CN103513621A - Method for analyzing technological parameter default value of digital control system of nuclear power plant - Google Patents
Method for analyzing technological parameter default value of digital control system of nuclear power plant Download PDFInfo
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- CN103513621A CN103513621A CN201210218973.3A CN201210218973A CN103513621A CN 103513621 A CN103513621 A CN 103513621A CN 201210218973 A CN201210218973 A CN 201210218973A CN 103513621 A CN103513621 A CN 103513621A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention belongs to the nuclear power plant design technology, and particularly relates to a method for analyzing a technological parameter default value of a digital control system of a nuclear power plant. The method comprises the steps that firstly, a signal transmission mode and a signal fault finding mechanism of the digital control system are analyzed, and the analysis range of a technological parameter default value signal is determined in cooperation with signal unavailability management of the digital control system; secondly, a unified default value signal screening method is determined; finally, default value evaluation analysis is conducted, comprehensive assessment is conducted, and the default value is determined. On the basis of the function and the requirement of a digital instrument control system, the control design is supplemented and completed, and the safety and the availability of the nuclear power plant are further improved.
Description
Technical field
The invention belongs to design of nuclear power plant technology, be specifically related to the technological parameter default value analytical approach of a kind of nuclear power plant Digitizing And Control Unit.
Background technology
Nuclear power plant's Instrumentation and Control system is that each composition system of important component part ，Ta Wei nuclear power plant and the process equipment of nuclear power plant provides all kinds of control, salvo and monitoring information, to guarantee that nuclear power plant can move safely, reliably and economically.
For the nuclear power plant that adopts Digitizing And Control Unit (DCS), its instrument control system has the features such as system configuration is flexible, control perfect in shape and function.Wherein, digitizing instrument control system can be carried out Configuration Design in control system, processing from dynamic response when realizing signal or system and breaking down, optimal control process.
Nuclear power plant for Applied Digital control technology; nuclear power plant's process control and protection realize by Digitizing And Control Unit; comprise the aspects such as data acquisition, data processing, logical operation, instruction output and man-machine interface, realize normal operation, depart from the monitoring that the nuclear power plant under each operating mode such as moves after normal operation and accident.Digitizing And Control Unit, when carrying out above informational function, controlling defencive function, also has other subsidiary functions, as signal fault diagnosis and processing.
As one of advanced technology feature of Digitizing And Control Unit, for data-signal fault, Digitizing And Control Unit can be surveyed in time, and in conjunction with the Configuration Design in control system--default value setting, processing from dynamic response when realizing signal or system and breaking down.The technology, based on digitizing instrument control system this new technology function and requirement, has been carried out default value and has been analyzed design studies.
Summary of the invention
The object of the invention is the requirement for Digitizing And Control Unit, the rationally analytical approach of the value of establishing of a kind of technological parameter function, default value range of signal and default value is provided, to improve security and the availability of nuclear power plant's technological process.
Technical scheme of the present invention is as follows: the technological parameter default value analytical approach of a kind of nuclear power plant Digitizing And Control Unit, comprises the steps:
(1) signal transmission form and the signal fault of analyzing Digitizing And Control Unit are surveyed mechanism;
(2), in conjunction with the management of Digitizing And Control Unit invalidating signal, determine the analyst coverage of technological parameter default value signal;
(3) determine unified default value signal screening method;
(4) carry out the analysis of default value value, and comprehensive evaluation is determined value.
Further, the technological parameter default value analytical approach of nuclear power plant as above Digitizing And Control Unit, wherein, the signal transmission form described in step (1) comprises hardwire transmission and Internet Transmission.
Further, the technological parameter default value analytical approach of nuclear power plant as above Digitizing And Control Unit, wherein, in step (2), technological parameter default value signal is determined hypothesis and the scope of application of standard, being comprised: default value signal fault is supposed single point failure conventionally; The functional analysis of each default value signal should be considered each operating condition condition that it may be suitable for.
Further, the technological parameter default value analytical approach of nuclear power plant as above Digitizing And Control Unit, wherein, the analyst coverage of the default value signal described in step (2) is the signal of hardwire transmission, comprise hardwire communication signal, hardwire sensor collection signal, signal type is divided into switching value signal and analog signals.
Further, the technological parameter default value analytical approach of nuclear power plant as above Digitizing And Control Unit, in step (2), for analog signals, default value signal fault comprises that broken string, line short, sensor transfinite, function fastener internal fault; For switching value signal, default value signal fault comprises line short, function fastener internal fault.
Further, the technological parameter default value analytical approach of nuclear power plant as above Digitizing And Control Unit, in step (3), for hardwire sensor collection signal, from logical diagram and simulation drawing, by instrument, carry out default value signal screening, for this type of signal with a plurality of threshold values or a plurality of logic functions, should determine default value signal according to signaling point.
