A signal indication method and system for interlocking safety injection protection

Abstract

This invention discloses a signal indication method and system for interlocking safety injection protection, relating to the field of nuclear power plant instrumentation and control technology. The signal indication method for interlocking safety injection protection provided by this solution adds an additional indication signal to each diversity subgroup. The indication signal and the safety injection protection interlock signal are jointly processed by the correct interlocking logic to generate a signal display result. By combining the indication signal and the safety injection protection interlock signal with the correct interlocking logic to determine the on / off status of the safety injection function of the entire nuclear reactor protection system in a timely manner, it also accurately reflects the on / off status of the safety injection function of each diversity subgroup, thereby reducing the risk of system malfunction.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant instrumentation and control technology, specifically to a signal indication method and system for interlocking safety injection protection. Background Technology

[0002] The reactor protection system is designed with a dedicated safety injection protection function that triggers a response. During the process of reducing the reactor power, the average temperature signal of the reactor coolant is mainly used as the indication signal. When the indication signal that the average temperature of the reactor coolant is within acceptable limits appears, the operator can operate the corresponding safety injection switch in the main control room to lock the above safety injection function. When the reactor power rises to the point where the indication signal that the average temperature of the reactor coolant is within acceptable limits disappears, the above safety injection function will be automatically activated.

[0003] Each protection channel is designed with an indicator signal. When the indicator signal is lit, it indicates that the above-mentioned safety injection function has been locked. Conversely, when the indicator signal disappears, it indicates that the above-mentioned safety injection function has been reactivated.

[0004] According to the requirements of the diversity grouping design, the safety injection protection function needs to be implemented simultaneously in the diverse subgroups of the reactor protection system. The same indicator signal generated in multiple subgroups is finally illuminated on the operator's workstation after an "OR" logic operation. In this way, the indicator signal will only disappear when the safety injection function switches of all subgroups are engaged. Thus, the operator can confirm that the safety injection function switches of two subgroups are all engaged by the disappearance of the indicator signal. However, this design also means that during the reactor unit power reduction process, if the safety injection function switch of one subgroup is blocked, the indicator light will be illuminated. Therefore, the operator cannot confirm whether the safety injection function switches of multiple subgroups have been blocked. If the power plant continues to carry out power reduction operation at this time, there is a risk of accidental triggering of safety injection. Summary of the Invention

[0005] The technical problem this invention aims to solve is that traditional indication methods applied to diverse subgroups of reactor protection systems will illuminate an indicator light if any subgroup locks out the injection safety function switch. Operators cannot confirm whether the injection safety function switches of multiple subgroups have been locked out. If the power plant continues to implement power reduction operations, there is a risk of accidental triggering of the injection safety function. This invention aims to provide a signal indication method and system for locking out injection safety protection. An additional indication signal is collected for each diverse subgroup. The indication signal and the injection safety protection lockout signal are combined and correctly processed by the lockout logic to generate a signal display result. The indication signal ensures that the injection safety function switches of all diverse subgroups are locked out, thus accurately reflecting the situation where the injection safety function is not completely locked out when the indication signal is present.

[0006] It accurately indicates situations where the aforementioned safety injection function is not fully locked even when an indication signal is present.

[0007] This invention is achieved through the following technical solution:

[0008] This solution provides a signal indication method for interlocking safety injection protection, including the following steps:

[0009] Obtain indication signals and safety injection protection interlock signals from the nuclear reactor protection system;

[0010] The correct interlocking logic is determined based on the indication signals and safety interlocking signals of each diverse subgroup.

[0011] The correct interlocking logic determination result is displayed as a signal.

[0012] The working principle of this solution is as follows: Traditional indication methods applied to the diverse subgroups of the reactor protection system will illuminate the indicator light if any subgroup locks the injection function switch. Operators cannot confirm whether the injection functions of multiple subgroups have been locked. If the power plant continues to implement power reduction operations, there is a risk of accidental triggering of injection. The signal indication method for locking injection protection provided by this solution adds an additional indication signal to each diverse subgroup. The indication signal and the injection protection lockout signal are combined and correctly judged by the lockout logic to generate the signal display result. By combining the indication signal and the injection protection lockout signal with the correct lockout logic judgment process, the switch status of the injection function of the entire nuclear reactor protection system is judged and indicated in a timely manner, while also accurately reflecting the switch status of the injection function of each diverse subgroup.

