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1. 发明专利

JP2002048891A CORE OPERATION CONTROLLER 失效
公开(公告)号：JP2002048891A
公开(公告)日：2002-02-15
申请号：JP2000236742
申请日：2000-08-04
申请人： HITACHI LTD
发明人： SONEDA HIDEO , MORIYA KIMIAKI , GOTO YUKINORI , YASUDA KENICHI
IPC分类号： G21C7/08 , G21C7/26 , G21C17/00
摘要： PROBLEM TO BE SOLVED: To increase a load factor in operation conditions satisfying the thermal margin limit value of the core in cycle operation after startup of a boiling water reactor. SOLUTION: In a core operation controller controlling the power of the boiling water reactor 1 by controlling the control rods 3 position in the core and a core flow 8, a core performance calculation means 11 periodically calculating an operating minimum critical power ratio (MCPR) based on the results of three dimensional power distribution in the core, an automatic thermal limit monitoring means 12 monitoring whether proper margin is maintained by comparing the operation MCPR with a target MCPR set in advance, and an automatic power control means 13 outputting signals changing core flow by changing core flow rate or the control rods to a recirculation flow controlling system 14 and a control rod drive control system 15 so that operation MCPR margin proper for the target MCPR is maintained, are provided.

2. 发明专利

JPH01305397A SURVEILLANCE OF NEUTRON FLUX IN NUCLEAR REACTOR AND APPARATUS FOR NEUTRON MEASUREMENT 失效
公开(公告)号：JPH01305397A
公开(公告)日：1989-12-08
申请号：JP13560388
申请日：1988-06-03
申请人： HITACHI LTD
发明人： GOTO YUKINORI
IPC分类号： G21C17/108 , G21C17/00 , G21C17/10
摘要： PURPOSE:To intend to suppress downgrading of an extent of a thermal melting by transmitting suppression signal against output rise in case that a predetermined value, as a function of a ratio which is a ratio of the maximum neutron flux value of each local region to a signal of a core average neutron flux value, surpasses the signal of a core average neutron flux value. CONSTITUTION:The inside of a core is divided into a plurality of local regions, signals from neutron flux detectors 10a to 10d belonging to each local region are averaged by an averaging circuit 20 and neutron flux signals a of local regions are transmitted. Each neutron flux signal ai of local regions gets its maximum value MAXai determined by a maximum value detector circuit 50. Signals from the detectors 10a to 10d are averaged by an averaging circuit 30 with signals from neutron flux detectors in other local regions, and then a core average neutron flux signal b is transmitted. The maximum value MAXai and the signal b are input to a function generator 60 to generate f(MAXai/b) as a function of these ratios. A predetermined value f(MAXai/b) is compared to the signal b by a comparator 70 and when the signal b surpasses the predetermined value f(MAXai/b), a suppression signal against an output rise is transmitted.

3. 发明专利

JPH06273563A PROTECTING EQUIPMENT OF REACTOR 失效
公开(公告)号：JPH06273563A
公开(公告)日：1994-09-30
申请号：JP6018593
申请日：1993-03-19
申请人： HITACHI LTD
发明人： GOTO YUKINORI , SASAGAWA MASARU , KANETO KUNIKAZU
IPC分类号： G21C7/08
摘要： PURPOSE:To reduce a burden on an operator in charge of calibration of local area neutron flux signal detectors by lessening the number of the detectors by adding functions of stopping withdrawal of fuel rods and preventing an increase in distortion of an output distribution to protecting equipment. CONSTITUTION:A core 1 is divided into a plurality of local areas. Signals from allotted neutron flux detectors 3 are averaged 4, a local neutron flux signal (ai) is delivered, a maximum value is received 5 and a maximum neutron flux signal MAXai is outputted. Meanwhile, signals from all of the detectors 3 in the core 1 are averaged 6 and a core average neutron flux signal (b) is outputted. A function generator 7 sets a set value (f) (MAXai/b), a value f/b is determined by a comparator 8 and an output rise control signal is delivered therefrom when this value exceeds 1. On the other hand, control rods 2 belonging to the same control area are grouped, positional deviations of the control rods 2 in the group are detected 9, tolerance determination 10 is executed and a withdrawal stop signal is delivered. Since a local monitoring range extends over the whole control area, according to this constitution, the number of the averaging circuits 4 can be reduced.

