OPEN ACCESS
Proper hazard analysis and risk evaluation management are the main steps to define the safety requirements of a railway control command system aiming to protect trains from their physical constraints, the limits of the infrastructure they have to run on and the traffic constraints as they share the same infrastructure with other vehicles. After a short overview of the Italian national railway control command systems, the goal of this paper is to describe the approach adopted for providing the hazard analysis to the protection system named SSC (Supporting System for the Driver – Sistema di Supporto alla Condotta) with a special focus on the risk assessment phase where the quantitative evaluation of risk at system level was performed including human factor (particularly driver error). The applied methodology adheres to the European Commission Regulation 402/13 on the com- mon safety method for risk evaluation and assessment, and it is in line with the CENELEC standards EN50126 and EN50129 valid for safety-related electronic systems for railway signalling and commu- nication applications.
European Commission Regulation 402/13, quantitative risk evaluation, railway control command and signalling systems, risk acceptance.
[1] CENELEC European Standard EN50126, Railway applications – the specification and demonstration of Reliability, Availability, Maintainability and Safety (RAMS).
[2] CENELEC European Standard EN50129, Railway applications – communication, signalling and processing systems – safety related electronic system for signalling.
[3] CENELEC European Standard EN50128, Railway applications – communication, signalling and processing systems – software for railway control and protection systems.
[4] European Commission Implementing Regulation (EU), No 402/2013 of 30 April 2013.
[5] Italian Legislative Decree n° 162/2007 - art. 10 e 12.
[6] Hammerl, M. & Vanderhaegen, F., Human Factors in the Railway System Safety Analysis Process, 3rd International Rail Human Factors Conference.
[7] Kim, J., Jung, W., Jang, S.C. & Wang, J.B., Case study for the selection of a railway human reliability analysis method (issued by Korea Atomic research institute and Korea Railroad research institute).