Nuclear power plant malfunction self-diagnosis alarm device

Abstract

This application proposes a self-diagnostic alarm device for nuclear power plant faults, comprising an analog input module, a digital input module, a first digital output module, a main control module, and a fault reset switch. The fault reset switch is connected to the digital input module; the digital input module, analog input module, and first digital output module are all connected to the main control module. The analog input fault algorithm unit, digital input fault algorithm unit, digital output fault algorithm unit, and main control fault algorithm unit in the main control module are respectively connected to a first RS flip-flop, a second RS flip-flop, a third RS flip-flop, and a fourth RS flip-flop. The output of each RS flip-flop is connected to the first digital output module. The self-diagnostic alarm device for nuclear power plant faults proposed in this application, by setting different algorithm units in the main control module, achieves automatic detection of faults in different modules, facilitating fault location and maintenance.

Description

Technical Field

[0001] This application relates to the field of nuclear power plant fault diagnosis and maintenance, and in particular to a self-diagnostic alarm device for nuclear power plant faults. Background Technology

[0002] Currently, most control devices used in nuclear power plants employ either analog or digital technology. Analog control devices lack self-diagnostic capabilities and can only be tested periodically. While digital control devices do have self-diagnostic capabilities, they require a network connection to a server to record alarms. However, servers themselves have a high failure rate, and the use of network communication cannot guarantee network security.

[0003] Patent CN112489389A discloses a nuclear power plant alarm system, which includes a diversified drive system control station, a digital protection system control station, and safety-grade monitoring equipment, all connected to the diversified drive system control station. The diversified drive system control station issues an alarm signal when it determines that the protection function of the digital protection system control station has failed and / or receives a fault signal from the safety-grade monitoring equipment. The safety-grade monitoring equipment includes a self-diagnostic unit for monitoring its own faults and issuing fault signals. Although patent CN112489389A discloses an alarm system including a self-diagnostic unit, this alarm system cannot pinpoint the location of the fault.

[0004] Patent CN103700414A discloses a nuclear power plant diversity drive system and method. The diversity drive system includes a diversity drive cabinet, which comprises a judgment module and an interface module. The interface module includes an RPN interface, an RPC interface, etc. The judgment module determines whether a first automatic drive signal is generated based on a neutron flux rate signal, a first state signal, and a second state signal. When a first automatic drive signal is generated, it transmits the first automatic drive signal to the shutdown coil through a first hard-wired interface to control the reactor of the nuclear power plant to automatically shut down. The judgment module also determines whether a second automatic drive signal is generated based on the neutron flux rate signal, the first state signal, and a third state signal. When a second automatic drive signal is generated, it drives the turbine to trip through a second hard-wired interface. Patent CN103700414A also discloses a nuclear power plant fault detection system, whose judgment module determines whether to generate a drive signal based on multiple signals. However, this system does not involve self-diagnosis of signals from different modules and therefore cannot determine the source of the fault. Summary of the Invention

[0005] The purpose of this application is to at least partially solve one of the aforementioned technical problems.

[0006] Therefore, the first objective of this application is to propose a self-diagnostic alarm device for nuclear power plant faults, which facilitates fault location and maintenance, avoids the use of network communication to transmit alarm signals, and ensures network security.

[0007] To achieve the above objectives, the first aspect of this application proposes a self-diagnostic alarm device for nuclear power plant faults, comprising an analog input module, a digital input module, a first digital output module, a main control module, and a fault reset switch.

[0008] The fault reset switch is connected to the switch input module;

[0009] The digital input module, the analog input module, and the first digital output module are all connected to the main control module.

[0010] The main control module includes an analog input fault algorithm unit, a digital input fault algorithm unit, a digital output fault algorithm unit, a main control fault algorithm unit, a first RS flip-flop, a second RS flip-flop, a third RS flip-flop, and a fourth RS flip-flop.

[0011] The analog input fault algorithm unit is connected to the input terminal of the first RS flip-flop, and the output terminal of the first RS flip-flop is connected to the first digital output module.

[0012] The digital input fault algorithm unit is connected to the input terminal of the second RS flip-flop, and the output terminal of the second RS flip-flop is connected to the first digital output module.

