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Toward an Application Guide for Safety Integrity Level Allocation in Railway Systems

机译：走向铁路系统安全完整性等级分配的应用指南

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摘要

The work in the article presents the development of an application guide based on feedback and comments stemming from various railway actors on their practices of SIL allocation to railway safety-related functions. The initial generic methodology for SIL allocation has been updated to be applied to railway rolling stock safety-related functions in order to solve the SIL concept application issues. Various actors dealing with railway SIL allocation problems are the intended target of the methodology; its principles will be summarized in this article with a focus on modifications and precisions made in order to establish a practical guide for railway safety authorities. The methodology is based on the flowchart formalism used in CSM (common safety method) European regulation. It starts with the use of quantitative safety requirements, particularly tolerable hazard rates (THR). THR apportioning rules are applied. On the one hand, the rules are related to classical logical combinations of safety-related functions preventing hazard occurrence. On the other hand, to take into account technical conditions (last safety weak link, functional dependencies, technological complexity, etc.), specific rules implicitly used in existing practices are defined for readjusting some THR values. SIL allocation process based on apportioned and validated THR values is finally illustrated through the example of "emergency brake" subsystems. Some specific SIL allocation rules are also defined and illustrated.
机译：本文中的工作提出了一个应用指南的开发，该指南的依据是来自各个铁路参与者关于将SIL分配给铁路安全相关功能的实践的反馈和评论。 SIL分配的初始通用方法已更新，可应用于铁路机车车辆安全相关功能，以解决SIL概念应用问题。处理铁路SIL分配问题的各种参与者是该方法的预期目标。本文将总结其原理，重点是修改和精确度，以便为铁路安全机构建立实用指南。该方法基于CSM（通用安全方法）欧洲法规中使用的流程图形式。首先使用定量安全要求，特别是可容忍的危险率（THR）。将应用THR分配规则。一方面，规则与安全相关功能的经典逻辑组合相关，可防止发生危险。另一方面，考虑到技术条件（最后的安全薄弱环节，功能依赖性，技术复杂性等），定义了现有实践中隐含使用的特定规则以重新调整某些THR值。最后通过“紧急制动”子系统的示例说明了基于已分配和验证的THR值的SIL分配过程。还定义和说明了一些特定的SIL分配规则。

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