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1. 发明专利

JPH09211175A INTERNAL PUMP SYSTEM 失效
公开(公告)号：JPH09211175A
公开(公告)日：1997-08-15
申请号：JP4055496
申请日：1996-02-02
申请人： HITACHI LTD
发明人： SUZUKI KATSUYUKI , MIZUIDE ARITOSHI , MURATA KIMIKO , MIYAMOTO YOSHIYUKI , TANIGAWA SHOJI
IPC分类号： G21C7/26 , G21C15/243 , G21D3/08
摘要： PROBLEM TO BE SOLVED: To secure the operating condition of a highly reliable and stable internal pump system by adopting an MG set with fluid joint as a variable frequency power source and judging the condition of a pump quickly when a specific internal pump restarts. SOLUTION: In an internal pump system in a boiling water reactor power plant where a recirculation MG set with a fluid joint 4 is used as a variable frequency power source for internal pumps 1a to 1e, a pump motor where the time lag in synchronous operation occurs is identified by detecting the revolving speed of each of a recirculation MG set alternator 6 and internal pump motors 2a to 2e or a current outputted from the alternator 6 and a current inputted into the pump motors 2a to 2e and comparing the condition of synchronous operation in the alternator 6 with that of the pump motors 2a to 2e. If the time lag in the synchronous operation exceeds a prescribed value set beforehand, the internal pumps 2a to 2e are tripped.

2. 发明专利

JPH10332872A INTERNAL PUMP SYSTEM 失效
公开(公告)号：JPH10332872A
公开(公告)日：1998-12-18
申请号：JP14215297
申请日：1997-05-30
申请人： HITACHI LTD
发明人： MIZUIDE ARITOSHI , MURATA KIMIKO , MIYAMOTO YOSHIYUKI , TANIGAWA SHOJI
IPC分类号： G21C7/26 , G21C15/243 , G21C17/10 , G21D1/00
摘要： PROBLEM TO BE SOLVED: To provide a control system maintaining reactor stability by disturbing the insertion of selective control rods in the case the power voltage of variable frequency power source gradually lowers and inserting the selective control rods only in the case a failure instantaneously loosing the variable frequency power source in a system connected by a plurality of internal pumps to a variable frequency power source. SOLUTION: A selective control rod insertion circuit 100 are input with a reactor power signal S14, a power voltage low signal (S4a or S4b) of an MG set with a fluid coupling and a power voltage lowering rate high signal (S7a or S7b) of an MG set with fluid coupling. Only when the reactor power is at or over a set value of reactor power and the power voltage low signal and the power voltage lowering rate high signal are input from the same MG set with fluid coupling, it outputs a selective control rod insertion signal S100 to a selective control rod driver 12. By this, an erroneous operation of inserting the selective control rods in the case the MG set power voltage gradually lowers and disturbance generation are prevented.

3. 发明专利

JPH1193891A INTERNAL PUMP SYSTEM 失效
公开(公告)号：JPH1193891A
公开(公告)日：1999-04-06
申请号：JP25642597
申请日：1997-09-22
申请人： HITACHI LTD
发明人： MIZUIDE YUUSHIYUN , MURATA KIMIKO , MIYAMOTO YOSHIYUKI , TANIGAWA SHOJI
IPC分类号： G21C15/243 , F04D7/08 , F04D29/00 , G21D3/04
摘要： PROBLEM TO BE SOLVED: To avoid a nuclear reactor output reducing phenomenon at instantaneously stopping time by connecting an MG set to the downstream side of a single stationary variable frequency power source device, and connecting plural internal pumps to the MG set. SOLUTION: In an internal pump system of a boiling water nuclear power plant, for example an MG set composed of an AC generator 4a and an AC electric motor 5a is connected to the downstream side of a single stationary variable frequency power source device, and five internal pump driving electric motors 2a to 2e are also connected to the AC generator 4a, and internal pumps 1a to 1e are connected in series to each single unit of the respective driving generators. If instantaneous stopping is caused by a system accident, bus bar voltage temporarily reduces. However, the stationary variable frequency power source device stops by reduction in the bus bar voltage, and source voltage inputted to the MG set reduces, but even if the bus bar voltage reduces for a short time by mechanical inertia of the MG set, output voltage to the respective internal pumps is not reduced.

