Alarm module, method and control system for a safety class control system of a nuclear facility

Abstract

The application discloses an alarm module of a nuclear facility safety level control system, an alarm method and a safety level control system, and belongs to the technical field of nuclear facility control. The alarm module comprises an input unit, a logic array unit and an output unit. The input unit is used for outputting four-way on-off quantity input signals to the logic array unit, wherein the on-off quantity input signals comprise alarm confirmation and muting signals DI1, pilot lamp signals DI2, alarm signals DI3 and alarm signals DI4. The logic array unit is used for realizing a first logic expression function through a logic circuit and outputting three-way control signals. The output unit is used for receiving the three-way control signals and controlling the on-off of the loop of an external horn and lamp through a circuit breaker. The module integrates the alarm function, the alarm confirmation and muting function and the pilot lamp function, occupies a small space, and is modularized and integrated, so that installation, debugging and maintenance are more convenient, and thus the safety of the nuclear facility is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of nuclear facility control, and particularly relates to an alarm module of a safety class control system of a nuclear facility, an alarm method and the safety class control system. BACKGROUND

[0002] The safety class control system is one of important safety systems of a spent fuel reprocessing plant, and plays an extremely important role in environmental protection, protection of plant equipment and personnel safety and improvement of the availability of the spent fuel reprocessing plant, wherein the safety class control system comprises a safety class control panel, and the safety class control panel is installed with digital display instruments, buttons, alarm lights, indicator lights, relays and other elements.

[0003] The safety class measurement points of the spent fuel reprocessing plant adopt a redundant measurement mode, when one of the instrument signals exceeds a threshold value, a sound alarm needs to be generated through a loudspeaker, and the corresponding alarm light is triggered to flash, and the alarm sound can be eliminated through the alarm mute button on the control panel. At present, the alarm function of the safety class measurement points is realized by a hardware circuit built with pure relays, however, the safety class measurement points of the spent fuel reprocessing plant are numerous, and the surface resources of the safety class control panel are limited, and the alarm circuit built with relays has problems of large occupied space, many lines, and inconvenience in installation, debugging and maintenance. SUMMARY

[0004] The present application aims to solve the above problems in the prior art, and provides an alarm module of a safety class control system of a nuclear facility, an alarm method and the safety class control system, the alarm function, the alarm confirmation and mute function and the test light function of the safety class control system are integrated based on a logic circuit, the occupied space is small, and the modular integration makes the installation, debugging and maintenance more convenient, thereby improving the safety of the nuclear facility.

[0005] In a first aspect, the present application provides an alarm module of a safety class control system of a nuclear facility, comprising an input unit, a logic array unit and an output unit.

[0006] The input unit is connected with the logic array unit, and is used for outputting four-way switching quantity input signals to the logic array unit, wherein the four-way switching quantity input signals comprise alarm confirmation and mute signals DI1, test light signals DI2, alarm signals DI3 and alarm signals DI4. The logic array unit is used for realizing the following first logic expression function through a logic circuit, and outputting three-way control signals:

[0007]

[0008] The first logic expression function includes alarm function, alarm confirmation and muting function, and test light function. The three-way control signal includes alarm sound signal DO1, lamp signal DO2 corresponding to alarm signal DI3, and lamp signal DO3 corresponding to alarm signal DI4. A in the first logic expression is the instantaneous trigger state of alarm confirmation and muting signal DI1, B is the input state of test light signal DI2, C is the input state of alarm signal DI3, D is the input state of alarm signal DI4, Y1 is the output state of alarm sound signal DO1, Y2 is the output state of lamp signal DO2, Y3 is the output state of lamp signal DO3, 1 of Y4 is the 0 / 1 state of lamp signal DO2, and 1 of Y5 is the 0 / 1 state of lamp signal DO3. represents non-A, represents non-C, represents non-D. The output unit is connected with the logic array unit, and is used for receiving the three-way control signal and controlling the on-off of the loop of the external horn and lamp through the circuit breaker.

[0009] Preferably, the logic array unit includes a first DQ flip-flop, a second DQ flip-flop, a square wave generator unit, a plurality of logic AND gates, a plurality of logic NOT gates, and a plurality of logic OR gates.

[0010] The input end of the first DQ flip-flop receives alarm confirmation and muting signal DI1, the inverting output end of the first DQ flip-flop is connected to logic AND gate 8H, alarm signal DI3 is connected to logic AND gate 8H and the clear input end of the first DQ flip-flop. At the same time, the input end of the second DQ flip-flop receives alarm confirmation and muting signal DI1, the inverting output end of the second DQ flip-flop is connected to logic AND gate 8G, alarm signal DI4 is connected to logic AND gate 8G and the clear input end of the second DQ flip-flop. The output ends of logic AND gate 8H and logic AND gate 8G are both connected to logic OR gate 12E, and logic OR gate 12E outputs alarm sound signal DO1, thereby realizing alarm function, alarm confirmation and muting function.

[0011] The input end of logic AND gate 8E receives test light signal DI2, and the input end of logic AND gate 8E is also connected to the output end of logic NOT gate 5E. The input end of logic NOT gate 5E receives alarm signal DI3. The non-inverting output end of the first DQ flip-flop and the output end of the square wave generator unit are both connected to logic OR gate 9E. The output end of logic OR gate 9E and alarm signal DI3 are both connected to logic AND gate 11H. Logic AND gate 11H and logic AND gate 8E are both connected to the input end of logic OR gate 9H. Logic OR gate 9H outputs lamp signal DO2, thereby realizing test light function, alarm confirmation and muting function.

[0012] The input end of the logic and gate 8F receives the test lamp signal DI2, and the input end of the logic and gate 8F is also connected with the output end of the logic not gate 5F, the input end of the logic not gate 5F receives the alarm signal DI4, the positive phase output end of the second DQ flip-flop and the output end of the square wave generator unit are all connected with the logic or gate 9F, the output end of the logic or gate 9F and the alarm signal DI4 are all connected with the logic and gate 11G, the logic and gate 11G and the logic and gate 8F are all connected with the input end of the logic or gate 9G, and the logic or gate 9G outputs the lamp signal DO3, which is used to realize the test lamp function, alarm confirmation and mute function.

[0013] Preferably, the logic array unit is also used to realize the following second logic expression function through the logic circuit: The second logic expression function includes the fail-safe function, and Y0 is a module failure.

[0014] Preferably, the logic array unit further comprises a fail-safe function circuit. The fail-safe function circuit comprises a fault lamp, a plurality of logic not gates, a plurality of logic and gates and a plurality of logic or gates.

