Procedure for assessing hardware safety integrity in legacy systems |
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| Institution: | 1. Department of Industrial Engineering, Ajou University, 206 World Cup-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Republic of Korea;2. IT Safety Engineering Center, Korea Testing Laboratory, 199 Techno 2-ro, Yuseong-gu, Daejeon, Republic of Korea;1. Department of Chemical & Environmental Engineering/Centre of Excellence for Green Technologies, University of Nottingham, 43500 Semenyih, Selangor, Malaysia;2. Chemical Engineering Department/Center for Engineering and Sustainable Development Research, De La Salle University, 2401 Taft Avenue, 0922 Manila, Philippines;3. Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan, ROC |
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| Abstract: | Functional safety is related to the safety functions of a safety-related system that uses electrical/electronic/programmable (E/E/PE) devices such as sensors, logic solvers, and final elements. A legacy system is a safety-related system which offers safety functions but which was not designed to comply with the IEC 61508 standard. This paper presents a procedure for assessing the hardware safety integrity of a legacy system so as to confirm its functional safety. The procedure defines the systematic relationship between the safety function and hardware system using a function-structure map (FSM) and assesses the hardware safety integrity centered on the safety function. The proposed procedure is applied to a boiler control system of a fossil-fuel power plant. |
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| Keywords: | Hardware safety integrity Legacy system Safety integrity level Boiler control system IEC 61508 |
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