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DOE-STD-1050-93
(Examples of activities that may qualify as "minor maintenance" and those that do not
qualify are given in Appendix C. These are examples only and do not constitute a
definitive list.)
2.15 Outage. Condition existing whenever normal operations has stopped, due to planned
or unplanned occurrences.
2.16 Performance Test. A test of SSC to verify that required performance characteristics
may be achieved, to detect any abnormal performance characteristics, and to
determine the effect of maintenance and operating activities on equipment
performance.
2.17 Performance Monitoring. Systematic monitoring and trending of the performance of
selected plant SSC to measure and assess the impact of any performance changes on
overall plant efficiency, reliability, and availability.
2.18 Periodic Maintenance. Preventive maintenance activities accomplished on a routine
basis (typically based on operating hours or calendar time) and may include any
combination of external inspections, alignments or calibrations, internal inspections,
overhauls, and SSC replacements.
2.19 Planned Maintenance. Preventive maintenance activities performed prior to SSC failure
and may be initiated by predictive or periodic maintenance results, by vendor
recommendations, or by experience/lessons learned.  These include items such as
scheduled valve repacking, replacement of bearings as indicated from vibration analysis,
major or minor overhauls based on experience factors or vendor recommendations and
replacement of known life-span components. For example, repacking a valve due to
packing leakage would be corrective maintenance, but scheduled repacking prior to
leakage would be planned maintenance.
2.20 Postmaintenance Test. Any appropriate testing performed following maintenance to
verify that a particular piece of equipment or sy stem performs its intended function
based on its design criteria and that the original deficiency has been corrected and no
new deficiencies created.
2.21 Predictive Maintenance.  Predictive maintenance activities involve continuous or
periodic monitoring and diagnosis in order to forecast component degradation so that
"as-needed" planned maintenance may be performed prior to SSC failure. Not all SSC
conditions and failure modes may be monitored; therefore, predictive maintenance
should be selectively applied. Reliable predictive maintenance is normally preferable
to periodic internal inspection or equipment overhauls.
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