Nuclear reactor protection system operation bypass device

Abstract

The invention provides a nuclear reactor protection system operation bypass device which comprises an input isolation assembly, a 1 / 3 logic assembly, a 1 / N logic assembly and a protection preparation assembly, the nuclear reactor protection system operation bypass device can achieve operation bypass of thermal parameters, periodic protection, periodic instrument protection faults and small-power protection in the reactor starting process, and meanwhile, the operation bypass of the nuclear reactor protection system is achieved. Operation of the bypass device also simplifies the design of the protection system. Field tests prove that the bypass device is safe and reliable to operate, and can meet relevant requirements of reactor operation.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear engineering equipment, and in particular to an operation bypass device for a nuclear reactor protection system. Background Art

[0002] The reactor protection system is crucial to the safe operation of the reactor. When designing the protection system, we always hope that the system can work safely and reliably, that is, we do not want any false operation or failure to operate during the operation of the reactor. However, this is actually impossible. Foreign countries require the failure rate of nuclear power plant protection systems to be less than 10%. -6 GB4083 requires that the safety failure of each variable in the power reactor should not exceed once a year.

[0003] During the reactor startup process, some thermal parameters, periodic protection, low-power protection and periodic instrument failure protection alarm signals or shutdown signals are in the protection interval, which may easily lead to (reactor) emergency shutdown, resulting in too frequent startup failures. Summary of the invention

[0004] The present invention designs a nuclear reactor protection system operation bypass device which can solve the problem of startup failure caused by some protection parameters being in the protection range during the startup process, can eliminate malfunction of the protection system during the startup process, and improve the reliability of the reactor operation.

[0005] The present invention provides an operation bypass device for a nuclear reactor protection system, the operation bypass device comprising an input isolation component, a 1 / 3 logic component, a 1 / N logic component, and a protection ready component;

[0006] The input isolation component is connected to the 1 / 3 logic component and the 1 / N logic component in sequence, and the input isolation component is used to receive the monitoring signals transmitted by the three power protection instruments and output corresponding switch quantity signals to the 1 / 3 logic component;

[0007] The 1 / 3 logic component is used to perform logic processing based on the switch signal input by the input isolation component to obtain a bypass result, wherein the bypass result includes determining a first protection parameter that is allowed to pass through the 1 / N logic component and a second protection parameter that is not allowed to pass through the 1 / N logic component;

[0008] The protection ready component is connected to the nuclear reactor protection system and the 1 / 3 logic component, and is used to feed back the bypass result to the protection system.

[0009] Optionally, the input isolation component is composed of a 4N26 photoelectric isolator, including three phototransistors, which are respectively connected to the three power protectors to receive power operating condition node signals of the three power protectors, and the power operating condition node signals include a monitoring signal of whether the power protector is operating at the minimum gear.

[0010] Optionally, the 1 / 3 logic component has three input terminals, which are respectively connected to three phototransistors of the input isolation component to receive switch signals transmitted via the three phototransistors.

[0011] Optionally, the 1 / N logic component includes thirty parameter signal input terminals, and thirty parameter signals are respectively input to the thirty parameter signal input terminals;

[0012] When the reactor is operating normally, the input signals of the thirty parameter signal output terminals are all high level, and the output current of the 1 / N logic component is greater than 10mA;

[0013] When an accident occurs in the reactor, the corresponding input parameter signal changes from high level to low level, the output current of the 1 / N logic component is 0, and an automatic shutdown signal is issued to realize the comprehensive shutdown function.

[0014] Optionally, the protection ready component receives a level signal sent from the protection system and simultaneously receives two level signals from the 1 / 3 logic component to the protection component;

[0015] When all protection parameters are normal, the protection ready component outputs four pairs of relay contact signals, which are sent to the shutdown drive components of the three channels and the protection ready signal light in the main control room respectively; when the reactor is put into operation, the shutdown drive component outputs a pair of relay contact signals into the protection ready component, turning off the protection ready signal light.

[0016] Optionally, the 1 / 3 logic component has six output terminals, namely a first output terminal OUT1, a second output terminal OUT2, a third output terminal OUT3, a fourth output terminal OUT4, a fifth output terminal OUT5, and a sixth output terminal OUT6;

[0017] The 1 / N logic component includes four conditional signal input terminals, which are respectively connected to the second output terminal OUT2, the third output terminal OUT3, the fifth output terminal OUT5 and the sixth output terminal OUT6 of the 1 / 3 logic component.