[0015] The positive phase output end of the first DQ flip-flop and the positive phase output end of the second DQ flip-flop are both connected with the logic or gate 12F, the output end of the logic or gate 12F is respectively connected with the logic not gate 6H, the logic and gate 16H and the logic and gate 11F, the output end of the logic not gate 6H is respectively connected with the logic and gate 14G and the logic and gate 14H, the output end of the logic or gate 12E is respectively connected with the logic not gate 6E, the logic and gate 16E, the logic and gate 16F, the logic and gate 11E and the logic and gate 18E, the output end of the logic not gate 6E is respectively connected with the logic and gate 14E and the logic and gate 14F, the output end of the logic and gate 14E is connected with the logic and gate 14G, the alarm signal DI3 is respectively connected with the logic not gate 6G and the logic and gate 14E, the output end of the logic not gate 6G is respectively connected with the logic and gate 16G and the logic and gate 16F, the alarm signal DI4 is respectively connected with the logic not gate 6F and the logic and gate 14F, the output end of the logic not gate 6F is respectively connected with the logic and gate 16E and the logic and gate 11E, the output end of the logic and gate 14F is connected with the logic and gate 14H, the output end of the logic and gate 16E is connected with the logic and gate 16G, the output end of the logic and gate 16F is connected with the logic and gate 16H, and the output end of the logic and gate 11E is connected with the logic and gate 11F.

[0016] The output terminals of the logic AND gate 14G and the logic AND gate 14H are connected to the input terminal of the logic OR gate 13E, the output terminals of the logic OR gate 13E and the logic AND gate 16G are connected to the input terminal of the logic OR gate 13F, the output terminals of the logic OR gate 13F and the logic AND gate 16H are connected to the input terminal of the logic OR gate 13G, the output terminals of the logic OR gate 13G and the logic AND gate 11F are connected to the input terminal of the logic OR gate 13H, the output terminal of the logic OR gate 13H is connected to the input terminal of the fault light and the logic NOT gate 5G in sequence, the output terminal of the logic NOT gate 5G is connected to the input terminals of the logic AND gate 18E, the logic AND gate 18F and the logic AND gate 18G respectively, the output terminal of the logic OR gate 9H is connected to the input terminal of the logic AND gate 18F, the output terminal of the logic OR gate 9G is connected to the input terminal of the logic AND gate 18G, the logic AND gate 18E outputs the alarm sound signal DO1, the logic AND gate 18F outputs the light signal DO2, the logic AND gate 18G outputs the light signal DO3, and the fault safety function circuit is used to realize the fault safety function.

[0017] Preferably, the square wave generator unit comprises a crystal oscillator, a frequency divider and a frequency modulation circuit.

[0018] The input terminal of the frequency divider is connected to the crystal oscillator in series, the frequency divider is used to divide the frequency of the crystal oscillator to obtain a square wave signal with a second frequency and a preset amplitude. The frequency modulation circuit comprises a rotary encoding switch, a counter and a D flip-flop connected in series, the input terminal of the counter is connected to the output terminal of the frequency divider, and the frequency modulation circuit is used to adjust the period of the square wave signal to realize the adjustable alarm output frequency function.

[0019] Preferably, the logic array unit comprises a first DQ flip-flop, a second DQ flip-flop and a logic NOR gate. The input terminals of the first DQ flip-flop and the second DQ flip-flop receive the alarm confirmation and muting signal DI1, the alarm signal DI3 is connected to the clear input terminal of the first DQ flip-flop, the alarm signal DI4 is connected to the clear input terminal of the second DQ flip-flop, the non-inverted output terminals of the first DQ flip-flop and the second DQ flip-flop are connected to the logic NOR gate, and the logic NOR gate is used to output the instantaneous action trigger state A of the alarm confirmation and muting signal DI1.

[0020] Preferably, the input unit comprises four processing components, and the four processing components are used to output one-way switch quantity input signals respectively. The processing component comprises a gas discharge tube, an optocoupler driving circuit, a Schmitt trigger and an RC filter circuit. The switch quantity input signal is connected to the optocoupler driving circuit in series after being connected to the gas discharge tube in parallel, the output terminal of the optocoupler driving circuit is connected to the Schmitt trigger, the output terminal of the Schmitt trigger is connected to the RC filter circuit, and the RC filter circuit is used to output the switch quantity input signal.

[0021] Preferably, the alarm module further comprises a power supply unit.

[0022] The power supply unit is connected with the input unit and the logic array unit respectively, and is used for providing power supply for the input unit and the logic array unit. The power supply unit comprises a direct current power supply, an anti-surge and static electricity circuit, an anti-reverse connection circuit, an EMC filter, and an isolated voltage stabilizing power supply. The input end of the anti-surge and static electricity circuit is connected with the direct current power supply, and the output end of the anti-surge and static electricity circuit is connected with the input end of the anti-reverse connection circuit. The input end of the EMC filter is connected with the output end of the anti-reverse connection circuit, the output end of the EMC filter is connected with a plurality of parallel isolated voltage stabilizing power supplies, and the EMC filter is used for filtering high-frequency interference and electromagnetic radiation. The output ends of the plurality of isolated voltage stabilizing power supplies are connected with the logic array unit and the input unit respectively.

[0023] Preferably, the output unit comprises three relays. The three relays are used for receiving three control signals output by the logic array unit respectively.

[0024] In the second aspect, the application further provides an alarm method of the nuclear facility safety level control system, comprising: receiving four switching quantity input signals, wherein the four switching quantity input signals comprise an alarm confirmation and muting signal DI1, a test lamp signal DI2, an alarm signal DI3, and an alarm signal DI4; realizing the following first logic expression function through a logic circuit to obtain three control signals,

[0025]

[0026] The first logic expression function comprises an alarm function, an alarm confirmation and muting function, and a test lamp function. The three control signals comprise an alarm sound signal DO1, a lamp signal DO2 corresponding to the alarm signal DI3, and a lamp signal DO3 corresponding to the alarm signal DI4. A in the first logic expression is a momentary trigger state of the alarm confirmation and muting signal DI1, B is an input state of the test lamp signal DI2, C is an input state of the alarm signal DI3, D is an input state of the alarm signal DI4, Y1 is an output state of the alarm sound signal DO1, Y2 is an output state of the lamp signal DO2, Y3 is an output state of the lamp signal DO3, 1 of Y4 is a 0 / 1 state of the lamp signal DO2, and 1 of Y5 is a 0 / 1 state of the lamp signal DO3, represents not A, represents not C, represents not D; and the three control signals are connected with the circuits of the external horn and lamp through the circuit breaker respectively.

[0027] In a third aspect, the present application further provides a nuclear facility safety level control system, comprising a safety level control panel and the alarm module of the nuclear facility safety level control system according to the first aspect. The input end of the alarm module of the nuclear facility safety level control system is connected with the panel button and the threshold comparison module of the safety level control panel, and the output end is connected with the loudspeaker and the lamp of the safety level control panel. The alarm module is used for receiving the on-off input signal of the safety level control panel and outputting the corresponding fault alarm control signal.

