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Additional info for Managing Aging in Nuclear Powerplants
_;ity Assurance - ISEG - Root Cause Analysis I Records Maintenance - Corrective Action - Retrievable - Failure Cause IIII _ I/1 rll the Effects of Aging Detect&Mitigate "_ Improved Monitoring Replace or Redesign - Increased PM _ o or,o,,OOl 1 | Procedures - Compare to Industry - Communicate to Mgt. - Establish Alert Levels .... 1. Trending uled more effectively on the basis of performance functional indicators and failure trends, program or mined whether the utility established and implemented maintenance performance indicators.
In the case of PRA, the actual or proposed system unavailability due to maintenance is used to assess a component's relative importance with respect to the core damage frequency or risk of offsite consequences. Downtime of the component, corrective maintenance frequency, or trending of certain operating parameters are used in the model to predict a component's failure rate and its effect on system reliability, plant outage time, core damage frequency and risk of offsite consequences. Other Plant Records Trends of component or system failures are determined using either individual plant maintenance records or national databases which contain several different plants' records on the subject.
Described in the previous section are not all inclusive, it is useful to compare the deficiencies to the NRC's findings cited by Gody et al. 5 Specifically, for the plants which were cited as having poor technical and engineering support of maintenance and also poor maintenance trending, the following reasons related to root-cause analysis were noted: • ii Repetitive failures of equipment were not identifled as a basis for changes in the scope of the preventive maintenance program. • Inadequate root cause analyses were performed when equipment failed.