[0018] Optionally, when the second output terminal OUT2 and the third output terminal OUT3 of the 1 / 3 logic component are at a high level, the input conditions of the three parameter signal input terminals IN22 to IN24 of the 1 / N logic component are shutdown signals, which cannot pass through the 1 / N logic component;

[0019] When the fifth output terminal OUT5 and the sixth output terminal OUT6 of the 1 / 3 logic component are at high level, the input conditions of the three parameter signal input terminals IN25 to IN30 of the 1 / N logic component are shutdown signals and cannot pass through the 1 / N logic component.

[0020] Optionally, the protection ready component has two signal input terminals, and the two signal input terminals of the protection ready component are respectively connected to the first output terminal OUT1 and the fourth output terminal OUT4 of the 1 / 3 logic component.

[0021] The nuclear reactor protection system operation bypass device provided by the present invention is used for the reactor startup process. When some thermal parameters of the reactor are in the protection range, the protection action of the protection system may be mistakenly triggered, resulting in an emergency shutdown, and thus the startup failure. When the three power protection instruments leave the minimum gear (when the reactor power increases to a certain value, the range of the power protection instrument will change), due to the existence of periodic protection, low-power protection and periodic instrument failure protection, the protection system takes corresponding actions and the reactor is shut down urgently. The setting of the nuclear reactor protection system operation bypass is to ensure that unplanned shutdowns are minimized and the operability of the reactor is improved under the premise of ensuring that the protection system functions normally.

[0022] The nuclear reactor protection system operation bypass device of the present invention has a simple structure, is reasonable and reliable, and is easy to use. It can realize the operation bypass of thermal parameters, periodic protection, periodic instrument protection failure, and low-power protection during the start-up process. At the same time, the operation bypass device also simplifies the design of the protection system. Through field tests, it is confirmed that the operation bypass device is safe and reliable and can meet the relevant requirements of reactor operation.

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 A schematic diagram of the structure of a bypass device for a nuclear reactor protection system according to an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of an isolation component in an operation bypass device of a nuclear reactor protection system according to an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the internal part of the isolation component in the operation bypass device of the nuclear reactor protection system according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic block diagram of a circuit principle of a 1 / 3 logic component in a bypass device for a nuclear reactor protection system according to an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of a 1 / N logic component in a bypass device for a nuclear reactor protection system according to an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of components for preparing protection in a bypass device for a nuclear reactor protection system according to an embodiment of the present invention;

[0031] Figure 7 It is a schematic diagram of the working principle of the bypass device of the nuclear reactor protection system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] The present invention provides a nuclear reactor protection system operation bypass device, which can automatically perform the operation bypass function according to the gear range change of the power protection instrument. Figure 1 As shown, the operation bypass device includes an input isolation component, a 1 / 3 logic component, a 1 / N logic component, and a protection ready component; the input isolation component is connected to the 1 / 3 logic component and the 1 / N logic component in sequence, the input isolation component is used to receive the monitoring signals transmitted by the three power protection instruments, and output the corresponding switch quantity signals (i.e., whether the three power instruments are in the minimum gear node signal) to the 1 / 3 logic component; the 1 / 3 logic component is used to perform logic processing based on the switch quantity signals input by the input isolation component to obtain a bypass result, and the bypass result includes determining a first protection parameter that is allowed to pass through the 1 / N logic component and a second protection parameter that is not allowed to pass through the 1 / N logic component; the protection ready component is connected to the nuclear reactor protection system and the 1 / 3 logic component, and is used to feed back the bypass result to the protection system.

[0037] The nuclear reactor protection system operation bypass device provided in the embodiment of the present invention can realize the operation bypass of thermal parameters, periodic protection, periodic instrument fault protection, and low-power protection during the start-up process. The setting of the nuclear reactor protection system operation bypass is to ensure that the normal start-up is achieved under the premise that the protection system functions normally, thereby improving the protection reliability of the protection system. At the same time, the setting of this reactor operation bypass greatly reduces the complexity of system design, reduces the setting of unnecessary system protection parameters, shortens the response time, and improves the safety and reliability of reactor operation.

[0038] 1. Input Isolation Components

[0039] The input isolation component is composed of 4N26 photoelectric isolators. When the monitoring signals transmitted from the three power protection instruments change, the three photoelectric transistors output switching signals.