[0028] The alarm module, the alarm method and the safety level control system of the nuclear facility safety level control system provided by the present application realize the integration of the alarm function, the alarm confirmation and silencing function and the test lamp function of the safety level control system based on the logic circuit, output the fault alarm control signal meeting the function through the design of the logic expression meeting the alarm function, the alarm confirmation and silencing function and the test lamp function, and based on the four-way on-off input signal and the logic circuit realizing the logic expression. Therefore, the integration of the alarm function, the alarm confirmation and silencing function and the test lamp function of the safety level control system based on the logic circuit occupies small space, and the modular integration makes the installation, debugging and maintenance more convenient, thereby improving the safety of the nuclear facility. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The figure is a schematic diagram of the logic array unit structure of the alarm module of the embodiment 1 of the present application;

[0030] Figure 2 The figure is a schematic diagram of the logic array unit structure of another alarm module of the embodiment 1 of the present application;

[0031] Figure 3 The figure is a schematic diagram of the square wave generator unit structure of the embodiment 1 of the present application;

[0032] Figure 4 The figure is a schematic diagram of the logic circuit between the alarm confirmation and silencing signal and the alarm signal of the embodiment 1 of the present application;

[0033] Figure 5 The figure is a schematic diagram of the structure of the input unit of the embodiment 1 of the present application;

[0034] Figure 6 The figure is a schematic diagram of the structure of the alarm module of the embodiment 1 of the present application;

[0035] Figure 7 The figure is a schematic diagram of the structure of the power supply unit of the embodiment 1 of the present application;

[0036] Figure 8 The figure is a schematic diagram of the structure of the output unit of the embodiment 1 of the present application;

[0037] Figure 9 The figure is a schematic diagram of the structure of the shell of the installation alarm module of the embodiment 1 of the present application;

[0038] Figure 10 Figure 1 is a structural shell front view of an embodiment of the present application;

[0039] Figure 11 Figure 2 is a wiring arrangement schematic diagram of a structural shell of an embodiment of the present application;

[0040] Figure 12 Figure 3 is an alarm method flowchart of a nuclear facility safety level control system of an embodiment of the present application;

[0041] Figure 13 Figure 4 is an alarm module interface schematic diagram of an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the skilled in the art better understand the technical solutions of the present application, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0043] It can be understood that the specific embodiments and drawings described herein are merely used to explain the present application, but not to limit the present application.

[0044] It can be understood that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0045] It can be understood that, for the convenience of description, only the parts related to the present application are shown in the drawings of the present application, and the parts unrelated to the present application are not shown in the drawings.

[0046] It can be understood that each unit and module involved in the embodiments of the present application can correspond to only one entity structure, or can be composed of multiple entity structures, or multiple units and modules can be integrated into one entity structure.

[0047] It can be understood that the functions and steps marked in the flowcharts and block diagrams of the present application can occur in an order different from that marked in the drawings without conflict.

[0048] It can be understood that in the flowcharts and block diagrams of the present application, the system, device, equipment, method according to the embodiments of the present application are shown as possible implementation architecture, function and operation. Each block in the flowchart or block diagram can represent a unit, module, program segment, code, which contains executable instructions for realizing the specified function. Moreover, each block or combination of blocks in the block diagram and flowchart can be realized by a hardware-based system for realizing the specified function, or by a combination of hardware and computer instructions.

[0049] It can be understood that the units and modules involved in the embodiments of the present application can be realized in the form of software or hardware, for example, the units and modules can be located in a processor.

[0050] Embodiment 1:

[0051] The embodiment provides an alarm module of a nuclear facility safety level control system, which can be applied to a safety level control system scene of a nuclear power plant or a spent fuel reprocessing plant.

[0052] An alarm module of a nuclear facility safety level control system comprises an input unit, a logic array unit and an output unit.

[0053] The input unit is connected with the logic array unit and is used for outputting four-way switching quantity input signals to the logic array unit, wherein the four-way switching quantity input signals comprise alarm confirmation and muting signals DI1, pilot lamp signals DI2, alarm signals DI3 and alarm signals DI4. The logic array unit is used for realizing the following first logic expression functions through a logic circuit and outputting three-way control signals,

[0054]

[0055] The first logic expression functions comprise alarm functions, alarm confirmation and muting functions and pilot lamp functions, the three-way control signals comprise alarm sound signals DO1, lamp signals DO2 corresponding to the alarm signals DI3 and lamp signals DO3 corresponding to the alarm signals DI4, A in the first logic expression is a momentary trigger state of the alarm confirmation and muting signals DI1, B is an input state of the pilot lamp signals DI2, C is an input state of the alarm signals DI3, D is an input state of the alarm signals DI4, Y1 is an output state of the alarm sound signals DO1, Y2 is an output state of the lamp signals DO2, Y3 is an output state of the lamp signals DO3, 1 of Y4 is a 0 / 1 state of the lamp signals DO2, 1 of Y5 is a 0 / 1 state of the lamp signals DO3, represents non-A, represents non-C, represents non-D, and the output unit is connected with the logic array unit and is used for receiving the three-way control signals and controlling the on-off of loops of external horns and lamps through circuit breakers.

[0056] In this embodiment, since the safety-level control system consists entirely of hardware circuits, it boasts high reliability. To meet the reliability requirements of the safety-level control system, this embodiment designs a first logic expression to implement alarm, alarm confirmation and silencing, and test light functions. The first logic expression function can then be implemented using different pure hardware logic circuits to meet reliability requirements. The alarm confirmation and silencing function refers to the ability to stop the alarm from sounding when a specific button is pressed or a specific device is operated, thus confirming the alarm and silencing the alarm sound. The test light function refers to the flashing or lighting of a light indicator on the alarm when it sounds, making it easier for the user to locate or check the alarm's status. In this embodiment, the alarm confirmation and silencing functions and the test light function are input via button inputs of corresponding switch input signals DI1 and DI2. Alarm signals DI3 and DI4 are switch input signals output from the threshold comparison module to the logic array unit when the monitored parameters exceed a threshold. Among them, alarm signals DI3 and DI4 are redundant monitoring signals with the same parameter. Nuclear facility buildings monitor a large number of parameters (i.e., safety-level measuring points), but the surface resources of the safety-level control panel are limited. Compared to relay alarm circuits, the logic array unit in this embodiment modularly integrates alarm functions, alarm confirmation and silencing functions, and test light functions. It has advantages such as small size, low power consumption, saving installation and commissioning time, and facilitating system integration, installation, commissioning, and maintenance.

[0057] The truth table of the input and output logic function circuits corresponding to the implementation of the first logic expression function by the logic array unit in this embodiment is shown in Table 1. Different logic circuits that meet the requirements can be designed according to Table 1.

[0058] Table 1 Truth Table for Input / Output Logic Function Circuits

[0059]

[0060]

[0061] As shown in Table 1, for example, in serial number 2, when the alarm confirmation and mute buttons are not triggered, i.e. The state of Y1 is 1, DI3 has no alarm signal (i.e., C is 0), DI4 has an alarm signal (i.e., D is 1). According to the expression of Y1, the output state of Y1 is 1, meaning the speaker emits an alarm sound. Based on the first logical expression, the following functions are specifically implemented:

[0062] (1) When the DI1 alarm confirmation and mute button are not triggered, and either the DI3 or DI4 input switch is closed to trigger the alarm, the DO1 output interface will be closed, and the horn (i.e. loudspeaker) will be driven by the external power supply circuit to provide an alarm prompt.

[0063] (2) When DI2 test light button is pressed and DI3 has no alarm signal, or DI1 alarm confirmation and mute button is in the triggered state and DI3 has an alarm signal, DO2 output interface will be closed, and the alarm light will be driven to be long on by the external power supply circuit.

[0064] (3) When DI2 test light button is pressed and DI4 has no alarm signal, or DI1 alarm confirmation and mute button is in the triggered state and DI4 has an alarm signal, DO3 output interface will be closed, and the alarm light will be driven to be long on by the external power supply circuit.

