CN109147978B - Loop loose part monitoring device and method for nuclear power unit - Google Patents
Loop loose part monitoring device and method for nuclear power unit Download PDFInfo
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- CN109147978B CN109147978B CN201810690750.4A CN201810690750A CN109147978B CN 109147978 B CN109147978 B CN 109147978B CN 201810690750 A CN201810690750 A CN 201810690750A CN 109147978 B CN109147978 B CN 109147978B
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Abstract
The invention relates to the technical field of fault monitoring of million-level nuclear power stations, and discloses a device and a method for monitoring a loose part of a loop of a nuclear power unit, wherein on the first hand, a signal acquisition unit is arranged to have the functions of continuous acquisition recording and digital conversion of a vibration signal, so that the vibration signal can be stored, and meanwhile, a user can conveniently call the digital signal at any time and perform subsequent processing on the digital signal; in the second aspect, because the monitoring unit determines the impact signal according to the digital signal, the purpose of performing time domain/frequency domain processing on the digital signal can be achieved, and the accuracy of the impact signal in determination can be increased. The monitoring device also comprises a process control unit, so that the monitoring unit can perform time synchronization comparison on the determined impact signal and a control command of the process control unit, the occurrence position of abnormal vibration can be determined according to a comparison result, the defects that the existing monitoring device is single in function and cannot perform abnormal positioning can be overcome, and convenience is brought to users.
Description
Technical Field
The invention relates to the technical field of fault monitoring of million-level nuclear power stations, in particular to a device and a method for monitoring a loose part of a loop of a nuclear power unit.
Background
Nuclear power generation is an important clean energy power generation technology, chemical energy of fossil fuel is replaced by nuclear fission energy, a boiler for thermal power generation is replaced by a nuclear reactor and a steam generator, and a steam turbine is driven by steam to generate power. Currently, a nuclear power plant mainly includes a nuclear reactor, a steam generator, a steam turbine, a generator, a power regulation control system, and other devices, wherein a circulating water system of the nuclear reactor is called a primary loop system, and is mainly used for providing a speed-regulating feed water to the nuclear reactor so as to quickly obtain heat energy from the nuclear reactor and exchange the heat energy to a circulating water system of the steam generator (i.e., a secondary loop system). Because a primary circuit system plays an important role in heat energy output, the operation state of the primary circuit system plays an important role in the speed regulation and water supply process of a nuclear reactor and the safety and stability operation process of the whole nuclear power unit, and in order to monitor the installation and fixation state of each component in the primary circuit system, the vibration condition of each component needs to be known all the time, and a primary circuit loose component monitoring system (KIR) is often adopted to complete the vibration detection and triggering alarm functions of loose components.
At present, a primary circuit loosening component monitoring system in a nuclear power unit mainly collects vibration signals of system components during operation through an acceleration probe installed on a pressure container, judges the size of the vibration signals and the time correlation among signal collection channels through a KIR cabinet to trigger generation of alarm signals, and therefore workers are guided to maintain loosening components timely to avoid further damage of a primary circuit system. However, the conventional primary loose component monitoring system only has the functions of vibration signal acquisition and alarm triggering, but does not have the functions of continuous recording of vibration signals and judgment of alarm reasons, which easily causes the embarrassment that the alarm is triggered on site and the worker cannot eliminate obstacles, and particularly during the primary neutron flux diagram measurement test (i.e. during the RPN test, the neutron detector is mainly inserted into the reactor core instrument tube to measure the neutron flux distribution of the reactor core), the primary loose component monitoring system frequently generates alarm signals, the worker cannot find the root cause of the alarm, and cannot perform corresponding analysis and judgment on the vibration signals triggering the alarm, and cannot judge abnormal sources according to signal characteristics, is not beneficial to abnormal positioning, is not beneficial to eliminating the unexpected phenomenon of false triggering, and also brings influences on normal operation and normal detection and monitoring during the test.
Disclosure of Invention
In order to solve the technical problem, the application provides a device and a method for monitoring a loose part of a loop of a nuclear power unit.