[0040] When the power protector is at the minimum gear, its corresponding normally open contact (energized) is in a closed state, and the photoelectric transistor of the input isolation component is turned on. When the power protector leaves the minimum gear, its normally open contact is disconnected, and the photoelectric transistor of the input isolation component is disconnected. For the main principle of the input isolation component, see Figure 2-3 , Figure 3 A schematic diagram of a group of phototransistors is shown schematically. In practical applications, three phototransistors can be set according to needs to correspond to the output switch signal (i.e., whether the three power meters are in the minimum gear node signal).

[0041] The input isolation component has a first input terminal IN1, a second input terminal IN2 and a third input terminal IN3, and a first output terminal OUT1, a second output terminal OUT2 and a third output terminal OUT3. The first input terminal IN1, the second input terminal IN2 and the third input terminal IN3 of the input isolation component are respectively connected to the power protection devices to receive the monitoring signals transmitted by the three power protection devices.

[0042] The input isolation component isolates the operation bypass signal and the protection system signal to avoid mutual influence.

[0043] 2. 1 / 3 Logic Components

[0044] The 1 / 3 logic component is used for three identical channels to work in parallel. When one of the channels meets the trigger condition, the corresponding judgment is triggered to change the level of the output end of the 1 / 3 component.

[0045] The power operating condition (i.e., whether it is at the minimum gear) node signal of the power protection device is first input into the isolation component, and the signal output from the isolation component is sent to the three input terminals of the 1 / 3 logic component. That is, the first output terminal OUT1, the second output terminal OUT2, and the third output terminal OUT3 of the three output terminals of the input isolation component are respectively connected to the three input terminals of the 1 / 3 logic component, such as Figure 4 OUT1->1 / 3IN, OUT2->1 / 3IN, OUT3->1 / 3IN. The 1 / 3 logic component is equipped with two LED lights, such as Figure 4 When the three power protection devices are at the minimum level at the same time, the second LED ( Figure 4 H2) The green light is on. At this time, the outputs of OUT4->IN12.BW, OUT5->IN34.1 / N, OUT6->IN35.1 / N (three outputs of the logic component) of the 1 / 3 logic component are high level, so that the thermal parameter protection signal cannot pass through the 1 / N logic component, thereby completing the operation bypass.

[0046] When any of the three power protection devices leaves the minimum gear, the thermal parameter operation bypass can be released. When all three power protection devices leave the minimum gear at the same time, the first LED ( Figure 4 H1) The green light is on. At this time, the outputs of OUT1->IN11.BW, OUT2->IN31.1 / N, OUT3->IN32.1 / N (three outputs of the logic component) of the 1 / 3 logic component are high level, so that the cycle protection, cycle instrument failure protection, and low-power protection signals cannot pass through the 1 / N logic component, thereby realizing the cycle protection and low-power operation bypass at the same time. When the 1 / 3 logic component is in operation bypass, it can also realize the relay contact unblocking accident signal alarm function. See the 1 / 3 logic component circuit diagram Figure 4 The 1 / 3 logic component has six output terminals, namely a first output terminal OUT1, a second output terminal OUT2, a third output terminal OUT3, a fourth output terminal OUT4, a fifth output terminal OUT5, and a sixth output terminal OUT6.

[0047] Among them, the gear knob of the power protection instrument can be set to manual mode, and manual gear switching can trigger a bypass signal.

[0048] 1 / N Logic Components

[0049] 1 / N logic component refers to N identical channels working in parallel. When one of the channels meets the trigger condition, it triggers the corresponding judgment and changes the level of the output terminal of the 1 / N component. The function of the 1 / N component is: 30 parameter signals are input to IN1~IN30 of the 1 / N logic component. When the reactor is operating normally, all thirty input signals are high level, and the output current of the 1 / N logic component is greater than 10mA. When an accident occurs in the reactor, any corresponding input parameter signal changes from high level to low level, the output current of the 1 / N logic component is 0, and an automatic shutdown signal is issued to realize the comprehensive shutdown function.

[0050] The main schematic diagram of 1 / N logic components is shown in Figure 5 . Thirty protection parameter signals (such as physical thermal protection signals, such as reactor coolant flow / temperature, etc.) are input as input parameter signals to the parameter signal input terminals IN1 to IN30 of the 1 / N logic component. When the reactor operates normally, the thirty input parameter signals are all high level, and the output current of the 1 / N logic component is greater than 10mA. When an accident occurs in the reactor, the corresponding input parameter signal (low reactor coolant flow / high temperature / high pressure / external power failure, etc.) changes from high level to low level, the output current of the 1 / N logic component is 0, and an automatic shutdown signal is issued to realize the comprehensive shutdown function.

