Digital Safety in Railway Transport—Aspects of Management and Technology by Adam Jabłoński & Marek Jabłoński

Author:Adam Jabłoński & Marek Jabłoński
Language: eng
Format: epub
ISBN: 9783030961336
Publisher: Springer International Publishing

6.4 The Life Cycle of Railway Systems and the Digital Safety of Technical Systems

The life cycle of railway systems is a crucial determinant of the assessment, verification and validation of safety solutions. Any electronic and programmable solution must be considered in terms of the life cycle of the technical system. Each technical system is characterized by a certain service life and can generate different hazards during operation, which may result from both intrinsically relevant characteristics and parameters, as well as performance and functions. The life cycle of a digital system should be understood as a defined concept of the distribution over time of the activities taking place during the development, production and operation of a specific type of system. This cycle covers the period from the emergence of the user’s need to build a digital system, to the presentation of its ideas, construction, and use, adapted to possible changes in operation, and ending with its decommissioning. At each of these stages, the expected level of safety should be ensured through safety management activities. Within the life cycle of railway systems, which are designed to be safe, the concept of the overall safety life cycle must be isolated as a technical framework for the systematic treatment of activities required to ensure the functional safety of E/E/PE safety-related systems. To this end, it is reasonable to apply the provisions of the EN 61508-1:2010 standard. The overall safety life cycle includes the following measures to achieve tolerable risks, namely E/E/PE safety-related systems and other risk mitigation measures. The overall safety life cycle includes several crucial stages, namely the life cycle of the digital system at the implementation stage, the life cycle of the software at the implementation stage, the relationship between the overall safety life cycle and the safety life cycles of E/E/PE and software. The stages of the safety life cycle should include issues that are sequentially implemented in the project, such as the complete definition of the scope of analysis, hazards and risks, total safety requirements, the allocation of total safety requirements, complete operational and maintenance planning, complete safety validation planning, complete installation and commissioning planning, specification of E/E/PE safety requirements, the implementation of E/E/PE safety-related systems, other risk mitigation measures such as specification and implementation, complete installation and commissioning, complete safety validation, total operation, maintenance and repair, complete modification and renewal (EN 61508-1:2010). The digital safety of technical systems will be safe if all the above stages of the safety assessment for the different stages of the technical system life cycle are conducted and documented correctly. The correct implementation of the life cycle stages of railway systems in terms of safety means the reliability of inspections conducted, their verifiable verification, the documentation of full identification and identifiability of events, management supervision, compliance with relevant procedures, as well as responding to incompatibility and proactively seeking compatibility of railway systems through the use of methods of the monitoring and audits of safety systems. It will also be important to assess technical compatibility and safe integration in the case of changes in railway systems during their life cycle.

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