Nuclear power plant nuclear power trigger shutdown control system
By optimizing the processor internal computing logic to combine the bypass and fault status of different channels, the malfunction rate of the nuclear power trigger protection shutdown device of the nuclear power plant is reduced, the problem of unanticipated shutdown of reactors is solved, and the operating efficiency of the nuclear power plant is improved. .
Patent Information
- Application Number
- CN202323661545.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-29
AI Technical Summary
The nuclear power trigger protection shutdown device of existing nuclear power plants has a high malfunction rate, resulting in an unexpected shutdown of reactors and causing economic losses to nuclear power plants.
Design a nuclear power trigger shutdown control system for nuclear power plants, including on-site signal acquisition module, control panel module, first channel control module, second channel signal output module and power supply module. By optimizing the processor's internal computing logic, different channels are transferred The bypass state and fault state are logically combined to avoid the failure of a single device directly causing a shutdown protection signal.
Reduces the risk of accidental contact of nuclear power-triggered shutdown protection signals due to failure of a single component, and improves the operating reliability and overall operating efficiency of the reactor.
Smart Images
Figure CN222145808U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of nuclear power plant automatic control, in particular to a nuclear power plant nuclear power triggering shutdown control system. Background Art
[0002] As part of the safety shutdown protection, the control method and device of nuclear power plant related to nuclear power triggering shutdown protection are directly related to nuclear safety. Its function is to make threshold and logical judgment on the current nuclear power by collecting relevant operating parameters in the core. When the relevant operating parameters in the core exceed the set value, it may endanger the integrity of the three major barriers of the nuclear power plant, so an emergency shutdown signal will be issued, and the safety dedicated drive system will be started when necessary. Taking a new type of nuclear power plant as an example, in order to ensure the safety of the nuclear power plant, the intermediate nuclear power triggering protection shutdown device of the nuclear power plant adopts a redundant design of two columns of channels A and B, and takes 1 out of 2 for the signals of the two columns of channels, and outputs the shutdown alarm signal after logical operation. Although this design plays a role in protecting the three major barriers of the nuclear power plant, it was found during the daily operation and regular tests of the nuclear power plant that when the signal is not bypassed and exited, any of the conditions of high nuclear power, quality position failure, and measurement device failure in any column of the channel in the device will generate an accident alarm signal and trigger the shutdown signal. When the nuclear power operating parameters are normal, the current design leads to a high false triggering rate of nuclear power related shutdown signals, which will cause unexpected shutdown of the nuclear power plant and cause great economic losses to the nuclear power plant.
[0003] The existing patent CN110415850A discloses a design method for reducing the false operation rate of the reactor protection system. The digital instrumentation and control system has three protection channels: the first protection channel, the second protection channel, and the third protection channel; the first protection channel and the second protection channel are equipped with sensors to collect signals. The method includes: after the sensors in the first protection channel and the second protection channel collect signals, the signals are transmitted to the collection and operation units in their respective protection channels respectively; at the same time, the signals collected by the sensors in the first protection channel and the second protection channel are transmitted to the collection and operation unit in the third protection channel; the collection and operation unit in the third protection channel first screens the received signals, and then performs fixed value comparison processing on the screened signals; the collection and operation units in the first protection channel and the second protection channel respectively perform fixed value comparison processing on the received signals; the signals after the fixed value comparison processing of the three collection and operation units are processed by three-out-of-two logic operation, and the final protection action signal is generated and input into the reactor protection system. This scheme is a simple improvement on the 2-out-of-1 operation logic, and there is still a high false trigger rate of nuclear power-related shutdown signals.
[0004] The existing patent CN111799008A discloses a method for a nuclear power plant to deal with a multi-channel liquid level signal failure of an evaporator. The method for a nuclear power plant to deal with a multi-channel liquid level signal failure of an evaporator is as follows: generating an evaporator liquid level failure signal; generating an evaporator liquid level failure total signal; generating a hot section temperature less than a set limit signal; generating a cooling mode signal; performing an AND operation on the hot section temperature less than a set limit signal and the cooling mode signal to generate a cooling lock signal; performing a lock operation on the evaporator liquid level failure total signal through the lock logic and the cooling lock signal to generate an evaporator liquid level failure shutdown signal; the evaporator liquid level failure shutdown signal and other shutdown signals generate a total shutdown signal to execute the shutdown. This solution focuses on solving the problem of the reactor unit being falsely triggered shutdown protection due to inaccurate judgment of the evaporator liquid level signal failure, but does not solve the problem of a high false operation rate of the nuclear power plant nuclear power triggering protection shutdown device caused by the alarm signal generated by the nuclear measurement device failure, nuclear power, etc. in the prior art.
[0005] Based on the above technical problems, the present utility model is hereby proposed. Summary of the invention
[0006] Based on the above technical problems, the utility model proposes a nuclear power plant nuclear power triggered shutdown control system to solve the problem of high misoperation rate of nuclear power plant nuclear power triggered protection shutdown device and the resulting unexpected shutdown of the reactor in the prior art.