4. 发明专利

JPH09211174A PUMP CONTROL SYSTEM 失效
公开(公告)号：JPH09211174A
公开(公告)日：1997-08-15
申请号：JP3740696
申请日：1996-01-31
申请人： HITACHI LTD
发明人： SUZUKI KATSUYUKI , MIZUIDE ARITOSHI , MURATA KIMIKO , MIYAMOTO YOSHIYUKI , TANIGAWA SHOJI
IPC分类号： G21C7/26 , G21C15/243 , G21D3/08
摘要： PROBLEM TO BE SOLVED: To provide a control system which stabilizes the restart of an internal pump during the operation of a reactor and has a sufficient margin in the characteristics of pump restarting. SOLUTION: This control system controls a pump in a power plant where an MG set with a fluid joint 4 including an alternator 5 with larger inertia is used as a variable frequency power source for internal pumps 16a to 16e with smaller inertia. In this case, the system has an automatic voltage adjusting means 100 and a recirculation flow rate controlling means 400. The system 100 adjusts the pump to a prescribed alternator voltage and is equipped with a function for correcting an alternator voltage. The recirculation low rate controlling means 400 controls the position of a scoop pipe of the fluid joint 4, and is equipped with a function for correcting the speed of the alternator or the position of the scoop pipe. When the internal pumps 16a to 16e restart, the speed of the alternator is corrected beforehand and the voltage of it is corrected upward.

5. 发明专利

JP2000131480A REACTOR RECIRCULATION PUMP CONTROL SYSTEM AND ITS POWER SUPPLY DEVICE 失效
公开(公告)号：JP2000131480A
公开(公告)日：2000-05-12
申请号：JP30503798
申请日：1998-10-27
申请人： HITACHI LTD
发明人： SAKATA TOMOTAKA , MURATA KIMIKO
IPC分类号： G21C7/26 , G21D3/04
摘要： PROBLEM TO BE SOLVED: To avoid the tripping of an RID-ASD as much as possible and to secure the thermal soundness of a fuel even if a bus voltage fluctuates due to a transmission line fault or the like by detecting the behavior of the bus voltage and using a logic for running back the RIP-ASD according to it. SOLUTION: In normal operation, an RIP-ASD controls the speed of a RIP so that reactor output can be subjected to constant control according to a signal from a recirculation flow rate control system 14. When a transmission line 6 is disturbed and the voltage behavior of a bus line 3 occurs, a voltage change rate and the deviation and phase difference of three-phase voltages are detected, a value is outputted to an RIP-ASD speed control device 10 by a bus voltage change monitoring device 9, and switching is made from the control system 14 to the device 10 when a prescribed value or higher is judged, thus controlling the speed of the RIP. More specifically, when a voltage is equal to or more than a set value, neither run-back nor trip is generated in the RIP and an output frequency is reduced to continue operation. When a voltage is equal to or less than the set value and a deviation difference and a phase difference are judged to be within the set value, a signal is outputted from the device 10, the control system is switched, the RIP starts run-back, and a reactor flow rate is reduced.

6. 发明专利

JPH10239488A RECIRCULATING PUMP TRIP SYSTEM 失效
公开(公告)号：JPH10239488A
公开(公告)日：1998-09-11
申请号：JP5698497
申请日：1997-02-25
申请人： HITACHI LTD
发明人： MURATA AKIRA , TANIGAWA SHOJI , MURATA KIMIKO
IPC分类号： G21D3/04
摘要： PROBLEM TO BE SOLVED: To ensure the thermal soundness of fuel when a reactor water level reaches a reactor water level high set value to cause a turbine trip. SOLUTION: In a boiling nuclear power plant which adapts internal pumps 1-1 to 1-10 as the recirculating pump of a reactor, the internal pumps being divided into a system A for performing an internal pump trip so as to moderate the rise of the reactor output in a turbine trip and the other system B, and has a function of detecting the quick close 7 of a main steam stop valve and the first stage post-pressure 2 of the turbine when the turbine is tripped on the basis of a rise of level of the reactor, and simultaneously tripping the internal pumps of the system A, it has an interlocking means 21 for arresting the trip 19 of the internal pumps of the system A by use of the voltage reduction signal 16 of the internal pump when the simultaneous trip of the internal pumps of the system B is caused by the accident of MFG systems 101B, 103B, and 102B.

7. 发明专利

JPH09211187A PUMP SPEED CONTROL SYSTEM 失效
公开(公告)号：JPH09211187A
公开(公告)日：1997-08-15
申请号：JP4429196
申请日：1996-02-06
申请人： HITACHI LTD
发明人： MURATA KIMIKO , MIZUIDE ARITOSHI , MIYAMOTO YOSHIYUKI , TANIGAWA SHOJI , SUZUKI KATSUYUKI
IPC分类号： G21C7/26 , G21C15/243 , G21D3/04
摘要： PROBLEM TO BE SOLVED: To make it possible to realize a stable plant operation even when an internal pump trips. SOLUTION: This control system consists of systems 1A and 1B where an MG set with a fluid joint including an alternator 4A with larger inertia is connected to pumps 8a to 8e with smaller inertia. The control system regulates the quantity of oil by changing the position of a scope pipe of the fluid joint 3A to control the pump speed in a power plant which controls the pump speed. In this case, a recirculation flow rate controlling means 10 is provided to judge the operating condition of the pump in rate of the systems and set the position of the scoop pipe on the basis of the operating condition of the pump. When a pump trips in a system, the controlling means 10 regulates the quantity of oil in the fluid joint 3A in the system and balances the pump speed there with that in a normal system.

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