According to a first aspect, there is provided in one embodiment a loose part monitoring device for a circuit of a nuclear power generating unit, comprising:
the vibration detection unit is used for detecting a vibration signal of a loop component in the nuclear power unit;
the signal acquisition unit is in signal connection with the vibration detection unit and is used for acquiring the vibration signal and converting the vibration signal into a corresponding digital signal;
and the monitoring unit is in communication connection with the signal acquisition unit and is used for acquiring the digital signal and determining an impact signal according to the digital signal, wherein the impact signal is used for representing the occurrence state of abnormal vibration.
The loop loose part monitoring device also comprises a process control unit;
the nuclear power generating unit comprises one or more execution devices for adjusting or testing the running state of the nuclear power generating unit, and the process control unit is connected with the execution devices and used for sending a control command to the execution devices to control the execution state of the execution devices; and the monitoring unit is in communication connection with the process control unit and is used for acquiring the control command and judging the generation position of abnormal vibration according to the control command and the impact signal.
The process control unit includes a group selector, the execution device includes a plurality of neutron detectors;
the group selector is used for sending a test control command to each neutron detector and selecting one of the neutron detectors as a current neutron measurement channel; and when the monitoring unit judges that the time of the tested control command is synchronous with that of the impact signal, determining that the current neutron measurement channel generates abnormal vibration.
The vibration detection unit comprises one or more acceleration probes, and each acceleration probe is used for being arranged at multiple positions of a loop component in the nuclear power unit so as to detect vibration signals at the positions respectively.
The signal acquisition unit comprises one or more input channels, and each input channel is respectively used for being connected with each acceleration probe and respectively used for converting the received vibration signal into a corresponding digital signal.
The monitoring unit acquires the digital signal and determines an impact signal according to the digital signal, and the monitoring unit comprises: the monitoring unit acquires the digital signal; the monitoring unit carries out time domain processing and/or frequency domain processing on the digital signal to obtain a characteristic signal corresponding to the digital signal; and when one characteristic value of the characteristic signal exceeds a threshold value, determining that the signal of the position corresponding to the characteristic value on the characteristic signal is an impact signal.
The monitoring device for the loose parts of the loop further comprises an alarm unit, wherein the alarm unit is in signal connection with the monitoring unit and is used for generating an alarm message when the monitoring unit determines the impact signal.
According to a second aspect, an embodiment provides a loose part monitoring method for a circuit of a nuclear power generating unit, comprising the following steps:
acquiring a vibration signal of a loop component in a nuclear power unit;
converting the vibration signal into a corresponding digital signal;
and determining an impact signal according to the digital signal, wherein the impact signal is used for representing the occurrence state of the abnormal vibration.
The determining an impact signal from the digital signal includes:
acquiring the digital signal;
performing time domain processing and/or frequency domain processing on the digital signal to obtain a characteristic signal corresponding to the digital signal;
and when one characteristic value of the characteristic signal exceeds a threshold value, taking a signal corresponding to the characteristic value exceeding the threshold value on the characteristic signal as an impact signal.
The method for monitoring the loose parts of the loop further comprises an abnormal vibration determining step, wherein the abnormal vibration determining step comprises the following steps:
acquiring a control command for controlling an execution device in a nuclear power unit, wherein the execution device is used for adjusting or testing the running state of the nuclear power unit;
and judging the generation position of abnormal vibration according to the control command and the impact signal, and if the time of the control command is synchronous with that of the impact signal, determining that the execution equipment controlled by the control command generates abnormal vibration.
