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1. 发明专利

JPS62195597A MEASURING DEVICE FOR DISCHARGE FROM RELIEF SAFETY VALVE 失效
公开(公告)号：JPS62195597A
公开(公告)日：1987-08-28
申请号：JP3752186
申请日：1986-02-24
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： KOYAMA KAZUHIKO , SANO KENICHI , KOJIMA AKIRA
IPC分类号： G21C17/032 , G21C17/00 , G21C17/003 , G21C17/02 , G21D1/00

2. 发明专利

JPS6472025A VAPOR LEAK MONITORING DEVICE 失效
公开(公告)号：JPS6472025A
公开(公告)日：1989-03-16
申请号：JP22858687
申请日：1987-09-14
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： SANO KENICHI , KOYAMA KAZUHIKO , KOJIMA AKIRA
IPC分类号： G01M3/24
摘要： PURPOSE:To discriminate between vibration due to a vapor steam and other vibration by separating a detection signal from a vibration detector into plural frequency components and comparing the level ratio of the respective frequency components with a reference set value. CONSTITUTION:The detection signal of the vibration detector 1 is passed through a preamplifier 2 and a main amplifier 3, then passed through a frequency component separator consisting of plural BPFs 4, and converted 5 into effective values. They are A/D-converted 6 and then inputted to a microcomputer 7. The microcomputer 7 is stored with power levels of the respective frequency components at the time of a background noise or vapor leak and their total power level, and set values for detecting variation are provided above and below the total power level of the respective frequency components based on the total power level. Then it is decided whether or not the power of each smoothed frequency component exceeds the set values. When there is a frequency component exceeding the set values, a decision is made according to the fact that the background noise has many low frequency components and the vapor leak has many high frequency components; when leak occurrence is decided, a warning is displayed 8.

3. 发明专利

JPS5776494A Pressure suppression device 失效
公开(公告)号：JPS5776494A
公开(公告)日：1982-05-13
申请号：JP15232580
申请日：1980-10-31
申请人： Tokyo Shibaura Electric Co , Nippon Atomic Ind Group Co
发明人： KOJIMA AKIRA , NAGASAKA HIDEO , MASUDA FUJIO
IPC分类号： G21C9/004 , G21C15/18
CPC分类号： Y02E30/40

4. 发明专利

JPS5756787A Nuclear reactor pressure suppression device 失效
标题翻译：核反应堆压力抑制装置
公开(公告)号：JPS5756787A
公开(公告)日：1982-04-05
申请号：JP13155080
申请日：1980-09-24
申请人： Tokyo Shibaura Electric Co , Nippon Atomic Ind Group Co
发明人： KOJIMA AKIRA , NAGASAKA HIDEO , MASUDA FUJIO
IPC分类号： G21C9/004 , G21C9/00 , G21C13/00
CPC分类号： Y02E30/40

5. 发明专利

JPS62251698A NUCLEAR-REACTOR WATER-LEVEL LOWERING REDUCER 失效
公开(公告)号：JPS62251698A
公开(公告)日：1987-11-02
申请号：JP9615986
申请日：1986-04-25
申请人： TOSHIBA CORP , TOSHIBA ENGINEERING CO
发明人： KOJIMA AKIRA , MORITA KENJI
IPC分类号： G21D3/08 , G21C15/18

6. 发明专利

JPS61212793A EMERGENCY STOP DEVICE FOR NUCLEAR REACTOR 失效
公开(公告)号：JPS61212793A
公开(公告)日：1986-09-20
申请号：JP5406585
申请日：1985-03-18
申请人： TOSHIBA CORP
发明人： ANDO MASAKI , KOJIMA AKIRA
IPC分类号： G21C9/02

