MATEC Web Conf.
Volume 314, 2020International Cross-Industry Safety Conference (ICSC) – International Symposium on Aircraft Technology, MRO and Operations (ISATECH) (ICSC-ISATECH 2019)
|Number of page(s)||10|
|Section||International Cross-Industry Safety Conference|
|Published online||29 May 2020|
A novel real-time safety level calculation approach based on STPA
Undergraduate Student (Democritus University of Thrace, Civil Engineering, Greece)
2 Assistant Professor (Democritus University of Thrace, Civil Engineering, Greece)
3 Professor (Democritus University of Thrace, Civil Engineering, Greece)
* Corresponding author: firstname.lastname@example.org
This paper proposes a novel approach to dynamic safety level calculation for safety-critical systems based on the STAMP accident model and the implementation of a mathematical model. The proposed approach utilises (1) an STPA hazard analysis applied to the system in question, (2) system operational data from domain experts regarding process duration and reaction times, and (3) real-time system data. The STPA analysis is transformed into acyclic diagrams that graphically indicate every possible sequence of safety constraint violations that could lead to a loss (path). Based on this diagram the safety level (SL) of a system is defined as where is the most detrimental to safety path which is active for any possible time value or context in the system’s operation. This approach is also demonstrated using as a case study the “classical” Train Door STPA analysis example. This paper aims to introduce a new perspective on the problem of measuring and managing the actual safety level of highly complex socio-technical systems in real time and discusses related limitations and future research opportunities of this approach.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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