[0051] The 1 / N logic component has four conditional signal input terminals, including a first conditional signal input terminal IN31.1 / N, a second conditional signal input terminal IN32.1 / N, a third conditional signal input terminal IN34.1 / N and a fourth conditional signal input terminal IN35.1 / N, and also has a first output terminal OUT1, a second output terminal OUT2, a third output terminal OUT3 and a fourth output terminal OUT4. The first output terminal OUT1 is connected to IN1 of the shutdown drive component, the second output terminal OUT2 is connected to IN2 of the shutdown drive component, and the third output terminal OUT3 and the fourth output terminal OUT4 are connected to IN15 IN20 of the shutdown refusal alarm component.

[0052] The main function of the shutdown drive assembly is to realize the emergency shutdown of the reactor. During the operation of the nuclear reactor, when an abnormal situation occurs (such as uncontrolled lifting of the control rod, loss of coolant and other accident conditions), the shutdown drive assembly can quickly insert the control rod into the core. Because the control rod can absorb neutrons, the chain reaction can be quickly stopped, thereby ensuring the safety of the reactor and preventing the accident from further deteriorating.

[0053] The shutdown refusal alarm component is mainly used to monitor the operating status of the shutdown system. When a shutdown action should be triggered (for example, some faults or abnormal parameters reach the shutdown threshold), but the shutdown system does not respond normally (i.e., shutdown refusal), the component will send out an alarm signal. This signal allows the staff to promptly discover the failure of the shutdown mechanism so that they can take manual and other emergency measures to shut down the reactor, avoid serious accidents that may be caused by shutdown failure, and ensure the safety of the nuclear reactor.

[0054] The input terminals IN31.1 / N, IN32.1 / N, IN34.1 / N, and IN35.1 / N of the 1 / N logic component serve as conditional signal input terminals, and respectively receive level signals output from the second output terminal OUT2, the third output terminal OUT3, the fifth output terminal OUT5, and the sixth output terminal OUT6 of the 1 / 3 logic component, namely: OUT2->IN31.1 / N, OUT3->IN32.1 / N, OUT5->IN34.1 / N, OUT6->IN35.1 / N.

[0055] The output signals of the second output terminal OUT2 and the third output terminal OUT3 of the 1 / 3 logic component are sent to the first conditional signal input terminal IN31 and the second conditional signal input terminal IN32 of the 1 / N logic component, namely OUT2->IN31.1 / N, OUT3->IN32.1 / N. The output signals of the fifth output terminal OUT5 and the sixth output terminal OUT6 of the 1 / 3 logic component are then input to the third conditional signal input terminal IN34 and the fourth conditional signal input terminal IN35 of the 1 / N logic component, namely OUT5->IN34.1 / N, OUT6->IN35.1 / N. When OUT2->IN31.1 / N and OUT3->IN32.1 / N are high levels, the input conditions of the three parameter signal input terminals IN22 to IN24 of the 1 / N logic component are shutdown signals (cycle protection, instrument failure protection, low power protection), which cannot pass through the 1 / N logic component. When OUT5->IN34.1 / N, OUT6->IN35.1 / N are high level, the input conditions of the three parameter signal input terminals IN25~IN30 of the 1 / N logic component are shutdown signals (thermal parameters), which cannot pass through the 1 / N logic component. IN25, IN26, IN27, IN28, IN29, IN30 represent the signals of low reactor coolant flow, high reactor outlet temperature, high reactor inlet temperature, low reactor inlet pressure, and low reactor outlet pressure, respectively.

[0056] 4. Protect the prepared components

[0057] The function of the protection ready component is to determine whether all protection parameters of the protection system are normal. When all parameters are normal, the protection ready signal is triggered. The structure is shown in Figure 6 .

[0058] The protection ready component has two signal input terminals IN11.BW and IN12.BW. The protection ready component receives the level signal sent from the protection system (referring to the signal whether the reactor protection parameters are normal), and at the same time receives two level signals OUT1 and OUT4 from the 1 / 3 logic component to IN11.BW and IN12.BW of the protection ready component, that is, OUT1->IN11.BW, OUT4->IN12.BW. The protection ready component is also provided with an LED light.

[0059] When all protection parameters are normal, that is, when IN11.BW and IN12.BW are at a low level, the LED light on the protection ready component panel lights up, and 4 pairs of relay contact signals are output at the same time, which are respectively sent to the shutdown drive components of the three channels and the protection ready signal light in the main control room. When the reactor is put into operation, the shutdown drive component outputs a pair of relay contact signals to the protection ready component, and when IN11.BW and IN12.BW are at a high level, the LED light of the protection ready component is turned off. This embodiment can feed back the bypass result to the protection system by setting the protection ready component, so that the protection system can make corresponding protection preparations.

