Control Programs Patents (Class 376/217)
  • Patent number: 10216179
    Abstract: A monitoring control system includes: a safety control device that includes a state monitoring unit that monitors a state of a plant after emergency shut-down of the plant, and a work progress monitoring unit that monitors a work progress after the emergency shut-down of the plant; and a display device that displays, in a case where the emergency shut-down of the plant is performed by the safety control device, an emergency shut-down screen including a monitoring result of the state monitoring unit and a monitoring result of the work progress monitoring unit.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: February 26, 2019
    Assignee: Yokogawa Electric Corporation
    Inventors: Yuta Machida, Makoto Nakaya, Hiromi Amii, Naoto Takano, Yuya Iketsuki
  • Patent number: 10198536
    Abstract: A simulation system in particular for a control system which controls a process running in a technical system is provided. The control system has at least one first process environment embodied as a container and which is also designed to simulate the automatic process to be run in the system and includes corresponding interfaces to the guidance system. The simulation system includes, in addition to the first process environment, a second process environment embodied as a container for simulating the hardware of the periphery of the guidance system and a third process environment embodied as a container for simulating the process to be run in the technical system. In another embodiment, all process environments can also be combined to form one process environment. In both variations, the interfaces of the first process environment and the interfaces of the second process environment are practically identical to the interfaces of the third process environment.
    Type: Grant
    Filed: June 5, 2012
    Date of Patent: February 5, 2019
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Andreas Rathgeb, Rainer Speh, Michael Unkelbach
  • Patent number: 9947422
    Abstract: This invention relates to a control method for a pressurized water nuclear reactor, which comprises a core generating thermal power and means of acquiring magnitudes representative of core operating conditions. The method comprises a step to regulate the temperature of the primary coolant, if the temperature of the primary coolant for a given thermal power is outside a predefined set temperature interval (?TREF) depending on the reactor power. The set temperature interval (?TREF) is characterized by variable amplitude (?T) on a thermal power range between N % and 100% nominal power, where N is between 0 and 100 and comprises a zero amplitude at 100% nominal power, a zero amplitude at N % nominal power.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: April 17, 2018
    Assignee: AREVA NP
    Inventors: Jennifer Martin, Jean Lucien Mourlevat, Alain Grossetete, Pierre Barthelet
  • Patent number: 9941027
    Abstract: The invention relates to a method for producing a radioisotope, which method comprises irradiating a volume of radioisotope-precursor fluid contained in a sealed cell of a target using a beam of particles of a given current, which beam is produced by a particle accelerator. The target is cooled and the internal pressure in the sealed cell is measured. During the irradiation, the internal pressure (P) in the sealed cell is allowed to vary freely. The irradiation is interrupted or its intensity is reduced when the internal pressure (P) in the sealed cell departs from a first tolerated range defined depending on various parameters that influence the variation in the internal pressure in the sealed cell during the irradiation. These parameters for example comprise, for a given target, particle beam and radioisotope-precursor fluid: the degree of filling of the hermetic cell, the cooling power used to cool the given target, and the beam current (I).
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: April 10, 2018
    Assignee: ION BEAM APPLICATIONS S.A.
    Inventors: Eric Kral, Xavier Wilputte, Michel Ghyoot, Jean-Michel Geets
  • Patent number: 9785126
    Abstract: The present disclosure describes system and methods for inferring energy usage at multiple levels of granularity. One embodiment describes an industrial automation system including a first industrial automation component, a first sensor coupled to the first industrial automation component, in which the first sensor measures a first amount of power supplied to the first industrial automation component, a second industrial automation component that couples to the first industrial automation component, and an industrial control system that infers energy usage by the first industrial automation component and the second industrial automation component based at least in part on the first amount of power supplied to the first industrial automation component.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: October 10, 2017
    Assignee: Rockwell Automation Technologies, Inc.
