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11. 发明公开

EP0282600A4 FUEL ASSEMBLY AND REACTOR. 失效
标题翻译：燃料棒束与核。
公开(公告)号：EP0282600A4
公开(公告)日：1989-01-17
申请号：EP87905801
申请日：1987-09-14
申请人： HITACHI LTD
发明人： YOKOMIZO OSAMU , YOSHIMOTO YUICHIRO , KATAOKA YOSHIYUKI , KASHIWAI SHINICHI , MASUHARA YASUHIRO , TOMIYAMA AKIO , ORII AKIHITO , INOUE KOTARO - MURAMATSU , MOCHIDA TAKAAKI , HAYASHI TATSUO
IPC分类号： G21C3/30 , G21C3/32 , G21C3/322 , G21C3/326 , G21C3/328 , G21C7/22 , G21C7/27 , G21C7/32
CPC分类号： G21C3/322 , G21C2003/3225 , G21Y2002/201 , G21Y2004/30 , Y02E30/38

12. 发明专利

JPH1048374A FUEL ASSEMBLY 失效
公开(公告)号：JPH1048374A
公开(公告)日：1998-02-20
申请号：JP20684196
申请日：1996-08-06
申请人： HITACHI LTD
发明人： CHAGI MASAO , NISHIDA KOJI , KARASAWA HIDETOSHI , KANAZAWA TORU , ORII AKIHITO , NAGAYOSHI TAKUSHI , KASHIWAI SHINICHI , MASUHARA YASUHIRO
IPC分类号： G21C3/328 , G21C3/326
摘要： PROBLEM TO BE SOLVED: To provide a fuel assembly capable of improving fuel economy by increasing duel inventory even with using short fuel rods. SOLUTION: A fuel assembly 1 is provided with fuel rods 2 arranged in 9×9 matrix and 8 short fuel rids 9,0,The inner width of the channel box 7 is approximately 132.5mm and the length of the fuel rods is approximately 4.1m. Provided that the duel inventory in the short fuel rods 9 is X (kg), and the duel inventory in the other fuel rods is Y (kg), and X and Y fulfills the relations, X+Y>=173, Y =0.

13. 发明专利

JPH05189500A DESIGN SUPPORTING DEVICE 失效
公开(公告)号：JPH05189500A
公开(公告)日：1993-07-30
申请号：JP614992
申请日：1992-01-17
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： FUKAHORI TAKANORI , BESSHO TAISUKE , YOSHIMOTO YUICHIRO , SUGAWARA SHIGERU , KOBATA TOSHIHIRO , TAKAGI HIROAKI , AKIYAMA MASANORI , MASUHARA YASUHIRO
IPC分类号： G21C5/00 , G06F17/50 , G21C17/00
摘要： PURPOSE:To shorten the design time by rapidly changing the design data to be reflected on the design without missing the restriction of the limit value while displaying the design data and the design reference value on the same screen. CONSTITUTION:The system is provided with a display device 2, picture display controller 3, picture data storage section 4, arithmetic processor 5, control panel 6, storage devices 7 and 8, and host computer 9. The storage device 7 stores the design reference data. The storage device 8 stores the design data. Drawing display configuration selection signals is inputted from the control panel 6 to calculate and display, for example, the radial output distribution being the core design, the output distribution in the core average axis direction, the output distribution of the area average axis direction, the area average flow amount, the time change of the area average neutron flux, and the reduction ratio of the vibration. The core design limit value being the core design reference data is displayed on the same screen.

14. 发明专利

JPH04122890A NATURAL CIRCULATION TYPE NUCLEAR REACTOR 失效
公开(公告)号：JPH04122890A
公开(公告)日：1992-04-23
申请号：JP24237290
申请日：1990-09-14
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , TOMINAGA KENJI
IPC分类号： G21C5/00 , G21C5/12 , G21C7/30
摘要： PURPOSE:To achieve even higher fuel economy by a method wherein a fuel assembly early in the life of fuel is burned at a high output in a Pu production area and the fuel assembly after producing Pu is rearranged to a Pu burning area in the midterm of the life to burn at a low output. CONSTITUTION:The center of a nuclear reactor core 1 is set up as plutonium production area 6 while the peripheral part thereof as plutonium burning area 7. A fuel assembly early in the life of fuel is arranged in the plutonium production area at the center of the reactor core and burned at a high output. On the other hand, when the life of the fuel of the assembly reaches a mid term, the assembly is rearranged to the peripheral burning area and burned at a low output. With such an arrangement, when the operation as mentioned above is performed, plutonium can be produced at the center of the reactor core and the plutonium produced burned at the peripheral part thereby improving the fuel economy by a burned portion of the plutonium.