The beneficial effect of this application is:
according to the embodiment, the monitoring device comprises a vibration detection unit, a signal acquisition unit, a monitoring unit and the like, and the monitoring method comprises the steps of acquiring a vibration signal of a loop component, carrying out digital conversion on the vibration signal and determining an impact signal according to the digital signal. On the first hand, the arranged signal acquisition unit has the functions of continuous acquisition and recording of the vibration signals and digital conversion, so that the vibration signals in a long time can be stored, and meanwhile, a user can conveniently call the digital signals at any time and carry out subsequent processing on the digital signals; in the second aspect, the monitoring unit determines the impact signal according to the digital signal, so that the purpose of time domain/frequency domain processing on the digital signal can be achieved, the operations of signal peak value searching, time axis comparison, Fourier transform and the like can be quickly realized, the impact signal can be determined according to the characteristics of the digital signal in the time domain/frequency domain, and the accuracy of the impact signal in determination can be increased. In addition, the monitoring device also comprises a process control unit, so that the monitoring unit can perform time synchronization comparison on the determined impact signal and a control command of the process control unit, the occurrence position of abnormal vibration can be determined according to a comparison result, the defects that the existing monitoring device is single in function and cannot perform abnormal positioning can be overcome, and convenience is brought to users.
Drawings
FIG. 1 is a schematic structural diagram of a circuit loose part monitoring device;
FIG. 2 is a schematic structural view of another loose part monitoring device of the circuit;
FIG. 3 is a graph comparing a normal vibration signal and an impact signal in the time domain;
FIG. 4 is a graph comparing a normal vibration signal and an impact signal in the frequency domain;
FIG. 5 is a schematic flow diagram of a circuit loose part monitoring method;
FIG. 6 is a schematic flow chart of a monitoring method of the monitoring unit;
fig. 7 is a flowchart of the abnormal vibration determination step.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, the present application discloses a loose part monitoring device for a loop of a nuclear power generating unit, which includes a vibration detection unit 11, a signal acquisition unit 13 and a monitoring unit 15, which are sequentially connected in a communication manner, and are described below.
The vibration detection unit 11 is a detection component for vibration signals, and is mainly used for detecting the vibration signals of the loop component N01 in the nuclear power plant N0. In an embodiment, the vibration detecting unit 11 comprises one or more acceleration probes, each acceleration probe is used for being arranged at a plurality of positions of the loop component N01 in the nuclear power plant so as to respectively detect vibration signals of the positions. The acceleration probe herein refers to various types of vibration sensors or acceleration sensors capable of measuring a vibration amount, which generally convert a detected vibration amount into an electric charge amount for output, and then such sensors should further include a charge converter to convert the electric charge amount into a voltage signal/current signal for output, and since the acceleration probe is of the prior art, a detailed description thereof will not be given here.
It should be noted that there are many circuits in the nuclear power plant N0, such as a circulating water circuit for a nuclear reactor (commonly referred to as a primary circuit), a circulating water circuit for a steam generator (commonly referred to as a secondary circuit), a steam circuit for a steam turbine, the loops are all composed of loop parts such as pipelines, pressure vessels, circulating pumps and the like, and the loop parts generate mechanical vibration due to the flow of water or steam in the loops, the mechanical vibration is small under normal conditions and the loosening of the loop parts can not be caused, the abnormal vibration conditions such as excessive mechanical vibration and the like can cause the loosening of the loop component, and in order to avoid the condition that the loop cannot work normally caused by the loosening of the loop component, the acceleration probes are arranged at a plurality of positions of the loop component, the purpose of comprehensively monitoring the working process of the loop is achieved by detecting vibration, alarming abnormal vibration, timely eliminating faults and the like. Preferably, the vibration detection unit in this embodiment is disposed on a pressure vessel of a circuit, and detects a vibration signal on the circuit through an acceleration sensor on the pressure vessel, so as to know the operating state of the circuit at any time.
The signal acquisition unit 13 is in signal connection with the vibration detection unit 11, and is mainly used for acquiring vibration signals and converting the vibration signals into corresponding digital signals. In an embodiment, the signal acquisition unit 13 includes one or more input channels, each input channel is respectively used for connecting with each acceleration probe in the vibration detection unit 11, and is respectively used for converting the received vibration signal into a corresponding digital signal. In a specific embodiment, the SK9172 vibration monitor developed by Shanghai digital measurable and controllable equipment can be selected as a signal acquisition unit, and the SK9172 vibration monitor has high data acquisition, high digital conversion capacity and large disk storage space, can realize the acquisition effect of millisecond-level vibration signals, and can store digital signals corresponding to the vibration signals for a long time. In another embodiment, if the signal line of the vibration detection unit is connected to the control motherboard of the cabinet, the signal acquisition unit may be connected through an external BNC interface on the control motherboard, so as to realize that the vibration signal is rapidly transmitted to the signal acquisition unit.
