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    • 6. 发明专利
    • CORROSION POTENTIAL SENSOR, BOILING WATER REACTOR POWER PLANT AND pH SENSOR
    • 腐蚀潜在传感器,锅炉水反应堆发电厂和pH传感器
    • JP2003004887A
    • 2003-01-08
    • JP2001187955
    • 2001-06-21
    • Hitachi Ltd株式会社日立製作所
    • WATANABE RYUJISAKAI MASANORITAKAHASHI TAKUYAAKAMINE KAZUHIKO
    • G21C17/02G21D1/00
    • Y02E30/40
    • PROBLEM TO BE SOLVED: To provide a corrosion potential sensor provided with a structure densely filling a specific amount of oxide powder in a limited space and capable of a long term use and a boiling water reactor power plant.
      SOLUTION: The corrosion potential sensor has a sensor box which is made by connecting a cylindrical metal body 5 to the open end of a zirconia cylinder 1 closed at the one end by way of an intermediate metal cylinder 6 for connection and has a structure that metal powder 3 for power collection and metal oxide powder 2 for electrochemical system consisting of a compact are sealed in the zirconia cylinder 1 and a potential detection lead conductor 4 is arranged for short-circuiting the metal powder 3 for power collection to detect the potential by a mineral-insulated cable 7 by way of the lead conductor 4. The packing density of silver oxide rises to 2 to 3.5 times compared with conventional natural packing method, which prevents the zirconia tube inside from silver oxide depletion, maintains oxygen partial pressure constant for a long period and makes to obtain a corrosion potential sensor capable of long term use.
      COPYRIGHT: (C)2003,JPO
    • 要解决的问题:提供一种腐蚀电位传感器,该腐蚀电位传感器具有在有限空间中能够长期使用的特定量的氧化物粉末和沸水反应堆发电厂的结构。 解决方案:腐蚀电位传感器具有传感器盒,该传感器盒通过将圆柱形金属体5连接到通过用于连接的中间金属圆筒6在一端封闭的氧化锆气缸1的开口端而制成,并且具有金属 用于集电的粉末3和由紧凑件组成的电化学系统的金属氧化物粉末2密封在氧化锆圆筒1中,并且设置潜在的检测引线导体4,用于短路用于集电的金属粉末3以通过 矿物绝缘电缆7通过引线导体4.氧化银的填充密度比传统的天然填充方法上升2至3.5倍,这防止氧化锆管内部氧化银消耗,维持氧分压恒定 使得获得能够长期使用的腐蚀电位传感器。
    • 7. 发明专利
    • METHOD FOR FORMING CATALYST SURFACE
    • JPH11295480A
    • 1999-10-29
    • JP10082598
    • 1998-04-13
    • HITACHI LTD
    • WADA YOICHIUETAKE NAOTOTACHIBANA MASAHIKOAKAMINE KAZUHIKO
    • G21D1/00
    • PROBLEM TO BE SOLVED: To limit an execution point and at the same time control the amount of injection of a catalyst, by allowing a catalyst element to adhere while the temperature of reactor cooling water is at a temperature where it cannot be boiled under atmospheric pressure and a surface density is at a specific value. SOLUTION: After a pressure container 3 is released on periodical inspection, a reactor water level 10 is controlled according to the region of a structure for gluing a catalyst in the pressure container 3. While a fuel 5 is loaded, the reactor water level 10 cannot be decreased since radiation needs to be shielded, thus setting the fully high reactor water level 10 and gluing a catalyst to the structure of the large part of the inside of the pressure container 3. By directly pouring a compound containing a catalyst element into reactor water in the pressure container 3 via an injection line 2, the catalyst is glued to the entire surface of the pressure container 3, a shroud 4, a shroud support 6, a pressure container bottom part 7, a reactor core support plate 8, and an upper lattice plate 9 so that the surface density reaches 0.5 μg/cm or higher.
    • 8. 发明专利
    • BOILING WATER ATOMIC POWER PLANT
    • JPH10232293A
    • 1998-09-02
    • JP3602197
    • 1997-02-20
    • HITACHI LTD
    • NAKAMURA MASAHITOAKAMINE KAZUHIKO
    • G21C19/307G21D3/00
    • PROBLEM TO BE SOLVED: To simplify a facility of an entire plant including a radioactive waste disposal facility by simplifying a facility of a condensate purifying system and to further reduce a generated amount of radioactive waste. SOLUTION: Vapor generated in a nuclear reactor is worked in a turbine 2, then condensed by a condenser 3 of a condensate purifying system, and guided to a feed water system via a low pressure condensate pump 4, condenser filter 5 and a high pressure condensate pump 6. That is, a condensate desalting unit is omitted. Insoluble impurities such as iron clad in the condensate are removed by the filter 5. A coolant purifying system 12 of the reactor is guided from a recirculating system 13 of the reactor, and guided to the reactor via a regenerative heat exchanger 9, non-regenerative heat exchanger 10, filter desalting unit 11 and the exchanger 9. The soluble impurities (ion components) and insoluble impurities in water of the reactor are removed by the unit 11.