CN118231011A - Nuclear power plant control system priority logic selection device and selection method thereof - Google Patents

Abstract

The invention belongs to the technical field of instrument control systems of nuclear power plants, and particularly relates to a priority logic selection device and a selection method of a control system of a nuclear power plant, wherein the selection method comprises the following steps: the device comprises a device shell, an LED display screen, a periodic test key switch, a plurality of signal indicating lamps, a power plug, an internal power module A, an internal power module B, a system power diagnosis module, a processing unit A, a processing unit B, an input channel module, an output channel module, a locking logic module, a plurality of isolation interfaces and a plurality of data wires; the invention realizes the priority management of different control system signals of the nuclear power plant on the driving equipment, and simultaneously fully considers the requirements of on-site operation maintenance and periodic test on the basis of considering the nuclear safety, and greatly reduces the misoperation risk caused by the test of on-site work by arranging the on-site locking key switch, thereby powerfully ensuring the safety of the nuclear power plant.

Description

Nuclear power plant control system priority logic selection device and selection method thereof

Technical Field

The invention belongs to the technical field of instrument control systems of nuclear power plants, and particularly relates to a priority logic selection device and a priority logic selection method for a control system of a nuclear power plant.

Background

The control system of the nuclear power plant provides various control and protection means and monitoring information to ensure that the nuclear power plant can safely, reliably and effectively operate under all normal, abnormal and accident conditions. Because the process of the process system of the nuclear power plant is complex, and multiple redundant protection measures are arranged, the nuclear power plant is provided with a plurality of digital control systems for controlling and monitoring equipment of different safety levels and different plants of the nuclear power plant. For a nuclear power plant reactor protection system, the main functions of the system are to execute emergency shutdown and start special safety facility actions under accident working conditions. Because the nuclear power plant is very important for safety, control signals from a reactor protection, as well as control signals from a diversified control system of the nuclear power plant, manual operation signals of an emergency control panel, manual operation signals of a backup control panel, control signals of a non-safety control system of the nuclear power plant and the like are received for safety special related equipment.

Because the security level, the quality assurance level and other attributes of different control systems are inconsistent, the priority order of the control signals of the different control systems are required to be uniformly controlled to safely and reliably control the local equipment, and meanwhile, the upstream security supervision department has a requirement on the nuclear security and also needs to have a safe and feasible periodic test function on the special nuclear security equipment.

Aiming at the requirements, a nuclear power plant control system priority logic selection device and a selection method thereof are required to be designed so as to realize the priority management of different control system signals of the nuclear power plant on driving equipment.

Disclosure of Invention

The invention provides a priority logic selection device and a priority logic selection method for a control system of a nuclear power plant, which are used for solving the technical problems that in the existing digital control system of the nuclear power plant, the signals of different control systems of the nuclear power plant cannot uniformly manage the priority of driving equipment, and the requirements of on-site operation maintenance and periodic test are lacked.

The technical scheme of the invention is as follows:

A nuclear power plant control system priority logic selection apparatus, comprising: the device comprises a device shell, an LED display screen, a periodic test key switch, a plurality of signal indicating lamps, a power plug, an internal power module A, an internal power module B, a system power diagnosis module, a processing unit A, a processing unit B, an input channel module, an output channel module, a locking logic module, a plurality of isolation interfaces and a plurality of data wires; the LED display screen, the periodic test key switch, the signal indicator lamps, the power plug, the communication input interface and the isolation interface are respectively arranged on the outer surface of the device shell;

The internal power supply module A, the internal power supply module B, the system power supply diagnosis module, the processing unit A, the processing unit B, the input channel module, the output channel module, the locking logic module, the isolation interface and the plurality of data wires are arranged in the device shell; the processing unit A and the processing unit B are respectively connected with an internal power supply module A and an internal power supply module B, and the processing unit A and the processing unit B are connected through a data line; the LED display screen is connected with the processing unit A through a data line, and the processing unit A transmits signals to the LED display screen according to the signal state and fault diagnosis state information;

The processing unit A is respectively connected with the input channel module, the output channel and the locking logic module through data lines; the processing unit B is also respectively connected with the input channel module, the output channel and the locking logic module through data lines; and the processing unit A and the processing unit B are connected with an isolation interface.

Logic diagnosis modules are arranged in the processing unit A and the processing unit B;

A channel signal diagnosis module is arranged in the input channel module; an output channel diagnosis module is arranged in the output channel module;

the communication input interface is connected with the input channel module through a data line.