[0060] The reactor protection system is one of the most important safety systems in a nuclear power plant. It is mainly used to take rapid measures to protect the reactor, nuclear power plant equipment and personnel when abnormal conditions occur in the reactor operation.

[0061] The reactor protection system includes a sensor network, a signal processing unit and a logic judgment unit.

[0062] The sensor network includes various types of detectors, such as neutron detectors, temperature sensors, pressure sensors, etc. These sensors are distributed in various key parts of the reactor to monitor the operating status parameters of the reactor in real time, such as neutron flux, core temperature, coolant pressure, etc. The sensors have the characteristics of high precision, high reliability and fast response, and can timely and accurately transmit the status information of the reactor to other parts of the protection system.

[0063] The signal processing unit receives signals from sensors and processes and analyzes these signals. The signal processing unit usually uses advanced digital signal processing technology to quickly and accurately determine whether the operating status of the reactor is normal. For example, by analyzing the neutron flux signal, it can be determined whether the power level of the reactor is within the safe range; by analyzing the temperature and pressure signals, it can be determined whether the reactor's cooling system is operating normally.

[0064] The logic judgment unit performs logic judgment based on the information provided by the signal processing unit to determine whether the protection action needs to be initiated. The logic judgment unit usually adopts a redundant design to improve the reliability of the system. For example, if multiple sensors simultaneously detect an abnormal increase in the power of the reactor, the logic judgment unit will determine whether it is necessary to initiate the protection action based on the preset logic rules).

[0065] The nuclear reactor protection system operation bypass device of this embodiment is divided into two stages during the start-up process: thermal parameter protection operation bypass and periodic protection, periodic instrument failure protection and low power protection.

[0066] a. Thermal parameter protection operation bypass stage:

[0067] When the reactor is started, the thermal parameters are not in the normal range (for example, the reactor inlet flow is low) and tend to be protected. At this time, the three power protection instruments are in the lowest gear. The three normally open contacts are energized and output high level to the isolation component. The three photodiodes of the isolation component are turned on, and the three signals are input to the 1 / 3 logic component. OUT4->IN12.BW, OUT5->IN34.1 / N, OUT6->IN35.1 / N of the 1 / 3 logic component output high level, so that the thermal parameter protection signal cannot pass through the 1 / N logic component, thereby realizing the thermal parameter operation bypass. When any of the three power protection instruments leaves the minimum gear, the thermal parameter operation bypass is released.

[0068] b. Periodic protection, periodic instrument failure protection and low power protection stage:

[0069] When the power protectors all leave the minimum gear at the same time, the outputs of OUT1->IN11.BW, OUT2->IN31.1 / N, and OUT3->IN32.1 / N of the 1 / 3 logic component are high level, so that the cycle protection, cycle instrument fault protection, and power protection signals cannot pass through the 1 / N logic component, thereby completing the cycle protection, cycle instrument fault protection, and low-power operation bypass.

[0070] Overall, if Figure 7 As shown, when the reactor is started, the thermal parameters are not in the normal range (for example, the reactor inlet flow is low) and tend to be protected. At this time, the three power protection instruments are all in the lowest gear. The three normally open contacts output high levels to the isolation component due to the power supply. The three photodiodes of the isolation component are turned on, and the three signals are input to the 1 / 3 logic component. The OUT4->IN12.BW, OUT5->IN34.1 / N, and OUT6->IN35.1 / N of the 1 / 3 logic component output high levels, so that the thermal parameter protection signal cannot pass through the 1 / N logic component, thereby completing the operation bypass. When any of the three power protection instruments leaves the minimum gear, the operation bypass of the thermal parameters can be released. When the three power protection instruments leave the minimum gear at the same time, the outputs of OUT1->IN11.BW, OUT2->IN31.1 / N, and OUT3->IN32.1 / N of the 1 / 3 logic component are high levels, so that the periodic protection, periodic instrument failure protection, and low-power protection signals cannot pass through the 1 / N logic component, thereby achieving the operation bypass.