Further, the technological parameter default value analytical approach of nuclear power plant as above Digitizing And Control Unit, in step (3), for hardwire communication signal, the form with dotted line in logical diagram represents, and signal screens one by one.
Further, the technological parameter default value analytical approach of nuclear power plant as above Digitizing And Control Unit, the default value value analysis in step (4) comprises following aspects:
1) the optional numerical value of default value value is standard;
2) security of unit and system;
3) equipment and personnel's protection;
4) availability of unit;
5) break down after personnel's possibility of intervening.
Beneficial effect of the present invention is as follows:
1, technological parameter default value is analyzed, and the default response of Digitizing And Control Unit in signal fault situation is provided, and has optimized control program, has improved security and the availability of nuclear power plant.
2, the classification of default value signal and screening, be conducive to the management of standard Digitizing And Control Unit invalidating signal.
3, the result of default value analysis can be applied to DCS power supply forfeiture analysis, rack fault analysis and the design of relevant treatment rules.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Embodiment
As shown in Figure 1, the technological parameter default value analytical approach of nuclear power plant provided by the present invention Digitizing And Control Unit, comprises the steps:
(1) signal transmission form and the signal fault of analyzing Digitizing And Control Unit are surveyed mechanism;
(2), in conjunction with the management of Digitizing And Control Unit invalidating signal, determine the analyst coverage of technological parameter default value signal; To technological parameter default value signal determine the hypothesis of standard and the scope of application as follows:
A) default value signal fault supposes that single-point (single instrument, mono signal) lost efficacy conventionally;
B) functional analysis of each default value signal should be considered each operating condition condition that it may be suitable for;
(3) determine unified default value signal screening method;
(4) according to rule, carry out the analysis of default value value, analysis should be considered following aspects, and comprehensive evaluation is determined value:
A) the optional numerical value of default value value is standard;
B) security of unit and system;
C) equipment and personnel's protection;
D) availability of unit;
E) break down after personnel's possibility of intervening.
Function and the requirement of said method based on digitizing instrument control system, carries out default value and analyzes design studies, comprises analytical approach and the application of technological parameter DCS default value, has supplemented perfect and has controlled design, thereby further improved security and the availability of nuclear power plant.
Below in conjunction with instantiation, the present invention is described in detail.
The research of nuclear power plant's Digitizing And Control Unit overall design.Digitizing And Control Unit generally comprises the non-security level platform of controlling for nuclear power plant's technological process and the safe level system driving for nuclear power plant's reactor protection and safety.For safe level DCS; due to the requirement of its safety and high reliability and the consideration that prevents mistake protection; the degeneration logic of the general many redundant signals of its instrument control scheme Design; for example; while there is signal fault; system deteriorates to " 3 get 2 " logic by " 4 get 2 " logic automatically, and " 3 get 2 " deteriorates to " 2 get 1 " etc. automatically.Therefore safe level DCS part is without carrying out default value analysis.
The research of the transmission of DCS signal and mechanism for detecting faults.The signal transmission communication mode of Digitizing And Control Unit mainly contains hardwire transmission and Internet Transmission.For network signal, while there is network communication fault, generally by thinking without effectively input after network detection identification.Therefore, default value signal analysis scope is the signal of hardwire transmission, comprises hardwire communication signal, hardwire sensor collection signal.The common trait of these two kinds of hardwire signal transmissions is to carry out I/O by input/output function fastener.Signal type is divided into switching value signal and analog signals.
Should be noted, the difference of signal type, the fault coverage that its applicable I/O function fastener can be surveyed is different, and this is relevant with the wiring between instrument and I/O function fastener.For analog signals, can survey the faults such as broken string, short circuit, sensor transfinite, function fastener internal fault.Switching value signal aspect, line short, function fastener internal fault can effectively detect.
Determining of the research of DCS invalidating signal management and technological parameter default value signal analysis scope.Digitizing And Control Unit, can general management instrument control fault and 2 layers of picture disply as a kind of omnibearing instrument control solution.Default value analysis arranges the total man-machine interface scheme of Ying Yugai nuclear power plant and combines.For example, for only, as the signal that shows or report to the police, as long as 2 layers of display frame of DCS can give fault prompting, be enough, without carrying out default value analysis setting.
Ineffectivity management refers to that DCS is to the instrument control equipment failure of DCS inside and the total a kind of processing scheme of 0 layer of equipment (referring to process equipment, instrument) fault.For example an analog quantity instrument breaks, and DCS I/O fastener can be identified, but how to process after identification, need to carry out total consideration.For example, for only sending master-control room to show the signal of reading, can consider to be shown as " * * * ", and with reading frame special color, indicate in the display frame of master-control room workstation.If sort signal has been done this processing, just needn't carry out again default value analysis, because need not establish default value.Therefore, invalidating signal management has direct relation with default value analyst coverage.The present invention provides a kind of thinking of definite default value analyst coverage in this way.
