Fire risk assessment in Tehran metro line 1 (rectifier substation) with fault tree analysis

Subway system including infrastructure systems in the transportation industry that is potentially exposed to fire, flood, earthquake and similar events and could create catastrophic losses to society. Therefore, this study aims to assess the fire risk in Tehran subway stations (line 1). In performing this research, after the identifying the fire hazards resources in subway stations through observing, interviewing techniques and reviewing the documents, using fault tree analysis the causes of electrical fires in rectifier substations in line 1 of Tehran metro, was determined. Further more, with quantitative fault tree analysis, the probability of the fire risk was calculated per year. The findings indicate that, main causes of electrical fires in this post are including signs and devices, improper maintenance, improper implementation during equipment installation, inappropriate quality of equipment and their aging. The probability of an accident every 11 years was calculated. By holding training courses for personnel involved and careful monitoring during maintenance and installation of equipment, much lower probability risk would occur.