A bypass device for the operation of a nuclear reactor protection system

Abstract

The present invention provides a bypass device for the operation of a nuclear reactor protection system, which includes an input isolation component, a 1 / 3 logic component, a 1 / N logic component, and a protection ready component. The bypass device for the operation of the nuclear reactor protection system can achieve bypass of the operation of thermal parameters, period protection, period instrument protection failure, and low-power protection during the reactor startup process. At the same time, the bypass device for the operation also simplifies the design of the protection system. Through on-site tests, it is confirmed that the bypass device for the operation is safe and reliable and can meet the relevant requirements for reactor operation.

Description

Technical Field

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

[0002] The protection system of a reactor is crucial for the safe operation of the reactor. When designing the protection system, it is always desired that the system operates safely and reliably, that is, no spurious trips and refusals to trip are expected during the operation of the reactor. However, in practice, this is impossible to achieve. The foreign requirement for the refusal rate of the protection system of nuclear power plants is less than 10 -6 times / year, and the spurious actuation rate is less than 1 time / year. GB4083 puts forward the requirement for power reactors that "the system safety failure (false reactor trip rate) of each variable shall not be greater than once a year".

[0003] During the reactor startup process, due to some thermohydraulic parameters, period protection, low-power protection, and period instrument failure protection alarm signals or reactor trip signals in the protection range, it is easy to cause an emergency false reactor trip (in the reactor), resulting in too frequent startup failures. Summary of the Invention

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

[0005] The present invention provides a bypass device for the operation of a nuclear reactor protection system, and the bypass device includes 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 sequentially connected to the 1 / 3 logic component and the 1 / N logic component. The input isolation component is used to receive the monitoring signals transmitted by the three power protection instruments and output corresponding switching signals to the 1 / 3 logic component;

[0007] The 1 / 3 logic component is used to perform logic processing based on the switching signals input by the input isolation component to obtain a bypass result, and the bypass result includes a first protection parameter that is determined to allow passage through the 1 / N logic component and a second protection parameter that does not allow passage 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 feedback the bypass result to the protection system.

[0009] Optionally, the input isolation component consists of a 4N26 opto-isolator, which includes three opto-transistors to be respectively connected to the three power protection meters and receive the power operation condition node signals of the three power protection meters. The power operation condition node signals include the monitoring signals of whether the power protection meter operates in the minimum gear.

[0010] Optionally, the 1 / 3 logic component has three input terminals, which are respectively connected to the three opto-transistors of the input isolation component to receive the digital quantity signals transmitted via the three opto-transistors.

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

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

[0014] Optionally, 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;

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

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

[0017] The 1 / N logic component includes four condition 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 high level, the input conditions of the three parameter signal input terminals IN22 - IN24 of the 1 / N logic component are reactor shutdown signals and 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-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] In the nuclear reactor protection system operation bypass device provided by the present invention, during the reactor startup process, some thermal parameters of the reactor are in the protection range, which may erroneously trigger the protection action of the protection system and lead to an emergency shutdown, resulting in a failed startup. When all three power protection meters leave the minimum range (when the reactor power increases to a certain value, the range of the power protection meter will change), due to the presence of period protection, low power protection, and period instrument fault protection, the protection system will take corresponding actions and the reactor will be shut down emergently. The setting of the nuclear reactor protection system operation bypass is to ensure that, on the premise that the protection system functions normally, the unplanned shutdowns are minimized as much as possible and the operability of the reactor is improved.

[0022] The nuclear reactor protection system operation bypass device of the present invention has a simple, reasonable, reliable and convenient structure, and can achieve the operation bypass of thermal parameters, period protection, period instrument protection fault, and low power protection during the startup process. At the same time, the operation bypass device also simplifies the design of the protection system. Through on-site 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 will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

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

[0025] Figure 1 is a schematic structural diagram of the nuclear reactor protection system operation bypass device according to an embodiment of the present invention;

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

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

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

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

[0030] Figure 6 It is the schematic diagram of the protection ready component in the operation bypass device of the nuclear reactor protection system according to the embodiment of the present invention;

[0031] Figure 7 It is the schematic diagram of the working principle of the operation bypass device of the nuclear reactor protection system according to the embodiment of the present invention. Specific embodiments

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0034] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed", etc. 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The following describes the preferred embodiments of the present invention with reference to 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 bypass device for the operation of a nuclear reactor protection system. The bypass device for operation can complete an automatic operation bypass function according to the change of the gear range of a power protection instrument. As Figure 1 shown, the bypass device for operation 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 sequentially connected to the 1 / 3 logic component and the 1 / N logic component. The input isolation component is used to receive the monitoring signals transmitted by the three power protection instruments and output corresponding digital signals (i.e., whether the three power instruments are at the minimum gear node signals) to the 1 / 3 logic component; the 1 / 3 logic component is used to perform logic processing based on the digital signals input by the input isolation component to obtain a bypass result, and the bypass result includes a first protection parameter that determines to allow passing through the 1 / N logic component and a second protection parameter that does not allow passing 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 feedback the bypass result to the protection system.

