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51. 发明专利

JPH1194989A BOILING WATER REACTOR POWER PLANT AND ITS WATER QUALITY CONTROL METHOD 失效
公开(公告)号：JPH1194989A
公开(公告)日：1999-04-09
申请号：JP25651097
申请日：1997-09-22
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA MOTOHIRO , MOCHIZUKI KENTA , UETAKE NAOTO , ISHIDA KAZUNARI
IPC分类号： G21C17/02 , G21D3/08
摘要： PROBLEM TO BE SOLVED: To sufficiently reduce radioactivity concentration in reactor water by controlling iron concentration in feed water to a specific value of nickel concentration and controlling the copper concentration to a specific value of iron concentration. SOLUTION: In order to lower the radioactivity concentration in reactor water, the iron concentration in feed water is controlled to twice the nickel concentration and the copper concentration in the feed water is controlled to 1/1000 or higher of the iron concentration. By electrolyzing iron electrode 27 containing copper in the electrode, suspension solution of concentration ratio (Fe/Cu) of 1000 or lower is made and injected. The concentration of Fe and Cu in the electrolyte tank 26 is set by measuring the Fe and Cu concentration in the feed water, calculating each lacking quantity and controlling electrolyzing current. The mixture solution of Fe and Cu is guided to a concentration controlling tank 26 and injected in the feed water with an injection pump 32 after confirming the concentration. It is operated by sampling system water from a feed water heater outlet sampling line 20 and periodically checking objective concentration of Fe and Cu in the feed water being ensured.

52. 发明专利

JPH1048386A REDUCING METHOD FOR CHROMIUM CONCENTRATION IN SUPPLY WATER SYSTEM 失效
公开(公告)号：JPH1048386A
公开(公告)日：1998-02-20
申请号：JP20806796
申请日：1996-08-07
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA MOTOHIRO , OSUMI KATSUMI
IPC分类号： G21D1/00 , G21D3/08
摘要： PROBLEM TO BE SOLVED: To maintain low chromium amount eluting from supply water heater tube by maintaining the concentration ratio between dissolved oxygen and dissolved hydrogen in supply water lower than a specific value and contribute to safe operation of a plant. SOLUTION: At first, the concentrations of dissolved oxygen and dissolved hydrogen in supply water are measured with dissolved oxygen meter 24 and dissolved hydrogen meter 25, respectively. Based on the measured results, hydrogen gas corresponding to a target concentration of the preset concentration ratio (concentration ratio A) dissolved oxygen/dissolved hydrogen is injected from a hydrogen gas bomb 23 in condenser system. Then, by repeating this operation, the concentration ratio is set at the target value A. Supply water is sampled from a sampling system 20 and chromium concentration in supply water is analyzed to confirm that the concentration is maintained sufficiently low. Since the appropriateness of the target value of concentration ratio A is confirmed thereby and so the chromium amount eluting from the supply water heater tube can be maintained low.

53. 发明专利

JPH09230088A STOP METHOD FOR BOILING WATER NUCLEAR POWER PLANT 失效
公开(公告)号：JPH09230088A
公开(公告)日：1997-09-05
申请号：JP4092696
申请日：1996-02-28
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA MOTOHIRO , SASAKI HIROSHI , OSUMI KATSUMI
IPC分类号： G21D3/00 , G21D3/08
摘要： PROBLEM TO BE SOLVED: To reduce the dose rate of a residual heat removing system by starting the operation of a residual heat removing system within a range of specified reactor water temperature and a reactor internal pressure gauge indicated value. SOLUTION: With the start of operation for stopping a plant, a control rod is inserted in fuel to stop nuclear reaction. The calorific value from fuel is decreased, and at the stage where the steam generation quantity is decreased and it is difficult to keep rated reactor pressure, power generation is stopped. When the reactor water temperature reaches below about 130 deg.C (reactor internal pressure gauge indicated value 2kg/cm ), warming operation is started. At the stage where a difference between the reactor water temperature and the residual heat removing system outlet temperature is about 50 deg.C or less, the warming operation is ended. After that, reator water is passed through the residual heat removing system, and a nuclear reactor accessary cooling water is introduced to a residual heat removing system heat exchanger 23 through a piping 29 to cool the reactor water in the residual heat removing system. Thus, by the operation of setting the operation start temperature of the residual heat removing system to about 130 deg.C (reactor internal pressure gauge indicated value 2kg/cm ) or less, it is possible to reduce adhesion of ion-like reactive matter to the residual heat removing system piping.

