Title page for 953206015


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Student Number 953206015
Author Yu-Guang Ye(葉宇光)
Author's Email Address No Public.
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Department Graduate Institute of Environmental Engineering
Year 2008
Semester 1
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Application of Event Tree Analysis in Occupational Safety Risk Assessment
Date of Defense 2009-01-10
Page Count 107
Keyword
  • Event Tree Analysis
  • Layer of Protection Analysis
  • Occupational Health and Safety Management System
  • Risk Assessment
  • Abstract Hazard identification, risk assessment and risk control constitute the critical tasks of occupation health and safety management system standard OHSAS 18001. Risk assessment provides organizations with an in-depth understanding of occupational health and safety risks and are the basis for the design and implementation of risk control mechanisms. Among the available risk assessment techniques, risk matrix is most commonly used because of its simplicity. However, the usefulness applicability of risk matrix depends on appropriate estimation of frequency and consequence of an identified risk. It can become inconclusive or even misleading when inappropriate estimations of frequency and consequence are made. In this study, event tree analysis, ETA, is applied for accident type identification and frequency estimate.
    Event tree analysis is widely used for safety analysis and risk assessment as it is capable of specifying how a sequence of events, or scenario, develops under various conditions. The formalized scenarios can then be used to identify the accident characteristics and the likelihood of a specific scenario being fully developed. However, there is a lack of consideration for the functions protection layers and their effectiveness in event tree analysis. The so-called onion model is applied in this study to analyze sequence of the protection layers.
    Two different categories of risks are addressed in this study. The first case study focuses on the likelihood and consequence analyses for a bulk silane storage and supply system. Protection layers and safety integrity level of each layer are used to construct the branches of ETA. The bulk silane system is selected due to its wide applications in Taiwan’s high-tech industry and its extremely hazardous nature. Protection layers such as gas detector, UV/IR flame detector, sprinkler system, and
    various automatic shut-off mechanisms used in a solar cell module manufacturing facility are considered as the protection layers. The second case study attempts to use event tree to analyze possible scenarios of hazardous manual tasks. The administrative control in occupational safety and health management system is incorporated with the concept of protective layers. Results of the case studies confirm the applicability of the proposed risk assessment technique proposed in this study.
    Table of Content 摘要I
    AbstractII
    誌謝IV
    目錄V
    圖目錄VIII
    表目錄X
    第一章 前言1
    1.1 職安衛管理系統發展趨勢1
    1.2 研究目的4
    1.3 研究架構與流程4
    第二章 文獻回顧6
    2.1 名詞定義6
    2.2 風險評估與職安衛管理系統8
    2.3 風險評估技術概述12
    2.4 常用危害辨識與風險評估技術13
    2.4.1 查核表14
    2.4.2 What-If分析15
    2.4.3 失效模式與影響分析/失效模式影響與關鍵性分析16
    2.4.4 危害與可操作分析17
    2.4.5 失誤樹分析19
    2.4.6 事件樹分析20
    2.4.7 風險矩陣21
    第三章 風險評估機制建立27
    3.1 風險評估機制27
    3.2 評估步驟32
    3.2.1 風險矩陣及可容忍風險界定32
    3.2.2 辨識起始事件33
    3.2.3 防護層定義及排序原則35
    3.2.4 建構事件樹與事故情境38
    3.2.5 估計起始事件發生頻率及防護層失效率40
    3.2.6 計算後果發生頻率42
    3.2.7 決定事故後果風險等級43
    第四章 大宗矽甲烷供應系統事件樹應用45
    4.1 供應系統說明46
    4.2 風險矩陣及可容忍風險46
    4.3 分析範圍及起始事件48
    4.4 防護層界定48
    4.5 建立事件樹51
    4.5.1 起始事件情境一51
    4.5.2 起始事件情境二53
    4.5.3 起始事件情境三53
    4.6 起始事件發生頻率及防護層失效率58
    4.7 事故發生頻率及後果嚴重性61
    4.8 分析結果探討65
    4.9 風險控制66
    4.9.1 排氣抽風系統設置66
    4.9.2 提高安全儀器系統可靠度(SIL=1)72
    4.9.3 提高UV/IR安全儀器系統可靠度(SIL=2)76
    4.10 事件樹於職業災害應用78
    4.10.1 屋頂維修作業墜落致死災害79
    4.10.2 染色機作業捲入致死災害80
    4.10.3 機台調整作業被夾致死災害82
    第五章 結論與建議84
    5.1結論84
    5.2 建議86
    參考文獻90
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    Advisor
  • Shuh-Woei YU(于樹偉)
  • Files
  • 953206015.pdf
  • approve immediately
    Date of Submission 2009-02-04

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