[0013] The switch output fault algorithm unit is connected to the input terminal of the third RS flip-flop, and the output terminal of the third RS flip-flop is connected to the first switch output module.

[0014] The main control fault algorithm unit is connected to the input terminal of the fourth RS flip-flop, and the output terminal of the fourth RS flip-flop is connected to the first switch output module.

[0015] Optionally, the digital input module, the analog input module, and the first digital output module are all connected to the main control module via an I / O bus.

[0016] Optionally, the first digital output module includes an analog input fault indicator, a digital input fault indicator, and a main control fault indicator.

[0017] The analog input fault indicator is connected to the output of the first RS flip-flop, the digital input fault indicator is connected to the output of the second RS flip-flop, and the main control fault indicator is connected to the output of the fourth RS flip-flop.

[0018] Optionally, the device further includes a second switch output module, which is connected to the main control module.

[0019] Optionally, the second digital output module is connected to the main control module via an I / O bus.

[0020] Optionally, the main control module further includes an OR gate, wherein the output terminals of the first RS flip-flop, the second RS flip-flop, the third RS flip-flop, and the fourth RS flip-flop are all connected to the input terminal of the OR gate, and the output terminal of the OR gate is connected to the second switch output module.

[0021] Optionally, the second switch output module is located in the main control room.

[0022] Optionally, the second switch output module includes a first switch output fault indicator light.

[0023] Optionally, the first switch output module may also include a second switch output fault indicator.

[0024] Optionally, the second switch output fault indicator is connected to the output terminal of the third RS trigger.

[0025] The nuclear power plant fault self-diagnosis alarm device of this application realizes self-detection of faults in different modules by setting up analog input fault algorithm unit, digital input fault algorithm unit, digital output fault algorithm unit and main control fault algorithm unit in the main control module, which facilitates fault location and maintenance.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of a nuclear power plant fault self-diagnosis alarm device according to an embodiment of this application. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the structure of a nuclear power plant fault self-diagnosis alarm device according to an embodiment of this application. Figure 2 ;

[0030] Figure 3This is a schematic diagram of the structure of a nuclear power plant fault self-diagnosis alarm device according to an embodiment of this application. Figure 3 . Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0033] The following description, with reference to the accompanying drawings, describes a nuclear power plant fault self-diagnosis alarm device according to an embodiment of this application.

[0034] like Figure 1 As shown, the nuclear power plant fault self-diagnosis alarm device includes an analog input module 100, a digital input module 200, a first digital output module 300, a main control module 400, and a fault reset switch 500.

[0035] The fault reset switch 500 is connected to the digital input module 200; the digital input module 200, the analog input module 100, and the first digital output module 300 are all connected to the main control module 400. The main control module 400 is used to detect and diagnose faults in the digital input module 200, the analog input module 100, and the first digital output module 300. The main control module 400 has a self-diagnostic function; faults in the digital input module 200, the analog input module 100, and the first digital output module 300 can be detected through self-diagnosis and can participate in the logical operations of the main control module 400.

[0036] In this embodiment, the digital input module 200, the analog input module 100, and the first digital output module 300 are all connected to the main control module 400 via an I / O bus. As an example, the fault reset switch 500 is installed on the test panel of the control cabinet. When maintenance personnel confirm a fault, they can reset the alarm by controlling the fault reset switch 500 on the test panel of the control cabinet.

[0037] The main control module 400 includes an analog input fault algorithm unit 410, a digital input fault algorithm unit 420, a digital output fault algorithm unit 430, a main control fault algorithm unit 440, a first RS flip-flop 450, a second RS flip-flop 460, a third RS flip-flop 470, and a fourth RS flip-flop 480.