    Inventor: Philip John Kaufman
  • Patent number: 9640284
    Abstract: A controller for producing a nuclear reactor shutdown system trip signal in response to at least one detector signal. The controller includes a signal conditioning module receiving the at least one detector signal and outputting a measured flux signal. A rate module generates a rate signal from the measured flux signal. A comparator circuit compares the rate signal to a trip setpoint and generates a first trip signal.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: May 2, 2017
    Assignee: Atomic Energy of Canada Limited
    Inventor: Majid Borairi
  • Patent number: 9633752
    Abstract: A controller for producing a nuclear reactor shutdown system trip signal in response to at least one detector signal. The controller includes a signal conditioning module receiving the at least one detector signal and outputting a measured flux signal. A rate module generates a rate signal from the measured flux signal. A comparator circuit compares the rate signal to a trip setpoint and generates a first trip signal.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: April 25, 2017
    Assignee: Atomic Energy of Canada Limited
    Inventor: Majid Borairi
  • Patent number: 9627877
    Abstract: A nuclear power control system includes: a safety protection apparatus which outputs a first safety mode operating signal while outputting a first unsafety mode operating signal; a CCF apparatus that outputs a second safety mode operating signal; and a signal input/output circuit that is connected to the safety protection apparatus and the CCF apparatus. The signal input/output circuit includes an OR circuit that outputs a third safety mode operating signal based on the presence or absence of an input of the first safety mode operating signal and the second safety mode operating signal; a NOT circuit that is connected to the output side of the OR circuit; and an AND circuit that outputs a third unsafety mode operating signal, and the presence and absence of an input of a first unsafety mode operating signal.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: April 18, 2017
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Hiroshi Fujimoto, Hironobu Shinohara, Yasutake Akizuki, Toshiki Fukui, Yuichi Tanaka, Shinji Kiuchi, Hiroshi Shirasawa
  • Patent number: 9368239
    Abstract: The ex-core nuclear instrumentation system includes a key hole, and it is configured such that in the state where a key lock switch is inserted into the key hole, writing to a electrically rewritable nonvolatile memory is made valid by a general-purpose logic, and when writing to a electrically rewritable nonvolatile memory is in valid and the operation panel and the FPGA perform a serial communication and in a case where the data order of the serial communication is the predetermined data order, the CPU controls the electrically rewritable nonvolatile memory, and rewriting data, which is outputted from the operation panel, to the electrically rewritable nonvolatile memory is transmitted from the FPGA to the electrically rewritable nonvolatile memory so as to rewrite the data in the electrically rewritable nonvolatile memory.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: June 14, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Tomoyoshi Nagae
  • Patent number: 9147018
    Abstract: A control system for monitoring a pressure vessel includes a pressure sensor coupled to a first pressure vessel component. The system also includes a level sensor coupled to a second pressure vessel component. The system additionally includes at least one computing device including at least one input channel configured to receive data from the pressure sensor and the level sensor and a processor coupled to the at least one input channel. The processor is programmed to populate a level and pressure dynamics model associated with the pressure vessel with data received from the pressure sensor and the level sensor, the processor further programmed to be capable of controlling operation of the pressure vessel based on the level and pressure dynamics model.
    Type: Grant
    Filed: January 10, 2013
    Date of Patent: September 29, 2015
    Assignee: General Electric Company
    Inventors: Sidharth Abrol, Maria Cecilia Mazzaro
  • Patent number: 9020090
    Abstract: This document's object is to provide an axial power distribution control method in which only the control of an axial power distribution in a nuclear reactor with a simple operation with a clear operational target keeps the control of a xenon oscillation, thereby suppressing the xenon oscillation to an extremely small magnitude in advance at the same time.
    Type: Grant
    Filed: August 19, 2008
    Date of Patent: April 28, 2015
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventor: Yoichiro Shimazu
  • Patent number: 8995601
    Abstract: An axial power distribution control device includes an axial offset calculation unit 52, a parameter calculation unit 53, and an axial offset determining unit 55. The axial offset determining unit 55 predicts whether a core axial offset of the power distribution is increased or decreased after a current time, based on a major axis of an ellipse drawn by the xenon parameter and the iodine parameter calculated by the parameter calculation unit 53 and the xenon parameter and the iodine parameter at the current time. This makes it possible to predict a change of the axial offset of the power distribution of a reactor for suppressing a xenon oscillation in the reactor.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: March 31, 2015
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Masayuki Kauchi, Masatoshi Nagai
  • Publication number: 20150049851
    Abstract: A central control device of a nuclear power plant monitors and controls the nuclear power plant. The central control device includes monitoring operation devices (for example, an alarm VDU, a common system VDU, and a safety system VDU of an operation console) each having both a function as a display unit that displays information on the nuclear power plant (for example, operation information, safety information, and the like) and a function as an operation unit that operates the nuclear power plant, and a control unit that controls these monitoring operation devices. The control unit selects an operation procedure document corresponding to an input operation to a monitoring operation device and displays the operation procedure document on the monitoring operation device.