54. 发明专利

JPH095489A DOSE REDUCING METHOD FOR REACTOR RESIDUAL HEAT REMOVING SYSTEM 失效
公开(公告)号：JPH095489A
公开(公告)日：1997-01-10
申请号：JP15761895
申请日：1995-06-23
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI NUCLEAR ENG
发明人： AIZAWA MOTOHIRO , CHIBA YOSHINORI , NUMA JUNICHI , OSUMI KATSUMI
IPC分类号： G21C15/18 , G21D1/00 , G21D3/08
摘要： PURPOSE: To prevent the accumulation of a radioactive material on passage faces by feeding an environmental water having a low or no radioactivity concentration and a specific temperature to a residual heat removing system, and forming an oxide film on the passage faces of apparatuses and pipes made of carbon steel. CONSTITUTION: A control rod is extracted to allow nuclear fuel to react during the period in the initial stage of the start test in which the radioactive material concentration is relatively low. When a residual heat removing system reaches a film forming temperature (about 100-250 deg.C), a main steam isolation valve 25 and a main by-pass valve 26 are closed, then the control rod is inserted to stop the reaction of the nuclear fuel. The operation of the residual heat removing system is started, and the film forming process is applied to the inner faces of the apparatuses and pipes in the system. A heat exchanger inlet valve 28 is closed during this period to by-pass a residual heat exchanger 23, and the temperature drop of the system water is prevented. The temperature of the reactor water is maintained by the Joule's heat generated when a residual heat removing system pump 20 is operated. The radioactive material conveyed by the reactor water is prevented from being taken to the apparatuses and pipes.

55. 发明专利

JPH0644069B2 失效
公开(公告)号：JPH0644069B2
公开(公告)日：1994-06-08
申请号：JP11645985
申请日：1985-05-31
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： OSUMI KATSUMI , ASAKURA YAMATO , KONDO MASAYOSHI , AIZAWA MOTOHIRO
IPC分类号： G21D1/00 , C25D11/00

56. 发明专利

JPH05172985A REACTOR WATER ENVIRONMENT MONITORING SYSTEM 失效
公开(公告)号：JPH05172985A
公开(公告)日：1993-07-13
申请号：JP34437991
申请日：1991-12-26
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA MOTOHIRO
IPC分类号： G01N27/06 , G01N27/416 , G21C17/003 , G21C17/02
摘要： PURPOSE:To contribute to reducing the radiation received by the workers during inspection work and maintaining the intactness of plant materials by accurately measuring the elevation behavior of the plant dose rate during plant operation and providing a reactor water environment monitoring equipment having a high temperature sensor. CONSTITUTION:This system is provided with an equipment to accurately measure the amount of radioactives depositing on the material surface contacting to reactor water during plant operation, an equipment to directly monitor the water quality environment in the reactor water environment and the corrosion environment, a radioactive deposition amount monitoring pipe 26, and a corrosion environment monitoring pressure vessel 36 to improve the reliability of plant operational administration.