The monitoring unit 15 is in communication connection with the signal acquisition unit 13, and is configured to acquire a digital signal and determine an impact signal according to the digital signal, where the impact signal is used to indicate an occurrence state of abnormal vibration. In an embodiment, the monitoring unit 15 is a computer or other platform with data processing capability, so that the monitoring unit 15 can read the digital signal corresponding to the vibration signal from the signal acquisition unit 13 in real time, and perform time domain/frequency domain processing on the digital signal to determine the impact signal according to the time domain/frequency domain processing result. In one embodiment, the specific process of acquiring the digital signal and determining the impact signal according to the digital signal by the monitoring unit 15 is as follows:
(1) the monitoring unit 15 acquires a digital signal from the signal acquisition unit 13.
(2) The monitoring unit 15 performs time domain processing and/or frequency domain processing on the digital signal to obtain a characteristic signal corresponding to the digital signal. If the time domain processing is performed, the characteristic signal corresponding to the digital signal should include the sampling time and amplitude value of each data point; if frequency domain processing is performed, the digital signal should include the frequency value and amplitude value of each data point.
(3) When one characteristic value of the characteristic signal exceeds a threshold value, the signal of the position corresponding to the characteristic value on the characteristic signal is determined as the impact signal. In a specific embodiment, see fig. 3, which shows the effect of comparing the normal vibration signal and the impact signal in the time domain, the characteristic value (i.e. amplitude value) of the vibration signal under normal conditions is in the range of [ -1,1], and around 262ms, a pulse signal with three amplitude values exceeding the range appears in the vibration signal, and then the pulse signals can be used as the impact signal to indicate that three times of large mechanical vibration is generated on the loop component. In another embodiment, see fig. 4, which shows the effect of comparing the normal vibration signal and the impact signal in the frequency domain, the vibration signal has a smaller characteristic value (i.e., amplitude value) in the normal case, and only the vibration signal around 15628Hz has a higher amplitude value, but, in a certain smaller time period, the vibration signal in the whole frequency domain rises to meet the characteristics of the impact signal, and then the vibration signal in the smaller time period can be used as the impact signal.
It should be understood by those skilled in the art that the signal acquisition unit 13 can realize continuous acquisition and recording of the vibration signal and digital conversion function, so that the vibration signal can be stored for a long time, and the monitoring unit 15 can retrieve the digital signal at any time and perform subsequent processing on the digital signal. Moreover, the monitoring unit 15 determines the impact signal according to the digital signal, so as to achieve the purpose of performing time domain/frequency domain processing on the digital signal, quickly implement operations such as signal peak value search, time axis comparison, fourier transform and the like, facilitate determining the impact signal according to the characteristics of the digital signal in the time domain/frequency domain, and facilitate increasing the accuracy of the impact signal in the determination.
In another embodiment, referring to FIG. 2, the loop loose component monitoring apparatus disclosed herein further includes a process control unit 17. The nuclear power plant unit N0 comprises one or more execution devices N02 for adjusting or testing the running state of the plant, and the process control unit 17 is connected with the execution device N02 and used for sending control commands to the execution device N02 to control the execution state of the execution device N02. The monitoring unit 15 is in communication connection with the process control unit 17, and is configured to obtain a control command of the process control unit 17, and determine a generation position of the abnormal vibration according to the control command and the impact signal. The actuating device N02 is an instrument device related to the loop component N01 in the nuclear power plant, such as a water pump in a circulating water loop, an electrically operated valve, a neutron measurement channel in a nuclear reactor, and the like.
