATE 失效
公开(公告)号：JPS6398591A
公开(公告)日：1988-04-30
申请号：JP24298086
申请日：1986-10-15
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , YOKOMIZO OSAMU , TOMIYAMA AKIO , MURATA SHIGETO , INOUE KOTARO
IPC分类号： G21C3/328 , G21C3/32

7. 发明专利

JPS62221706A MONITOR FOR SYSTEM STABILITY 失效
公开(公告)号：JPS62221706A
公开(公告)日：1987-09-29
申请号：JP6408386
申请日：1986-03-24
申请人： HITACHI LTD
发明人： TOMIYAMA AKIO , YOKOMIZO OSAMU , MASUHARA YASUHIRO , KASHIWAI SHINICHI , NAKAO SHUNJI
IPC分类号： G05B23/02 , G21C17/00
摘要： PURPOSE:To obtain a monitor for stability of an on-line real time operation with high accuracy without using an additional device by setting two points for delay time of a self-correlative function. CONSTITUTION:An input signal 4 is processed with self-correlative function values g1 and g2 of delay times tau0 and 2tau0 through a 2-point self-correlative function arithmetic unit 1 consisting of a delay unit, a multiplier, an integrator and a divider. Then the values g1 and g2 undergo the arithmetic processing through a stable index arithmetic unit 2. Thus a stable index (a) is obtained and displayed on an output display device 3. In such a way, the system stability can be monitored in on-line real time only by the device 1 having delay times tau0 and 2tau0 and without using an average cycle arithmetic unit nor a variable delay device. Thus the device constitution is simplified and furthermore the higher the monitor accuracy the more a system is unstabilized. Then the monitor reliability is improved.

8. 发明专利

JPH01176984A WATER ROD AND FUEL ASSEMBLY 失效
公开(公告)号：JPH01176984A
公开(公告)日：1989-07-13
申请号：JP37988
申请日：1988-01-06
申请人： HITACHI LTD
发明人： KASHIWAI SHINICHI , YOKOMIZO OSAMU , MASUHARA YASUHIRO , NAKAO SHUNJI , TOMIYAMA AKIO , NISHIDA KOJI , YAMASHITA JUNICHI
IPC分类号： G21C3/326 , G21C3/32
摘要： PURPOSE:To easily and stably control and largely change the void rates in a nuclear reactor by a change of the flow rate in the core with a simple construction by working the inside surface of a riser so as to form foaming nuclei. CONSTITUTION:The foaming nuclei are provided on the inside wall of a rising flow passage 2 (outside surface of a downcomer 31) and outside wall (inside surface of the riser 21) of a water rod. Stable continuous boiling is thereby generated and the fluctuation in the liquid level (void) in the water rod is decreased. The temp. of the downcomer 31 upper than a liquid surface is increased as the downcomer is heated by irradiation of neutrons and gamma rays if there is the liquid surface exists in the flow passage 2. On the other hand, the reactor output increases sharply when the core flow rate increases and the void rates drop sharply. The liquid surface touches the metal overheated in a steam section and hinders the abrupt change of the liquid surface (void) when the core flow rate increases sharply and is going to lift the liquid level in the water rod. The heat transfer area is increased as well by the foaming nuclei at this time and, therefore, the effect of hindering the abrupt increase in the reactor output increases as well.

9. 发明专利

JPS6418094A NUCLEAR REACTOR CORE SUBSTRACTURE 失效
公开(公告)号：JPS6418094A
公开(公告)日：1989-01-20
申请号：JP17547787
申请日：1987-07-14
申请人： HITACHI LTD
发明人： KASHIWAI SHINICHI , YOKOMIZO OSAMU , NAKAO SHUNJI , MASUHARA YASUHIRO , TOMIYAMA AKIO
IPC分类号： G21C15/02
摘要： PURPOSE:To reduce cooling water pressure loss of a reactor core inlet part without drastic modification of reactor structure elements and drastic increase of equipment cost by setting dimensions and position of opening, which is a fuel support fitting cooling water passage inlet on the upper part of a control rod guide pipe, in a fixed condition. CONSTITUTION:Vertical direction length of opening 30 which is an inlet of a fuel support fitting cooling water passage 5 of a control rod guide pipe 16 reaches at least up to the lower surface of a core plate 3 from the position at which a fuel support fitting 15 is inscribed on the control rod guide pipe 16 and its width is at least equal to the hole diameter of perforated seat of the fuel support fitting 15. The circumferential position of the fuel rod guide pipe 16 of the opening 30 indicates the position at which the hole of the perforated seat includes the projected position on the pipe wall of the control rod guide pipe 16 from the center side of the fuel support fitting 15. Therefore, the curvature of the fuel support fitting cooling water passage 5 is moderate, pressure loss of the cooling water can be lessened and the reactor core flow can be increased without enlarging pump capacity.

10. 发明专利

JPS6373187A FUEL AGGREGATE AND NUCLEAR REACTOR 失效
公开(公告)号：JPS6373187A
公开(公告)日：1988-04-02
申请号：JP21716586
申请日：1986-09-17
申请人： HITACHI LTD
发明人： YOKOMIZO OSAMU , YOSHIMOTO YUICHIRO , KATAOKA YOSHIYUKI , KASHIWAI SHINICHI , MASUHARA YASUHIRO , TOMIYAMA AKIO , ORII AKIHITO , INOUE KOTARO , MOCHIDA TAKAAKI , HAYASHI TATSUO
IPC分类号： G21C3/30 , G21C3/32 , G21C3/322 , G21C3/326 , G21C3/328 , G21C7/22 , G21C7/27 , G21C7/32

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