15. 发明专利

JPH0347479B2 失效
公开(公告)号：JPH0347479B2
公开(公告)日：1991-07-19
申请号：JP15566682
申请日：1982-09-07
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , UTAMURA MOTOAKI , KASHIWAI SHINICHI , YOKOYAMA IWAO , MURATA SHIGETO , NAKAO SHUNJI , MAEDA JUICHIRO
IPC分类号： G21C15/02 , F04D29/44 , G21C1/08 , G21C9/00 , G21C13/10 , G21C15/18 , G21C19/307

16. 发明专利

JPH0357998A SPECTRAL SHIFT OPERATION OF BOILING WATER REACTOR AND CONTROLLING APPARATUS THEREFOR 失效
公开(公告)号：JPH0357998A
公开(公告)日：1991-03-13
申请号：JP19262689
申请日：1989-07-27
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , YOKOMIZO OSAMU , NISHIDA KOJI , KASHIWAI SHINICHI , MURATA SHIGETO , NAKAO SHUNJI , ORII AKIHITO , KAWASAKI TERUFUMI , AOYAMA TADAO , YAMASHITA JUNICHI
IPC分类号： G21C7/27
摘要： PURPOSE:To make it possible to avoid a rise in output of a reactor by making a control so as not to lower the liquid level of a coolant in a water rod below a specified level during a spectral shift SS operation. CONSTITUTION:A control of a core output is executed at the height of a liquid level 30 of a coolant during an SS operation, and therefore the output control by a control rod 4 is unnecessary. However, when a pressure inside a core rises due to interruption of a load, for instance, a pressure difference occurs between the inside of the core and that of a water rod 16, cooling water is thereby made to flow into the water rod 16 to cause a rise in the liquid level 30, an apparent void rate in the upper part of a fuel assembly decreases rapidly, a reaction proceeds to a large extent, and the output increases. On the occasion, the tendency of the rise in a liquid surface is weak as the initial level 30 is high, and the tendency of the rise decreases contrariwise when the initial level is as high as about 3 m or above, that is, about 0.76 times as high as the full length of the water rod 16. By limiting the level 30 to be within this range of condition by controlling a circulation pump, and by conducting a normal operation in this state, accordingly, the rise in the level due to the interruption of the load or the like can be suppressed and thus a sharp rise in the output can be avoided.

17. 发明专利

JPH021590A OPERATION OF NUCLEAR REACTOR AND FUEL AGGREGATE 失效
公开(公告)号：JPH021590A
公开(公告)日：1990-01-05
申请号：JP1699188
申请日：1988-01-29
申请人： HITACHI LTD
发明人： NISHIDA KOJI , YOKOMIZO OSAMU , MASUHARA YASUHIRO , NAKAO SHUNJI , KASHIWAI SHINICHI , TOMIYAMA AKIO , YAMASHITA JUNICHI , HAYASHI TATSUO
IPC分类号： G21C3/32 , G21C7/00 , G21C7/26 , G21C7/27
摘要： PURPOSE:To decrease the number of times of replacement of a control rod and to decrease the number of pieces of control rods to be rejected by increasing the variation width of an average void coefficient by adjusting a liquid level of a coolant in a void coefficient adjusting means having a coolant ascending passage and a coolant descending passage. CONSTITUTION:By an ascent of a cooling water level L1 in a water rod 61, a void coefficient in the water rod 61 can be varied remarkably. Therefore, it is unnecessary to execute a control rod drawing-out operation, and by adjusting the liquid level L1 of cooling water in the water rod 61, an output of a nuclear reactor can be held constant extending from a point C to a point D. In a point D, the inside of the water rod 61 becomes completely a state of water as shown by (c) on the right side. At the time of stop just before a fuel cycle period is ended, a control rod 17 is inserted, and operation of the nuclear reactor is stopped.