[0065] (4) When DI3 has an alarm signal and DI1 alarm confirmation and mute button is not triggered, DO2 is in a periodic on-off state, and the alarm light is driven to flash by the external power supply circuit.

[0066] (5) When DI4 has an alarm signal and DI1 alarm confirmation and mute button is not triggered, DO3 is in a periodic on-off state, and the alarm light is driven to flash by the external power supply circuit.

[0067] Optionally, as Figure 1As shown, the logic array unit includes a first DQ flip-flop, a second DQ flip-flop, a square wave generator unit, a plurality of logic AND gates, a plurality of logic NOT gates, and a plurality of logic OR gates. The input end of the first DQ flip-flop receives the alarm confirmation and muting signal DI1, the inverting output end of the first DQ flip-flop is connected to the logic AND gate 8H, the alarm signal DI3 is connected to the logic AND gate 8H and the clear input end of the first DQ flip-flop, at the same time, the input end of the second DQ flip-flop receives the alarm confirmation and muting signal DI1, the inverting output end of the second DQ flip-flop is connected to the logic AND gate 8G, the alarm signal DI4 is connected to the logic AND gate 8G and the clear input end of the second DQ flip-flop, the output ends of the logic AND gate 8H and the logic AND gate 8G are both connected to the logic OR gate 12E, the logic OR gate 12E outputs the alarm sound signal DO1, which is used to realize the alarm function, the alarm confirmation and muting function. The input end of the logic AND gate 8E receives the test light signal DI2, the input end of the logic AND gate 8E is also connected to the output end of the logic NOT gate 5E, the input end of the logic NOT gate 5E receives the alarm signal DI3, the non-inverting output end of the first DQ flip-flop and the output end of the square wave generator unit are both connected to the logic OR gate 9E, the output end of the logic OR gate 9E and the alarm signal DI3 are both connected to the logic AND gate 11H, the logic AND gate 11H and the logic AND gate 8E are both connected to the input end of the logic OR gate 9H, the logic OR gate 9H outputs the light signal DO2, which is used to realize the test light function, the alarm confirmation and muting function, and the alarm output frequency adjustable function. The input end of the logic AND gate 8F receives the test light signal DI2, the input end of the logic AND gate 8F is also connected to the output end of the logic NOT gate 5F, the input end of the logic NOT gate 5F receives the alarm signal DI4, the non-inverting output end of the second DQ flip-flop and the output end of the square wave generator unit are both connected to the logic OR gate 9F, the output end of the logic OR gate 9F and the alarm signal DI4 are both connected to the logic AND gate 11G, the logic AND gate 11G and the logic AND gate 8F are both connected to the input end of the logic OR gate 9G, the logic OR gate 9G outputs the light signal DO3, which is used to realize the test light function, the alarm confirmation and muting function.

[0068] In this embodiment, based on the logic circuit diagram composed of the square wave generator unit, a plurality of DQ flip-flops, a plurality of logic AND gates, a plurality of logic NOT gates, and a plurality of logic OR gates, the first logic expression function is realized. For example, according to the requirement, four-way switch quantity input signals are input: the alarm confirmation and muting signal DI1 (momentary signal), the test light signal DI2 (long signal), and the alarm signals DI3 and DI4. The input signals enter the logic array for combined logic, and the logic result after the combined operation is output in the form of controlling three-way relay switches, wherein the alarm signal DI3 corresponds to the DO2 output, the alarm signal DI4 corresponds to the DO3 output, and the functions are as follows:

[0069] The alarm silencing function, when the alarm signal of DI3 is generated, DO2 will flicker and DO1 output signal drives the horn alarm; when the alarm signal of DI4 is generated, DO3 will flicker and DO1 output signal drives the horn alarm. When DI3, DI4 has alarm signal and DI1 alarm confirmation and silencing button is pressed to trigger the silencing state, the DO2, DO3 output signal of the alarm module drives the alarm lamp from flickering to long light, and DO1 interface output signal makes the horn silencing. When DI3, DI4 alarm signal disappears, the DO2, DO3 interface output signal of the alarm module drives the alarm lamp to extinguish. The test lamp function, when DI2 test lamp button is pressed and DI3 has no alarm signal, or DI1 alarm confirmation and silencing button is in the trigger state and DI3 has alarm signal, DO2 output interface will be closed, and the alarm lamp is driven by the external power supply circuit to be long light. DI2 test lamp button is pressed and DI4 has no alarm signal, or DI1 alarm confirmation and silencing button is in the trigger state and DI4 has alarm signal, DO3 output interface will be closed, and the alarm lamp is driven by the external power supply circuit to be long light. The logic circuit of the logic array unit in the embodiment is realized by pure hardware logic, has the advantages of high reliability, modular composition, strong independence of each component, and has the functions of alarm, silencing, test lamp, simple structure, low cost, easy to realize, and has the characteristics of fast response, low power consumption, long service life, strong environmental adaptability.

[0070] Optionally, the logic array unit is also used to realize the following second logic expression function by the logic circuit:

[0071]

[0072] The second logic expression function includes a fault safety function, Y0 is a module fault.

[0073] In the embodiment, as a fault module of the safety level control system, the fault module should be able to detect and identify its own fault to improve the reliability of the fault module. By further designing the logic expression Y0 of the fault safety function, and realizing the first logic expression function and the second logic expression function based on the logic circuit, the fault module meets the alarm requirement and meets the reliability requirement of the safety level control system.

[0074] Optionally, the logic array unit further comprises a fail-safe function circuit. The fail-safe function circuit comprises a fault lamp, a plurality of logic NOT gates, a plurality of logic AND gates, and a plurality of logic OR gates. The positive output terminal of the first DQ flip-flop and the positive output terminal of the second DQ flip-flop are both connected to the logic OR gate 12F, the output terminal of the logic OR gate 12F is connected to the logic NOT gate 6H, the logic AND gate 16H, and the logic AND gate 11F, respectively; the output terminal of the logic NOT gate 6H is connected to the logic AND gate 14G and the logic AND gate 14H, respectively; the output terminal of the logic OR gate 12E is connected to the logic NOT gate 6E, the logic AND gate 16E, the logic AND gate 16F, the logic AND gate 11E, and the logic AND gate 18E, respectively; the output terminal of the logic NOT gate 6E is connected to the logic AND gate 14E and the logic AND gate 14F, respectively; the output terminal of the logic AND gate 14E is connected to the logic AND gate 14G; the alarm signal DI3 is connected to the logic NOT gate 6G and the logic AND gate 14E; the output terminal of the logic NOT gate 6G is connected to the logic AND gate 16G and the logic AND gate 16F, respectively; the alarm signal DI4 is connected to the logic NOT gate 6F and the logic AND gate 14F, respectively; the output terminal of the logic NOT gate 6F is connected to the logic AND gate 16E and the logic AND gate 11E, respectively; the output terminal of the logic AND gate 14F is connected to the logic AND gate 14H; the output terminal of the logic AND gate 16E is connected to the logic AND gate 16G; the output terminal of the logic AND gate 16F is connected to the logic AND gate 16H; the output terminal of the logic AND gate 11E is connected to the logic AND gate 11F. The output terminals of the logic AND gate 14G and the logic AND gate 14H are both connected to the logic OR gate 13E; the output terminals of the logic OR gate 13E and the logic AND gate 16G are both connected to the logic OR gate 13F; the output terminals of the logic OR gate 13F and the logic AND gate 16H are both connected to the logic OR gate 13G; the output terminals of the logic OR gate 13G and the logic AND gate 11F are both connected to the logic OR gate 13H; the output terminal of the logic OR gate 13H is connected to the fault lamp and the logic NOT gate 5G in sequence; the output terminal of the logic NOT gate 5G is connected to the logic AND gate 18E, the logic AND gate 18F, and the logic AND gate 18G, respectively; the output terminal of the logic OR gate 9H is connected to the logic AND gate 18F; the output terminal of the logic OR gate 9G is connected to the logic AND gate 18G; the logic AND gate 18E outputs the alarm sound signal DO1; the logic AND gate 18F outputs the lamp signal DO2; the logic AND gate 18G outputs the lamp signal DO3; and the fail-safe function circuit is used to realize the fail-safe function.