7. 发明专利

JPH01299493A FUEL ASSEMBLY 失效
公开(公告)号：JPH01299493A
公开(公告)日：1989-12-04
申请号：JP12842488
申请日：1988-05-27
申请人： TOSHIBA CORP
发明人： KOJIMA AKIRA
IPC分类号： G21C3/324 , G21C3/30 , G21C3/322 , G21C3/328 , G21C3/33
摘要： PURPOSE:To improve a hydrodynamic safety of a channel and a stability of a reactor core, by providing a grid-shaped flow restrictor on a lower tie-plate and by uniforming a bundle flow rate. CONSTITUTION:A grid-shaped flow restricting plate 38 is placed at a core flow pass part of a lower tie-plate 35. By this flow restricting plate, a uniform core flow is obtained and also a pressure coefficient can be increased. In other words, such a fuel assembly has a larger ratio of a pressure loss in a single-phased flow part to that in a double-phased flow part compared to other cases. Therefore, a flow rate fluctuation of a coolant at a core inlet and a fluctuation of a reactor core output can be effectively suppressed and a core stability can be intended to be much improved.

8. 发明专利

JPH01244393A CONTROL ROD DRIVING/CONTROLLING DEVICE 失效
公开(公告)号：JPH01244393A
公开(公告)日：1989-09-28
申请号：JP6961988
申请日：1988-03-25
申请人： TOSHIBA CORP
发明人： KOJIMA AKIRA
IPC分类号： G21C7/08 , G21C7/26 , G21C7/27
摘要： PURPOSE:To hold a reactor core condition stable in operation at the time of spectrum shift operation and widen an operation range by selecting a value of higher flow rate among values indicated by intersecting points of a recirculating weight control curve and 100% output as the lower limit of the flow rate of spectrum shift operation. CONSTITUTION:The output distribution of a reactor core is obtained from the result in which the signals of a reactor neutron detector 13 are input in an output distribution measuring device 15 through a localized output range monitor system 14A and an average output range monitor 14B. The output of the output distribution measuring device 15 is input in a block 1. In the block 1, the output distribution is estimated when the pump speed is descended lower than the present output, a recirculating flow control curve for holding sufficient stability at the time of the maximum output of lowest pump speed and the lower limit of automatic flow is obtained from a stable line calculating program and a recirculating flow control curve calculating program, further the intersecting point of it and 100% output is obtained and larger flow rate is set as the lower limit of the spectrum shift operation to output in a block 2. The block 2 outputs a control rod pulling prevention signal on the basis of the lower limit of the flow.

9. 发明专利

JPS63256892A RECIRCULATING FLOW CONTROLLER 失效
公开(公告)号：JPS63256892A
公开(公告)日：1988-10-24
申请号：JP8971087
申请日：1987-04-14
申请人： TOSHIBA CORP
发明人： KOJIMA AKIRA
IPC分类号： G21C7/26

10. 发明专利

JPH03251797A CONTROLLING DEVICE OF RECIRCULATION FLOW RATE OF BOILING WATER NUCLEAR REACTOR HAVING FULL BYPASS SYSTEM 失效
公开(公告)号：JPH03251797A
公开(公告)日：1991-11-11
申请号：JP4824590
申请日：1990-02-28
申请人： TOSHIBA CORP
发明人： KOJIMA AKIRA
IPC分类号： G21D3/04
摘要： PURPOSE:To maintain a stability of reactor core part and to enable maintaining a low power operation by reducing a rotation of a recirculation pump to the lowest allowable flow rate at an occasion of a generator load to be cut off, and by tripping the pump at an occasion of failed run-back operation. CONSTITUTION:In case that a generator load is cut off 1 when a nuclear reactor output is higher than a specific value, the reactor output is made to decrease 7 by reducing rotation of a recirculation pump to a rotation speed giving the lowest allowable flow rate of the pump by inserting 5 selective control rods and by running-back 40 of the circulation pump. Moreover, when the running- back of the recirculation pump is failed 41 or turbine by-pass valves do not work 8, the nuclear reactor is made to scram 10 and the recirculation pump is made to trip 6, as well. With these procedures, an operation under a natural convection condition which is less stable for a reactor core part, can be avoided, during sudden closing 3 of a turbine control valve and sudden opening 4 of a turbine by-pass valve, and therefore a low output operation can be maintained.

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