[0037] The bypass device for the operation of the nuclear reactor protection system provided by the embodiment of the present invention can realize the operation bypass of thermal parameters, period protection, period instrument fault protection, and low-power protection during the reactor startup process. The setting of the bypass for the nuclear reactor protection system is to ensure normal reactor startup on the premise that the functions of the protection system play a normal role, and improve the protection reliability of the protection system. At the same time, the setting of this reactor 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] I. Input isolation component

[0039] The input isolation component is composed of 4N26 opto-isolators. When the monitoring signals transmitted from the three power protection instruments change, three opto-triodes output digital signals.

[0040] When the power protection instrument is in the minimum gear, its corresponding normally open contact (energized) is in a closed state, and at this time, the opto-triode of the input isolation component is turned on. When the power protection instrument leaves the minimum gear, its normally open contact is disconnected, and at this time, the opto-triode of the input isolation component is disconnected. For the main principle of the input isolation component, see Figures 2 to 3 , Figure 3 which schematically shows a diagram of a group of opto-triodes. In actual application, three opto-triodes can be set according to requirements to correspondingly output digital signals (i.e., whether the three power instruments are at the minimum gear node signals).

[0041] The input isolation component has a first input terminal IN1, a second input terminal IN2, and a third input terminal IN3, as well as 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 power protection meters to receive monitoring signals transmitted by three power protection meters.

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

[0043] II. 1 / 3 Logic Component

[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, it triggers the corresponding judgment and changes the level of the output terminal of the 1 / 3 component.

[0045] The node signal of the power operation condition (i.e., whether it is in the minimum gear) of the power protection meter is first input to 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 three output terminals of the input isolation component, the first output terminal OUT1, the second output terminal OUT2, and the third output terminal OUT3 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 in it. The 1 / 3 logic component is provided with two LED lights, such as Figure 4 H1 and H2 in it. When the three power protection meters are all in the minimum gear at the same time, the second LED on the panel of the 1 / 3 logic component ( Figure 4 H2 in it) has a green light on. At this time, the outputs of OUT4->IN12.BW, OUT5->IN34.1 / N, and OUT6->IN35.1 / N (the three outputs of the logic component) of the 1 / 3 logic component are at a high level, so that the thermal parameter protection signal cannot pass through the 1 / N logic component, thus completing the operation bypass.

[0046] When any one of the three power protection meters leaves the minimum gear, the operation bypass of the thermal parameters can be lifted. When the three power protection meters all leave the minimum gear at the same time, the first LED on the panel of the 1 / 3 logic component ( Figure 4 H1 in it) has a green light on. At this time, the outputs of OUT1->IN11.BW, OUT2->IN31.1 / N, and OUT3->IN32.1 / N (the three outputs of the logic component) of the 1 / 3 logic component are at a high level, so that the cycle protection, cycle instrument fault protection, and low power protection signals cannot pass through the 1 / N logic component, thus realizing 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 function of unlocking the accident signal alarm for the relay contacts. See the circuit diagram of the 1 / 3 logic component inFigure 4 , one-third of the logic components have six output terminals, namely the first output terminal OUT1, the second output terminal OUT2, the third output terminal OUT3, the fourth output terminal OUT4, the fifth output terminal OUT5, and the sixth output terminal OUT6.

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

[0048] III. 1 / N Logic Component

[0049] The 1 / N logic component is used for N identical channels to work 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 as follows: 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 at a high level, and the output current of the 1 / N logic component is greater than 10 mA. When an accident occurs in the reactor, any one of the input parameter signals obtained correspondingly changes from a high level to a low level, the output current of the 1 / N logic component is 0, and an automatic reactor shutdown signal is issued to achieve the comprehensive reactor shutdown function.

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

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

[0052] The main function of the reactor trip drive assembly is to achieve the emergency shutdown of the reactor. During the operation of the nuclear reactor, when abnormal conditions occur (such as accidents where control rods are uncontrollably lifted, coolant is lost, etc.), the reactor trip drive assembly can quickly insert the control rods into the core. Since control rods can absorb neutrons, the chain reaction can be rapidly stopped, thus ensuring the safety of the reactor and preventing the further deterioration of the accident.

[0053] The reactor trip failure alarm assembly is mainly used to monitor the operating status of the reactor trip system. When a situation occurs where a reactor trip action should be triggered (such as some faults or abnormal parameters reaching the reactor trip threshold), but the reactor trip system does not respond normally (i.e., reactor trip failure), this assembly will emit an alarm signal. This signal allows the staff to promptly discover the problem of the reactor trip mechanism failure, so as to take other emergency measures such as manual operation to shut down the reactor, avoiding serious accidents that may be caused by the failure of the reactor trip and ensuring the safety of the nuclear reactor.

