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Based on the degradation mode, a component degradation may or may not be detected. In order to include the possibility of detecting component degradation through tests, we will introduce degradation detection probabilities through tests. Thus it is possible to correct a degraded state through tests, bringing the component back to the operational state. For the auxiliary feedwater pump (diesel) of plant I, we compared 2 different cases: • 25% degradation detection probability through test • 50% degradation detection probability through test 25% Degradation Detection Probability Through Tests In Fig.

This activity includes the evaluation of the scope maintenance works and criteria applied. Results trend to evaluate component performance and aging effects are analyzed. • Definition and implementation of performance indicators. • Design modifications and backfitting assessment. • Assembly procedures assessment. • Commissioning procedures assessment. • Regulatory requirements. 3. MAINTENANCE ACTIVITIES PERFORMED BY UTILITIES The NPP's maintenance program is fundamentally based on manufacturer recommendations, operating experience, safety analysis and engineering judgment.

10 the operational state is compared for the 3 different test intervals at a preventive maintenance interval of 12 weeks. It can be seen that the operational state probability decreases with the extension of the test interval. Operational State Probability 0,650 _ (1) test every 3 weeks 0,625 (2) test every 4 weeks 0,600 - (3) test every 6 weeks 0,575 , 0,550 0,525 1 2 3 Preventive Maintenance Interval = 12 Weeks Fig. 10. Compares the operational state probability of the auxiliary feedwater pump of Plant I for 3 different test intervals It can be seen that with the extension of the test interval, the operational state probability increases, caused by the increase of the failed state probability.

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