MATEC Web Conf.
Volume 273, 2019International Cross-industry Safety Conference (ICSC) - European STAMP Workshop & Conference (ESWC) (ICSC-ESWC 2018)
|Number of page(s)||10|
|Section||European STAMP Workshop & Conference|
|Published online||22 February 2019|
Nonlinear Degradation of System Configuration During the Development of an Accident
WSP UK, London, United Kingdom
2 Imperial College London, United Kingdom
3 Amsterdam University of Applied Sciences, The Netherlands
* Corresponding author: +44(0)7490276975, firstname.lastname@example.org
This paper utilises a methodology named “Risk SituatiOn Awareness Provision” (RiskSOAP). RiskSOAP expresses the capability of a system to meet its safety objectives by controlling its processes and communicating threats and vulnerabilities to increase the situation awareness of its end-users and support their decision-making. In reality safety-related system features might be partially available or unavailable due to design incompleteness or malfunctions. Therefore, respectively, the availability and capability of RiskSOAP mechanisms might fluctuate over time. To examine whether changes in RiskSOAP values correspond to a system degradation, we used the results of a previous study that applied the RiskSOAP methodology to the Überlingen mid-air collision accident. Complementary to the previous application where the RiskSOAP was calculated for four milestones of the specific event, in this study we divided the accident further into seventeen time-points and we calculated the RiskSOAP indicator per time-point. The results confirmed that the degradation of the RiskSOAP capability coincided with the milestones that were closer to the mid-air collision, while the plotting of the RiskSOAP indicator against time showed its nonlinear fluctuation alongside the accident development.
Key words: Safety / STAMP / STPA / EWaSAP / RiskSOAP
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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