| Presentation | 2004/3/9 PFD of SRS with Redundant Subsystems Isamu TAKEDA, Tsuneharu SHIMODAIRA, Koichi SUYAMA, Yoshinobu SATO, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In accordance with an international safety standard, IEC 61508, it is required that a Safety Integrity Level (SIL) should be given to each safety function of Safety-Related Systems (SRS). The SIL is specified by the average Probability of Failure to perform the safety function on Demand (PFD) in the low demand mode of operation. Moreover, PFD can be improved by giving SRS with redundant subsystems, and SIL can be enhanced. In this paper, the PFD of SRS with redundant subsystems is formulated in consideration of the repair time at the proof test. The formulation provides us a practical and comprehensive approach to estimate PFD, where the failure and repair rates, and proof test intervals of SRS are taken into account. The result of formulation is compaired with those given by the standard. Then, significant difference is found out between them. It will be necessary to validate both approaches to estimating PFD. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | IEC 61508 / functional safety / safety-related system (SRS) / safety integrity level (SIL) / probability of failure on demand (PFD) / redundant system |
| Paper # | SSS2003-32 |
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| Conference Information | |
| Committee | SSS |
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| Conference Date | 2004/3/9(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Safety (SSS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | PFD of SRS with Redundant Subsystems |
| Sub Title (in English) | |
| Keyword(1) | IEC 61508 |
| Keyword(2) | functional safety |
| Keyword(3) | safety-related system (SRS) |
| Keyword(4) | safety integrity level (SIL) |
| Keyword(5) | probability of failure on demand (PFD) |
| Keyword(6) | redundant system |
| 1st Author's Name | Isamu TAKEDA |
| 1st Author's Affiliation | Tokyo University of Marine Science and Technology() |
| 2nd Author's Name | Tsuneharu SHIMODAIRA |
| 2nd Author's Affiliation | Tokyo University of Marine Science and Technology |
| 3rd Author's Name | Koichi SUYAMA |
| 3rd Author's Affiliation | Tokyo University of Marine Science and Technology |
| 4th Author's Name | Yoshinobu SATO |
| 4th Author's Affiliation | Tokyo University of Marine Science and Technology |
| Date | 2004/3/9 |
| Paper # | SSS2003-32 |
| Volume (vol) | vol.103 |
| Number (no) | 727 |
| Page | pp.pp.- |
| #Pages | 4 |
| Date of Issue | |