And system power diagnosis modules are arranged in the internal power module A and the internal power module B.

The logic diagnosis modules in the processing unit A and the processing unit B are respectively connected with the communication signal diagnosis module, and the logic diagnosis modules in the processing unit A and the processing unit B are also respectively connected with the output channel diagnosis module; the locking logic module is connected with the periodic test key switch through a data line.

The processing unit A and the processing unit B are in redundant arrangement, and in normal operation, the processing unit A is a main processing unit, and the processing unit B is a standby processing unit; control signals of each control system of the nuclear power plant are sent into the processing unit A or the processing unit B through the input channel module.

The power plug is connected with the internal power module A and the internal power module B through data lines respectively.

The selection method of the nuclear power plant control system priority logic selection device comprises the following steps:

Step one, when a priority logic selection device is in a normal operation state, a channel input module receives external input signals from different control systems, fault diagnosis is carried out through a logic diagnosis module in a processing unit A or a processing unit B, whether a diagnosis fault exists or not, and if the diagnosis fault does not exist, the step two is carried out; and if the diagnosis fault occurs, the LED screen is connected with the processing unit through the diagnosis module, and contacts are connected to the LED screen for fault display.

Step two, after diagnosis, the logic diagnosis module in the processing unit A or the processing unit B directly outputs a driving device signal to an output channel if no diagnosis fault exists, and the output channel diagnosis module in the output channel diagnoses according to the signal type, and selects to output a normally open signal or a normally closed signal to the local device after diagnosis so as to drive the local device to operate;

Step three, when the priority logic selection device performs periodic test, a periodic test key switch knob is screwed to a test position and triggers a locking logic module, the locking logic module transmits test state signals to the processing unit A and the processing unit B through a data line, and at the moment, the outputs of the two processing units are locked; the processing unit A and the processing unit B send out locking success signals simultaneously through the isolation interface, and the priority logic selection device does not output signals to the outside any more; the LED display screen is used for displaying whether logic is executed or not, so that whether the test is successful or not is displayed.

In the first step, the external input signals from each control system adopt dry contact signals, and the first step further comprises the following steps: when external input signals of different control systems enter the channel input module, the channel signal diagnosis module is used for checking the input channel signals and checking whether the input signals are normal.

The second step further comprises: if only one priority signal of the control system is input in the first step, the processing unit automatically takes the channel input signal as input to carry out logic processing and outputs a corresponding signal;

If two signals of different priority control systems are input at the same time, any one of the processing units A or B processes the input two signals at the same time, signals with high priority are used as logic input according to a pre-configured priority sequence, and signals are correspondingly output to local equipment according to the input to drive the local equipment to act;

If an input signal is already in the processing unit, the processing unit performs logic processing according to the input signal and outputs corresponding logic; at this time, the processing unit receives the priority input signal of another control system, and performs logic control processing on the received input signal; if the priority of the input signal received later is lower than that of the initial signal, switching is not performed, and the original input is kept as the input of logic processing; if the received priority is higher than the initial signal, the logic diagnosis module in the processing unit performs logic processing on the signal with higher priority received after the signal participating in logic processing is switched to the signal with higher priority, and outputs logic output corresponding to the input signal, so as to drive the action of local equipment.

The invention has the beneficial effects that:

The priority logic selection device provided by the invention is mainly used for receiving signals from a plurality of control systems such as a security level digital control system, a diversified control system, an emergency manual control panel, a backup control panel and the like of a nuclear power plant. After driving signals from different system equipment enter the device provided by the patent, the driving signals are finally output to a field device driver through the preferential selection logic operation processing in the device, so that the priority management of the driving equipment by the signals of the different control systems of the nuclear power plant is realized. Meanwhile, according to the requirements of field maintenance work and periodic tests, an on-site locking key switch is further arranged on the module, so that direct locking output on the clamping piece is realized, the risk that equipment malfunction is possibly caused by the tests is eliminated, and the safety of the nuclear power plant is ensured.

In addition, after the priority logic selection device provided by the invention is used, the control system of the special safety facility of the nuclear power plant can be generally controlled, and the safety of local equipment is ensured; meanwhile, due to the fact that the on-site key knob is arranged, the output signal of the device can be shielded before periodic test, the risk of misoperation of local equipment caused by test signals is avoided, and the safety performance of the equipment is improved.

