Advances in safety related maintenance

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12. In Fig. 14 the failed state probability is compared for the 2 cases (a) and (b). The difference between the failed state probabilities is not so obvious compared to the degraded and the operational state probabilities shown in Fig. 12 and Fig. 13. The rather small influence on the failed state probability is an indirect benefit obtained by the possibility of detecting degradation through tests, thus decreasing the probability of the pump transiting from a degraded state to the failed state.

In addition to preventive maintenance outages, the "real" availability also takes into account outages due to failures The rapid decrease of the availability reflects the high pump failure rate. 6 05 3 6 9 12 15 Preventive maintenance interval [weeks] Fig. 4. Availability of the auxiliary feedwater pump (turbine). The maximum availability considers only outages due to preventive maintenance activities. In addition to preventive maintenance outages, the availability also takes into account outages due to failures.

13. The rather small influence on the failed state probability is an indirect benefit obtained by the possibility of detecting degradation through tests, thus decreasing the probability of the pump transiting from a degraded state to the failed state. 15 0,10 0,05 0,00 i 12 16 20 maintenance interval [weeks] Fig. 14. Comparison of the failed state probability of the auxiliary feedwater pump of plant I: In case (a), tests are capable of detecting a degraded state with a probability of 25%, whereas in case (b) tests are not capable of detecting any mode of degradation.

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