    Type: Application
    Filed: March 18, 2013
    Publication date: February 19, 2015
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventor: Masanori Yokoyama
  • Patent number: 8792604
    Abstract: To predict xenon oscillation at the present time and later. For this purpose, as an axial offset of a power distribution of a reactor is represented by AOp, an axial offset of a power distribution based on xenon distribution is represented by AOx, and an axial offset of a power distribution based on an iodine distribution is represented by AOi, a parameter DAOpx(=AOp?AOx) and a parameter DAOix(=AOi?AOx) are described by a relational expression of a trigonometric function and an exponential function using an angular frequency of xenon oscillation. Next, phases with respect to initial values of the parameters DAOpx and DAOix are obtained (Step S101). The parameter DAOpx and the parameter DAOix expressed by the obtained phase and a coefficient of the relational expression obtained from this phase are plotted on an X coordinate and a Y coordinate, respectively.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: July 29, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventor: Yoichiro Shimazu
  • Patent number: 8755481
    Abstract: A computer implemented method for modelizing a nuclear reactor core, including the steps of: partitioning the core in cubes to constitute nodes of a grid for computer implemented calculation, calculating neutron flux by using an iterative solving procedure of at least one eigensystem, the components of an iterant of the eigensystem corresponding either to a neutron flux, to a neutron outcurrent or to a neutron incurrent, for a respective cube to be calculated. A control parameter is varied to impact a neutron eigenvalue ? through a perturbed interface current equation and drive the neutron eigenvalue ? towards 1.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: June 17, 2014
    Assignee: Areva NP
    Inventor: Rene Van Geemert
  • Patent number: 8699653
    Abstract: A control strategy for a pressurized water nuclear reactor that employs separate, independent control rod banks for respectively controlling Tavg and axial offset within corresponding deadbands. The strategy does not permit the control banks controlling reactor core power and the control banks controlling axial offset to move together, but normally gives preference to the control banks controlling the Tavg except when a demand signal is received simultaneously by both independent control rod banks to move in a same direction, in which case, the control bank compensating for the axial offset is given preference.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: April 15, 2014
    Assignee: Westinghouse Electric Company, LLC
    Inventors: Keith J. Drudy, Norman P. Mueller, Elijah A. Richter
  • Patent number: 8654916
    Abstract: The invention relates to a method for regulation of operational parameters of the core of a pressurised water nuclear reactor comprising: a step of acquisition of values (FH, FB, TBC, TBF, Q) which are representative of the conditions of operating of the core of the reactor; a step of evaluation of the actual values (Tmoye, AOe, {circumflex over (P)} maxe) of the operational parameters at least according to the values acquired (FH, FB, TBC, TBF, Q); a step of selection of a control law for the concentration of a neutron-absorbent component ([B]) and for the positions of insertion (Z1 to Z5) of the groups (P1 to P5) of rods selected from at least the first and second control laws which are different from one another; and a step of regulation of the operational parameters by means of the control law selected, according to set points (Tmoyc, AOc, {circumflex over (P)} maxc) relative to the said parameters and to the actual values (Tmoye, AOe, {circumflex over (P)} maxe) evaluated.
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: February 18, 2014
    Assignee: Areva NP
    Inventor: Alain Grossetete
  • Publication number: 20130294562
    Abstract: A controller for producing a nuclear reactor shutdown system trip signal in response to at least one detector signal. The controller includes a signal conditioning module receiving the at least one detector signal and outputting a measured flux signal. A rate module generates a rate signal from the measured flux signal. A comparator circuit compares the rate signal to a trip setpoint and generates a first trip signal.
    Type: Application
    Filed: March 14, 2013
    Publication date: November 7, 2013
    Applicant: Atomic Energy of Canada Limited
    Inventor: Majid Borairi
  • Publication number: 20130294561
    Abstract: A controller for producing a nuclear reactor shutdown system trip signal in response to at least one detector signal. The controller includes a signal conditioning module receiving the at least one detector signal and outputting a measured flux signal. A rate module generates a rate signal from the measured flux signal. A comparator circuit compares the rate signal to a trip setpoint and generates a first trip signal.