[0007] In order to achieve the above-mentioned purpose, the utility model proposes a nuclear power plant nuclear power triggered shutdown control system.
[0008] A nuclear power plant nuclear power triggered shutdown control system, comprising: a field signal acquisition module, a control panel module, a first channel control module, a second channel signal output module and a power supply module,
[0009] The first channel control module includes a plurality of switch input units DI, an analog input unit AI, a switch output unit DO, a processor MPU and a communication unit;
[0010] The analog input unit AI and the first switch input unit DI are used to respectively receive sensor signals collected by the field signal collection module;
[0011] The second switch input unit DI and the third switch input unit DI are used to receive input signals from the control panel module;
[0012] The fourth switch value input unit DI to the seventh switch value input unit DI are used to respectively receive the output signals of the second channel signal output module through the communication unit;
[0013] The eighth switch input unit DI is used to receive a locking signal through the communication unit;
[0014] The processor MPU is used to perform logic operations on the sensor signal, the input signal from the control panel module, the output signal of the second channel signal output module, and the locking signal to generate a logic operation result;
[0015] The switch output unit DO is used to output the result of logic operation;
[0016] The power supply module is used to supply power to the first channel control module.
[0017] Furthermore, the system also includes a conditioning module, which is used to convert the sensor signal into an analog input signal and a digital input signal, and send the analog input signal and the digital input signal to the analog input unit AI and the first switch input unit DI respectively.
[0018] Further, the sensor signal includes a first channel mid-range nuclear power signal and a first channel mid-range nuclear measuring device fault signal.
[0019] Further, the first channel mid-range nuclear power signal and the first channel mid-range nuclear measurement device fault signal both include first channel quality bit information.
[0020] Furthermore, the input signal sent by the control panel module includes: a first channel mid-range nuclear measuring device bypass signal and a first channel bypass signal.
[0021] Furthermore, the output signal of the second channel signal output module includes: a second channel bypass signal, a second channel mid-range nuclear measurement device fault signal, a second channel quality position fault signal and a second channel mid-range nuclear power high signal.
[0022] Furthermore, the processor MPU includes a threshold judgment unit, thirteen AND gates and two OR gates.
[0023] The threshold judgment unit is connected to the analog input unit AI, and is used to receive the first channel intermediate range nuclear power signal output by the analog input unit AI, and perform threshold judgment on the above signal, and output the threshold judgment result;
[0024] The first AND gate is connected to the threshold judgment unit, and is used to receive the threshold judgment result and the first channel intermediate range nuclear measurement device fault signal output by the first switch input unit DI, and perform an AND operation on the above signals to output a first operation result;
[0025] The second AND gate is connected to the first AND gate and the second switch input unit DI respectively, and is used to receive the first operation result of the first AND gate and the first channel intermediate range nuclear measurement device bypass signal output by the second switch input unit DI, and perform an AND operation on the above signals to output a second operation result;
[0026] The third AND gate is connected to the second AND gate and the third switch input unit DI respectively, and is used to receive the second operation result of the second AND gate and the negation of the first channel bypass signal output by the third switch input unit DI, and perform an AND operation on the above signals to output a third operation result;
[0027] The first OR gate is connected to the analog input unit AI, the first switch input unit DI and the second switch input unit DI respectively, and is used to receive the first channel quality bit signal output by the analog input unit AI and the first switch input unit DI and the first channel intermediate range nuclear measurement device bypass signal output by the second switch input unit DI, and perform an OR operation on the above signals to output a fourth operation result;
[0028] The fourth AND gate is connected to the first OR gate and the third switch input unit DI respectively, and is used to receive the fourth operation result output by the first OR gate and the negation of the first channel bypass signal output by the third switch input unit DI, and perform an AND operation on the above signals to output a fifth operation result;
[0029] The fifth AND gate is connected to the first switch input unit DI and the third switch input unit DI respectively, and is used to receive the negation of the first channel intermediate range nuclear measurement device fault signal output by the first switch input unit DI and the negation of the first channel bypass signal output by the third switch input unit DI, and perform an AND operation on the above signals to output a sixth operation result;
[0030] The sixth AND gate is connected to the fourth switch input unit DI and the fifth switch input unit DI respectively, and is used to receive the negation of the second channel bypass signal output by the fourth switch input unit DI and the negation of the second channel intermediate range nuclear measurement device fault signal output by the fifth switch input unit DI, and perform an AND operation on the above signals to output a seventh operation result;