In one particular embodiment, the process control unit 17 includes a group selector and the executive device N02 includes a plurality of neutron detectors. Then, during a neutron flux map measurement test (RPN test) of a circuit, the group selector is configured to send a control command for the test to each neutron detector and select one of the neutron detectors as a current neutron measurement channel to obtain a neutron flux map associated with the nuclear reactor. And then, when the monitoring unit judges that the tested control command is synchronous with the time of the impact signal, determining that the current neutron measurement channel generates abnormal vibration.
It should be understood by those skilled in the art that the process control unit 17 enables the monitoring unit 15 to perform time synchronization comparison between the determined impact signal and the control command of the process control unit 17, which is beneficial to determining the occurrence position of abnormal vibration according to the comparison result, and can overcome the defects that the existing monitoring device has a single function and cannot perform abnormal positioning, thereby providing convenience for users.
Further, in another embodiment, referring to fig. 2, the circuit loose part monitoring device disclosed in the present application further comprises an alarm unit 19, the alarm unit 19 being in signal connection with the monitoring unit 15 for generating an alarm message when the monitoring unit 15 determines an impact signal. The alarm information comprises contents such as abnormal vibration generation prompt, abnormal vibration positioning prompt and the like, and can be in any forms such as sound, characters, warning light and the like.
It should be understood by those skilled in the art that the present application also discloses a loose part monitoring method for a nuclear power plant, and referring to fig. 5, the loose part monitoring method comprises steps S100-S300, which are described below respectively.
And S100, acquiring a vibration signal of a loop component in the nuclear power unit. In one embodiment, referring to FIG. 1, the vibration detection unit 11 obtains vibration signals of a loop component N01 of a nuclear power plant N0 via one or more acceleration sensors.
Step S200, converting the vibration signal into a corresponding digital signal. In an embodiment, as shown in fig. 1, the signal acquisition unit 13 receives the vibration signal output by the vibration detection unit 11, converts each path of vibration signal into a corresponding digital signal through each input channel thereof, continuously acquires each path of vibration signal, and records and stores the digital signal corresponding to each path of vibration signal.
In step S300, an impact signal is determined according to the digital signal, wherein the impact signal is used for indicating the occurrence state of the abnormal vibration. In one embodiment, the monitoring unit 15 determines the impact signal according to the digital signal, and referring to fig. 6, the step S300 may include steps S310-S340, which are respectively described as follows.
In step S310, the monitoring unit 15 acquires the digital signal from the signal acquisition unit 13.
In step S320, the monitoring unit 15 performs time domain processing and/or frequency domain processing on the digital signal to obtain a characteristic signal corresponding to the digital signal. Time domain processing and frequency domain processing are common means for digital signal processing, and belong to the prior art, and are not described in detail here.
In step S330, the monitoring unit 15 determines the characteristic signal corresponding to the digital signal, and when a characteristic value of the characteristic signal exceeds a threshold, a signal corresponding to the characteristic value exceeding the threshold on the characteristic signal is used as an impact signal. The process of determining the impact signal can be seen in fig. 3, the corresponding embodiment of fig. 4, and the description of the two figures above.
In another embodiment, referring to fig. 2 and 7, the method for monitoring a loose component in a loop further disclosed in the present application further includes an abnormal vibration determining step S400, which is the next step of step S300, and the step S400 mainly includes steps S410-S440, where the step S400 includes the step of determining the generation position of the abnormal vibration by the monitoring unit 15 according to the control command output by the process control unit 17 and the impact signal determined by the monitoring unit itself.
In step S410, the monitoring unit 15 obtains the impact signal determined by itself, and the process of obtaining the impact signal may refer to step S300, which is not described herein again.
In step S420, the monitoring unit 15 obtains a control command for controlling an execution device N02 in the nuclear power plant N0, where the execution device N02 is used to adjust or test the operation state of the plant. In a particular embodiment, the monitoring unit 15 acquires control commands regarding the test, which the group selector sends to the neutron detector, where the control commands should include the time of transmission.
