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Mohammadfam I, Eskandari T. Bow-tie Risk Assessment of Hydrogen Gas Leakage From the Chlorination Unit of a Combined-cycle Power Plant. Disaster Prev. Manag. Know. 2025; 15 (2) :230-241
URL: http://dpmk.ir/article-1-731-en.html

Background and objective The combined-cycle power plants are one of the important types of power plants in the world with high occupational accidents. To reduce the costs for occupational accidents and reduce the lost days, finding the root causes of accidents in these industries is necessary. This study aims to assess the risk of hydrogen gas leakage from the chlorination unit of a combined-cycle power plant with once-through cooling system using the Bow-tie risk assessment method.
Method At first, the hydrogen gas leakage from the chlorination unit of a combined-cycle power plant in Iran was selected as the scenario for probabilistic risk assessment. For finding the causes and consequences of the scenario, the bow-tie method was used. 
Results We identified 44 basic events, three safety barriers that prevent the occurrence of the desired scenario (congestion, immediate ignition, and delayed ignition), and six consequences including flash fire, jet fire, fire ball, pool fire, explosion, and safe release of hydrogen gas. The probability of hydrogen leakage from the chlorination unit was 1.51×10-1%, and the most likely consequence was “explosion/jet fire/flash fire,” with a probability of 4.89×10-2%.
Conclusion We identified the causes, safety barriers, and potential consequences of hydrogen gas leakage from the chlorination unit of a combined-cycle power plant. The malfunction of electrolyzers is the most significant cause and explosion/jet fire/flash fire is the most important consequence of hydrogen leakage.