[0031] The seventh AND gate is connected to the fourth switch input unit DI and the sixth switch input unit DI respectively, and is used to receive the negation of the second channel bypass signal output by the fourth switch input unit DI and the second channel quality bit fault signal output by the sixth switch input unit DI, and perform an AND operation on the above signals to output an eighth operation result;
[0032] The eighth AND gate is connected to the fourth switch input unit DI and the seventh switch input unit DI respectively, and is used to receive the negation of the second channel bypass signal output by the fourth switch input unit DI and the second channel intermediate range core power high signal output by the seventh switch input unit DI, and perform an AND operation on the above signals to output a ninth operation result;
[0033] The ninth AND gate is connected to the fifth AND gate and the sixth AND gate respectively, and is used to receive the sixth operation result output by the fifth AND gate and the seventh operation result output by the sixth AND gate, and perform an AND operation on the above signals to output a tenth operation result;
[0034] The tenth AND gate is connected to the fourth AND gate and the seventh AND gate respectively, and is used to receive the fifth operation result output by the fourth AND gate and the eighth operation result output by the seventh AND gate, and perform an AND operation on the above signals to output an eleventh operation result;
[0035] The eleventh AND gate is connected to the fourth AND gate and the sixth AND gate respectively, and is used to receive the fifth operation result output by the fourth AND gate and the seventh operation result output by the sixth AND gate, and perform an AND operation on the above signals to output a twelfth operation result;
[0036] The twelfth AND gate is connected to the fifth AND gate and the seventh AND gate respectively, and is used to receive the sixth operation result output by the fifth AND gate and the eighth operation result output by the seventh AND gate, and perform an AND operation on the above signals to output a thirteenth operation result;
[0037] The second OR gate is connected to the third AND gate, the tenth AND gate, the ninth AND gate, the eleventh AND gate, the twelfth AND gate and the eighth AND gate respectively, and is used to receive the output results of the third AND gate, the tenth AND gate, the ninth AND gate, the eleventh AND gate, the twelfth AND gate and the eighth AND gate, and perform an OR operation on the above signals to output a fourteenth operation result;
[0038] The thirteenth AND gate is connected to the second OR gate and the eighth switch input unit DI respectively, and is used to receive the negation of the fourteenth operation result output by the second OR gate and the locking signal output by the eighth switch input unit DI, and perform an AND operation on the above signals to output the fifteenth operation result.
[0039] Furthermore, the power supply module is configured with AC\DC redundancy, and 220VAC is converted into 24VDC to supply power to the first channel control module.
[0040] Based on the above technical solution, the utility model has at least the following beneficial effects:
[0041] 1. The utility model optimizes the internal operation logic of the processor and logically combines the bypass status and fault status of different channels, so that the fault signal of a single device will not directly cause the control system to output a shutdown protection signal, thereby reducing the risk of false triggering of the nuclear power shutdown protection signal due to the failure of a single component, solving the problem of unexpected shutdown of the reactor, and improving the overall operating efficiency of the nuclear power plant.
[0042] 2. While reducing the risk of accidental triggering of the nuclear power shutdown protection signal due to failure of a single component, the utility model can still ensure that the reactor emergency shutdown can be triggered when any channel normally sends a shutdown signal, and the reactor protection logic inside the control system has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0044] Figure 1 The present invention is a schematic diagram of a nuclear power plant nuclear power triggered shutdown control system according to an embodiment of the present invention.
[0045] The above drawings include the following reference numerals:
[0046] 100, on-site signal acquisition module; 200, control panel module; 300, first channel control module; 301, analog input unit AI; 302, first switch input unit DI; 303, second switch input unit DI; 304, third switch input unit DI; 305, fourth switch input unit DI; 306, fifth switch input unit DI; 307, sixth switch input unit DI; 308, seventh switch input unit DI; 309, eighth switch input unit DI; 310, threshold judgment unit; 311, threshold judgment unit; 312, threshold judgment unit; 313, threshold judgment unit; 314, threshold judgment unit; 315, threshold judgment unit; 316, threshold judgment unit; 317, threshold judgment unit; 318, threshold judgment unit; 319, threshold judgment unit; 320, threshold judgment unit; 321, threshold judgment unit; 322, threshold judgment unit; 323, threshold judgment unit; 324, threshold judgment unit; 325, threshold judgment unit; 326, threshold judgment unit; 327, threshold judgment unit; 328, threshold judgment unit; 329, threshold judgment unit; 330, threshold judgment unit; 331 1. First AND gate; 312. Second AND gate; 313. Third AND gate; 314. Fourth AND gate; 315. Fifth AND gate; 316. Sixth AND gate; 317. Seventh AND gate; 318. Eighth AND gate; 319. Ninth AND gate; 320. Tenth AND gate; 321. Eleventh AND gate; 322. Twelfth AND gate; 323. Second OR gate; 324. Thirteenth AND gate; 325. First OR gate; 330. Switch output unit DO; 340. Communication unit; 400. Second channel signal output module; 500. Power supply module; 600. Conditioning module. DETAILED DESCRIPTION
[0047] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0048] The present invention is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed for the present invention.
