Presentation	2013-09-26 Mean fault time for estimation of average probability of failure on demand PFDavg Isshi KOYATA, Koichi SUYAMA, Yoshinobu SATO,
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Abstract(in English)	In functional safety standards, the safety integrity of safety-related systems operated in the low demand-mode of operation is defined as its average probability of dangerous failure on demand, PFD_. In this paper, we firstly formulate the PFD_ resulting from the undetected failures being maintained by proof tests from the 3-viewpoints of the mean fault time, the reliability, and the risk assessment of safety-related system. Based on the formulation, the mean fault time is derived using the proof test interval for l-out-of-n redundant systems. The mean fault time is useful for the exact estimation of safety integrity using Markov-state transition diagrams.
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Keyword(in English)	Functional safety standard / Safety integrity / Low demand mode of operation / PFDavg
Paper #	SSS2013-14
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Committee	SSS
Conference Date	2013/9/19(1days)
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Registration To	Safety (SSS)
Language	JPN
Title (in Japanese)	(See Japanese page)
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Title (in English)	Mean fault time for estimation of average probability of failure on demand PFDavg
Sub Title (in English)
Keyword(1)	Functional safety standard
Keyword(2)	Safety integrity
Keyword(3)	Low demand mode of operation
Keyword(4)	PFDavg
1st Author's Name	Isshi KOYATA
1st Author's Affiliation	The University of Marine Science and Technology Doctoral Course, Course of Applied Marine Environemntal Studies()
2nd Author's Name	Koichi SUYAMA
2nd Author's Affiliation	The University of Marine Science and Technology Doctoral Course
3rd Author's Name	Yoshinobu SATO
3rd Author's Affiliation	Japan Audit and Certification Organization for Environment and Quality
Date	2013-09-26
Paper #	SSS2013-14
Volume (vol)	vol.113
Number (no)	226
Page	pp.pp.-
#Pages	4
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