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. Safety in these projects is vulnerable position. Analysis of risk resources and its safety risk is one of the important activities to prioritize existing risks as well as managing them in the process of building a power plant as one of the most dangerous industries in terms of safety risks. The purpose of this study was to analyze the safety risks existing in the construction phase in a power plant based on the Bow-tie technique.

This is a cross-sectional analytical study that was carried out at house power of a combined cycle power plant in 2017. Safety analysis of risks in this study was performed based on the Bow-tie technique using the Bow Tie ProTM software. For the more effectiveness of this study, two phases of system descriptions and identifying risk sources have been designed and implemented before the risk analysis steps, and the identification of the path of each branch of the Bow-tie chart (consequence to event occurrence).

The results of analysis of the relationship between the elements of each activity and its threats and its consequences showed that the highest level of threats has related to pressured cylinders, welding and cutting (8 threats including mechanical damage, heat, transportation, unsafe connections, cylinders storage, oil and grease, leakage and flame retardation); the most significant consequences have related to heavy loading (3 consequences including human injury, damage to cranes and damage to facilities and equipment), and pressured cylinders, welding and cutting (3 consequences of human injury, fire and explosion and damage to facilities and equipment).

The findings of the study indicated that the use of Bow Tie ProTM software is a suitable method for analyzing the safety risks of large projects such as the construction of a power plant that can lead to provide preventive and limiting safety measures in order to prevent and reduce threats as well as to control the safety implications of construction activities.