[0049] Example
[0050] In order to solve the problem of high misoperation rate of nuclear power plant nuclear power triggered protection shutdown device and the resulting unexpected shutdown of the reactor in the prior art, the utility model proposes a nuclear power plant nuclear power triggered shutdown control system.
[0051] like Figure 1 FIG. 1 shows a schematic diagram of a nuclear power plant nuclear power triggered shutdown control system according to an embodiment of the utility model. Figure 1 As shown, the control system includes: a field signal acquisition module 100, a control panel module 200, a first channel control module 300, a second channel signal output module 400 and a power supply module 500. Among them, channel A represents the first channel, and channel B represents the second channel.
[0052] like Figure 1 As shown, the first channel control module 300 includes eight switch input units DI, one analog input unit AI, one switch output unit DO, a processor MPU and a communication unit.
[0053] Among them, the analog input unit AI and the first switch input unit DI are used to respectively receive the sensor signals collected by the field signal acquisition module. Specifically, in this embodiment, the sensor signal includes the first channel intermediate range nuclear power signal and the first channel intermediate range nuclear measurement device fault signal. The analog input unit AI 301 receives the first channel intermediate range nuclear power signal, and the first channel intermediate range nuclear power signal includes the intermediate range nuclear power value input by the field device and the first channel quality bit information; the first switch input unit DI 302 receives the first channel intermediate range nuclear measurement device fault signal, and the first channel intermediate range nuclear measurement device fault signal includes the first channel nuclear measurement device fault information and the first channel quality bit information. Specifically, when the first channel intermediate range nuclear measurement device fault signal value is 0, it indicates that the first channel intermediate range nuclear measurement device has a fault; when the first channel intermediate range nuclear measurement device fault signal value is 1, it indicates that the first channel intermediate range nuclear measurement device has not a fault.
[0054] The control system of this embodiment is also provided with a conditioning module 600, which is used to convert the above-mentioned sensor signals into analog input signals and digital input signals, and send the converted analog input signals and digital input signals to the analog input unit AI 301 and the first switch input unit DI 302 respectively.
[0055] The second switch input unit DI and the third switch input unit DI are used to receive input signals sent by the control panel module. Specifically, the input signal sent by the control panel module 200 in this embodiment includes: a first channel intermediate range nuclear measurement device bypass signal and a first channel bypass signal. The second switch input unit DI 303 receives the first channel intermediate range nuclear measurement device bypass signal, and the first channel intermediate range nuclear measurement device bypass signal includes the first channel intermediate range nuclear measurement device bypass information and the first channel quality bit information. The third switch input unit DI 304 receives the first channel bypass signal. Specifically, when the bypass signal value of the first channel intermediate range nuclear measurement device is 0, it indicates that the first channel intermediate range nuclear measurement device is bypassed; when the bypass signal value of the first channel intermediate range nuclear measurement device is 1, it indicates that the first channel intermediate range nuclear measurement device is not bypassed; when the bypass signal value of the first channel is 0, it indicates that the first channel is not bypassed; when the bypass signal value of the first channel is 1, it indicates that the first channel is bypassed. It should be understood that the meaning of the second channel signal value is the same as the meaning of the corresponding signal value of the first channel, so it will not be repeated here.
[0056] The fourth switch input unit DI to the seventh switch input unit DI are used to receive the output signals of the second channel signal output module through the communication unit. Specifically, the output signal of the second channel signal output module 400 in this embodiment includes: a second channel bypass signal, a second channel mid-range nuclear measurement device fault signal, a second channel quality position fault signal and a second channel mid-range nuclear power high signal. The fourth switch input unit DI 305 to the seventh switch input unit DI 308 receive the above output signals in sequence. The eighth switch input unit DI 309 is used to receive a locking signal through the communication unit 340, and the locking signal in this embodiment is B10.
[0057] The processor MPU in the first channel control module 300 is used to perform logic operations on the sensor signal, the input signal from the control panel module, the output signal of the second channel signal output module and the locking signal to generate a logic operation result. Specifically, the processor MPU includes a threshold judgment unit, thirteen AND gates and two OR gates. The connection relationship and logic operation process between the processor MPU and the switch input unit, the analog input unit, and the switch output unit in the first channel control module 300 will be described in detail below.
[0058] like Figure 1As shown, the threshold judgment unit 310 in the processor MPU is connected to the analog input unit AI 301, and is used to receive the first channel mid-range nuclear power signal output by the analog input unit AI 301, and perform a threshold judgment on the mid-range nuclear power value therein. If the threshold judgment condition is met, the output threshold judgment result is a first channel mid-range nuclear power high signal.
