Application of Fault Tree Analysis in Fault Diagnosis of Detectors in Nuclear Power Plant

The degradation or failure of equipment can affect nuclear safety or unit availability in Nuclear Power Plant, thus the analysis of failure causes becomes even more important. Fault Tree Analysis (FTA) is a commonly used and effective method for analyzing the causes of complex systems in Nuclear Power Plant. It shows how equipment fails in a graphical manner, diagnoses the causes of failures, fundamentally eliminates defects, and improves the reliability of equipment. This article introduces the application of FTA in Nuclear Power Plant, analyzes the causes of Nuclear Instrumentation System (RPN) detector failures using a combination of FTA and troubleshooting methods, analyzes the causes of cabinet area equipment failures, measurement channel failures, and cable area failures, investigates external interference factors, identifies the root causes of RPN detector failures and develops targeted corrective actions to prevent recurrence of events. Thus, the safety performance of nuclear power units is improved.