Home Analysis • Advanced Seminar on Common Cause Failure Analysis in by A. Amendola (auth.), Aniello Amendola (eds.)

Advanced Seminar on Common Cause Failure Analysis in by A. Amendola (auth.), Aniello Amendola (eds.)

By A. Amendola (auth.), Aniello Amendola (eds.)

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Read Online or Download Advanced Seminar on Common Cause Failure Analysis in Probabilistic Safety Assessment: Proceedings of the ISPRA Course held at the Joint Research Centre, Ispra, Italy, 16–19 November 1987 PDF

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Extra resources for Advanced Seminar on Common Cause Failure Analysis in Probabilistic Safety Assessment: Proceedings of the ISPRA Course held at the Joint Research Centre, Ispra, Italy, 16–19 November 1987

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38 - ~ 1 2 In the above scenario the XX might represents a human error in switching off a lubrication oil pump, component 1. Although the pump was not physically damaged, it could no longer provide its intended function and the resultant effect is that the turbine, component 2, physically failed due to lack of lubrication. A list of cause codes is given in Table VI. This does not significantly differ from other similar schemes. The proposed representation allows the analyst to distinguish in an incident sequence between: failure events (because of root-causes); failure events provoked by failures or unavailability of other components (cascade failures); unavailability events (functional unavailabilities) both component and root-caused induced; multiple failure/unavailability events; potentially failed components (incipient failures or exposure to causes that are known to have caused actual failures of similar components under similar circumstances).

In support of the study, data was obtained on events reported at nuclear plants and on airline accidents. This data was analysed to determine the types of common mode failure to which systems employing redundancy in design, were susceptible. From this analysis arose a general definition of the term 'Common mode failure'. The types of events which were identified as CMF's leading to a system failing to perform its intended function were:i the coincidence of failures of two or more identical components in separate channels of a redundancy system, due to a common cause, ii the coincidence of failures of two or more different components in separate channels of a redundancy system due to a common cause, iii the failure of one or more components which result in the coincidence of failures of one or more other components not necessarily of the same type, as the consequence of some single initial cause, iv the failure of some single component or service which is common to all channels in an otherwise redundant system.

Ii~ " '" i :l ... 0 n SRFU+PX ditto figu .... 27 ~ RPX i .. " Ii ~ PX r IE n I I r ~I Xl n PX r 2 n r Figure 1 - ~ 1 20 ~ ~ 2 I 2 r ~ [8J n n m! 1 S r ! 1 Pl r SRUU+Pl ditto figu .... 28 CPX ([8J~1 lSI xx : ~I r J: 1 19 r (~ij: ~~ij (~ ~ '~' Pl r n ~ 2 2 r ~ 1 ~ ;§ ! ~: ~n ~n nIl r.? 1 ;!. +' CF+PX RU+PX PX r PX r 33 r1 I 34 The universe of cause-effect component unavailabilities unit. - 40 - TABLE VI - Cause codes. n Actions. Plant Staff @ 8 Failure to Follow Procedures Misdiagnosis (Followed wrong procedure) Accidental Action Other (Explain) Maintenance Scheduled Preventive Maintenance (including Surveillance Tests and Calibration) Forced Maintenance (Repair of a Known Failure) Environmental Stress CD CD @ Electromagnetic Interierence @ ~ (spray.

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