[0059] The first AND gate 311 is connected to the threshold judgment unit 310, and is used to receive the threshold judgment result and the first channel intermediate range nuclear measurement device fault information output by the first switch input unit DI 302, and perform an AND operation on the threshold judgment result and the nuclear measurement device fault signal, and output a first operation result. It should be noted that if the first channel intermediate range nuclear measurement device fails, the accident alarm signal generated by the high power of the first channel intermediate range nuclear measurement device is cleared and the first channel intermediate range nuclear measurement device fault signal is output. Specifically, if the output result of the threshold judgment unit 310 is a first channel intermediate range nuclear power high signal, the corresponding signal value is 1, and the output of the first switch input unit DI 302 is a first channel intermediate range nuclear measurement device fault signal, the corresponding signal value is 0, then after the AND operation of the first AND gate 311, its output can be obtained as 0, thereby clearing the accident alarm signal generated by the first channel intermediate range nuclear power high; at the same time, the first channel intermediate range nuclear measurement device fault signal output by the first switch input unit DI 302 will be transmitted to the fifth AND gate 315, and the signal value of the first channel intermediate range nuclear measurement device fault signal will participate in the AND operation of the fifth AND gate 315 after the negation operation.
[0060] The second AND gate 312 is connected to the first AND gate 311 and the second switch input unit DI 303 respectively, and is used to receive the first operation result of the first AND gate 311 and the first channel intermediate range nuclear measurement device bypass signal output by the second switch input unit DI 303, and perform an AND operation on the above signals to output a second operation result. The second operation result will be transmitted to the second channel (B channel) and the third AND gate 313 respectively. It should be noted that if the signal value of the received first channel intermediate range nuclear measurement device bypass signal is 0, that is, the first channel intermediate range nuclear measurement device is bypassed, the first channel intermediate range nuclear power high signal output by the first channel intermediate range nuclear measurement device no longer participates in the logic operation, and the second operation result of the second AND gate 312 is 0.
[0061] The third AND gate 313 is connected to the second AND gate 312 and the third switch input unit DI 304 respectively, and is used to receive the second operation result of the second AND gate 312 and the negation of the first channel bypass signal output by the third switch input unit DI 304, and perform AND operation on the above signals to output the third operation result. It should be noted that the first or second channel bypass signal will bypass the signal of the entire channel, that is, the signal of the entire channel does not participate in the logic operation. For example, if the first channel is bypassed (that is, the value of the first channel bypass signal is 1, and its negation value is 0), the second operation result of the second AND gate 312 is 1, then the third operation result output after the AND operation of the third AND gate 313 is 0; in addition, the operation results of the fourth AND gate 314 and the fifth AND gate 315 that receive the negation of the first bypass channel signal are also 0. Based on the above operation results, it can be concluded that when the first channel is bypassed, if the second channel is not bypassed at this time and the second channel mid-range core power is high, an alarm signal can still be output.
[0062] The first OR gate 325 is connected to the analog input unit AI 301, the first switch input unit DI 302 and the second switch input unit DI 303 respectively, and is used to receive the first channel quality bit information output by the analog input unit AI 301, the first switch input unit DI 302 and the second switch input unit DI 303, and perform an OR operation on the above signals to output a fourth operation result. The fourth operation result is the judgment result of the first channel quality bit failure, which will be transmitted to the second channel (B channel) and the fourth AND gate 314 respectively.
[0063] The fourth AND gate 314 is connected to the first OR gate 325 and the third switch input unit DI 304, respectively, and is used to receive the negation of the fourth operation result output by the first OR gate 325 and the first channel bypass signal output by the third switch input unit DI 304, and perform an AND operation on the above signals to output a fifth operation result. If the value of the first channel bypass signal is 0, that is, the first channel is not bypassed, and the fourth operation result received at this time is 1, then the fifth operation result output at this time indicates that the first channel is not bypassed, and the quality bit of the first channel is faulty.
[0064] The sixth AND gate 316 is connected to the fourth switch input unit DI 305 and the fifth switch input unit DI 306, respectively, and is used to receive the negation of the second channel bypass signal output by the fourth switch input unit DI 305 and the negation of the second channel intermediate range nuclear measurement device fault signal output by the fifth switch input unit DI 306, and perform an AND operation on the above signals to output the seventh operation result. If the second channel bypass signal value is 0, that is, the second channel is not bypassed, and the second channel intermediate range nuclear measurement device fault signal value received at this time is 0, then the seventh operation result output at this time indicates that the second channel is not bypassed and the second channel intermediate range nuclear measurement device fails.
[0065] The eleventh AND gate 321 is connected to the fourth AND gate 314 and the sixth AND gate 316 respectively, and is used to receive the fifth operation result output by the fourth AND gate 314 and the seventh operation result output by the sixth AND gate 316, and perform AND operation on the above signals to output the twelfth operation result. If the fifth operation result and the seventh operation result are both 1, the twelfth operation result output by the AND operation indicates that the first and second channels are not bypassed, the quality position of the first channel is faulty, and the intermediate range nuclear measurement device of the second channel is faulty. It can be seen from the above description that the utility model performs AND operation on the fault signal of the first channel and the fault signal of the second channel, so that the alarm signal is output only when both the first channel and the second channel fail, thereby reducing the risk of false touch of the nuclear power triggering the shutdown protection signal due to the failure of a single component.
