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31. 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.

32. 发明专利

JPH1039069A FUEL ASSEMBLY AND SPACER THEREFOR 失效
公开(公告)号：JPH1039069A
公开(公告)日：1998-02-13
申请号：JP19179796
申请日：1996-07-22
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SONEDA HIDEO , TAKII TAICHI , AIZAWA YASUHIRO , TOMITA TAKASHI
IPC分类号： G21C5/06 , G21C3/33
摘要： PROBLEM TO BE SOLVED: To increase the holding force at the time of vibration, e.g. earthquake, without causing any trouble at the time of loading a fuel assembly into a reactor by causing surface contact between a second leaf spring and a loading section when the flexure of a first leaf spring exceeds a predetermined level. SOLUTION: The fuel assembly 1 comprises a plurality of fuel rods 2 which are bundled by means of spacers 3 and supported, at the upper and lower ends thereof, by means of upper and lower tie plates 4, 5 while being covered with a channel box 6. The fuel assembly spacer comprises leaf springs 11, 15, a leaf spring guard 12, and a fixing screw 13 wherein the fuel assemblies 1 are spaced apart from each other through the resilient recovery force of the leaf spring 11. When the leaf spring 11 is replaced by a predetermined amount or more, it touches the leaf spring 15. The space dH between the leaf spring 15 and the loading position of the leaf spring 11 is set larger than the maximum flexure of leaf spring when it is used in normal range. The leaf spring 11 touches the leaf spring 15 to increase the spring force thus enhancing the spacing function between the fuel assemblies.

33. 发明专利

JPH09264983A REACTOR CORE AND FUEL ASSEMBLY 失效
公开(公告)号：JPH09264983A
公开(公告)日：1997-10-07
申请号：JP7359796
申请日：1996-03-28
申请人： HITACHI LTD
发明人： TAKII TAICHI , SONEDA HIDEO , MORIYA KIMIAKI , AOYAMA TADAO , SHIMADA HIDEMITSU
IPC分类号： G21C5/00 , G21C3/328
摘要： PROBLEM TO BE SOLVED: To obtain a reactor core capable of being reduced in size a plant without decreasing the output of a reactor power plant by a constitution that the effective heating length of a fuel assembly is less than specific value and the output density of the heating amount per unit volume is larger than the specific value. SOLUTION: A fuel assembly having an effective heating length of 3.1m is loaded in a square lattice state having a lattice interval of 23.2cm, a control rod 3 having a cross-shaped section is inserted into the water gap area 2 of a fuel assembly periphery of both sides of a pair of diagonal lines of the assembly surrounded by a channel box 1 having a length of one inside of 20.9cm to constitute a reactor core, and output is controlled. Further, when the void ratio of cooling water in the box in which a water rod is removed is 40%, the ratio of the number of atoms of hydrogen to that of uranium is about 4.1. Thus, the output density of the core can be set to about 55kW/L while obtaining the allowance of reactor stop. The partial length fuel rod is located to reduce the pressure loss.

34. 发明专利

JPH08327776A CORE CONTROL SYSTEM OF BOILING WATER REACTOR, AND CORE CONTROL METHOD 失效
公开(公告)号：JPH08327776A
公开(公告)日：1996-12-13
申请号：JP13364095
申请日：1995-05-31
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TAKEUCHI KENICHI , MASUHARA YASUHIRO , SONEDA HIDEO , SAKAMOTO HIDETAKA , FUKAHORI TAKANORI
IPC分类号： G21C7/08 , G21C7/26 , G21C17/00 , G21C17/108 , G21D3/00
摘要： PURPOSE: To provide a core control system and method for boiling water reactor which can accurately predict the drift component varying with time, and estimate the stability margin during a transient event, and immediately after the end of the event. CONSTITUTION: Provided are a delay filter 7 which takes in neutron flux signal data of an APRM or an LPRM which are monitoring signals of a boiling water reactor core and predicts drift component, a self-correlater 8 for calculating a self-correlating value sequentially based on the prediction, an stability evaluator 22 for calculating a width reduction ratio based on the self-correlation value and evaluating stability margin of the core, and an indication device 11 for displaying the stability margin in a core monitoring device 24. Further a controlling device 23 is provided with an SPI operator 14 receiving a control rod selection and insertion signal from a judging device 13, an SPI device 15 directing insertion based on the signal, a control rod drive mechanism 16 inserting control rod in the core by the direction, and a flow controller 31 controlling the core flow rate.

35. 发明专利

JPH03278183A METHOD AND DEVICE FOR DISPLAY OF THREE-DIMENSIONAL PHYSICAL QUANTITY 失效
公开(公告)号：JPH03278183A
公开(公告)日：1991-12-09
申请号：JP7674390
申请日：1990-03-28
申请人： HITACHI LTD
发明人： YAMASHITA JUNICHI , SONEDA HIDEO , SUGAWARA SATOSHI
IPC分类号： G01D7/00 , G01D21/00 , G06F3/048 , G06T11/20
摘要： PURPOSE:To display the distribution of a three-dimensional physical quantity in such form that it is easily sensuously recognized by dividing the range of the physical quantity to plural small ranges and obtaining and displaying the distribution of the space position where the physical quantity takes the value in each small range and successively changing the small range to repeat this operation. CONSTITUTION:A work station consists of a keyboard 14, a display device 15, and a data processing part 13. Data of the physical quantity as the processing object is transferred from a data file 21 to the data processing part 13 through a cable 12 or data in the data file 21 is temporarily copied on a data recording medium 16 like a magnetic tape or a floppy disk and is set to the data processing part 13. A user inputs information of an initial value of a physical quantity phi to be displayed, a display time DELTAt, etc., from the keyboard 14, and this information is subjected to prescribed display processing in the data processing part 13 to display a picture on the display device 15. Thus, such three-dimensional distribution is displayed that it can be quickly and intuitively recognized easily.

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