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Paper Abstract and Keywords
Presentation 2013-09-26 10:30
Mean fault time for estimation of average probability of failure on demand PFDavg
Isshi Koyata, Koichi Suyama (kaiyodai), Yoshinobu Sato (JACO) SSS2013-14
Abstract (in Japanese) (See Japanese page) 
(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, PFDavg. In this paper, we firstly formulate the PFD_avg 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 1-out-of-n redundant systems. The mean fault time is useful for the exact estimation of safety integrity using Markov-state transition diagrams.
Keyword (in Japanese) (See Japanese page) 
(in English) Functional safety standard / Safety integrity / Low demand mode of operation / PFDavg / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 226, SSS2013-14, pp. 1-4, Sept. 2013.
Paper # SSS2013-14 
Date of Issue 2013-09-19 (SSS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SSS  
Conference Date 2013-09-26 - 2013-09-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SSS 
Conference Code 2013-09-SSS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
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  
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1st Author's Name Isshi Koyata  
1st Author's Affiliation The University of Marine Science and Technology Doctoral Course (kaiyodai)
2nd Author's Name Koichi Suyama  
2nd Author's Affiliation The University of Marine Science and Technology Doctoral Course (kaiyodai)
3rd Author's Name Yoshinobu Sato  
3rd Author's Affiliation Japan Audit and Certification Organization for Environment and Quality (JACO)
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Speaker Author-1 
Date Time 2013-09-26 10:30:00 
Presentation Time 40 minutes 
Registration for SSS 
Paper # SSS2013-14 
Volume (vol) vol.113 
Number (no) no.226 
Page pp.1-4 
#Pages 4 
Date of Issue 2013-09-19 (SSS) 

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