[0066] The fifth AND gate 315 is connected to the first switch input unit DI 302 and the third switch input unit DI 304, respectively, and is used to receive the negation of the first channel intermediate range nuclear measurement device fault signal output by the first switch input unit DI 302 and the negation of the first channel bypass signal output by the third switch input unit DI 304, and perform an AND operation on the above signals to output a sixth operation result. If the value of the first channel bypass signal is 0, that is, the first channel is not bypassed, and the value of the first channel intermediate range nuclear measurement device fault signal received at this time is 0, then the sixth operation result indicates that the first channel is not bypassed and the first channel intermediate range nuclear measurement device fails.
[0067] The ninth AND gate 319 is connected to the fifth AND gate 315 and the sixth AND gate 316 respectively, and is used to receive the sixth operation result output by the fifth AND gate 315 and the seventh operation result output by the sixth AND gate 316, and perform AND operation on the above signals to output a tenth operation result. If the sixth operation result and the seventh operation result are both 1, then the tenth operation result output at this time indicates that the first and second channels are not bypassed, the mid-range nuclear measurement device of the first channel fails, and the mid-range nuclear measurement device of the second channel fails.
[0068] The seventh AND gate 317 is connected to the fourth switch input unit DI 305 and the sixth switch input unit DI 307, respectively, and is used to receive the negation of the second channel bypass signal output by the fourth switch input unit DI 305 and the second channel quality bit fault signal output by the sixth switch input unit DI 307, and perform an AND operation on the above signals to output an eighth operation result. When the eighth operation result is 1, it indicates that the second channel is not bypassed and the second channel quality bit is faulty.
[0069] The tenth AND gate 320 is connected to the fourth AND gate 314 and the seventh AND gate 317 respectively, and is used to receive the fifth operation result output by the fourth AND gate 314 and the eighth operation result output by the seventh AND gate 317, and perform an AND operation on the above signals to output an eleventh operation result. When the fifth operation result and the eighth operation result are both 1, the eleventh operation result output after the AND operation indicates that the first and second channels are not bypassed, the quality bit of the first channel is faulty, and the quality bit of the second channel is faulty.
[0070] The twelfth AND gate 322 is connected to the fifth AND gate 315 and the seventh AND gate 317 respectively, and is used to receive the sixth operation result output by the fifth AND gate 315 and the eighth operation result output by the seventh AND gate 317, and perform AND operation on the above signals to output the thirteenth operation result. When the sixth operation result and the eighth operation result are both 1, the thirteenth operation result output after the AND operation indicates that the first and second channels are not bypassed, the intermediate range nuclear measurement device of the first channel fails, and the quality bit of the second channel fails.
[0071] The eighth AND gate 318 is connected to the fourth switch input unit DI 305 and the seventh switch input unit DI 308, respectively, and is used to receive the negation of the second channel bypass signal output by the fourth switch input unit DI 305 and the second channel mid-range nuclear power high signal output by the seventh switch input unit DI 308, and perform an AND operation on the above signals to output a ninth operation result. When the ninth operation result is 1, it indicates that the second channel is not bypassed and the second channel mid-range nuclear power is high.
[0072] Based on the above description of the logic operations of the third AND gate 313, the tenth AND gate 320, the ninth AND gate 319, the eleventh AND gate 321, the twelfth AND gate 322 and the eighth AND gate 318, it can be known that the above logic operation results include six scenarios that will trigger alarm signals when the first and second channels are not bypassed, namely: 1. The mid-range core power of the first channel is high; 2. The quality bit of the first channel is faulty and the quality bit of the second channel is faulty; 3. The mid-range core measurement device of the first channel is faulty and the mid-range core measurement device of the second channel is faulty; 4. The quality bit of the first channel is faulty and the mid-range core measurement device of the second channel is faulty; 5. The mid-range core measurement device of the first channel is faulty and the quality bit of the second channel is faulty; 6. The mid-range core power of the second channel is high. The utility model is respectively connected to the third AND gate 313, the tenth AND gate 320, the ninth AND gate 319, the eleventh AND gate 321, the twelfth AND gate 322 and the eighth AND gate 318 through the second OR gate 323, receives the output results of the third AND gate 313, the tenth AND gate 320, the ninth AND gate 319, the eleventh AND gate 321, the twelfth AND gate 322 and the eighth AND gate 318, and performs OR operation on the above six operation results through the second OR gate 323, so that the alarm signal can be triggered when any scenario of triggering the alarm signal is met.