[0075] In this embodiment, based on the logic circuit for realizing the function of the first logic expression or Figure 1 , the fail-safe function circuit of this embodiment is added, as shown in Figure 2 , the fail-safe function circuit realizes the detection and identification of the following fault types:

[0076] 14G: When the DI3 receives the alarm signal, the user performs the DI1 alarm confirmation and mute operation before the alarm, and the fault lamp is on.

[0077] 14H: When DI4 receives the alarm signal, the user performs DI1 alarm confirmation and silencing operation, and the alarm is not reported. The fault light is on.

[0078] 16G: When no alarm signal is received from DI3 and DI4, DO1 alarm output is reported. The fault light is on.

[0079] 16H: When DI3 has no new fault, DO1 still has output after alarm confirmation and silencing. The fault light is on.

[0080] 11F: When DI4 has no new fault, DO1 still has output after alarm confirmation and silencing. The fault light is on.

[0081] Optionally, the square wave generator unit includes a crystal oscillator, a frequency divider, and a frequency modulation circuit. The input end of the frequency divider is connected in series with the crystal oscillator, and the frequency divider is used to divide the first frequency of the crystal oscillator to obtain a square wave signal of a second frequency and a preset amplitude. The frequency modulation circuit includes a rotary encoding switch, a counter, and a D flip-flop connected in series. The input end of the counter is connected with the output end of the frequency divider, and the frequency modulation circuit is used to adjust the period of the square wave signal to obtain square wave signals of different frequencies, thereby realizing the adjustable alarm output frequency function.

[0082] In this embodiment, the adjustable alarm output frequency function refers to adjusting the frequency of the sound or light flicker emitted by the alarm according to the needs to adapt to the alarm requirements in different environments or situations, thereby improving the applicability and practicality of the alarm. When there is an alarm signal and the alarm confirmation and silencing buttons are not triggered, DO2 and DO3 are periodic switching signals, and the logic driving signal of the previous stage is a square wave signal with a duty cycle of 50%. When the period of the square wave signal is adjusted, the adjustable alarm output frequency function can be realized. Figure 3 As shown in the figure, a 32768Hz crystal oscillator is used to obtain a square wave signal with a frequency of 2Hz and an amplitude of 5V after being divided by 14 by the frequency divider. The square wave signal is then passed through the frequency modulation circuit composed of a counter, a D flip-flop, and a sixteen-step binary dial switch (installed on the front panel of the fault module) to realize fifteen-step adjustment of the signal period from 1s to 15s, meeting the requirement of ten-step adjustment from 1s to 10s.

[0083] Optionally, the logic circuit between the alarm confirmation and silencing signal and the alarm signal of the logic array unit is as shown in the figure. Figure 4As shown, the logic array unit includes a first DQ flip-flop, a second DQ flip-flop and a logic NOR gate. The input terminals of the first DQ flip-flop and the second DQ flip-flop each receive the alarm confirmation and muting signal DI1, the alarm signal DI3 is connected to the clear input terminal of the first DQ flip-flop, the alarm signal DI4 is connected to the clear input terminal of the second DQ flip-flop, the non-inverted output terminals of the first DQ flip-flop and the second DQ flip-flop are each connected to the logic NOR gate, and the logic NOR gate is used to output the momentary trigger state A of the alarm confirmation and muting signal DI1. Two DQ flip-flops are used in this embodiment to improve the performance and reliability of the logic circuit, and to realize complex logic functions and data processing.

[0084] Optionally, the input unit includes four processing components, and the four processing components are respectively used to output one-way switch quantity input signals. The processing component includes a gas discharge tube, an optocoupler driving circuit, a Schmitt trigger, and an RC filter circuit. The switch quantity input signal is connected in series to the optocoupler driving circuit after being connected in parallel to the gas discharge tube, the output terminal of the optocoupler driving circuit is connected to the Schmitt trigger, the output terminal of the Schmitt trigger is connected to the RC filter circuit, and the RC filter circuit is used to output the switch quantity input signal.

[0085] In this embodiment, as shown in Figure 5 The input unit further includes an ESD, a DC / DC isolation voltage stabilizing power supply, and the input unit is composed of four identical switch quantity input signal processing circuits. The switch quantity input signal is connected in series to the optocoupler driving circuit, 5V direct current is supplied by the isolation voltage stabilizing power supply module, the one-way transmission principle of the optocoupler is used to realize electrical isolation, the Schmitt trigger is used to perform anti-jitter and reverse, and finally the output after the RC filter circuit is input to the logic array unit or the square wave generator unit.

[0086] Optionally, the alarm module further includes a power supply unit. The power supply unit is connected to the input unit and the logic array unit, and is used to provide power supply to the input unit and the logic array unit. The power supply unit includes a direct current power supply, an anti-surge and static electricity circuit, an anti-reverse connection circuit, an EMC filter, and an isolation voltage stabilizing power supply. The input terminal of the anti-surge and static electricity circuit is connected to the direct current power supply, and the output terminal thereof is connected to the input terminal of the anti-reverse connection circuit. The input terminal of the EMC filter is connected to the output terminal of the anti-reverse connection circuit, the output terminal of the EMC filter is connected to a plurality of parallel isolation voltage stabilizing power supplies, and the EMC filter is used to filter high-frequency interference and electromagnetic radiation. The output terminals of the plurality of isolation voltage stabilizing power supplies are respectively connected to the logic array unit and the input unit.

[0087] In this embodiment, as shown in Figure 6 The power supply unit supplies power to the input unit and the logic array unit, respectively. As shown in Figure 7As shown, the surge protection and static electricity circuit of the power supply unit is used to protect the circuit in the alarm module from the impact of sudden voltage fluctuations and static electricity interference. The reverse connection protection circuit is used to prevent the current in the circuit from causing damage when connected in reverse, which improves the reliability and life of the alarm module.

[0088] Optionally, as shown, Figure 8 The output unit includes three relays. The three relays are used to receive three control signals output by the logic array unit. The three control signals drive the mechanical relay contact to attract and open, and the output dry contact signal is divided into a long signal and a switching frequency signal. The period of the switching frequency signal can be adjusted by the code switch of the square wave generator unit.