[0013] A further optimized scheme is that the indication signal is the average temperature value T of the reactor coolant. avg Below the temperature threshold T a .

[0014] A further optimized solution is that the method for obtaining the safety protection lockout signal is as follows:

[0015] Obtain the steam pipe pressure P and the average reactor coolant temperature T of the current diverse subgroup from the nuclear reactor protection system. avg and steam pipeline flow rate V;

[0016] Determine if the following conditions are met:

[0017] Scenario a: The steam pipeline pressure P is less than the pressure threshold P. a ;

[0018] Scenario b, reactor coolant average temperature T avg Below the temperature threshold T a ;

[0019] Case c: The steam pipeline flow rate V is greater than the flow rate threshold V. a ;

[0020] When conditions a and c are met simultaneously, or conditions b and c are met simultaneously, a safety protection lockout signal is obtained.

[0021] A further optimized solution is that the correct locking logic determination includes the following process:

[0022] First, perform a blocking logic determination on each diversity subgroup to collect the first indication signal;

[0023] When any diversity subgroup receives the first indication signal, the signal display is executed.

[0024] A further optimized solution is that the locking logic determination process includes:

[0025] When both the safety protection interlock signal and the indication signal are received simultaneously, the indication signal is obtained.

[0026] A further optimized solution is that the diversity subgroup has two groups.

[0027] The traditional method involves each subgroup receiving a safety injection protection interlock signal, performing an OR operation, and finally illuminating an indicator signal on the operator's workstation. This indicator signal only disappears when the safety injection function switches of both subgroups are engaged, allowing the operator to confirm that all safety injection function switches in both subgroups are activated. However, this design also means that during power reduction, if even one subgroup's safety injection function switch is interlocked, the indicator light will illuminate, making it impossible for the operator to confirm that all subgroups' safety injection function switches are interlocked. If the power plant continues to reduce power under these circumstances, there is a risk of accidental triggering of the safety injection. This proposed solution adds an additional indicator signal to each diverse subgroup, generated by performing an AND operation between this indicator signal and the aforementioned condition indicating that the safety injection function switch is not interlocked. The indicator signals from the two diversity subgroups are sent to the operator workstation after an OR operation. This ensures that the first indicator signal on the operator workstation will only disappear after all the safety function switches of all diversity subgroups have been locked. This accurately indicates the situation where the safety function switches of all the aforementioned diversity subgroups have not been fully locked when the indicator signal is present, thereby reducing the risk of system malfunction.

[0028] In accordance with the diversity grouping design requirements, an additional indicator signal was added to each diversity subgroup for this safety injection interlock function, based on the reactor coolant mean temperature value T. avg Below the temperature threshold T aThe signal is ANDed with the above-mentioned safety injection function switch to generate the first indication signal after being unblocked. The indication signals from the two diversity subgroups are then ORed before being sent to the operator workstation. This ensures that the indication signal on the operator workstation will only disappear after the safety injection function of both diversity subgroups is blocked, thus accurately indicating the presence of the reactor coolant mean temperature T. avg Below the temperature threshold T a When the signal is received, the safety function switch in all of the above-mentioned diversity subgroups is not completely locked.

[0029] This solution also provides a signal indication system for interlocking safety injection protection, applied to the above method, including: a data acquisition module, a judgment module, and an indication module;

[0030] The acquisition module is used to acquire indication signals of diverse subgroups and safety injection protection interlock signals from the nuclear reactor protection system.

[0031] The determination module is used to determine the correct locking logic based on the indication signals and safety injection locking signals of each diversity subgroup.

[0032] The indicator module is used to display the signal of the correct interlocking logic determination result.

[0033] A further optimization is that the indicator module is an indicator light installed in the main control room.

[0034] A further optimized solution is that the acquisition module includes a first acquisition unit and a second acquisition unit;

[0035] In each diversity subgroup, the first acquisition unit is used to acquire the reactor coolant average temperature value T. avg Below the temperature threshold T a The second acquisition unit is used to acquire the safety protection lockout signal.

[0036] A further optimized solution is that the determination module includes: one OR gate and multiple AND gates;

[0037] Each diversity subgroup is matched with an AND gate, and the first and second acquisition units in the diversity subgroup are respectively connected to the two input terminals of the AND gate;

[0038] The outputs of all AND gates are connected to the inputs of the OR gates in a corresponding manner, and the outputs of the OR gates are connected to the indicator module.

