Application of a system-based and a scenario-based risk analysis to the Driskos tunnel

Published: 12 April, 2010

Application of European Directive 2004/54/EC to road tunnels (over 500 m length on the trans-European road network) makes it necessary to perform risk analysis. Such risk analysis is also part of the safety documentation which is submitted to Administrative Authority for the operational approval of each tunnel. The Directive specifies a number of cases where risk analysis is required, and requires a Specific Hazard Investigation for all tunnels.
Scenario-based and system-based risk analyses are the two main methodologies of risk analysis used for road tunnels. For the Driskos tunnel, situated near Ioannina in Greece in Egnatia Odos motorway, both methodologies have been applied:
• A scenario-based method has been used for the Specific Hazard Investigation (which aims at studying all kinds of risks);
• A system-based risk analysis has been performed to support the decision about restrictions or not of the transport of Dangerous Goods (DG) in the Driskos tunnel.
The compared advantages and limitations of each type of methodology have been widely discussed. This paper focuses on, using the Driskos tunnel risk analyses as reference, relevance and limits of each type of methodology, taking into account the unavoidable uncertainties of the collected data and the risk analyses themselves.

File: 114-125_Application of a system-based risk analysis.pdf (3128k)

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