[0089] Optionally, the alarm module is arranged in a structural shell as shown in Figure 9 The structural shell is installed on the guide rail, and the front layout diagram is as shown in Figure 10 The wiring diagram is as shown in Figure 11 As can be seen from Figures 10-11 The interfaces receiving input signals (DI1-DI4) and output interfaces (DO1-DO3) are evenly arranged at both ends of the shell, and the end where the output interfaces are arranged is also provided with a power input interface. Since the structural shell is firm and solid, the alarm module meets the anti-seismic class I requirements of GB 13625-2018 and HAF J0053-1995.

[0090] The alarm module of the nuclear facility safety level control system of the embodiment outputs a fault alarm control signal meeting the functions by designing a logic expression meeting the alarm function, alarm confirmation and silencing function, pilot lamp function and alarm output frequency adjustable function, and based on four-way switching quantity input signals and a logic circuit implementing the logic expression. Specifically, the number of parameters monitored by the nuclear facility plant is large, but the resource of the panel surface of the safety level control panel is limited. Compared with the relay alarm circuit, the logic array unit of the alarm module of the embodiment is more cost-effective in terms of hardware resources on the basis of meeting the alarm function, and has high integration and small size, so that the panel surface utilization rate is high. Further, the alarm module can detect and identify its own faults on the basis of implementing the alarm function, thereby improving the reliability of the fault module and meeting the reliability requirements of the safety level control system. In addition, the frequency of the fault module alarm display signal can be adjusted through the square wave generator unit, which can expand the application range of the fault module and meet more alarm requirements. Due to the high reliability requirements of the safety level control system, the alarm function cannot be realized by software control. In summary, the fault module of the embodiment is realized by pure hardware logic of the logic array unit, which has the advantages of high reliability compared with software control or relay circuit, and has the functions of alarm, alarm confirmation and silencing, pilot lamp, fault output frequency adjustable, fault safety, simple structure, low cost, easy implementation, fast response, low power consumption, long service life, strong environmental adaptability, thereby improving the safety of the nuclear facility.

[0091] Embodiment 2

[0092] As shown in Figure 12 The embodiment provides an alarm method of a nuclear facility safety level control system, applied to the alarm module of the nuclear facility safety level control system of embodiment 1, and the alarm method comprises the following steps.

[0093] Step 201, receiving four-way switching quantity input signals, wherein the four-way switching quantity input signals include alarm confirmation and silencing signals DI1, pilot lamp signals DI2, alarm signals DI3 and alarm signals DI4.

[0094] Step 202, implementing the following first logic expression function through a logic circuit to obtain three-way control signals,

[0095]

[0096] Wherein, the first logic expression function includes alarm function, alarm confirmation and silencing function, test light function, three-way control signal includes alarm sound signal DO1, light signal DO2 corresponding to alarm signal DI3, light signal DO3 corresponding to alarm signal DI4, A in the first logic expression is the instantaneous trigger state of alarm confirmation and silencing signal DI1, B is the input state of test light signal DI2, C is the input state of alarm signal DI3, D is the input state of alarm signal DI4, Y1 is the output state of alarm sound signal DO1, Y2 is the output state of light signal DO2, Y3 is the output state of light signal DO3, 1 of Y4 is the 0 / 1 state of light signal DO2, 1 of Y5 is the 0 / 1 state of light signal DO3, represents non-A, represents non-C, represents non-D.

[0097] Step 203, the three-way control signal is respectively passed through the circuit breaker to control the on-off of the external horn and light.

[0098] The logic circuit for realizing the first logic expression function comprises a logic array unit, the logic array unit comprising a first DQ flip-flop, a second DQ flip-flop, a square wave generator unit, a plurality of logic AND gates, a plurality of logic NOT gates and a plurality of logic OR gates. The input end of the first DQ flip-flop receives an alarm confirmation and muting signal DI1, the inverting output end of the first DQ flip-flop is connected to a logic AND gate 8H, an alarm signal DI3 is connected to the logic AND gate 8H and the clear input end of the first DQ flip-flop, at the same time, the input end of the second DQ flip-flop receives the alarm confirmation and muting signal DI1, the inverting output end of the second DQ flip-flop is connected to a logic AND gate 8G, an alarm signal DI4 is connected to the logic AND gate 8G and the clear input end of the second DQ flip-flop, the output ends of the logic AND gate 8H and the logic AND gate 8G are both connected to a logic OR gate 12E, the logic OR gate 12E outputs an alarm sound signal DO1, which is used to realize the alarm function, the alarm confirmation and muting function. The input end of a logic AND gate 8E receives a test light signal DI2, the input end of the logic AND gate 8E is also connected to the output end of a logic NOT gate 5E, the input end of the logic NOT gate 5E receives the alarm signal DI3, the non-inverting output end of the first DQ flip-flop and the output end of the square wave generator unit are both connected to a logic OR gate 9E, the output end of the logic OR gate 9E and the alarm signal DI3 are both connected to a logic AND gate 11H, the logic AND gate 11H and the logic AND gate 8E are both connected to the input end of a logic OR gate 9H, the logic OR gate 9H outputs a light signal DO2, which is used to realize the test light function, the alarm confirmation and muting function and the alarm output frequency adjustable function. The input end of a logic AND gate 8F receives the test light signal DI2, the input end of the logic AND gate 8F is also connected to the output end of a logic NOT gate 5F, the input end of the logic NOT gate 5F receives the alarm signal DI4, the non-inverting output end of the second DQ flip-flop and the output end of the square wave generator unit are both connected to a logic OR gate 9F, the output end of the logic OR gate 9F and the alarm signal DI4 are both connected to a logic AND gate 11G, the logic AND gate 11G and the logic AND gate 8F are both connected to the input end of a logic OR gate 9G, the logic OR gate 9G outputs a light signal DO3, which is used to realize the test light function, the alarm confirmation and muting function and the alarm output frequency adjustable function.

[0099] Optionally, after step 202 and before step 203, the method further comprises: realizing, by a logic circuit, a second logic expression function as follows:

[0100]

[0101] The second logic expression function comprises a failsafe function, Y0 is a module fault.

[0102] The logic circuit for realizing the second logic expression function comprises a failsafe function circuit. The failsafe function circuit comprises a fault light, a plurality of logic NOT gates, a plurality of logic AND gates and a plurality of logic OR gates.