Determine and standard default value signal screening method.As described above, default value range of signal is hardwire communication signal and hardwire sensor collection signal.For hardwire sensor collection signal, can by instrument, screen from logical diagram and simulation drawing.During this type of signal screening, answer standard, some signal has a plurality of threshold values or a plurality of logic function, now should determine default value signal according to signaling point.For hardwire communication signal, there are several forms: the communication of rack room hardwire, time-critical signal, the safe level DCS rack of non-security level DCS system is sent to the signal of non-security level DCS rack, in logical diagram, this type of signal can represent with the form of dotted line, needs signal ground of a signal to screen.
Default value value is analyzed.The cvcs let down heat exchanger downstream temperature RCV002MT instrument of take is example; this sensor function is to measure let down heat exchanger downstream temperature; under output, let out temperature conditioning signal, and under let out temperature and export threshold signal when high and let out protection under participating in, close letdown valve door.First, the function that this signal participates in is all applicable in operating modes such as normal operation, accident operations, and lets out protection under all requiring to be used for.If instrument generation disconnection fault, for the high signal of temperature, when default value value is analyzed, should consider rack distribute, with another thermometric instrument RCV003MT signal and logical operation, the value of setting is only fully like this.Namely, for RCV002MT temperature high threshold signal, be switching value signal, default value value is " 1 ".Like this; single instrument fault can not interrupt normal operation; can when temperature is high really, " automatically " enable default value with protection letdown line again; both security and equipment protection (under let out protection) had been considered; consider again available rate (prevent let out under interrupting because of single instrument fault normal operation), reached optimal design effect.This relates to the analysis of the aspects such as logic, systemic-function, operation and operating mode.
When carrying out the analysis of default value value, also should consider the possibility that after breaking down, personnel intervene.For example, for some, affect the manually operated signal of master-control room operator.As for certain container, when pressure is low, think without exhaust (object of exhaust is to reduce the pressure of container, and pressure own is low, just without exhaust), the manual control of vent valve of having used blocking by low pressure in logic.When break down in pressure low signal source, the default value of this signal should be set as " non-low ", and can carry out the possibility of manual operation to operator when knowing instrument fault, while avoiding pressure measuring instruments to damage, operator's situation at one's wit's end occurs.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and within modification belongs to the scope of the claims in the present invention and equivalent technology thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (8)
- The technological parameter default value analytical approach of 1.Yi Zhong nuclear power plant Digitizing And Control Unit, comprises the steps:(1) signal transmission form and the signal fault of analyzing Digitizing And Control Unit are surveyed mechanism;(2), in conjunction with the management of Digitizing And Control Unit invalidating signal, determine the analyst coverage of technological parameter default value signal;(3) determine unified default value signal screening method;(4) carry out the analysis of default value value, and comprehensive evaluation is determined value.
- 2. the technological parameter default value analytical approach of nuclear power plant as claimed in claim 1 Digitizing And Control Unit, is characterized in that: the signal transmission form described in step (1) comprises hardwire transmission and Internet Transmission.
- 3. the technological parameter default value analytical approach of nuclear power plant as claimed in claim 1 or 2 Digitizing And Control Unit, it is characterized in that: in step (2), technological parameter default value signal is determined hypothesis and the scope of application of standard, being comprised: default value signal fault is supposed single point failure conventionally; The functional analysis of each default value signal should be considered each operating condition condition that it may be suitable for.
- 4. the technological parameter default value analytical approach of nuclear power plant as claimed in claim 3 Digitizing And Control Unit, it is characterized in that: the analyst coverage of the default value signal described in step (2) is the signal of hardwire transmission, comprise hardwire communication signal, hardwire sensor collection signal, signal type is divided into switching value signal and analog signals.
- 5. the technological parameter default value analytical approach of nuclear power plant as claimed in claim 4 Digitizing And Control Unit, it is characterized in that: in step (2), for analog signals, default value signal fault comprises that broken string, line short, sensor transfinite, function fastener internal fault; For switching value signal, default value signal fault comprises line short, function fastener internal fault.
- 6. the technological parameter default value analytical approach of nuclear power plant as claimed in claim 4 Digitizing And Control Unit, it is characterized in that: in step (3), for hardwire sensor collection signal, from logical diagram and simulation drawing, by instrument, carry out default value signal screening, for this type of signal with a plurality of threshold values or a plurality of logic functions, should determine default value signal according to signaling point.
- 7. the technological parameter default value analytical approach of nuclear power plant as claimed in claim 4 Digitizing And Control Unit, is characterized in that: in step (3), for hardwire communication signal, the form with dotted line in logical diagram represents, and signal screens one by one.
- 8. the technological parameter default value analytical approach of nuclear power plant as claimed in claim 1 Digitizing And Control Unit, is characterized in that: the default value value analysis in step (4) comprises following aspects:1) the optional numerical value of default value value is standard;2) security of unit and system;3) equipment and personnel's protection;4) availability of unit;5) break down after personnel's possibility of intervening.
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