Risk—from concept to decision making

Hafver, Andreas; Lindberg, David Volent; Jakopanec, I.; Pedersen, Frank Børre; Flage, Roger; Aven, Terje

doi:10.1201/b19094-105

Cited by 1 publication

(1 citation statement)

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“…Traditional approaches applied in safety and reliability engineering are predominantly risk-based. There are several ways to define the concept of risk, but usually it is defined as a combination of the severity and probability of an undesired event [Aven 2010;Hafver et al 2017]. Due to the issues in a solely risk-based approach, arguments have been presented against the use of traditional safety analysis methods, which often focus on analysis of component failures or linear chains of events, rather than identifying problems arising from unsafe interactions between system elements [Leveson 2012].…”

Section: Approaches To Hazard Identificationmentioning

confidence: 99%

Hazard Analysis of an Autonomous Container Handling System – a Comparison of STPA and HAZOP Methods

Heikkilä¹,

Malm²,

Sarsama³

et al. 2023

SJGMU

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Increasing automation is a major trend in container terminals. In automated container handling systems, safety has been previously ensured by segregating the automated machinery from other traffic and workers moving on foot. Currently, further increases in flexibility are sought by developing autonomous systems that are capable of mixed-traffic operations without the need for separate operating areas. This increases the complexity of the systems and introduces new safety hazards. In addition to traditional hazard analysis methods, new approaches are needed to address the emergent risks related to autonomous operations. This paper studies the applicability of the STPA (system-theoretic process analysis) method in hazard analysis of an autonomous machine system. To support the evaluation, we define evaluation categories for comparison of the analysis methods. We also compare STPA with an established method, HAZOP (hazard and operability study). To perform the comparison, both STPA and HAZOP are applied to an autonomous container handling system concept. The study suggests that both STPA and HAZOP are well suited to support the development of autonomous machinery. However, we also highlight some notable differences in the methods, mostly related to the different underlying accident models that they utilise. HAZOP is an established method with tools and standards available. STPA, on the other hand, provides a well-defined syntax to ensure the analysis quality and a system modelling approach that supports the system development.

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Section: Approaches To Hazard Identificationmentioning

confidence: 99%