Scheduling of Predictive Maintenance

DOE-STD-1052-93

3.4.4.6

a) The interval that predictive maintenance tasks are performed may vary

depending on such factors as those listed in Section 3.4.3.2. In

addition, the relative importance of the equipment to overall plant

operations may be factored into determining an appropriate interval.

It should be recognized that predictive maintenance tasks should be

managed and scheduled as part of the overall plant preventive

maintenance program. Example priorities for taking action based on

predictive maintenance results are as follows:

1) Safety-related (Priority A): Designation of equipment whose failure

would compromise safety and/or impose limiting conditions for

operation (LCO).

2) Capacity Threatening - Not Spared (Priority B): Designation of

equipment whose failure would result in total or partial capacity

loss.

3) Capacity Threatening - Spared (Priority C): Designation of

equipment whose failure would result in partial or total loss of

capacity if backup equipment is unavailable or fails.

4) Support Equipment (Priority D): Designation of equipment whose

failure would result in eventual reduction of unit efficiency, safety,

5) High-maintenance Items (Priority E): Designation of equipment

that has a high incidence of failure.

b) A master schedule should be prepared based on the assigned interval

dictated by Section 3.4.3.3 and the priorities denoted in item "a" above.

c) Work control documents should be prepared for each predictive

maintenance task.

d) Grace periods should be specified in the predictive maintenance

program (normally 25 percent of the scheduled interval); however,

tasks should normally be performed as scheduled, and grace periods

should be used only when approved unavoidable conflicts arise.