Application of a Hazard and Operability Study Method to Hazard Evaluation of a Chemical Unit of the Power Station

Background: the aim of this study was to identify the hazards, evaluate their risk factors and determinethe measure for promotion of the process and reduction of accidents in the chemical unit of thepower station.methods: in this case and qualitative study, hazop technique was used to recognize the hazards andproblems of operations on the chemical section at power station. totally, 126 deviations were documentedwith various causes and consequences.results: ranking and evaluation of identified risks indicate that the majority of deviations were categorizedas acceptable and less than half of that were unacceptable. the highest calculated risk level(1b) related to both the interruption of acid entry to the discharge pumps and an increased density ofthe acid. about 27% of the deviations had the lowest risk level (4b).conclusion: the identification of hazards by hazop indicates that it could, systemically, assess andcriticize the process of consumption or production of acid and alkali in the chemical unit of power plant.