[0038] The connection relationships between each algorithm unit and each RS flip-flop in the main control module 400 are as follows: the analog input fault algorithm unit 410 is connected to the input terminal of the first RS flip-flop 450, and the output terminal of the first RS flip-flop 450 is connected to the first digital output module 300; the digital input fault algorithm unit 420 is connected to the input terminal of the second RS flip-flop 460, and the output terminal of the second RS flip-flop 460 is connected to the first digital output module 300; the digital output fault algorithm unit 430 is connected to the input terminal of the third RS flip-flop 470, and the output terminal of the third RS flip-flop 470 is connected to the first digital output module 300; the main control fault algorithm unit 440 is connected to the input terminal of the fourth RS flip-flop 480, and the output terminal of the fourth RS flip-flop 480 is connected to the first digital output module 300. In this embodiment, fault detection and diagnosis are performed on each module using analog input fault algorithm unit 410, digital input fault algorithm unit 420, digital output fault algorithm unit 430, and main control fault algorithm unit 440, respectively. For example, analog input fault algorithm unit 410 is used to diagnose whether analog input module 100 is faulty. If analog input module 100 is faulty, the output of analog input fault algorithm unit 410 changes from "0" to "1". At this time, the output state of the corresponding first RS flip-flop 450 changes, thereby connecting the corresponding channel of the first digital output module 300 and realizing an alarm. Similarly, digital input fault algorithm unit 420 diagnoses whether digital input module 200 is faulty; digital output fault algorithm unit 430 diagnoses whether the first digital output module 300 is faulty; and main control fault algorithm unit 440 diagnoses whether the main control module 400 itself is faulty. In addition, the use of RS flip-flops can latch the fault state (maintain the fault output state) to avoid the loss of fault state when a flashing fault alarm occurs.

[0039] In one embodiment of this application, such as Figure 2 As shown, the first digital output module 300 includes an analog input fault indicator 310, a digital input fault indicator 320, and a main control fault indicator 330. The analog input fault indicator 310 is connected to the output of the first RS flip-flop 450, the digital input fault indicator 320 is connected to the output of the second RS flip-flop 460, and the main control fault indicator 330 is connected to the output of the fourth RS flip-flop 480.

[0040] In addition, the first digital output module 300 also includes a second digital output fault indicator 340, which is connected to the output terminal of the third RS trigger 470.

[0041] When a fault is diagnosed, the RS trigger illuminates the corresponding indicator light in the first digital output module channel, providing a direct visual indication of the fault. For example, an illuminated analog input fault indicator light 310 indicates a fault in analog input module 100; an illuminated digital input fault indicator light 320 indicates a fault in digital input module 200; and an illuminated main control fault indicator light 330 indicates a fault in main control module 400. Furthermore, the first digital output module 300 itself also has a corresponding indicator light; for instance, an illuminated second digital output fault indicator light 340 indicates a fault in the first digital output module 300. By displaying different fault conditions for different modules using different indicator lights, fault location and repair become easier.

[0042] In yet another embodiment of this application, such as Figure 3 As shown, the nuclear power plant fault self-diagnosis alarm device also includes a second switch output module 600, which is connected to the main control module 400. In this embodiment, the second switch output module 600 is connected to the main control module 400 via an I / O bus. The second switch output module 600 is located in a remote main control room and includes a first switch output fault indicator light 610.

[0043] The main control module 400 also includes an OR gate 490. The outputs of the first RS flip-flop 450, the second RS flip-flop 460, the third RS flip-flop 470, and the fourth RS flip-flop 480 are all connected to the input of the OR gate 490. The output of the OR gate 490 is connected to the second digital output module 600. When any one of the outputs of the first RS flip-flop 450, the second RS flip-flop 460, the third RS flip-flop 470, and the fourth RS flip-flop 480 outputs 1, the second digital output module 600 connected to the OR gate 490 is triggered to conduct, and the first digital output fault indicator 610 is illuminated, thereby realizing a comprehensive alarm for faults in the remote main control room. When the operator observes that 610 is illuminated in the remote main control room, they can locate the faulty module by observing the indicator lights on the first digital output module 300. The following describes in detail the fault detection method of the nuclear power plant fault self-diagnosis alarm device, taking the fault of the analog input module 100 as an example. When the main control module 400 detects a fault in the analog input module 100, the output of the analog input fault algorithm unit 410 changes from "0" to "1". At this time, the output state of the first RS flip-flop 450 corresponding to the analog input fault algorithm unit 410 changes, thereby illuminating the analog input fault indicator 310 in the first digital output module 300. Simultaneously, the first digital output fault indicator 610 of the remote main control is illuminated, thereby alerting the operator that the module has malfunctioned.

