Safety improvement using system theoretic process analysis STPA Case study: Reactor 950-155 at CP2K-Sonatrach Skikda
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Date
2025-11-10
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University of August 20, 1955, Skikda: Faculty of technology Department of petrochemical and process engineering
Abstract
Industrial safety is a crucial issue in high-risk fields like the petrochemical sector, where the
complexity and the combination of advanced control systems, software, and human elements
pose challenges to traditional risk assessment techniques. This thesis investigates the
shortcomings of standard methods such as HAZOP, FMEA, and QRA, which frequently do not
adequately address the dynamic interactions and systemic factors that lead to accidents in
contemporary industrial settings. To overcome these limitations, the research delves into the
use of System-Theoretic Process Analysis (STPA), a contemporary safety analysis approach
based on systems theory. Created by Professor Nancy Leveson, STPA views safety as a control
challenge rather than simply a matter of reliability. The thesis applies STPA to Reactor 950-
155 at CP2K-Sonatrach Skikda, following its four primary steps and utilizing ALOHA for
simulation purposes.