4. 发明专利

JPH1152088A HEAVY-WATER-COOLED BREEDER REACTOR 失效
公开(公告)号：JPH1152088A
公开(公告)日：1999-02-26
申请号：JP21290797
申请日：1997-08-07
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： OHASHI MASAHISA , KANETO KUNIKAZU , GOTO YUKINORI , YAMADATE MEGUMI , YOKOMI MICHIROU
IPC分类号： G21C3/328 , G21C3/62 , G21C7/22
摘要： PROBLEM TO BE SOLVED: To provide a reactor using water coolant, having fuel breeding capability and improving safety. SOLUTION: In a reactor using liquid phase heavy water 27 as coolant and assembly type fuel bundling a multitude of fuel pins 1, oxide fuel is used, the volume ratio of coolant to fuel in the axial middle part of core is made 0.5 to 1.0 and the core height meaning the vertical regional length of core fuel pellets 2 excluding blanket is made 1 m or less. In other option, metal fuel or nitride fuel is used, the volume ratio of coolant to fuel in the axial middle part of core is made 0.5 to 1.7 and the core height meaning the vertical regional length of core fuel pellets 2 excluding blanket is made 1 m or less.

5. 发明专利

JPH102980A MANUFACTURE OF FUEL ASSEMBLY AND FUEL ASSEMBLY 失效
公开(公告)号：JPH102980A
公开(公告)日：1998-01-06
申请号：JP15259796
申请日：1996-06-13
申请人： HITACHI LTD
发明人： SASAGAWA MASARU , FUJIMAKI SHINGO , GOTO YUKINORI , KOKUBU TAKEHIKO , IZUTSU SADAYUKI , FUJITA SATOSHI
IPC分类号： G21C3/328 , G21C3/62
摘要： PROBLEM TO BE SOLVED: To facilitate setting of plutonium enrichment rate of each fuel rod in a method for manufacturing a fuel assembly using plutonium containing relatively little thermal fissionable Pu nuclide for an outside fuel rod by using plutonium containing much thermal fissionable Pu nuclide for a central side fuel rod. SOLUTION: When a predetermined amount of plutonium material substance is supplied from spent fuel, total average thermal fissionable plutonium composition ratio is detected. It is separated into high Puf composition group containing higher average thermal fissionable plutonium composition ratio and lower average thermal fissionable Puf composition group containing lower average ratio. These two groups of plutonium enrichment rates are decided in response to the equivalent fissile coefficient of mean of fuel assembly 11, and respectively charged in pellets of fuel rod 12 of number 1 at the central side of a lattice-like configuration and fuel rod 12 of numbers 2 to 4 of an outer peripheral side.

6. 发明专利

JPH07128471A METHOD FOR MANUFACTURING FUEL ASSEMBLY 失效
公开(公告)号：JPH07128471A
公开(公告)日：1995-05-19
申请号：JP27364493
申请日：1993-11-01
申请人： HITACHI LTD
发明人： SASAGAWA MASARU , GOTO YUKINORI , KANAZAWA NOBUHIRO
IPC分类号： G21C3/328 , G21C3/62
摘要： PURPOSE:To manufacture a fuel assembly wherein the change of nuclear properties of the fuel assembly due to the difference of a uranium-235 content in fuel material can be controlled in a method for manufacturing the fuel assembly filled with the fuel material containing uranium and plutonium. CONSTITUTION:When a fuel assembly filled with fuel material containing uranium and plutonium is manufactured, fissionable material mass of numerals 6, 7, 8 in the fuel material can be adjusted and a neutron effective multiplication constant in the burnup middle period and a local output peaking coefficient in the burnup initial period are made equivalent in response to the differences of the uranium-235 content of the fuel material 6, 7, 8. Therefore, conditions of the fissionable material mass necessary for making reactor core operation cycle intervals constant are satisfied without any excess and lack and the fuel assembly for controlling the change of the neutron effective multiplication constant and the local output peaking coefficient can be provided.