    Type: Application
    Filed: March 14, 2013
    Publication date: November 7, 2013
    Applicant: ATOMIC ENERGY OF CANADA LIMITED
    Inventor: Majid Borairi
  • Patent number: 8553829
    Abstract: The invention is principally directed to a reduced order model, XEDOR, facilitating the prediction of and the diagnostics of pellet-clad interaction stress-corrosion-cracking failure of nuclear fuel rods. The invention more particularly relates to assessment of susceptibility to PCI failure for guidance in the design of fuel loading in nuclear reactors. The invention additionally relates to the protection against PCI failure by providing operational information to operators of a nuclear reactor during power maneuvering, including predictive calculations prior to executing power maneuvers. Additionally, the invention relates to the diagnostics of an event suggesting a possible PCI cladding failure.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: October 8, 2013
    Assignee: Areva NP SAS
    Inventor: Yousef Farawila
  • Patent number: 8526562
    Abstract: In the present invention, a reactor power control apparatus of a natural circulation reactor comprises a power control apparatus for controlling reactor power and a pressure control apparatus for controlling reactor pressure. A power adjustment demand signal S4 is input from the power control apparatus into the pressure control apparatus. The pressure control apparatus controls degree of opening of a inlet port steam control valve provided in a moisture separation heater that is connected to a low-pressure turbine, based on the power adjustment demand signal S4. A reactor power control apparatus of the natural circulation reactor can suppress reactor power variation and obtain stable power.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: September 3, 2013
    Assignee: Hitachi-GE Nuclear Energy, Ltd.
    Inventors: Kimiko Isono, Shin Hasegawa
  • Publication number: 20130208844
    Abstract: Provide the technique for controlling nuclear power plant in which the thermal limit can be brought close to the full limit of operation restrictions by the automatic control, using the simple information outputted shorter cycle than that of the thermal limit.
    Type: Application
    Filed: May 26, 2011
    Publication date: August 15, 2013
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tsuyoshi Masugi, Kiyoteru Suzuki, Surman Yoshinaga, Atsuhiko Koizumi
  • Publication number: 20130188765
    Abstract: According to one embodiment of a reactor core monitoring system, includes: an information retention portion for retaining a regular cycle and a short cycle as calculation information of reactor core performance data; a signal processing portion for creating heat balance data based on a process signal; a data acquisition portion for acquiring, in a timing of the regular cycle, the heat balance data and reactor core performance data which was calculated in a previous timing of the regular cycle, while acquiring, in a timing of the short cycle asynchronous to the regular cycle, the heat balance data and reactor core performance data which was calculated most recently; and a data calculation portion for calculating new reactor core performance data based on the acquired reactor core performance data and the heat balance data.
    Type: Application
    Filed: July 24, 2012
    Publication date: July 25, 2013
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Motoko YOSHIDA, Atsuhiko KOIZUMI, Masayuki OKADA
  • Publication number: 20130182809
    Abstract: A nuclear power plant control system (3) is provided with detection units (30a to 30d) which detect phenomena that occurs in a nuclear power plant for each of four systems, a trip control device (20) which starts, in the case where a signal that indicates an occurrence of the phenomenon is input from at least a predetermined number of signal lines out of signal lines of two systems, processing corresponding to the phenomenon, and majority circuits (50a and 50b) which are provided for each signal line of the two systems and each output, in the case where the phenomenon is detected by N or more detection units out of the detection units (30a to 30d), a signal that indicates an occurrence of the phenomenon to a corresponding signal line.
    Type: Application
    Filed: September 29, 2011
    Publication date: July 18, 2013
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventor: Hiroshi Fujimoto
  • Publication number: 20130163709
    Abstract: An operation monitoring apparatus is provided with a function integration VDU (21) including a normal use system VDU (32) which operates and monitors a nuclear power plant under a normal state, and a safety protection system VDU (31) which shuts down the nuclear power plant under an abnormal state, and also a safety protection system VDU (22) which shuts down the nuclear power plant under the abnormal state, and further, a block device which inhibits an actuation of the safety protection system VDU (31) when the function integration VDU (21) is under an abnormal state, thereby capable of simplifying an operation manipulation in the nuclear power plant, and ensuring a high level of safety of an operation control.