In step S430, the monitoring unit 15 determines whether the sending time of the control command and the determination time of the impact signal are synchronous, i.e. whether the time difference between the two signals satisfies the error range set by the user. If yes, the signal is considered to be synchronous and the process goes to step S440; otherwise, the signals are considered to be out of synchronization and the method proceeds to step S410 to continue to acquire the next impact signal.
And step S440, judging the generation position of the abnormal vibration according to the control command and the impact signal. In a specific embodiment, if the control command and the time of the impact signal are synchronized, it is determined that the execution device controlled by the control command generates abnormal vibration, for example, during a neutron flux map measurement test (RPN test) in a loop, the group selector sends a test control command to each neutron detector to select one of the neutron detectors as a current neutron measurement channel, and the neutron measurement channel vibrates due to the operation of the neutron detector when receiving the control command, so that the vibration is transmitted to a loop component on the loop, and the impact signal obtained by the monitoring unit 15 has high synchronicity with the control command in time, so that it is determined that the current neutron measurement channel generates abnormal vibration. After the occurrence position of the abnormal vibration is determined, the monitoring unit 15 can send out a message of an abnormal vibration generation prompt and an abnormal vibration positioning prompt through the alarm unit 19, so that a worker can know the occurrence position and the reason of the abnormal vibration, and the worker is guided to perform work such as alarm neglect, fault maintenance and the like.
As can be seen from the circuit loose part monitoring method disclosed in steps S100-S400, the circuit loose part monitoring device disclosed in the present application may provide some benefits to a nuclear power plant, including:
(1) the method is favorable for searching the root cause of the alarm unit triggered to alarm in the running process of the nuclear power unit, particularly in the process of a neutron flux diagram measurement test (RPN test) in a primary circuit, and the searching direction of the root cause is determined.
(2) Do benefit to the staff and know that a return circuit is not the warning that has not had the loose part and lead to, but the unusual vibration that the neutron flux graph measurement test in a return circuit arouses to the warning that arouses has avoided possible shutdown inspection work.
(3) The loop loose part monitoring device is simple in structure, utilizes the existing instruments and equipment to the maximum extent, finds a new method suitable for solving field problems, saves the cost possibly generated by project outsourcing, consultation and the like, and is favorable for promoting the progress of a loop neutron flux map test experiment.
(4) The abnormal possible position of the field device can be conveniently positioned, and the direction is clear for the overhaul work in overhaul.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by computer programs. When all or part of the functions of the above embodiments are implemented by a computer program, the program may be stored in a computer-readable storage medium, and the storage medium may include: a read only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc., and the program is executed by a computer to realize the above functions. For example, the program may be stored in a memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above may be implemented. In addition, when all or part of the functions in the above embodiments are implemented by a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and may be downloaded or copied to a memory of a local device, or may be version-updated in a system of the local device, and when the program in the memory is executed by a processor, all or part of the functions in the above embodiments may be implemented.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (6)
1. A loose part monitoring devices of return circuit for nuclear power unit, its characterized in that includes:
the vibration detection unit is used for detecting a vibration signal of a loop component in the nuclear power unit;
the signal acquisition unit is in signal connection with the vibration detection unit and is used for acquiring the vibration signal and converting the vibration signal into a corresponding digital signal;
the monitoring unit is in communication connection with the signal acquisition unit and is used for acquiring the digital signal and determining an impact signal according to the digital signal, wherein the impact signal is used for representing the occurrence state of abnormal vibration; specifically, the monitoring unit obtains the digital signal, performs time domain processing and/or frequency domain processing on the digital signal to obtain a characteristic signal corresponding to the digital signal, and determines that a signal at a position corresponding to a characteristic value on the characteristic signal is an impact signal when the characteristic value of the characteristic signal exceeds a threshold value;
the nuclear power generating unit comprises one or more execution devices for adjusting or testing the running state of the nuclear power generating unit, and the process control unit is connected with the execution devices and used for sending control commands to the execution devices to control the execution states of the execution devices; and the monitoring unit is in communication connection with the process control unit and is used for acquiring the control command and judging the generation position of abnormal vibration according to the control command and the impact signal.
