<p>Rail and transit projects are increasingly referencing and requiring compliance with the CENELEC railway standards, and the Independent Safety Assessment (ISA) is a key element of the certification and homologation process. The Quantitative Risk Analysis (QRA) which includes the Safety Integrity Level (SIL) allocation to Safety Functions (SFs) is one of the major elements in the development of a Safety Management System (SMS) for the railroad and transit systems. This paper presents the experience with Safety Integirity Levels allocation to Safety functions&nbsp;designed on the Monorail Rolling Stock, which is essential for the Safety Management System&nbsp;to be successful in delivering IEC 61508 / CENELEC standards (EN 50126/8/9) based railroad and transit projects.</p><p>The paper firstly introduces&nbsp;the concept of Safety Integrity Level, interpretation of Safety Integrity Levels in the different standards such as IEC61508, EN50126, EN50128 and EN50129; methods of defining Tolerable Hazard Rate, ALARP principle, and experience of SIL allocation on the monorail rolling stock. The study of Safety Integrity Levels allocation on the monorail rolling stock mainly presents the following contents:&nbsp;&nbsp;charateristics of monorail system, general approach of SIL allocation, functional analysis, identification of required Safety Integrity Level, example discussion, assignment of safety functions to systems, and finally the&nbsp;identification of external risk reduction facilities. The conclusion is eventually summarized at the end of paper.&nbsp;</p>

Safety Integrity Level (Sil) Allocation on Monorail Rolling Stock

Paper Proceedings: https://asmedigitalcollection.asme.org/JRC/JRC2021/volume/84775

2021 Joint Rail Conference (JRC2021)

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