    Type: Application
    Filed: September 14, 2011
    Publication date: June 27, 2013
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Hiroshi Fujimoto, Hironobu Shinohara, Yasutake Akizuki, Toshiki Fukui, Yuichi Tanaka, Shinji Kiuchi, Hiroshi Shirasawa
  • Patent number: 8467491
    Abstract: The feedwater controller of a nuclear power plant having three or more feedwater pumps supplying water to the reactor vessel, electric motors driving the feedwater pumps and electric power converters connected to the electric motors is equipped with a flow rate controller and a trip compensation means. The flow rate controller calculates a flow rate to the reactor vessel based on a detected value indicating a condition of the nuclear power plant and a preset value of the water level of the reactor vessel, and generates a rotation speed command signal for the electric motors based on the flow rate command signal. The trip compensation means increases the rotation speed of the electric motors not having tripped if one of the feedwater pumps trips.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: June 18, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Shinya Tominaga
  • Publication number: 20130148771
    Abstract: A mixing system including: a backup heater which increases an internal pressure of a pressurizer; a spray valve which decreases the internal pressure of the pressurizer; a pressure sensor which detects the pressure inside the pressurizer; and a pressure control unit which performs a feedback control on a spray valve so that the pressure becomes a target pressure based on a detection pressure value detected by the pressure sensor, wherein the pressure control unit includes a PID control unit which performs a feedback control when heating the coolant by the backup heater and outputs a pressure controller signal and a bias setting unit which sets a bias toward the operation side of the spray valve with respect to the pressure controller signal, and wherein the spray valve is operated based on the pressure controller signal subjected to the setting of the bias.
    Type: Application
    Filed: August 9, 2011
    Publication date: June 13, 2013
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Tetsuo Saguchi, Shuhei Miyake, Akihiro Tani
  • Publication number: 20130136222
    Abstract: In a control system for a plant controlling a plant such as a nuclear power plant 1 with use of a plurality of digital control devices 41, the plurality of digital control devices 41 include a plurality of control functions 46 to 56, and the plurality of control functions 46 to 56 are provided in the plurality of digital control devices 41 in a distributed manner so that the digital control devices 41 may not fall below safety standards preset by safety analyses. This provides a control system for a plant using the plurality of digital control devices 41 and configured to control a plant safely even when a digital control device is failed.
    Type: Application
    Filed: August 2, 2011
    Publication date: May 30, 2013
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Tetsuro Nagai, Hidekazu Satake
  • Patent number: 8451100
    Abstract: Described is the use of a transponder in a commercial installation, particularly a power plant, which allows problems and dangerous situations existing in this context to be avoided and the attainable occupational safety in a commercial installation, particularly a power plant, to be increased. The transponder includes a reception element, a transmission element, a visual display unit and a memory element and also a control element which is operatively connected to these, in a commercial installation, particularly a power plant, in an arrangement or positioning on or in proximity to a component or at a switching or measuring point associated with the component for the purpose of visually displaying an operating state for the component or the switching or measuring point associated therewith using the visual display unit of the transponder.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: May 28, 2013
    Assignee: STEAG Energy Services GmbH
    Inventors: Wolfgang Offermann, Martin Stephan
  • Publication number: 20130129028
    Abstract: Provided are a safety protection system facility 43 outputting a normal actuating signal Si in a case where the safety protection system facility 43 controls actuation of a unit provided in a nuclear facility to a safe side based on an abnormality detecting signal output at the time of occurrence of an abnormality in the nuclear facility, and where this causes the unit to be actuated normally, and a CCF countermeasure facility 44 outputting a CCF-case actuating signal S2 actuating the unit to a safe side in a case where the CCF countermeasure facility 44 determines from output results of the abnormality detecting signal and the normal actuating signal S1 that the unit is not actuated normally at the time of occurrence of the abnormality in the nuclear facility.
    Type: Application
    Filed: August 2, 2011
    Publication date: May 23, 2013
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Masafumi Utsumi, Hidekazu Satake, Masaru Shimizu
  • Publication number: 20130114776
    Abstract: A generator is installed on and provides electrical power from a turbine by converting the turbine's mechanical energy to electricity. The generated electrical power is used to power controls of the turbine so that the turbine can remain in use through its own energy. The turbine can be a safety-related turbine in a nuclear power plant, such that, through the generator, loss of plant power will not result in loss of use of the turbine and safety-related functions powered by the same. Appropriate circuitry and electrical connections condition the generator to work in tandem with any other power sources present, while providing electrical power with properties required to safely power the controls.
    Type: Application
    Filed: November 4, 2011
    Publication date: May 9, 2013
    Inventors: Arthur M THINGULDSTAD, Mark A. Bergman
  • Patent number: 8433029
    Abstract: In one embodiment, the method includes determining the safety limit minimum critical power ratio using the operating limit minimum critical power ratio, a change-in-critical-power-ratio distribution bias and a change-in-critical-power-ratio distribution standard deviation.
    Type: Grant
    Filed: December 14, 2007
    Date of Patent: April 30, 2013
    Assignee: Global Nuclear Fuel—Americas, LLC
    Inventor: James Edward Fawks, Jr.