[0073] In addition, the processor MPU of this embodiment further includes a thirteenth AND gate 324, which is connected to the second OR gate 323 and the eighth switch input unit DI 309, respectively, and is used to receive the negation of the fourteenth operation result output by the second OR gate 323 and the lock signal output by the eighth switch input unit DI 309, and perform an AND operation on the above signals to output a fifteenth operation result. This logic design can be understood as that the control system of the utility model can only trigger the first channel intermediate range nuclear power high shutdown protection signal when no lock signal is generated.
[0074] After the control system signal is subjected to internal logic operation of the processor MPU, the logic operation result is output by the switch output unit DO 330. The processor MPU can be redundantly configured to improve the reliability of the control system.
[0075] The power supply module 500 is used to supply power to the first channel control module. Further, the power supply module is configured with AC\DC redundancy, and converts 220VAC to 24VDC to supply power to the first channel control module.
[0076] In addition, the utility model also supports digital systems based on technologies such as FPGA\CPLD, and the redundantly configured processor MPU and power supply module can be configured into a redundant mode such as three out of two or four out of two as needed.
[0077] Based on the above description of the control system of the utility model, it can be concluded that the utility model optimizes the internal operation logic of the processor and logically combines the bypass state and fault state of different channels, so that the fault signal of a single device will not directly cause the device to output a shutdown protection signal. That is, when the first channel mid-range nuclear measurement device fails, the first channel quality position fails, the second channel mid-range nuclear measurement device fails, and the second channel quality position fails, the shutdown protection signal cannot be triggered, thereby solving the problem of unexpected shutdown of the reactor. But at the same time, the utility model can still ensure that the emergency shutdown of the reactor can be triggered when any channel normally sends a shutdown signal.
[0078] Specifically, when the channel is not bypassed, the utility model will trigger the first channel mid-range nuclear power high shutdown protection signal only in the following scenarios, such as: the first channel mid-range nuclear power is high; the second channel mid-range nuclear power is high; the first channel mid-range nuclear measurement device fails and the second channel mid-range nuclear measurement device fails; the first channel mid-range nuclear measurement device fails and the second channel quality position fails; the first channel quality position fails and the second channel mid-range nuclear measurement device fails; the first channel quality position fails and the second channel quality position fails. When the channel is bypassed, the shutdown protection signal will only be triggered when another channel generates a mid-range nuclear power high trigger alarm signal.
[0079] In summary, it can be seen from the above description that the above embodiments of the present invention achieve the following technical effects:
[0080] 1. The utility model optimizes the internal operation logic of the processor and logically combines the bypass status and fault status of different channels, so that the fault signal of a single device will not directly cause the control system to output a shutdown protection signal, thereby reducing the risk of false triggering of the nuclear power shutdown protection signal due to the failure of a single component, solving the problem of unexpected shutdown of the reactor, and improving the overall operating efficiency of the nuclear power plant.
[0081] 2. While reducing the risk of accidental triggering of the nuclear power shutdown protection signal due to failure of a single component, the utility model can still ensure that the reactor emergency shutdown can be triggered when any channel normally sends a shutdown signal, and the reactor protection logic inside the control system has high reliability.
[0082] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
[0083] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0084] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they contradict each other.
Claims
1. A nuclear power plant nuclear power triggered shutdown control system, characterized in that: include: On-site signal acquisition module, control panel module, first channel control module, second channel signal output module and power supply module, The first channel control module includes a plurality of switch input units DI, an analog input unit AI, a switch output unit DO, a processor MPU and a communication unit; The analog input unit AI and the first switch input unit DI are used to respectively receive the sensor signals collected by the field signal collection module; The second switch input unit DI and the third switch input unit DI are used to receive input signals sent by the control panel module; The fourth switch input unit DI to the seventh switch input unit DI are used to respectively receive the output signal of the second channel signal output module through the communication unit; The eighth switch input unit DI is used to receive a locking signal through the communication unit; The processor MPU is used to perform a logic operation on the sensor signal, the input signal sent by the control panel module, the output signal of the second channel signal output module, and the locking signal to generate a logic operation result; The switch output unit DO is used to output the logic operation result; The power supply module is used to supply power to the first channel control module.
2. The system according to claim 1, characterized in that The system further comprises a conditioning module, which is used for converting the sensor signal into an analog input signal and a digital input signal, and sending the analog input signal and the digital input signal to the analog input unit AI and the first switch input unit DI respectively.
3. The system according to claim 1, characterized in that The sensor signal includes a first channel mid-range nuclear power signal and a first channel mid-range nuclear measuring device fault signal.
4. The system according to claim 3, characterized in that The first channel mid-range nuclear power signal and the first channel mid-range nuclear measurement device fault signal both include first channel quality bit information.
5. The system according to claim 4, characterized in that The input signal sent by the control panel module includes: a first channel mid-range nuclear measuring device bypass signal and a first channel bypass signal.
6. The system according to claim 5, characterized in that The output signals of the second channel signal output module include: a second channel bypass signal, a second channel mid-range nuclear measurement device fault signal, a second channel quality position fault signal and a second channel mid-range nuclear power high signal.