[0039] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0040] The present invention provides a signal indication method and system for interlocking injection protection. An additional indication signal is collected for each diversity subgroup. The indication signal and the injection protection interlocking signal are jointly processed by the correct interlocking logic to generate a signal display result. By combining the indication signal and the injection protection interlocking signal with the correct interlocking logic to determine the on / off status of the injection function of the entire nuclear reactor protection system in a timely manner, the on / off status of the injection function of each diversity subgroup is determined and indicated. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] In the picture:

[0043] Figure 1 A schematic diagram of the signal indication method for interlocking safety injection protection;

[0044] Figure 2 This is a schematic diagram of the signal indication principle for the interlocking safety injection protection in Example 1;

[0045] Figure 3 This is a schematic diagram of the signal indication principle for the interlocking safety injection protection in Example 3. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0047] Example 1

[0048] This embodiment provides a signal indication method for interlocking safety injection protection, such as... Figure 2 As shown, the indicator light in the main control room will light up as soon as either diversity subgroup 1 or diversity subgroup 2 receives the safety injection function on / off lock signal; however, this design cannot accurately reflect whether both diversity subgroups are locked. If the power plant continues to implement power reduction operation when the diversity subgroups are not all locked, there is a risk of falsely triggering the safety injection.

[0049] Example 2

[0050] This embodiment provides a signal indication method for interlocking safety injection protection, such as... Figure 1 As shown, the steps include:

[0051] Obtain indication signals and safety injection protection interlock signals from the nuclear reactor protection system;

[0052] The correct interlocking logic is determined based on the indication signals and safety interlocking signals of each diverse subgroup.

[0053] The correct interlocking logic determination result is displayed as a signal.

[0054] The indication signal is the average temperature value T of the reactor coolant. avg Below the temperature threshold T a .

[0055] The method for obtaining the safety protection lockout signal is as follows:

[0056] Obtain the steam pipe pressure P and the average reactor coolant temperature T of the current diverse subgroup from the nuclear reactor protection system. avg and steam pipeline flow rate V;

[0057] Determine if the following conditions are met:

[0058] Scenario a: The steam pipeline pressure P is less than the pressure threshold P. a ;

[0059] Scenario b, reactor coolant average temperature T avg Below the temperature threshold T a ;

[0060] Case c: The steam pipeline flow rate V is greater than the flow rate threshold V. a ;

[0061] When conditions a and c are met simultaneously, or conditions b and c are met simultaneously, a safety protection lockout signal is obtained.

[0062] The correct interlocking logic determination includes the following process:

[0063] First, perform a blocking logic determination on each diversity subgroup to collect the first indication signal;

[0064] When any diversity subgroup receives the first indication signal, the signal display is executed.

[0065] The locking logic determination process includes:

[0066] When both the safety protection interlock signal and the indication signal are received simultaneously, the indication signal is obtained.

[0067] The diversity subgroup consists of two groups.

[0068] To address the problem in Example 1, specifically regarding the issue that "the steam pipeline pressure value P is less than the pressure threshold P," aOr the average temperature of the reactor coolant, T avg Below the temperature threshold T a "and the average temperature of the reactor coolant T" avg Below the temperature threshold T a "The protection function that triggers safety injection has been enhanced by adding an additional indicator signal to each diversity subgroup, based on the reactor coolant mean temperature value T." avg Below the temperature threshold T a This signal is generated by performing an AND operation with the aforementioned safety function switch not being locked. The indicator signals in the two subgroups are then sent to the operator workstation after an OR operation. In this way, the indicator signals on the operator workstation will only disappear after the safety functions of both multi-function subgroups are locked, thus accurately indicating the situation where the aforementioned safety function is not completely locked when the indicator signal is present.

[0069] Example 3

[0070] This embodiment provides a signal indication system for interlocking safety injection protection, applied to the method described in the previous embodiment, including: a data acquisition module, a judgment module, and an indication module;

[0071] The acquisition module is used to acquire indication signals of diverse subgroups and safety injection protection interlock signals from the nuclear reactor protection system.

[0072] The determination module is used to determine the correct locking logic based on the indication signals and safety injection locking signals of each diversity subgroup.

[0073] The indicator module is used to display the signal of the correct interlocking logic determination result.

[0074] The indicator module is an indicator light installed in the main control room.