[0044] The beneficial effects of this application are as follows: 1) By independently setting up analog input fault algorithm units, digital input fault algorithm units, digital output fault algorithm units, and main control fault algorithm units in the main control module, self-detection of faults in different modules is realized; 2) By setting up indicator light connections in different detection modules, the faults are displayed through the indicator lights, making the faults more intuitive and easier to locate; 3) The fault status is latched by RS triggers to avoid the loss of fault status; 4) The nuclear power plant fault self-diagnosis alarm device does not connect to the server through network communication to record alarms, ensuring network security; 5) The nuclear power plant fault self-diagnosis alarm device has fewer hard-wired connections and is easy to install.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0046] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0047] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0048] It should be noted that, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A self-diagnostic alarm device for nuclear power plant faults, characterized in that, It includes an analog input module (100), a digital input module (200), a first digital output module (300), a main control module (400), and a fault reset switch (500). The fault reset switch (500) is connected to the switch input module (200); The digital input module (200), the analog input module (100), and the first digital output module (300) are all connected to the main control module (400); The main control module (400) includes an analog input fault algorithm unit (410), a digital input fault algorithm unit (420), a digital output fault algorithm unit (430), a main control fault algorithm unit (440), a first RS flip-flop (450), a second RS flip-flop (460), a third RS flip-flop (470), and a fourth RS flip-flop (480). The analog input fault algorithm unit (410) is connected to the input terminal of the first RS flip-flop (450), and the output terminal of the first RS flip-flop (450) is connected to the first digital output module (300). The digital input fault algorithm unit (420) is connected to the input terminal of the second RS flip-flop (460), and the output terminal of the second RS flip-flop (460) is connected to the first digital output module (300). The switch output fault algorithm unit (430) is connected to the input terminal of the third RS flip-flop (470), and the output terminal of the third RS flip-flop (470) is connected to the first switch output module (300). The main control fault algorithm unit (440) is connected to the input terminal of the fourth RS flip-flop (480), and the output terminal of the fourth RS flip-flop (480) is connected to the first switch output module (300). The device further includes a second switch output module (600), which is connected to the main control module (400); The main control module (400) also includes an OR gate (490). The output terminals of the first RS flip-flop (450), the second RS flip-flop (460), the third RS flip-flop (470), and the fourth RS flip-flop (480) are all connected to the input terminal of the OR gate (490). The output terminal of the OR gate (490) is connected to the second switch output module (600).

2. The nuclear power plant fault self-diagnosis alarm device as described in claim 1, characterized in that, The digital input module (200), the analog input module (100), and the first digital output module (300) are all connected to the main control module (400) via an I / O bus.

3. The nuclear power plant fault self-diagnosis alarm device as described in claim 1, characterized in that, The first digital output module (300) includes an analog input fault indicator (310), a digital input fault indicator (320), and a main control fault indicator (330). The analog input fault indicator (310) is connected to the output of the first RS flip-flop (450), the digital input fault indicator (320) is connected to the output of the second RS flip-flop (460), and the main control fault indicator (330) is connected to the output of the fourth RS flip-flop (480).

4. The nuclear power plant fault self-diagnosis alarm device as described in claim 1, characterized in that, The second digital output module (600) is connected to the main control module (400) via an I / O bus.

5. The nuclear power plant fault self-diagnosis alarm device as described in claim 1, characterized in that, The second switch output module (600) is located in the main control room.

6. The nuclear power plant fault self-diagnosis alarm device as described in claim 1, characterized in that, The second digital output module (600) includes a first digital output fault indicator (610).

7. The nuclear power plant fault self-diagnosis alarm device as described in claim 3, characterized in that, The first digital output module (300) also includes a second digital output fault indicator (340).

8. The nuclear power plant fault self-diagnosis alarm device as described in claim 7, characterized in that, The second switch output fault indicator (340) is connected to the output terminal of the third RS trigger (470).

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