Analysis of Construction Safety Risk in House Power of a Power Plant Based on Bow-Tie Technique
Large construction projects are always at high risk, so the safety of these projects would be of utmost importance. Analysis of risk resources and safety risk is one of the important activities to prioritize the existing risks as well as managing them in the process of building a power plant as one of the most at-risk industries in terms of safety issues. The purpose of this study was to analyze the safety risks existing in the construction phase of a power plant based on the Bow-tie technique. This cross-sectional analytical study was carried out in 2017 at the house power of a combined cycle power plant. Safety analysis of the risks was performed based on the Bow-tie technique using the Bow Tie ProTM software. For the more effectiveness of this study, two phases, including system descriptions and identification of the risk sources were designed and implemented before the risk analysis steps, and prior to identifying the path of each branch of the Bow-tie chart (from consequence to event occurrence). The results showed that the highest level of threats is related to “pressure cylinders”, “welding”, and “cutting” (including 8 threats of mechanical damage, heat, transportation, unsafe connections, cylinders storage, oil and grease, leakage, and flame retardation). In addition, the most significant consequences were related to heavy loading (including 3 consequences of human injury, damage to cranes, and damage to facilities and equipment), pressure cylinders, welding, and cutting (including 3 consequences of human injury, fire and explosion, and damage to facilities and equipment). The findings indicated that Bow Tie ProTM software would be a suitable tool in analyzing the safety risks of large projects, such as the construction of power plants that involves considering preventive and limiting safety measures for prevention or mitigation of threats as well as controlling the safety implications of the construction activities.
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