Evaluation of Effectiveness of Fault-Tolerant Techniques in a Digital Instrumentation and Control System with a Fault Injection Experiment

다국어 초록 (Multilingual Abstract)

Recently, instrumentation and control (I&C) systems in nuclear power plants have undergone digitalization.
Owing to the unique characteristics of digital I&C systems, the reliability analysis of digital systemshas become an important element of probabilistic safety assessment (PSA). In a reliability analysisof digital systems, fault-tolerant techniques and their effectiveness must be considered. A fault injectionexperiment was performed on a safety-critical digital I&C system developed for nuclear power plants toevaluate the effectiveness of fault-tolerant techniques implemented in the target system. A softwareimplementedfault injection in which faults were injected into the memory area was used based onthe assumption that all faults in the target system will be reflected in the faults in the memory. To reducethe number of required fault injection experiments, the memory assigned to the target software wasanalyzed. In addition, to observe the effect of the fault detection coverage of fault-tolerant techniques, aPSA model was developed. The analysis of the experimental result also can be used to identify weakpoints of fault-tolerant techniques for capability improvement of fault-tolerant techniques

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