[0103] The positive output end of the first DQ flip-flop and the positive output end of the second DQ flip-flop are connected to a logic OR gate 12F, the output end of the logic OR gate 12F is connected to a logic NOT gate 6H, a logic AND gate 16H and a logic AND gate 11F respectively, the output end of the logic NOT gate 6H is connected to a logic AND gate 14G and a logic AND gate 14H respectively, the output end of the logic OR gate 12E is connected to a logic NOT gate 6E, a logic AND gate 16E, a logic AND gate 16F, a logic AND gate 11E and a logic AND gate 18E respectively, the output end of the logic NOT gate 6E is connected to a logic AND gate 14E and a logic AND gate 14F respectively, the output end of the logic AND gate 14E is connected to a logic AND gate 14G, the alarm signal DI3 is connected to a logic NOT gate 6G and a logic AND gate 14E respectively, the output end of the logic NOT gate 6G is connected to a logic AND gate 16G and a logic AND gate 16F respectively, the alarm signal DI4 is connected to a logic NOT gate 6F and a logic AND gate 14F respectively, the output end of the logic NOT gate 6F is connected to a logic AND gate 16E and a logic AND gate 11E respectively, the output end of the logic AND gate 14F is connected to a logic AND gate 14H, the output end of the logic AND gate 16E is connected to a logic AND gate 16G, the output end of the logic AND gate 16F is connected to a logic AND gate 16H, and the output end of the logic AND gate 11E is connected to a logic AND gate 11F. The output ends of the logic AND gate 14G and the logic AND gate 14H are connected to a logic OR gate 13E, the output ends of the logic OR gate 13E and the logic AND gate 16G are connected to a logic OR gate 13F, the output ends of the logic OR gate 13F and the logic AND gate 16H are connected to a logic OR gate 13G, the output ends of the logic OR gate 13G and the logic AND gate 11F are connected to a logic OR gate 13H, and the output end of the logic OR gate 13H is connected to a fault light and a logic NOT gate 5G in sequence, the output end of the logic NOT gate 5G is connected to a logic AND gate 18E, a logic AND gate 18F and a logic AND gate 18G respectively, the output end of the logic OR gate 9H is connected to a logic AND gate 18F, the output end of the logic OR gate 9G is connected to a logic AND gate 18G, the logic AND gate 18E outputs an alarm sound signal DO1, the logic AND gate 18F outputs a light signal DO2, the logic AND gate 18G outputs a light signal DO3, and the fault safety function circuit is used to realize the fault safety function.

[0104] The square wave generator unit comprises a crystal oscillator, a frequency divider and a frequency modulation circuit. The input end of the frequency divider is connected in series with the crystal oscillator, and the frequency divider is used to divide the frequency of the crystal oscillator to obtain a square wave signal with a second frequency and a preset amplitude. The frequency modulation circuit comprises a rotary encoding switch, a counter and a D flip-flop connected in series. The input end of the counter is connected to the output end of the frequency divider. The frequency modulation circuit is used to adjust the period of the square wave signal to obtain square wave signals with different frequencies, thereby realizing the function of adjustable alarm output frequency.

[0105] The logic array unit comprises a first DQ flip-flop, a second DQ flip-flop and a logic NOR gate. The input terminals of the first DQ flip-flop and the second DQ flip-flop receive the alarm confirmation and muting signal DI1, the alarm signal DI3 is connected to the clear input terminal of the first DQ flip-flop, the alarm signal DI4 is connected to the clear input terminal of the second DQ flip-flop, the non-inverted output terminals of the first DQ flip-flop and the second DQ flip-flop are connected to the logic NOR gate, and the logic NOR gate is used to output the momentary trigger state A of the alarm confirmation and muting signal DI1.

[0106] Embodiment 3

[0107] As shown in Figure 13 , the embodiment provides a nuclear facility safety level control system, which comprises a safety level control panel and the alarm module of the nuclear facility safety level control system as described in Embodiment 1.

[0108] The input terminal of the alarm module of the nuclear facility safety level control system is connected to the panel button and the threshold comparison module of the safety level control panel, and the output terminal is connected to the horn and the lamp of the safety level control panel. The alarm module is used to receive the on-off input signal of the safety level control panel and output the corresponding fault alarm control signal.

[0109] In the embodiment, the alarm confirmation and muting signal DI1 and the pilot lamp signal DI2 (i.e. the signals generated by the two panel buttons as shown in Figure 13 ) are on-off input signals shared by multiple alarm modules, and the alarm sound signal DO1 (i.e. the sound generated by the horn of the panel as shown in Figure 13 ) is a control signal shared by multiple alarm modules. The alarm signal DI3 and the alarm signal DI4 are redundant signals corresponding to one safety level measurement point, and the lamp signal DO2 and the lamp signal DO3 (i.e. the two lamps of the panel as shown in Figure 13 ) are fault lamp signals corresponding to one safety level measurement point.

[0110] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered to be within the protection scope of the present application.

Claims

1. An alarm module for a nuclear facility safety level control system, characterized in that, Includes input units, logic array units, and output units. The input unit, connected to the logic array unit, is used to output four digital input signals to the logic array unit. These four digital input signals include an alarm confirmation and mute signal DI1, a lamp test signal DI2, an alarm signal DI3, and an alarm signal DI4. The logic array unit is used to implement the following first logic expression function through pure hardware logic circuitry and output three control signals. ， The first logical expression includes functions for alarm, alarm confirmation and silencing, and lamp testing. The three control signals include an alarm sound signal DO1, a lamp signal DO2 corresponding to alarm signal DI3, and a lamp signal DO3 corresponding to alarm signal DI4. The first logical expression contains... A For the instantaneous triggering state of alarm confirmation and silencing signal DI1, B This refers to the input state of the test lamp signal DI2. C This refers to the input status of alarm signal DI3. D This refers to the input status of alarm signal DI4. Y 1 indicates the output status of the alarm sound signal DO1. Y 2 represents the output state of lamp signal DO2. Y 3 indicates the output status of lamp signal DO3. Y The 1 in 4 represents the 0 / 1 state of the lamp signal DO2. Y The 1 in 5 represents the 0 / 1 state of lamp signal DO3. Indicates non A , Indicates non C , Indicates non D The pure hardware logic circuit does not contain relays. The output unit, connected to the logic array unit, is used to receive three control signals and control the circuit switching of external speakers and lights through a circuit breaker.

2. The alarm module of the nuclear facility safety level control system according to claim 1, characterized in that, The logic array unit includes a first DQ flip-flop, a second DQ flip-flop, a square wave generator unit, several AND gates, several NOT gates, and several OR gates. The input of the first DQ flip-flop receives the alarm confirmation and mute signal DI1. The inverted output of the first DQ flip-flop is connected to AND gate 8H. The alarm signal DI3 is connected to AND gate 8H and the reset input of the first DQ flip-flop. Simultaneously, the input of the second DQ flip-flop receives the alarm confirmation and mute signal DI1. The inverted output of the second DQ flip-flop is connected to AND gate 8G. The alarm signal DI4 is connected to AND gate 8G and the reset input of the second DQ flip-flop. The outputs of both AND gates 8H and 8G are connected to OR gate 12E. OR gate 12E outputs the alarm sound signal DO1, used to implement the alarm function, alarm confirmation function, and mute function. The input of AND gate 8E receives the test lamp signal DI2. The input of AND gate 8E is also connected to the output of NOT gate 5E. The input of NOT gate 5E receives the alarm signal DI3. The positive output of the first DQ flip-flop and the output of the square wave generator unit are both connected to OR gate 9E. The output of OR gate 9E and the alarm signal DI3 are both connected to AND gate 11H. AND gate 11H and AND gate 8E are both connected to the input of OR gate 9H. OR gate 9H outputs the lamp signal DO2, used to implement the test lamp function, alarm confirmation, and silencing function. The input of AND gate 8F receives the test lamp signal DI2. The input of AND gate 8F is also connected to the output of NOT gate 5F. The input of NOT gate 5F receives the alarm signal DI4. The positive output of the second DQ flip-flop and the output of the square wave generator unit are both connected to OR gate 9F. The output of OR gate 9F and the alarm signal DI4 are both connected to AND gate 11G. AND gate 11G and AND gate 8F are both connected to the input of OR gate 9G. OR gate 9G outputs the lamp signal DO3, which is used to realize the test lamp function, alarm confirmation and silencing function.