The module front is also provided with a signal indicator lamp, so that the failure generation reason of the device can be rapidly positioned, and meanwhile, the LED display screen is arranged, so that the device internal failure generation is also indicated and positioned.

In conclusion, the invention realizes the priority management of different control system signals of the nuclear power plant on the driving equipment, and simultaneously fully considers the requirements of on-site operation maintenance and periodic test on the basis of considering the nuclear safety, and greatly reduces the risk of misoperation caused by the test in on-site work by arranging the on-site locking key switch, thereby powerfully ensuring the safety of the nuclear power plant.

Drawings

FIG. 1 is a functional diagram of a priority logic selection device of a digital control system of a nuclear power plant according to the present invention.

Detailed Description

The following describes a control system priority logic selection device and a selection method thereof for a nuclear power plant in detail with reference to the accompanying drawings and embodiments.

A nuclear power plant control system priority logic selection apparatus, comprising: the device comprises a device shell, an LED display screen, a periodic test key switch, a plurality of signal indicating lamps, a power plug, an internal power module A, an internal power module B, a system power diagnosis module, a processing unit A, a processing unit B, an input channel module, an output channel module, a locking logic module, a plurality of isolation interfaces and a plurality of data wires; the LED display screen, the periodic test key switch, the signal indicator lamps, the power plug, the communication input interface and the isolation interface are respectively arranged on the outer surface of the device shell;

The internal power supply module A, the internal power supply module B, the system power supply diagnosis module, the processing unit A, the processing unit B, the input channel module, the output channel module, the locking logic module, the isolation interface and the plurality of data wires are arranged in the device shell; the processing unit A and the processing unit B are respectively connected with an internal power supply module A and an internal power supply module B, and the processing unit A and the processing unit B are connected through a data line; the LED display screen is connected with the processing unit A through a data line, and the processing unit A transmits signals to the LED display screen according to the signal state and fault diagnosis state information;

The processing unit A is respectively connected with the input channel module, the output channel and the locking logic module through data lines; the processing unit B is also respectively connected with the input channel module, the output channel and the locking logic module through data lines; and the processing unit A and the processing unit B are connected with an isolation interface.

Logic diagnosis modules are arranged in the processing unit A and the processing unit B;

A channel signal diagnosis module is arranged in the input channel module; an output channel diagnosis module is arranged in the output channel module;

the communication input interface is connected with the input channel module through a data line.

And system power diagnosis modules are arranged in the internal power module A and the internal power module B.

The logic diagnosis modules in the processing unit A and the processing unit B are respectively connected with the communication signal diagnosis module, and the logic diagnosis modules in the processing unit A and the processing unit B are also respectively connected with the output channel diagnosis module; the locking logic module is connected with the periodic test key switch through a data line.

The processing unit A and the processing unit B are in redundant arrangement, and in normal operation, the processing unit A is a main processing unit, and the processing unit B is a standby processing unit; control signals of each control system of the nuclear power plant are sent into the processing unit A or the processing unit B through the input channel module.

The power plug is connected with the internal power module A and the internal power module B through data lines respectively.

The selection method of the nuclear power plant control system priority logic selection device comprises the following steps:

Step one, when a priority logic selection device is in a normal operation state, a channel input module receives external input signals from different control systems, fault diagnosis is carried out through a logic diagnosis module in a processing unit A or a processing unit B, whether a diagnosis fault exists or not, and if the diagnosis fault does not exist, the step two is carried out; and if the diagnosis fault occurs, the LED screen is connected with the processing unit through the diagnosis module, and contacts are connected to the LED screen for fault display.

Step two, after diagnosis, the logic diagnosis module in the processing unit A or the processing unit B directly outputs a driving device signal to an output channel if no diagnosis fault exists, and the output channel diagnosis module in the output channel diagnoses according to the signal type, and selects to output a normally open signal or a normally closed signal to the local device after diagnosis so as to drive the local device to operate;

Step three, when the priority logic selection device performs periodic test, a periodic test key switch knob is screwed to a test position and triggers a locking logic module, the locking logic module transmits test state signals to the processing unit A and the processing unit B through a data line, and at the moment, the outputs of the two processing units are locked; the processing unit A and the processing unit B send out locking success signals simultaneously through the isolation interface, and the priority logic selection device does not output signals to the outside any more; the LED display screen is used for displaying whether logic is executed or not, so that whether the test is successful or not is displayed.