7. 发明专利

JPS61286909A PLANT SIMULATOR DEVICE FOR FORECASTING STATE 失效
公开(公告)号：JPS61286909A
公开(公告)日：1986-12-17
申请号：JP5229385
申请日：1985-03-18
申请人： HITACHI LTD
发明人： GOTO YUKINORI
IPC分类号： G05B23/02 , G21C17/00
摘要： PURPOSE:To offer necessary information quickly to an operator by correcting the inner variable of an initializing data collecting part at the generation of an unforecasted event after starting a simulator and restarting the simulator. CONSTITUTION:At the start of the simulator, plant data stagnated immediately before the generation of an accident are collected 1 on the basis of plant data 1 collected before and after the generation of the accident to identify 3 the cause and size of the accident. In addition, the abnormality 4 of an apparatus and the operation 5 of the operator which have been already confirmed up to the time are transferred to an initialization control part as initializing data to start a dynamic characteristic model 7. When the abnormality of the apparatus is newly confirmed by a real plant or when operator's operation which is not supposed on the way of forecasting is executed, the data temporarily stored in an initializing data collecting part 9 are corrected on the basis of the abnormality 4 of the apparatus and the operator's operation 5 and then the dynamic characteristic model 7 is restarted. Consequently, necessary information can be quickly offered to the operator.

8. 发明专利

JP2001147286A MEASUREMENT METHOD FOR VOID REACTIVITY COEFFICIENT AND DEVICE 失效
公开(公告)号：JP2001147286A
公开(公告)日：2001-05-29
申请号：JP33166899
申请日：1999-11-22
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： GOTO YUKINORI , MASUHARA YASUHIRO , FUKAHORI TAKANORI
IPC分类号： G21C17/00
摘要： PROBLEM TO BE SOLVED: To provide a void reactivity coefficient measuring device accurately measurable of void reactivity coefficient during operation without changing core state. SOLUTION: With a reactor system measuring APRM signal as measured signal of the core and the signal of core flow and core pressure showing core state quantities, each transmission function is obtained from the reactivity fluctuation capable of evaluating by a reverse operation of the APRM signal and the void reactivity fluctuation capable of evaluating by the flow rate signal. From this ratio, void reactivity coefficient is evaluated. By this, void reactivity coefficient during operation is highly accurately measured without changing the state.

9. 发明专利

JP2000162353A FUEL ASSEMBLY 失效
公开(公告)号：JP2000162353A
公开(公告)日：2000-06-16
申请号：JP33530098
申请日：1998-11-26
申请人： HITACHI LTD
发明人： GOTO YUKINORI , MASUHARA YASUHIRO
IPC分类号： G21C3/326 , G21C3/32 , G21C7/27
摘要： PROBLEM TO BE SOLVED: To flatten output distribution even in the latter half of a fuel cycle by positioning the opening part of an upper cooling material descent channel at an upper portion as compared with that of a lower one. SOLUTION: A water rod 4 is composed of upper and lower stages, and a cooling material inflow port 5 at the lower end part of cooling material ascent channels 7 passes through the fuel rod support part of a lower tie plate 3 for opening into the space of the lower tie plate 3. Also, the upper cooling material ascent channel 7 becomes the internal pipe in the lower cooling material ascent channel 7, and the cooling material inflow port 5 is connected to the upper water rod. Furthermore, the upper and lower parts have an inversion part that is connected to a cooling material descent channels 8 at the upper end part of the cooling material ascent channel 7, and a cooling material discharge port 6 at the lower end of the cooling material descent channel 8 is opened upward as compared with the fuel rod support part. At the opening part, an upper part is positioned upward as compared with a lower one, thus setting the water level of cooling material in the upper cooling material ascent channel 7 higher than that in the lower cooling material ascent channel 7, and hence flattening output distribution even in the latter half of a fuel cycle.

10. 发明专利

JP2543576B2 失效
公开(公告)号：JP2543576B2
公开(公告)日：1996-10-16
申请号：JP13560388
申请日：1988-06-03
申请人： HITACHI LTD
发明人： GOTO YUKINORI
IPC分类号： G21C17/108 , G21C17/00 , G21C17/10

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