57. 发明专利

JPH0416795A IRON INJECTOR FOR REACTOR FEED WATER OF BOILING WATER REACTOR POWER PLANT 失效
公开(公告)号：JPH0416795A
公开(公告)日：1992-01-21
申请号：JP12204390
申请日：1990-05-11
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI KYOWA KOGYO KK
发明人： AIZAWA MOTOHIRO , KATAOKA ICHIRO , OSUMI KATSUMI , ICHIMURA AKIRA , SAWA TOSHIO
IPC分类号： G21D3/08 , G21D1/00 , G21F9/28
摘要： PURPOSE:To improve efficiency of iron injection by injecting iron in the form of crud instead of ion into reactor feed water. CONSTITUTION:The feed water flowing through a pipe 36 into a tank 1 is elevated in its electric conductivity by injecting carbon dioxide gas from a nozzle 4, and flows through a pipe 13, into an electrolysis tank 2, and then between iron plate electrodes 5 where iron ion is solved in by electrolysis. By injecting inert gas in the tank 2 from a nozzle 6 bellow the electrodes, stripping of oxigen gas and clearing of extraneous matter on the electrodes are made during the electrolysis. The water including iron ion made in the electrolysis tank 2 flows through a pipe 14 into a reaction tank 8 where the iron ion is changed into crud of iron hydroxide or iron oxide by injecting air from a nozzle 8'. The said carbon dioxide gas, inert gas and air supplied are exhausted from nozzles 55 at the top of the tanks 2 and 8, and the water including crud-form iron made in the above way is injected into the reactor feed water through a pipe 56 and a water injection pump 15.

58. 发明专利

JPS62181834A MANUFACTURING METHOD FOR PIPE USED IN NUCLEAR POWER PLANT 失效
公开(公告)号：JPS62181834A
公开(公告)日：1987-08-10
申请号：JP2012986
申请日：1986-02-03
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： HONDA TAKU , KASHIMURA EIJI , OHASHI TAKEYA , FURUYA YASUMASA , OSUMI KATSUMI , AIZAWA MOTOHIRO
IPC分类号： B23P13/00 , C22C38/00 , F16L9/02 , F16L58/00 , G21D1/00
摘要： PURPOSE:To make it possible to restrain the accumulation of radio-active materials, by using SUS316 or SUS316L as a material for a pipe, by pickling and washing the material after solid solution heat treatment, and then by polishing the material so that the surface-roughness is less than 6S while no metal crystal grain boundary is exposed. CONSTITUTION:SUS316 or SUS316L is used as a material for a primary cooling water system pipe. The inner surface of the material is pickled with the use of fluorine nitrate solution after solid solution heat treatment, and is sufficiently washed with distilled water. Further, it is polished by, for example, a flapper polishing process so that it has a surface-roughness of less than 6S. Thus, since the SUS316 or SUS316L has a stable austenite structure so that no martensite induced by machining occurs due to mechanical polishing, metals crystal grin boundary is vanished due to the polishing, and the growth of an oxide film is restrained, while the outer surface thereof is coated uniformly with a film to enhance the corrosion-resistance, and further, the accumulation of cobalt may be minimized. Even though any other mechanical polishing method my be used to obtain the same result, thereby it is effective to reduce the exposure against the operator.

59. 发明专利

JPS5987393A DEVICE FOR CONTROLLING HUMIDITY IN REACTOR CONTAINER 失效
公开(公告)号：JPS5987393A
公开(公告)日：1984-05-19
申请号：JP19597882
申请日：1982-11-10
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA MOTOHIRO , OOSUMI KATSUMI
IPC分类号： G21C13/00 , G21C13/02

60. 发明专利

JP2003098294A DECONTAMINATION METHOD USING OZONE AND APPARATUS THEREFOR 审中-公开
公开(公告)号：JP2003098294A
公开(公告)日：2003-04-03
申请号：JP2001295916
申请日：2001-09-27
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NAGASE MAKOTO , HOSOKAWA HIDEYUKI , ANAZAWA KAZUMI , AIZAWA MOTOHIRO , CHIBA YOSHINORI
IPC分类号： G21F9/28 , C02F1/42 , G21C19/307 , G21F9/00
摘要： PROBLEM TO BE SOLVED: To provide an easy decontamination method for performing decontamination at a low cost without generating any secondary waste product. SOLUTION: Liquid ozone is vaporized, and the vaporized ozone is introduced into a re-circulating line 2 at the upstream side of a re-circulating pump 3 and dissolved in reactor water to generate ozone water. The ozone water thus generated is made to flow in an atomic reactor re-circulating system to reduce radioactivity adhering to the surface of metal.

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