Planned Maintenance

DOE-STD-1053-93

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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.

Predictive Maintenance. Predictive maintenance activities involve continuous or

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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.

Preventive Maintenance. Preventive maintenance includes periodic and planned

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maintenance actions taken to maintain SSC within their design operating conditions,

extend its life, and is performed to prevent SSC failure. This includes technical safety

requirements surveillances, in-service inspections, and other regulatory forms of

preventive maintenance.

Root Cause. A determination based on an analytical technic that determines the

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fundamental cause of failure.

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Structures, Systems and Components (SSC). Physical items designed, built, or installed

to support the operation of the plant.

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Technical Support. The engineering, design, specialized inspections, planning, or other

such support of capital asset maintenance and repair.

Work Control Document. Proceduralized document used by facility personnel to

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perform inspections, testing or work.