In the first step, the external input signals from each control system adopt dry contact signals, and the first step further comprises the following steps: when external input signals of different control systems enter the channel input module, the channel signal diagnosis module is used for checking the input channel signals and checking whether the input signals are normal.

The second step further comprises: if only one priority signal of the control system is input in the first step, the processing unit automatically takes the channel input signal as input to carry out logic processing and outputs a corresponding signal;

If two signals of different priority control systems are input at the same time, any one of the processing units A or B processes the input two signals at the same time, signals with high priority are used as logic input according to a pre-configured priority sequence, and signals are correspondingly output to local equipment according to the input to drive the local equipment to act;

If an input signal is already in the processing unit, the processing unit performs logic processing according to the input signal and outputs corresponding logic; at this time, the processing unit receives the priority input signal of another control system, and performs logic control processing on the received input signal; if the priority of the input signal received later is lower than that of the initial signal, switching is not performed, and the original input is kept as the input of logic processing; if the received priority is higher than the initial signal, the logic diagnosis module in the processing unit performs logic processing on the signal with higher priority received after the signal participating in logic processing is switched to the signal with higher priority, and outputs logic output corresponding to the input signal, so as to drive the action of local equipment.

Specific examples:

the priority logic processing means in this example is arranged to prioritize the input signals from the respective control systems, and for each local device a priority logic selection means is arranged to prioritize the signals input upstream.

In this example, the priority logic processing device can access signals of 5 different control systems, and the signals of each control system are directly accessed to the device in a hard-wired mode. In this example, two processing units are set in the priority logic processing device, where processing unit a is a main processing unit and processing unit B is a standby processing unit. Under normal conditions, the processing unit A independently operates, and the processing unit B is used as a standby; when the processing unit A fails, the logic processing is automatically switched to the processing unit B, and the arrangement of the double processing units is mainly used for improving the redundancy of the device and ensuring the safety of the device.

In this embodiment, the priority order of the control signals of the different control systems is that the security level digital control system is priority 1, the diversity control system is priority 2, the emergency manual control panel is priority 3, the non-security level digital control system is priority 4, and the backup control panel is priority 5 (priority 1 > 2 > 3 > 4 > 5).

Because each priority logic selecting device only controls one device, each priority logic selecting device is connected with a priority logic managing device (the priority logic managing device is responsible for the management of the priority logic selecting device, and the related technology is not embodied in the invention), and each processing unit is respectively connected with the priority logic managing device through an isolation interface based on redundancy safety consideration. The output channel module also receives a state feedback signal from the field on-site equipment, and sends the state feedback signal to the priority logic management device through the processing unit A or the processing unit B, and then sends the state feedback signal to each control system for displaying the state of the field equipment.

The execution of the periodic test is controlled by each control system, related control signals are directly triggered, the signals enter the processing unit A or the processing unit B through the input channels, the processing unit generates output signals after logic processing, the processing unit does not generate signal output after entering the periodic test mode, the processing unit enters the output locking mode, related logic is transmitted to the priority logic management device through the isolation interface and then is transmitted to the display system to display whether the logic is executed or not, and whether the test is successful or not is displayed.

In this example, the meaning of the signal lights on the device is as follows:

Meanwhile, all lamps are provided with red, and when priority input signal faults, output signal faults, on-site equipment feedback faults, power supply faults or periodic test failures occur, the corresponding indicator lamps turn red.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims (8)

1. A nuclear power plant control system priority logic selection apparatus, comprising: the device comprises a device shell, an LED display screen, a periodic test key switch, a plurality of signal indicating lamps, a power plug, an internal power module A, an internal power module B, a system power diagnosis module, a processing unit A, a processing unit B, an input channel module, an output channel module, a locking logic module, a plurality of isolation interfaces and a plurality of data wires; the LED display screen, the periodic test key switch, the signal indicator lamps, the power plug, the communication input interface and the isolation interface are respectively arranged on the outer surface of the device shell;

The internal power supply module A, the internal power supply module B, the system power supply diagnosis module, the processing unit A, the processing unit B, the input channel module, the output channel module, the locking logic module, the isolation interface and the plurality of data wires are arranged in the device shell; the processing unit A and the processing unit B are respectively connected with an internal power supply module A and an internal power supply module B, and the processing unit A and the processing unit B are connected through a data line; the LED display screen is connected with the processing unit A through a data line, and the processing unit A transmits signals to the LED display screen according to the signal state and fault diagnosis state information;

The processing unit A is respectively connected with the input channel module, the output channel and the locking logic module through data lines; the processing unit B is also respectively connected with the input channel module, the output channel and the locking logic module through data lines; and the processing unit A and the processing unit B are connected with an isolation interface.