  • Publication number: 20130016802
    Abstract: An oscillation power range monitor has: an averaging section that assigns a plurality of LPRM readings input filtered to remove noise thereof from local power range monitors to calculate cell average value of the LPRM readings assigned to each cell; a time average processing section that calculates a cell time average value from the average value of each cell; a normalized cell value computing section that computes the normalized cell value for each cell from the cell time average value and the cell average value; a trip determining section that receives the normalized cell value, monitors oscillations of each cell output and outputs a scram trip when the normalized cell value exceeds a predetermined value; and an abnormality determining section that assigns a plurality of LPRM readings input and determines abnormality of each LPRM reading assigned to each cell based on the oscillations of the LPRM reading.
    Type: Application
    Filed: January 20, 2012
    Publication date: January 17, 2013
    Inventors: Takayoshi FURUSAWA, Norihiro Umemura, Tadashi Miyazaki
  • Publication number: 20120189087
    Abstract: An oscillation power range monitor has: an input signal processing section that calculates a normalized cell value from LPRM signals input from local power range monitors; a soundness checking basic signal generating section that generates a simulated cell value that is variable on a time series basis; and a trip determining section that receives the normalized cell value and the simulated cell value respectively from the input signal processing section and the soundness checking basic signal generating section as input, compares the normalized cell value and the simulated cell value with a determination threshold value and outputs a scram trip signal when either of them exceeds the determination threshold value.
    Type: Application
    Filed: January 20, 2012
    Publication date: July 26, 2012
    Inventors: Masahiro Hashiba, Tadashi Miyazaki, Norihiro Umemura, Yuta Sakai
  • Patent number: 8204631
    Abstract: Discussed is a method and device for increasing the operational flexibility of a current-generating system with a turboset, comprising a turbine coupled to an electrical generator, a power set point value being predefined, and a future target time at which the turboset is supposed to be at the power set point value, so that a power curve is determined via the power set point value and the target time, the turboset being operated starting from a actual power value at an actual time along the power curve such that the predefined power set point value is reached at the predefined target time. Also discussed is a gas turbine and to a steam turbine in accordance with the above description.
    Type: Grant
    Filed: August 1, 2006
    Date of Patent: June 19, 2012
    Assignee: Siemens Aktiengesellschaft
    Inventors: Günther Ebner, Tobias Herzog
  • Patent number: 8135106
    Abstract: The present invention provides a method of operating a Boiling Water Reactor, having the steps of analyzing LPRM signals for oscilliatory behavior indicative of neutron-flux-coupled density wave oscillations, determining if oscilliatory behavior is present in the signals; initiating a reactor protective corrective action if the oscilliatory behavior is determined, and in addition, initiating corrective actions if neutron uncoupled oscillations are possible. Detecting the later is performed through analytically determined exclusion zone on the power flow map or by on-line stability calculations for several high power channels.
    Type: Grant
    Filed: April 18, 2005
    Date of Patent: March 13, 2012
    Assignee: Areva NP Inc.
    Inventors: Yousef M. Farawila, Douglas W. Pruitt
  • Publication number: 20110311013
    Abstract: A system and apparatus for monitoring and control of the operation of various types of industrial plants, including power plants, nuclear power plants and plants including various types of mechanical, electrical and chemical machinery. The invention employs modular non-microprocessor based, non-software based digital hardware that enables communication between sensors and control logic and between the control logic and actuators that control a functional aspect of each plant.
    Type: Application
    Filed: June 21, 2011
    Publication date: December 22, 2011
    Applicant: Lockheed Martin Corporation
    Inventors: Richard A. Cobley, Joseph G. Murray
  • Publication number: 20110299646
    Abstract: A system for supporting nuclear power plant operation includes an event data base that stores events corresponding to behaviors of the plant data. A countermeasure operation database stores operations corresponding to the events. An operation procedure database stores operation procedures that are required for the corresponding operations. An event discriminating section retrieves an event that occurs in a nuclear power plant from an event database so as to discriminate based on a behavior of plant data that is captured from the plant interface. A countermeasure retrieval section retrieves a countermeasure operation from the countermeasure operation database based on an event that is discriminated by the event discriminating section. A display control section displays an operation procedure that is required for performing the countermeasure operation on a display device.