[0054] The input terminals IN31.1 / N, IN32.1 / N, IN34.1 / N, IN35.1 / N of the 1 / N logic assembly serve as conditional signal input terminals, respectively receiving the 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 assembly, that is: 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, that is, 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, that is, OUT5 -> IN34.1 / N, OUT6 -> IN35.1 / N. When OUT2 -> IN31.1 / N and OUT3 -> IN32.1 / N are at high level, the input conditions of the three parameter signal input terminals IN22 to IN24 of the 1 / N logic component are shutdown signals (period protection, instrument failure protection, low power protection), and cannot pass through the 1 / N logic component. When OUT5 -> IN34.1 / N and OUT6 -> IN35.1 / N 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 (thermal parameters), and cannot pass through the 1 / N logic component. IN25, IN26, IN27, IN28, IN29, and IN30 respectively represent signals of low reactor coolant flow rate, high reactor outlet temperature, high reactor inlet temperature, low reactor inlet pressure, and low reactor outlet pressure.

[0056] IV. Protect the ready component

[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 signals sent from the protection system (referring to the signals indicating 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 low level, the LED light on the protection ready component panel lights up, and at the same time, 4 pairs of relay contact signals are output, which are sent to the shutdown drive components of three channels and the protection ready signal lights in the main control room respectively. When the reactor is put into operation, a pair of relay contact signals are output from the shutdown drive component into the protection ready component, and when IN11.BW and IN12.BW are at high level, the LED light of the protection ready component is turned off. In this embodiment, by setting the protection ready component, the bypass result can be fed back to the protection system, enabling the protection system to make corresponding protection preparations.

[0060] The reactor protection system is one of the crucial safety systems in a nuclear power plant, mainly used to quickly take measures to protect the reactor, nuclear power plant equipment and personnel safety when abnormal situations occur during 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 at various key parts of the reactor, and they monitor the operating state 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 state information of the reactor to other parts of the protection system.

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

[0064] The logic judgment unit makes a logical judgment based on the information provided by the signal processing unit to determine whether a 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 that the power of the reactor has risen abnormally, the logic judgment unit will judge whether to) according to the preset logic rules.

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

[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 startup process of the reactor, some thermal parameters of the reactor are within the protection range, which may accidentally trigger the protection actions of the protection system, leading to an emergency shutdown and thus a failed startup. When all three power protection instruments leave the minimum range (when the reactor power increases to a certain value, the range of the power protection instrument will change), due to the existence of period protection, low-power protection, and period instrument failure protection, the protection system will take corresponding actions and the reactor will shut down emergently. The setting of the bypass for the operation of the nuclear reactor protection system is to minimize unplanned shutdowns as much as possible while ensuring the normal functioning of the protection system, and to improve the operability of the reactor.

[0072] The bypass device of this embodiment has a simple, reasonable, reliable and convenient structure, and can achieve the operation bypass of thermal parameters, period protection, period instrument protection failure, and low-power protection during the startup process. At the same time, the operation bypass device also simplifies the design of the protection system. Through on-site 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 equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A bypass device for the operation of a nuclear reactor protection system, characterized in that, The operating 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 sequentially connected to the 1 / 3 logic component and the 1 / N logic component. The input isolation component is configured to receive monitoring signals transmitted by three power protection meters and output corresponding digital signals to the 1 / 3 logic component; The 1 / 3 logic component is configured to perform logic processing based on the digital signals input by the input isolation component to obtain a bypass result. The bypass result includes a first protection parameter that is determined to be 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 configured to feedback the bypass result to the protection system; The input isolation component is composed of 4N26 opto-isolators, including three opto-transistors, which are respectively connected to the three power protection meters to receive the power operation condition node signals of the three power protection meters. The power operation condition node signals include monitoring signals indicating whether the power protection meters are operating in the minimum gear; The 1 / 3 logic component has three input terminals, which are respectively connected to the three opto-transistors of the input isolation component to receive the digital signals transmitted through the three opto-transistors.

2. The operating bypass device according to claim 1, wherein 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; 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 10 mA; 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 reactor trip signal is issued to implement the comprehensive reactor trip function.

3. The operating bypass device according to claim 1, characterized in that, The protection ready component receives the level signal sent from the protection system, and at the same time 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 respectively sent to the reactor trip drive components of three channels and the protection ready signal lamp in the main control room; when the reactor is put into operation, the reactor trip drive component outputs a pair of relay contact signals into the protection ready component to turn off the protection ready signal lamp.

4. The operating bypass device according to claim 1, wherein The 1 / 3 logic component has six output terminals, which are respectively the first output terminal OUT1, the second output terminal OUT2, the third output terminal OUT3, the fourth output terminal OUT4, the fifth output terminal OUT5, and the sixth output terminal OUT6; The 1 / N logic component includes four condition 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.

5. The operation bypass device according to claim 4, wherein When the second output terminal OUT2 and the third output terminal OUT3 of the 1 / 3 logic component are at high level, the input conditions of the three parameter signal input terminals IN22 - IN24 of the 1 / N logic component are reactor trip signals and 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 six 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.

6. The operating bypass device according to claim 4, wherein 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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