Integrating Functional Block Diagrams and Systems-Theoretic Process Analysis: A Case Study of a Nuclear Power Station
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Date
2024-04-26
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International Journal of Safety and Security Engineering.Vol. 14, No. 2. pp. 359-372
Abstract
Hazard analysis and risk assessment are critical for ensuring safety and reliability in
complex systems. This article presents a combined approach to hazard analysis and risk
assessment using Functional Block Diagrams (FBD) and Systems-Theoretic Process
Analysis (STPA) methods. The FBD method is a versatile and intuitive diagrammatic
technique used to describe the functions and interrelationships of complex systems. It
represents the system as a set of interconnected blocks, each depicting a specific function,
which collectively defines the system's behaviour. On the other hand, STPA is an
advanced safety analysis method focusing on control structures and the interaction
between components. It identifies potential unsafe control actions by analysing the
information flow and the system's feedback mechanisms. The two methods are
complementary and can be integrated to provide a more effective and efficient approach
to hazard analysis and risk assessment. A case study of a nuclear power plant is used to
demonstrate the benefits of the combined approach. Practical considerations for
implementing the approach are discussed and compared with other hazard analysis and
risk assessment methods. The article concludes with suggestions for future research and
development in this area, highlighting the potential impact of the combined FBD-STPA
approach for improving safety and reliability in complex systems