One of the major consequences of incidents in today’s industries, especially those associated with high quantities and a wide range of chemicals, is the widespread environmental degradation. Therefore, identifying the effective factors in the occurrence of incidents and analyzing the complex interrelationship between them is an important and fundamental topic in accident analysis and a way of preventing them from occurring. Materials and Methods: The present research was a descriptive-analytic study that aimed to analyze the environmental events occurring in the MAPNA group (Iran Power Plant Project Management). The main tool for the analysis of selected environmental incidents was the Tripod Beta technique, which identifies the causes of events at three levels of obvious causes, pre-conditions, and hidden causes. Results: In the current study, out of 96 analyzed accidents, 533 pre-conditions and 1,592 hidden causes were identified. Of all the hidden causes, the subject of repair and maintenance management had the highest frequency. In addition, among the identified hidden causes, the most important cause was inadequate specifications and equipment-related requirements. Conclusion: Emphasis on the amelioration of the hidden causes by taking into account the system lifecycle, focusing on the promotion of the safety levels in the design phase, as well as regarding the importance of adopting appropriate risk-based maintenance and repair strategies, were the main suggestions of the present study.
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