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SIL verification for SRS with diverse redundancy based on system degradation using reliability block diagram

机译：使用可靠性框图根据系统降级对具有各种冗余的SRS进行SIL验证

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摘要

Safety integrity level (SIL) verification is a critical step in safety lifecycle of safety-related systems (SRS). Introducing redundancy into SRS raises two issues: voting group configuration and common cause failures (CCF). In order to minimize CCF, diverse redundancy is widely adopted by SRS. However, in the past, almost all attention of SIL verification has been paid to identical redundancy, this is reflected in IEC 61508, ISA-TR84.00.02 and scientific literatures. Therefore, a novel method for SIL verification of SRS with diverse redundancy based on system degradation is proposed. Key idea of the method is to calculate average probability of dangerous failure on demand (PFDG) at each stage of system degradation, which is caused by failures of redundant channels. To validate proposed method, it has been applied on safety shutdown system of Nuclear Power Control Test Facility, and numerical result is compared with FTA and FRANTIC model. Sensitivity studies and comparison of numerical results indicate that the method has very good consistency with FTA and FRANTIC model. Moreover, two sets of general formulae for PFDG of any MooN(D) group with diverse redundancy are provided. From engineering practice point of view, it makes SIL verification process simpler.
机译：安全完整性等级（SIL）验证是安全相关系统（SRS）安全生命周期中的关键步骤。将冗余引入SRS会引发两个问题：投票组配置和共因故障（CCF）。为了最小化CCF，SRS广泛采用了多种冗余。但是，过去，几乎所有SIL验证的注意力都集中在相同的冗余上，这反映在IEC 61508，ISA-TR84.00.02和科学文献中。因此，提出了一种基于系统降级的具有多种冗余的SRS SIL验证的新方法。该方法的关键思想是在系统退化的每个阶段计算由冗余通道故障引起的按需危险故障的平均概率（PFDG）。为了验证该方法的有效性，将其应用于核电控制试验设施的安全关机系统中，并将数值结果与FTA和FRANTIC模型进行了比较。敏感性研究和数值结果比较表明，该方法与FTA和FRANTIC模型具有很好的一致性。此外，提供了两组具有不同冗余度的任何MooN（D）基团的PFDG的通用公式。从工程实践的角度来看，它使SIL验证过程更加简单。

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  • 来源
    《Reliability Engineering & System Safety》 |2017年第9期|170-187|共18页
  • 作者

    Ding Long; Wang Hong; Jiang Jin; Xu Aidong;

  • 作者单位

    Univ Chinese Acad Sci, Shenyang Inst Automat, Chinese Acad Sci, Key Lab Networked Control Syst, 114 Nanta St, Shenyang 110016, Peoples R China|Western Univ, Dept Elect & Comp Engn, 1151 Richmond St North, London, ON N6A 5B9, Canada;

    Univ Chinese Acad Sci, Shenyang Inst Automat, Chinese Acad Sci, Key Lab Networked Control Syst, 114 Nanta St, Shenyang 110016, Peoples R China;

    Western Univ, Dept Elect & Comp Engn, 1151 Richmond St North, London, ON N6A 5B9, Canada;

    Univ Chinese Acad Sci, Shenyang Inst Automat, Chinese Acad Sci, Key Lab Networked Control Syst, 114 Nanta St, Shenyang 110016, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Functional safety; SIL verification; Diverse redundancy; System degradation; MooN(D) voting group; RBD;

    机译：功能安全性;SIL验证;多样化;系统退化;MooN（D）投票组;RBD;

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