[0071] During the reactor startup process, some of the reactor's thermal parameters are in the protection range, which may erroneously trigger the protection action of the protection system, resulting in an emergency shutdown, and thus a failure to start the reactor. When the three power protection instruments all leave the minimum gear (when the reactor power increases to a certain value, the range of the power protection instrument will change), due to the existence of periodic protection, low-power protection, and periodic instrument failure protection, the protection system takes corresponding action and the reactor is shut down in an emergency. The setting of the nuclear reactor protection system operation bypass is to ensure that unplanned shutdowns are minimized and the operability of the reactor is improved while the protection system functions normally.

[0072] The bypass device of this embodiment has a simple structure, is reasonable and reliable, and is easy to use. It can realize the operation bypass of thermal parameters, periodic protection, periodic instrument protection failure, and low-power protection during the start-up process. At the same time, the operation bypass device also simplifies the design of the protection system. Through field tests, it is confirmed that the operation bypass device is safe and reliable and can meet the relevant requirements of reactor operation.

[0073] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A nuclear reactor protection system operation bypass device, characterized in that: The operation bypass device includes an input isolation component, a 1 / 3 logic component, a 1 / N logic component, and a protection ready component; The input isolation component is connected to the 1 / 3 logic component and the 1 / N logic component in sequence, and the input isolation component is used to receive the monitoring signals transmitted by the three power protection instruments and output corresponding switch quantity signals to the 1 / 3 logic component; The 1 / 3 logic component is used to perform logic processing based on the switch signal input by the input isolation component to obtain a bypass result, wherein the bypass result includes determining a first protection parameter that is allowed to pass through the 1 / N logic component and a second protection parameter that is not allowed to pass through the 1 / N logic component; The protection ready component is connected to the nuclear reactor protection system and the 1 / 3 logic component, and is used to feed back the bypass result to the protection system.

2. The operation bypass device according to claim 1, characterized in that: The input isolation component is composed of a 4N26 photoelectric isolator, including three phototransistors, which are respectively connected to the three power protectors to receive power operating condition node signals of the three power protectors, and the power operating condition node signals include a monitoring signal of whether the power protector is operating at the minimum gear.

3. The operation bypass device according to claim 2, characterized in that: The 1 / 3 logic component has three input terminals, which are respectively connected to the three phototransistors of the input isolation component to receive the switching value signals transmitted via the three phototransistors.

4. The operation bypass device according to claim 1, characterized in that: The 1 / N logic component includes thirty parameter signal input terminals, and thirty parameter signals are respectively input into the thirty parameter signal input terminals; When the reactor is operating normally, the input signals of the thirty parameter signal output terminals are all high level, and the output current of the 1 / N logic component is greater than 10mA; When an accident occurs in the reactor, the corresponding input parameter signal changes from high level to low level, the output current of the 1 / N logic component is 0, and an automatic shutdown signal is issued to realize the comprehensive shutdown function.

5. The operation bypass device according to claim 1, characterized in that: The protection ready component receives the level signal sent from the protection system, and simultaneously receives two level signals from the 1 / 3 logic component to the protection component; When all protection parameters are normal, the protection ready component outputs four pairs of relay contact signals, which are sent to the shutdown drive components of the three channels and the protection ready signal light in the main control room respectively; when the reactor is put into operation, the shutdown drive component outputs a pair of relay contact signals into the protection ready component, turning off the protection ready signal light.

6. The operation bypass device according to claim 3, characterized in that: The 1 / 3 logic component has six output terminals, namely a first output terminal OUT1, a second output terminal OUT2, a third output terminal OUT3, a fourth output terminal OUT4, a fifth output terminal OUT5, and a sixth output terminal OUT6; The 1 / N logic component includes four conditional signal input terminals, which are respectively connected to the second output terminal OUT2, the third output terminal OUT3, the fifth output terminal OUT5 and the sixth output terminal OUT6 of the 1 / 3 logic component.

7. The operation bypass device according to claim 6, characterized in that: When the second output terminal OUT2 and the third output terminal OUT3 of the 1 / 3 logic component are at a high level, the input conditions of the three parameter signal input terminals IN22 to IN24 of the 1 / N logic component are shutdown signals, which cannot pass through the 1 / N logic component; When the fifth output terminal OUT5 and the sixth output terminal OUT6 of the 1 / 3 logic component are at high level, the input conditions of the three parameter signal input terminals IN25 to IN30 of the 1 / N logic component are shutdown signals and cannot pass through the 1 / N logic component.

8. The operation bypass device according to claim 6, characterized in that: The protection ready component has two signal input terminals, and the two signal input terminals of the protection ready component are respectively connected to the first output terminal OUT1 and the fourth output terminal OUT4 of the 1 / 3 logic component.

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