Point-to-Point Protocol Self-Diagnosis for Nuclear I&C Errors
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Solution Overview
Problem
Existing self-diagnosis methods for nuclear plant safety instrumentation and control systems are inadequate for point-to-point communication protocols, failing to provide full coverage of network errors and risking system stability and safety due to potential misuse of erroneous data.
Innovation Solution
A self-diagnosis method for point-to-point communication protocols in nuclear plant safety instrumentation and control systems that accurately determines network communication errors, sets a reasonable frequency tolerance threshold, and ensures immediate reporting of faults, minimizing determination mistakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing self-diagnosis methods are used for point-to-point communication protocols, then the system structure remains simple, but the coverage of network errors is incomplete and system safety is compromised
Solution Approach 1:
The diagnosis function is segmented into eight independent diagnosis modules, each responsible for detecting a specific type of network error (data crash, accidental retransmission, erroneous sequence, loss, delay timeout, invalid insertion, camouflage messages, and erroneous addressing). This segmentation allows comprehensive coverage of all possible error types while keeping each individual module relatively simple and manageable.
Solution Approach 2:
The system performs self-diagnosis by automatically detecting and identifying network errors without requiring external intervention. The diagnosis function continuously monitors communication parameters and autonomously determines when errors occur, reporting them to the control unit for appropriate response. This self-service capability ensures continuous safety monitoring while reducing operational complexity.
2Reliability
If comprehensive error diagnosis is implemented, then system safety is improved, but the complexity of the communication protocol increases
Solution Approach 1:
The comprehensive error diagnosis is achieved through segmentation into eight specialized diagnosis modules, each handling a specific error type. This approach allows the system to maintain comprehensive safety coverage while keeping each diagnostic function focused and manageable, rather than implementing a single complex monolithic diagnosis system.
Solution Approach 2:
The protocol utilizes parameter changes in the data frame structure, specifically incorporating diagnostic fields that modify existing parameters to enable error detection. By changing parameters such as adding diagnostic fields to data frames and modifying error detection thresholds, the system achieves comprehensive error diagnosis without fundamentally redesigning the entire communication protocol.
3Loss of time
If real-time error detection is implemented, then response time is reduced, but the processing burden on the system increases
Solution Approach 1:
The processing burden is segmented across eight specialized diagnosis modules that operate in parallel, each handling a specific error type independently. This segmentation allows real-time error detection for multiple error types simultaneously without creating a single processing bottleneck, reducing overall processing burden while maintaining fast response times.
Solution Approach 2:
The diagnosis function operates using periodic action by continuously monitoring communication parameters at regular intervals rather than requiring constant intensive processing. This periodic monitoring approach enables real-time error detection while reducing the average processing burden compared to continuous intensive analysis, as the system only processes data when communication events occur.
Data Source
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AI summary
Provided is a self-diagnosis method for a communication protocol of a security-level instrumentation and control system of a nuclear power plant. The method is realized by means of the steps of, based on a point-to-point network protocol composed of an application layer, a data link layer and a physical layer, a sender acquiring a destination MAC, a source MAC and upper-layer data, and packaging and sending the acquired upper-layer data in a frame format; detecting a destination MAC and a source MAC of a data frame to diagnose an error address; determining a TICK and a message serial number of the data frame; using a CRC check code of the data frame to detect and diagnose a data corruption error; when the error is diagnosed to be time-out delay, performing fault diagnosis and fault recovery, etc. By means of the self-diagnosis method in the present invention, the diagnosis of eight types of network errors is fully covered, and it is ensured that erroneous data is not misused. A reasonable tolerance threshold value of the number of network diagnosis fault times is set, so that the stability of the system is ensured, and a determined network fault is reported at the first time, thereby effectively ensuring the point-to-point communication quality of a security-level instrumentation and control system of a nuclear power plant.