18. 发明专利

JPH021587A FUEL AGGREGATE AND NUCLEAR REACTOR 失效
公开(公告)号：JPH021587A
公开(公告)日：1990-01-05
申请号：JP24414588
申请日：1988-09-30
申请人： HITACHI LTD
发明人： IKEMURA KAZUYUKI , YOKOMIZO OSAMU , YOSHIMOTO YUICHIRO , HAYASHI TATSUO , KASHIWAI SHINICHI , MASUHARA YASUHIRO , SAKURAI MIKIO , TOMIYAMA AKIO , FUJII TADASHI , SUMIDA ISAO
IPC分类号： G21C3/322 , G21C3/30 , G21C3/33 , G21C15/02
摘要： PURPOSE:To prevent the flow of a coolant from becoming unstable without using a movable part by increasing continuously a passage cross sectional area of a coolant passage of a resistance device toward the upstream and the downstream sides, respectively from a throat part, and also, forming the side wall to a continuous plane being free from a corner part. CONSTITUTION:A fuel aggregate 45 consists of a channel box 56, the lower tie plate 38, the upper tie plate 46, a spacer 54, a fuel rod 47 and an orifice 25. The upper and the lower end parts of the fuel rod 47 are held by the lower tie plate 38 and the upper tie plate 46. The orifice 25 is a resistance device, and between each adjacent round bar 27, a gap 28 which becomes a cooling water passage is formed. As for the gap 28, its cross sectional area increases gradually toward the upstream side and the downstream side from a throat part 8A, and the gap is delimited by a pair of side walls constituted of a continuous plane being free from a corner part.

19. 发明专利

JPH01176982A WATER ROD AND FUEL ASSEMBLY 失效
公开(公告)号：JPH01176982A
公开(公告)日：1989-07-13
申请号：JP36988
申请日：1988-01-06
申请人： HITACHI LTD
发明人： NAKAO SHUNJI , YOKOMIZO OSAMU , MASUHARA YASUHIRO , KASHIWAI SHINICHI , TOMIYAMA AKIO , NISHIDA KOJI , YAMASHITA JUNICHI
IPC分类号： G21C3/326 , G21C3/32
摘要： PURPOSE:To easily and stably control the void rates in a reactor core by a change in the flow rate within the core by providing a coolant rising flow passage having an inflow port in the position lower than a resistor and a coolant descending flow passage having a discharge port in the position upper than the resistor. CONSTITUTION:This fuel rods consists of a riser 21, a downcomer 31, a branch fitting 11, upper, lower caps 15, 16, etc. A hole 12 having a bottom in the central part is provided to the fitting 11 and holes 13 to discharge the cooling water to 4 ways from the bottom of the hole 12 are provided. The upper part of the hole 12 is butt-welded to the downcomer 31. The riser 21 is welded to the top of the outside circumferential part of the fitting 11 and the cap 16 to the bottom of said part. A hole 14 is penetrated in the fitting 11 so as to avert the hole 13. The cooling water enters the inflow port 4, rises in the flow passage 2 by passing the hole 14 and enters the flow passage 3 from a communicating port 10 provided to the upper part of the downcomer 31 in which the cooling water flows downward until the water is discharged from the holes 12, 13. The downcomer 31 is formed of a niobium alloy or 347 stainless steel. The change in the void rates with respect to an increase in the differential pressure between the inlet and the outlet is more monotonous as the bore of the downcomer 31 is smaller. The void rates are thus equivocally determined with respect to the differential pressure between the inlet and the outlet.

20. 发明专利

JPS646892A CORE INTERNAL STRUCTURE OF NUCLEAR REACTOR 失效
公开(公告)号：JPS646892A
公开(公告)日：1989-01-11
申请号：JP16267687
申请日：1987-06-30
申请人： HITACHI LTD
发明人： MASUHARA YASUHIRO , YOKOMIZO OSAMU , MOCHIDA TAKAAKI , KASHIWAI SHINICHI , TOMIYAMA AKIO , NAKAO SHUNJI
IPC分类号： G21C3/326 , G21C3/32 , G21C7/28
摘要： PURPOSE:To increase burnup and to improve fuel economy by decreasing a difference in reactivity during the operation and shut-down of a nuclear reactor and increasing the reactivity during the operation. CONSTITUTION:The top end of a neutron moderating pipe 6 filled internally with an inert gas is closed and a communicating hole 4 for opening the bottom part is provided thereto. An internal piping 7 running through the top end and bottom end of the neutron moderating pipe is provided and a moderator is passed in this piping 7. Fins 8 for steam condensation are provided in the upper part. Double pipes or an internal pipe provided with a spray part in the upper part which is not the through-piping 7 is equally satisfactory. The inert gas is thereby compressed by cooling water and the neutron is moderated over the entire length of the fuel rod during the normal operation. The average density in the pipe is decreased during the shut-down of the reactor. The difference in the reactivity during the shut-down and the operation is thereby eliminated and, therefore, the uranium to water ratio during the operation is increased and the reactivity during the operation is improved; in addition, there are no moving parts and, therefore, the reliability is enhanced.

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