Volume 5, Issue 1 (4-2015)                   JHSW 2015, 5(1): 13-24 | Back to browse issues page

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Karami E, Goodarzi Z, Hosseinzadeh T, Shirali G. Analyzing Hazards using System Theoretic process analysis (STPA) Methodology: A Case Study In The emergency extinguishing systems of Thermal power plant. JHSW. 2015; 5 (1) :13-24
URL: http://jhsw.tums.ac.ir/article-1-5239-en.html
1- M.sc., Department of Occupational Health Engineering, School of Public Health, University of Medical Sciences, Semnan, Iran
2- M.sc., School of Public Health, Jundishapur University of Medical Sciences, Ahvaz, Iran
3- Assistant Professor, Department of Occupational Health Engineering, School of Public Health, Jundishapur University of Medical Sciences, Ahvaz, Iran , shirali@ajums.ac.ir
Abstract:   (8119 Views)

Introduction: The weaknesses of traditional hazard analysis methods lead to their inefficiency to utilization for modern socio-technical systems. System Theoretic Process Analysis (STPA), which is in the category of systematic analysis methods, has a powerful logic to identify hazards in such systems,as a suitable alternative method. This study aimed to analyze hazards associated with extinguishing systems of steam unit of a power plant, using STPA method.


Material and Method: The present research is a qualitative case study. The related hazards were defined using STPA method.Following, the safety control structure diagrams in different parts were plotted and inadequate control measures and its causal factors were identified.


Result: For steam unit of power plant, the most tragic incidents wererelated to hazards and risks of turbine device (switch the turbine cycle). Then, according to the plotted diagram for structure of safety control extinguishing systems associated with switching the turbine cycle, PLC system was determined as the most important part of the control system and operator was identified as the strategic and effective part of a control system. Following, more than 54 causal factors were identified, considering the relevant details about the risks analysis of the turbine.


Conclusion: Due to its systematic structure,STPA method can be effective for a more complete identification of risks and causal factors which causing hazards in the emergency extinguishing systems. Therefore, development of such tools for those operators involved in safety-critical systems will be useful in terms of safety.

Full-Text [PDF 1398 kb]   (6359 Downloads)    
Type of Study: Research | Subject: Special
Received: 2015/03/18 | Accepted: 2015/03/18 | Published: 2015/03/18

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