    Type: Application
    Filed: April 14, 2011
    Publication date: December 8, 2011
    Applicant: Mitsubishi Electric Corporation
    Inventor: Masashi HIRAHATAKE
  • Publication number: 20110200155
    Abstract: In order to stably control a nuclear reactor in a short time, so as not to enter an unstable region that is determined by the relationship between the reactor pressure, the reactor power and the subcooling of the core inlet coolant at start-up time, the nuclear reactor system comprises: an power control apparatus for generating a control rod operation signal for operating a control rod, based on the reactor water temperature change rate; a feed water control apparatus for generating a feed water flow rate signal and a discharge water flow rate signals based on the reactor water level signal; and a process computer for performing overall control of the power control apparatus and the feed water control apparatus, wherein the feed water control apparatus has the reactor water temperature change rate setting section for adjusting the reactor water temperature change rate set value based on the variation of the reactor water level signal.
    Type: Application
    Filed: January 13, 2011
    Publication date: August 18, 2011
    Inventors: Atsushi Fushimi, Setsuo Arita, Yoshihiko Ishii, Tomohiko Ikegawa, Shin Hasegawa, Kazuhiko Ishii
  • Patent number: 7996194
    Abstract: A modeling process includes providing blocks, each of the blocks representing functional entities that operate on input signal values, output signal values from the blocks, grouping the output signal values as an ordered set in a multiplexer as a first composite signal and outputting the first composite signal.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: August 9, 2011
    Assignee: The MathWorks, Inc.
    Inventors: Mojdeh Shakeri, Marc Ullman, Ramamurthy Mani
  • Patent number: 7894943
    Abstract: A building heating/cooling system energy optimization method for a building having a heating/cooling system includes the steps of providing a mathematical model of the heating/cooling system, obtaining real-time weather information, reading the input water temperature (IWT), the output water temperature (OWT) and the supply air temperature (SA) output to the building, periodically transferring the IWT, the OWT and the SA to an optimization system which is operative to analyze the real-time data in coordination with the mathematical model by assigning at least three selected values in a range surrounding and including the current values of each of the IWT, the OWT and the SA and calculating the efficiency profile of the components of the heating/cooling system for each of the selected values, then cooperatively optimizing and selecting those values calculated to provide the highest efficiency profile, then periodically resetting the system values to those selected by the optimization system.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: February 22, 2011
    Inventors: Charles J. Sloup, Daniel Karnes, Gregor P. Henze
  • Publication number: 20100272223
    Abstract: In order to stably control a nuclear reactor in a short time, so as not to enter an unstable region that is determined by the relationship between the reactor pressure, the reactor power and the subcooling of the core inlet coolant at start-up time, the nuclear reactor system comprises: an power control apparatus for generating a control rod operation signal for operating a control rod, based on the reactor water temperature change rate; a feed water control apparatus for generating a feed water flow rate signal and a discharge water flow rate signals based on the reactor water level signal; and a process computer for performing overall control of the power control apparatus and the feed water control apparatus, wherein the feed water control apparatus has the reactor water temperature change rate setting section for adjusting the reactor water temperature change rate set value based on the variation of the reactor water level signal.
    Type: Application
    Filed: January 25, 2007
    Publication date: October 28, 2010
    Inventors: Atsushi Fushimi, Setsuo Arita, Yoshihiko Ishii, Tomohiko Ikegawa, Shin Hasegawa, Kazuhiko Ishii
  • Publication number: 20100091928
    Abstract: A protection system for a nuclear boiling water reactor may include a device configured to monitor reactor power; a device configured to monitor reactor pressure; a device configured to determine a power-dependent high reactor pressure setpoint, based on the monitored reactor power; and a device configured to initiate a protection system action when the monitored reactor pressure is greater than the power-dependent high reactor pressure setpoint. The power-dependent high reactor pressure setpoint that corresponds to at least one value of percent power in an operating domain of the reactor may be less than the power-dependent high reactor pressure setpoint that corresponds to 100% reactor power.
    Type: Application
    Filed: December 14, 2009
    Publication date: April 15, 2010
    Inventor: Randall Howard Jacobs
  • Publication number: 20100080334
    Abstract: Provided are a method and apparatus for validating dynamic performance of a control system of a nuclear power plant in operation, without performing a power ascension test. According to the present invention, when the performance of the control system requires to be validated in order to change a control logic or its setpoint of or to replace hardware of the control system, the dynamic performance of the control system may be validated without performing the power ascension test which can be performed only in a trial operation and requires large expenses. In the present invention, a design computer code capable of simulating a transient state of the nuclear power plant is connected to the hardware of the control system, and tests to be performed at the power ascension test or in the transient state of the nuclear power plant are simulated by directly using the hardware of the control system instead of a control system model of the design computer code, in an on-line state.