7. The system according to claim 6, characterized in that The processor MPU includes a threshold judgment unit, thirteen AND gates and two OR gates. The threshold judgment unit is connected to the analog input unit AI, and is used to receive the first channel intermediate range nuclear power signal output by the analog input unit AI, and perform threshold judgment on the above signal, and output the threshold judgment result; The first AND gate is connected to the threshold judgment unit, and is used to receive the threshold judgment result and the first channel intermediate range nuclear measurement device fault signal output by the first switch input unit DI, and perform an AND operation on the above signals to output a first operation result; The second AND gate is connected to the first AND gate and the second switch input unit DI respectively, and is used to receive the first operation result of the first AND gate and the first channel intermediate range nuclear measurement device bypass signal output by the second switch input unit DI, and perform an AND operation on the above signals to output a second operation result; The third AND gate is connected to the second AND gate and the third switch input unit DI respectively, and is used to receive the second operation result of the second AND gate and the negation of the first channel bypass signal output by the third switch input unit DI, and perform an AND operation on the above signals to output a third operation result; The first OR gate is connected to the analog input unit AI, the first switch input unit DI and the second switch input unit DI respectively, and is used to receive the first channel quality bit signal output by the analog input unit AI and the first switch input unit DI and the first channel intermediate range nuclear measurement device bypass signal output by the second switch input unit DI, and perform an OR operation on the above signals to output a fourth operation result; The fourth AND gate is connected to the first OR gate and the third switch input unit DI respectively, and is used to receive the negation of the fourth operation result output by the first OR gate and the first channel bypass signal output by the third switch input unit DI, and perform an AND operation on the above signals to output a fifth operation result; The fifth AND gate is connected to the first switch input unit DI and the third switch input unit DI respectively, and is used to receive the negation of the first channel intermediate range nuclear measurement device fault signal output by the first switch input unit DI and the negation of the first channel bypass signal output by the third switch input unit DI, and perform an AND operation on the above signals to output a sixth operation result; The sixth AND gate is connected to the fourth switch input unit DI and the fifth switch input unit DI respectively, and is used to receive the negation of the second channel bypass signal output by the fourth switch input unit DI and the negation of the second channel intermediate range nuclear measurement device fault signal output by the fifth switch input unit DI, and perform an AND operation on the above signals to output a seventh operation result; The seventh AND gate is connected to the fourth switch input unit DI and the sixth switch input unit DI respectively, and is used to receive the negation of the second channel bypass signal output by the fourth switch input unit DI and the second channel quality bit fault signal output by the sixth switch input unit DI, and perform an AND operation on the above signals to output an eighth operation result; The eighth AND gate is connected to the fourth switch input unit DI and the seventh switch input unit DI respectively, and is used to receive the negation of the second channel bypass signal output by the fourth switch input unit DI and the second channel mid-range core power high signal output by the seventh switch input unit DI, and perform an AND operation on the above signals to output a ninth operation result; The ninth AND gate is connected to the fifth AND gate and the sixth AND gate respectively, and is used to receive the sixth operation result output by the fifth AND gate and the seventh operation result output by the sixth AND gate, and perform an AND operation on the above signals to output a tenth operation result; The tenth AND gate is connected to the fourth AND gate and the seventh AND gate respectively, and is used to receive the fifth operation result output by the fourth AND gate and the eighth operation result output by the seventh AND gate, and perform an AND operation on the above signals to output an eleventh operation result; The eleventh AND gate is connected to the fourth AND gate and the sixth AND gate respectively, and is used to receive the fifth operation result output by the fourth AND gate and the seventh operation result output by the sixth AND gate, and perform an AND operation on the above signals to output a twelfth operation result; The twelfth AND gate is connected to the fifth AND gate and the seventh AND gate respectively, and is used to receive the sixth operation result output by the fifth AND gate and the eighth operation result output by the seventh AND gate, and perform an AND operation on the above signals to output a thirteenth operation result; The second OR gate is connected to the third AND gate, the tenth AND gate, the ninth AND gate, the eleventh AND gate, the twelfth AND gate and the eighth AND gate respectively, and is used to receive the output results of the third AND gate, the tenth AND gate, the ninth AND gate, the eleventh AND gate, the twelfth AND gate and the eighth AND gate, and perform an OR operation on the above signals to output a fourteenth operation result; The thirteenth AND gate is connected to the second OR gate and the eighth switch input unit DI respectively, and is used to receive the negation of the fourteenth operation result output by the second OR gate and the lock signal output by the eighth switch input unit DI, and perform an AND operation on the above signals to output the fifteenth operation result.
8. The system according to claim 1, characterized in that The power supply module is configured with AC\DC redundancy, and converts 220VAC to 24VDC to supply power to the first channel control module.
Citation Information
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Nuclear power plant nuclear power trigger shutdown control system
CN117672576A