Grace Period.

DOE-STD-1052-93

2. 6

Grace Period. A time period after the scheduled completion date in which the

activity may be completed without being considered overdue. This time period is

normally 25 percent of the scheduled interval.

2. 7

Maintenance. Day-to-day work that is required to maintain and preserve plant and

capital equipment in a condition suitable for its designated purpose and includes

preventive, predictive, and corrective (repair) maintenance.

2. 8

Maintenance Importance Generator. A computerized system using predetermined

rules to compare data on an MJR and to establish relative-importance ranking for

each maintenance job.

2.9

Master Equipment List. A detailed master list of equipment, components, and

structures to be included in the maintenance program. This list includes both safety

related and non-safety related systems and equipment.

Outage. Condition existing whenever production has stopped.

2.10

2.11

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.

Planned Maintenance. Preventive maintenance activities performed prior to SSC

2.12

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.

Predictive Maintenance. Predictive maintenance activities involve continuous or

2.13

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 can be monitored; therefore, predictive

maintenance should be selectively applied. Reliable predictive maintenance is

normally preferable to periodic internal inspection or equipment overhauls.