    Type: Application
    Filed: October 14, 2008
    Publication date: April 1, 2010
    Applicant: KOREA POWER ENGINEERING COMPANY, INC.
    Inventors: Suk Whun SOHN, In Ho SONG, See Chae JEONG, Ung Soo KIM, Myung Jun SONG, Jong Joo SOHN, Eun Kee KIM
  • Patent number: 7620139
    Abstract: In the method, performance of a nuclear reactor may be improved by implementing an operational solution for the nuclear reactor using at least one control rod criteria in order to increase scram effectiveness during at least a portion of an operating cycle for the nuclear reactor.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: November 17, 2009
    Assignee: Global Nuclear Fuel - Americas, LLC
    Inventors: Francis Bolger, Jose Casillas
  • Publication number: 20090080585
    Abstract: The invention is principally directed to a reduced order model, XEDOR, facilitating the prediction of and the diagnostics of pellet-clad interaction stress-corrosion-cracking failure of nuclear fuel rods. The invention more particularly relates to assessment of susceptibility to PCI failure for guidance in the design of fuel loading in nuclear reactors. The invention additionally relates to the protection against PCI failure by providing operational information to operators of a nuclear reactor during power maneuvering, including predictive calculations prior to executing power maneuvers. Additionally, the invention relates to the diagnostics of an event suggesting a possible PCI cladding failure.
    Type: Application
    Filed: September 26, 2007
    Publication date: March 26, 2009
    Inventor: Yousef Farawila
  • Publication number: 20080123794
    Abstract: Systems and methods for a method for determining a critical effective k at an off-rated core state of a nuclear power plant includes determining, for the off-rated core state a control rod density, a percent core power, a gadolinium reactivity worth, a doppler reactivity worth, and a xenon reactivity worth responsive to a control rod pattern, a reactor power plan including the off-rated core state, and a reference effective k, calculating a change in an effective k from the reference effective k at the off-rated core state responsive to two or more parameters selected from the group consisting of the control rod density, the percent core power, the gadolinium reactivity worth, the doppler reactivity worth, and the xenon reactivity worth, and generating the critical effective k for the off-rated core state responsive to the change in the effective k from the reference effective k.
    Type: Application
    Filed: November 29, 2006
    Publication date: May 29, 2008
    Inventors: Ugur Mertyurek, David Joseph Kropaczek, Atul A. Karve, Angelo P. Chopelas
  • Patent number: 7222058
    Abstract: A method of modeling a heat exchanger is disclosed and comprises assigning input temperatures, assumed output temperatures, and a set of flow rates, inputting the parameters into a set of equations arranged to calculate a heat transfer coefficient, inputting parameters into a second set of equations arranged to calculate output temperatures, substituting actual output temperatures for the assumed output temperatures, and again calculating the heat transfer cooefficient. The new heat transfer coefficient is then used to obtain revised actual output temperatures, and the initial actual output temperatures and the revised actual output temperatures are compared to determine whether they differ by less than a desired variance. If not, a new iteration is performed until the output temperatures converge.
    Type: Grant
    Filed: October 28, 2002
    Date of Patent: May 22, 2007
    Assignee: Fisher-Rosemount Systems, Inc.
    Inventor: John P. Miller
  • Patent number: 6928132
    Abstract: A method for operating a system having a plurality of modes and interlocks between the modes is provided. The method includes operating the system in a first mode and switching the system to a second mode without going to a standby mode.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: August 9, 2005
    Assignee: General Electric Company
    Inventor: Robert W. Droege
  • Patent number: 6873671
    Abstract: In a boiling water reactor controlling each control rod hydraulically by driving a solenoid valve, the control system comprises an operation control means 41 having a duplicated data processing unit for generating sequence patterns based on the timing of the driving sequence based on the control information provided manually, a transmission control means 42 for creating a command word corresponding to each control rod being controlled based on said sequence pattern, and mutually communicating each command word between duplicated data processing units and computing the AND logic of said data within a predetermined time difference, and when the computed result coincide, transmitting the selected command word serially; a transmission unit 32 for receiving said command word and performing protocol conversion thereto, and transmitting the same to a plurality of transmission branch units positioned downstream as the control command; and a solenoid valve drive circuit 31 for driving the control rod drive unit corres
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: March 29, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiko Ishii, Shigeru Udono, Koji Masui, Masahiro Matsuda