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Toru KUKUNO
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Hideo NAKAMURA
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Yukimitsu SATO
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Kazuo KIMIZUKA
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Takashi IMAISHI
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Hiroki SUTO, Satoshi SHIGEMATSU, Takahiro HATANO, Chikara YAMAGUCHI, Y ...
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Hiroshi UJITA
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Noboru SUGIMOTO
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Naohiro YUHARA
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Hirotaka SHIMIZU, Tsuneharu SHIMODAIRA, Yoshinobu SATO
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2004 Volume 26 Issue 6 Pages
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In order to specify a safety integrity level (SIL), the IEC 61508 classifies the operation modes of safety-related systems (SRSs) into two categories, low demand mode of operation and high demand/continuous mode of operation. However, it is not clear which modes of operation should be applied to the seasonally-operated multi-layer SRSs. Then, the present paper investigates the relationships among failures of the SRSs composed of thermal control device, thermal protection device and thermal fuse, demand to operate the SRSs and the hazardous event, i.e., breaking out of fire, through both a-FTA and precise analysis. The seasonal operation is taken into account in the precise analysis only. The hazardous event frequencies obtained through the two analyses show a maximum difference of 15[%]. Finally SILs of the SRS are specified using the ratios of the hazardous event to demand frequencies. Thus, the paper establishes the procedure how to combine SILs of the seasonally-operated multi-layer SRSs with risk analyses of the overall system.
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