2. The loop loose component monitoring device of claim 1, wherein the process control unit includes a bank selector, the implement equipment includes a plurality of neutron detectors;
the group selector is used for sending a test control command to each neutron detector and selecting one of the neutron detectors as a current neutron measurement channel; and when the monitoring unit judges that the time of the tested control command is synchronous with that of the impact signal, determining that the current neutron measurement channel generates abnormal vibration.
3. The circuit loose part monitoring device of claim 1, wherein the vibration detection unit comprises one or more acceleration probes, each acceleration probe being adapted to be disposed at a plurality of locations on a circuit part in a nuclear power plant to detect vibration signals therefrom.
4. The circuit loose part monitoring device of claim 3, wherein the signal acquisition unit comprises one or more input channels, each input channel for connection with a respective one of the acceleration probes, each input channel for converting a received vibration signal into a corresponding digital signal.
5. The circuit loose component monitoring device of claim 1, further comprising an alarm unit in signal communication with the monitoring unit for generating an alarm message when the monitoring unit determines the impact signal.
6. A method for monitoring loose parts of a loop of a nuclear power unit is characterized by comprising the following steps:
acquiring a vibration signal of a loop component in a nuclear power unit;
converting the vibration signal into a corresponding digital signal;
determining an impact signal according to the digital signal, wherein the impact signal is used for representing the occurrence state of abnormal vibration; the method specifically comprises the steps of obtaining the digital signal, carrying out time domain processing and/or frequency domain processing on the digital signal to obtain a characteristic signal corresponding to the digital signal, and when one characteristic value of the characteristic signal exceeds a threshold value, taking a signal corresponding to the characteristic value exceeding the threshold value on the characteristic signal as an impact signal;
and determining abnormal vibration, namely acquiring a control command for controlling an execution device in the nuclear power unit, wherein the execution device is used for adjusting or testing the running state of the nuclear power unit, judging the generation position of the abnormal vibration according to the control command and the impact signal, and if the time of the control command and the time of the impact signal are synchronous, determining that the execution device controlled by the control command generates the abnormal vibration.
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| CN110580960B (en) * | 2019-09-11 | 2024-07-02 | 阳江核电有限公司 | Foreign matter monitoring system and method for pressurized water reactor nuclear power station secondary loop |
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| CN107767975A (en) * | 2017-10-17 | 2018-03-06 | 中北大学 | A kind of nuclear power unit closes the monitoring and fault diagnosis method of heavy parts capability and performance |
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| JP2009198365A (en) * | 2008-02-22 | 2009-09-03 | National Agriculture & Food Research Organization | Radiation surveillance system using plastic scintillator as detector |
| CN102117666B (en) * | 2009-12-31 | 2012-08-29 | 中国核动力研究设计院 | Impactor |
| JP2015075855A (en) * | 2013-10-08 | 2015-04-20 | 株式会社東芝 | Plant operation monitoring apparatus, method and program |
| CN105225433B (en) * | 2015-08-22 | 2017-10-10 | 上海核工程研究设计院 | A kind of nuclear power station loose part monitor and alarm system and method |
| CN105427904A (en) * | 2015-11-13 | 2016-03-23 | 陕西卫峰核电子有限公司 | Loose part positioning method based on nuclear power station |
| CN106409351A (en) * | 2016-09-13 | 2017-02-15 | 中广核工程有限公司 | Method and device for processing vibration signal of loose part of nuclear power plant |
| CN107146648A (en) * | 2017-05-05 | 2017-09-08 | 中广核工程有限公司 | A kind of monitoring system and method for nuclear power generating equipment |
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| CN102706548A (en) * | 2012-05-30 | 2012-10-03 | 冯平 | Bolt or nut loosening monitoring device |
| CN107767975A (en) * | 2017-10-17 | 2018-03-06 | 中北大学 | A kind of nuclear power unit closes the monitoring and fault diagnosis method of heavy parts capability and performance |
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