3. The alarm module of the nuclear facility safety level control system according to claim 2, characterized in that, The logic array unit is also used to implement the following second logic expression function through logic circuits: Y 0= + + + ， The second logical expression includes a fail-safe function. Y 0 indicates a module failure.

4. The alarm module of the nuclear facility safety level control system according to claim 3, characterized in that, The logic array unit also includes fail-safe function circuitry. The fail-safe circuit includes a fault indicator, several NOT gates, several AND gates, and several OR gates. The non-inverting outputs of both the first and second DQ flip-flops are connected to an OR gate 12F. The outputs of the OR gate 12F are connected to NOT gate 6H, AND gate 16H, and AND gate 11F, respectively. The outputs of NOT gate 6H are connected to AND gates 14G and 14H, respectively. The outputs of the OR gate 12E are connected to NOT gate 6E, AND gate 16E, AND gate 16F, AND gate 11E, and AND gate 18E, respectively. The outputs of NOT gate 6E are connected to AND gates 14E and 14F, respectively. The output of AND gate 14E is connected to... The output of AND gate 14G and alarm signal DI3 are connected to NOT gate 6G and AND gate 14E respectively. The output of NOT gate 6G is connected to AND gate 16G and AND gate 16F respectively. Alarm signal DI4 is connected to NOT gate 6F and AND gate 14F respectively. The output of NOT gate 6F is connected to AND gate 16E and AND gate 11E respectively. The output of AND gate 14F is connected to AND gate 14H. The output of AND gate 16E is connected to AND gate 16G. The output of AND gate 16F is connected to AND gate 16H. The output of AND gate 11E is connected to AND gate 11F. The outputs of AND gates 14G and 14H are both connected to OR gate 13E. The outputs of OR gates 13E and 16G are both connected to OR gate 13F. The outputs of OR gates 13F and 16H are both connected to OR gate 13G. The outputs of OR gates 13G and 11F are both connected to OR gate 13H. The output of OR gate 13H is sequentially connected to a fault light and NOT gate 5G. The output of NOT gate 5G is connected to AND gates 18E, 18F, and 18G respectively. The output of OR gate 9H is connected to AND gate 18F. The output of OR gate 9G is connected to AND gate 18G. AND gate 18E outputs an alarm sound signal DO1. AND gate 18F outputs a light signal DO2. AND gate 18G outputs a light signal DO3. The fail-safe function circuit is used to implement the fail-safe function.

5. The alarm module of the nuclear facility safety level control system according to claim 2, characterized in that, The square wave generator unit includes a crystal oscillator, a frequency divider, and a frequency modulation circuit. The input of the frequency divider is connected in series with the crystal oscillator. The frequency divider is used to divide the first frequency of the crystal oscillator to obtain a square wave signal with a second frequency and a preset amplitude. The frequency modulation circuit includes a rotary encoder switch, a counter, and a D flip-flop connected in series. The input of the counter is connected to the output of the frequency divider. The frequency modulation circuit is used to adjust the period of the square wave signal to achieve an adjustable alarm output frequency.

6. The alarm module of the nuclear facility safety level control system according to claim 1, characterized in that, The logic array unit includes a first DQ flip-flop, a second DQ flip-flop, and a logic NOR gate. Both the first and second DQ flip-flops receive alarm confirmation and mute signals DI1 at their inputs. Alarm signal DI3 is connected to the reset input of the first DQ flip-flop, and alarm signal DI4 is connected to the reset input of the second DQ flip-flop. The positive outputs of both the first and second DQ flip-flops are connected to a NOR gate, which is used to output the instantaneous trigger state of the alarm confirmation and mute signals DI1. A .

7. The alarm module of the nuclear facility safety level control system according to claim 1, characterized in that, The input unit includes four processing components, each of which is used to output a single digital input signal. The processing components include a gas discharge tube, an optocoupler drive circuit, a Schmitt trigger, and an RC filter circuit. The digital input signal is connected in parallel with the gas discharge tube and then in series with the optocoupler drive circuit. The output of the optocoupler drive circuit is connected to the Schmitt trigger, and the output of the Schmitt trigger is connected to the RC filter circuit. The RC filter circuit is used to output the digital input signal.

8. The alarm module of the nuclear facility safety level control system according to claim 1, characterized in that, It also includes a power supply unit, The power supply unit is connected to the input unit and the logic array unit respectively, and is used to provide power to the input unit and the logic array unit. The power supply unit includes a DC power supply, surge and ESD protection circuits, reverse connection protection circuits, an EMC filter, and an isolated regulated power supply. The input terminal of the surge protection and electrostatic discharge protection circuit is connected to the DC power supply, and its output terminal is connected to the input terminal of the reverse connection protection circuit. The input terminal of the EMC filter is connected to the output terminal of the reverse connection protection circuit, and the output terminal of the EMC filter is connected to several parallel isolated regulated power supplies. The EMC filter is used to filter high-frequency interference and electromagnetic radiation. The output terminals of several isolated regulated power supplies are respectively connected to the logic array unit and the input unit.

9. The alarm module of the nuclear facility safety level control system according to claim 1, characterized in that, The output unit includes three relays. The three relays are used to receive the three control signals output by the logic array unit.

10. An alarm method for a nuclear facility safety level control system, characterized in that, include: It receives four digital input signals, including alarm confirmation and mute signal DI1, lamp test signal DI2, alarm signal DI3 and alarm signal DI4. The following first logic expression is implemented using pure hardware logic circuitry to obtain three control signals. ， The first logical expression includes functions for alarm, alarm confirmation and silencing, and lamp testing. The three control signals include an alarm sound signal DO1, a lamp signal DO2 corresponding to alarm signal DI3, and a lamp signal DO3 corresponding to alarm signal DI4. The first logical expression contains... A For the instantaneous triggering state of alarm confirmation and silencing signal DI1, B This refers to the input state of the test lamp signal DI2. C This refers to the input status of alarm signal DI3. D This refers to the input status of alarm signal DI4. Y 1 indicates the output status of the alarm sound signal DO1. Y 2 represents the output state of lamp signal DO2. Y 3 indicates the output status of lamp signal DO3. Y The 1 in 4 represents the 0 / 1 state of the lamp signal DO2. Y The 1 in 5 represents the 0 / 1 state of lamp signal DO3. Indicates non A , Indicates non C , Indicates non D The pure hardware logic circuit does not contain relays; The three control signals are used to control the on / off of the external horn and light circuits via circuit breakers.

11. A nuclear facility safety level control system, characterized in that, Includes a safety-level control panel, a threshold comparison module, and an alarm module for the nuclear facility safety-level control system as described in any one of claims 1-9. The safety-grade control panel is equipped with panel buttons, a horn, and lights. The input terminal of the alarm module of the nuclear facility safety level control system is connected to the threshold comparison module and the panel buttons of the safety level control panel, and its output terminal is connected to the horn and lights of the safety level control panel. The alarm module is used to receive switch input signals from the safety control panel and threshold comparison module, and output corresponding fault alarm control signals.

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