2. The nuclear power plant control system priority logic selection apparatus of claim 1 wherein: logic diagnosis modules are arranged in the processing unit A and the processing unit B;

A channel signal diagnosis module is arranged in the input channel module; an output channel diagnosis module is arranged in the output channel module;

the communication input interface is connected with the input channel module through a data line.

And system power diagnosis modules are arranged in the internal power module A and the internal power module B.

3. The nuclear power plant control system priority logic selection apparatus of claim 2 wherein: the logic diagnosis modules in the processing unit A and the processing unit B are respectively connected with the communication signal diagnosis module, and the logic diagnosis modules in the processing unit A and the processing unit B are also respectively connected with the output channel diagnosis module; the locking logic module is connected with the periodic test key switch through a data line.

4. A nuclear power plant control system priority logic selection apparatus as recited in claim 3 wherein: the processing unit A and the processing unit B are in redundant arrangement, and in normal operation, the processing unit A is a main processing unit, and the processing unit B is a standby processing unit; control signals of each control system of the nuclear power plant are sent into the processing unit A or the processing unit B through the input channel module.

5. The nuclear power plant control system priority logic selection apparatus of claim 4 wherein: the power plug is connected with the internal power module A and the internal power module B through data lines respectively.

6. A selection method of a nuclear power plant control system priority logic selection device according to any one of claims 1 to 5, characterized by comprising the steps of:

Step one, when a priority logic selection device is in a normal operation state, a channel input module receives external input signals from different control systems, fault diagnosis is carried out through a logic diagnosis module in a processing unit A or a processing unit B, whether a diagnosis fault exists or not, and if the diagnosis fault does not exist, the step two is carried out; and if the diagnosis fault occurs, the diagnosis module is connected with the processing unit, and the contact points are connected to the LED screen to display the fault.

Step two, after diagnosis, the logic diagnosis module in the processing unit A or the processing unit B directly outputs a driving device signal to an output channel if no diagnosis fault exists, and the output channel diagnosis module in the output channel diagnoses according to the signal type, and selects to output a normally open signal or a normally closed signal to the local device after diagnosis so as to drive the local device to operate;

Step three, when the priority logic selection device performs periodic test, a periodic test key switch knob is screwed to a test position and triggers a locking logic module, the locking logic module transmits test state signals to the processing unit A and the processing unit B through a data line, and at the moment, the outputs of the two processing units are locked; the processing unit A and the processing unit B send out locking success signals simultaneously through the isolation interface, and the priority logic selection device does not output signals to the outside any more; the LED display screen is used for displaying whether logic is executed or not, so that whether the test is successful or not is displayed.

7. The nuclear power plant control system priority logic selection apparatus of claim 6 wherein: in the first step, the external input signals from each control system adopt dry contact signals, and the first step further comprises the following steps: when external input signals of different control systems enter the channel input module, the channel signal diagnosis module is used for checking the input channel signals and checking whether the input signals are normal.

8. The nuclear power plant control system priority logic selection device of claim 7, wherein: the second step further comprises: if only one priority signal of the control system is input in the first step, the processing unit automatically takes the channel input signal as input to carry out logic processing and outputs a corresponding signal;

If two signals of different priority control systems are input at the same time, any one of the processing units A or B processes the input two signals at the same time, signals with high priority are used as logic input according to a pre-configured priority sequence, and signals are correspondingly output to local equipment according to the input to drive the local equipment to act;

If an input signal is already in the processing unit, the processing unit performs logic processing according to the input signal and outputs corresponding logic; at this time, the processing unit receives the priority input signal of another control system, and performs logic control processing on the received input signal; if the priority of the input signal received later is lower than that of the initial signal, switching is not performed, and the original input is kept as the input of logic processing; if the received priority is higher than the initial signal, the logic diagnosis module in the processing unit performs logic processing on the signal with higher priority received after the signal participating in logic processing is switched to the signal with higher priority, and outputs logic output corresponding to the input signal, so as to drive the action of local equipment.