[0075] The acquisition module includes a first acquisition unit and a second acquisition unit;

[0076] like Figure 3 As shown, in each diversity subgroup, the first acquisition unit is used to acquire the average reactor coolant temperature T. avg Below the temperature threshold T a The second acquisition unit is used to acquire the safety protection lockout signal.

[0077] The determination module includes: one OR gate and multiple AND gates;

[0078] Each diversity subgroup is matched with an AND gate, and the first and second acquisition units in the diversity subgroup are respectively connected to the two input terminals of the AND gate;

[0079] The outputs of all AND gates are connected to the inputs of the OR gates in a corresponding manner, and the outputs of the OR gates are connected to the indicator module.

[0080] When the interlocking safety injection function is being implemented, the original indicator signal design failed to accurately reflect whether both diversity subgroups were fully interlocked. Therefore, an additional indicator signal has been added to each diversity subgroup, which is the reactor coolant mean temperature value T. avg Below the temperature threshold T a This signal is generated by ANDing the indicator signal with the above-mentioned safety injection function switch not being locked. In this way, the indicator signal on the operator workstation will only disappear after the safety injection functions of both diversity subgroups are locked. This can accurately indicate whether the safety injection functions in the two subgroups have not been successfully locked, reducing the risk of system malfunction.

[0081] Those skilled in the art will understand that all or part of the steps in the above-described facts and methods can be implemented by a program instructing related hardware. The program, or the program described herein, can be stored in a computer-readable storage medium. When executed, the program includes the following steps: [The text then describes the corresponding method steps.] The storage medium can be ROM / RAM, magnetic disk, optical disk, etc.

[0082] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A signal indication method for interlocking safety injection protection, characterized in that, Including the following steps: Obtain indication signals and safety injection protection interlock signals from the nuclear reactor protection system; The correct interlocking logic is determined based on the indication signals and safety interlocking signals of each diverse subgroup. Display the signal indicating the correct interlocking logic determination result; The indication signal is the average temperature value T of the reactor coolant. avg Below the temperature threshold T a ; The method for obtaining the safety protection lockout signal is as follows: Obtain the steam pipe pressure P and the average reactor coolant temperature T of the current diverse subgroup from the nuclear reactor protection system. avg and steam pipeline flow rate V; Determine if the following conditions are met: Scenario a: The steam pipeline pressure P is less than the pressure threshold P. a ; Scenario b, average reactor coolant temperature T avg Below the temperature threshold T a ; Scenario c: The steam pipeline flow rate V is greater than the flow rate threshold V. a ; When conditions a and c are met simultaneously, or conditions b and c are met simultaneously, a safety protection lockout signal is obtained. The correct interlocking logic determination includes the following process: First, perform a blocking logic determination on each diversity subgroup to collect the first indication signal; When any diversity subgroup receives the first indication signal, the signal display is executed.

2. The signal indication method for interlocking safety injection protection according to claim 1, characterized in that, The locking logic determination process includes: When both the safety protection interlock signal and the indication signal are received simultaneously, the indication signal is obtained.

3. The signal indication method for interlocking safety injection protection according to claim 1, characterized in that, The diversity subgroup consists of two groups.

4. A signal indication system for interlocking safety injection protection, characterized in that, The method applied to any one of claims 1-3 includes: a data acquisition module, a judgment module, and an indication module; The acquisition module is used to acquire indication signals of diverse subgroups and safety injection protection interlock signals from the nuclear reactor protection system. The determination module is used to determine the correct locking logic based on the indication signals and safety injection locking signals of each diversity subgroup. The indicator module is used to display the signal of the correct interlocking logic determination result.

5. The signal indication system for interlocking safety protection according to claim 4, characterized in that, The indicator module is an indicator light installed in the main control room.

6. The signal indication system for interlocking safety protection according to claim 5, characterized in that, The acquisition module includes a first acquisition unit and a second acquisition unit; In each diversity subgroup, the first acquisition unit is used to acquire the reactor coolant average temperature value T. avg Below the temperature threshold T a The second acquisition unit is used to acquire the safety protection lockout signal.

7. The signal indication system for interlocking safety protection according to claim 6, characterized in that, The determination module includes: one OR gate and multiple AND gates; Each diversity subgroup is matched with an AND gate, and the first and second acquisition units in the diversity subgroup are respectively connected to the two input terminals of the AND gate; The outputs of all AND gates are connected to the inputs of the OR gates in a corresponding manner, and the outputs of the OR gates are connected to the indicator module.

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