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DOE-STD-1052-93
8.1.3 Task Interval Determination
This section discusses considerations for establishing the intervals for PM task
performance. Although the LTA analysis is rigorous in selecting maintenance
tasks, it does not address task intervals. The interval for each maintenance
task is evaluated on the basis of the failure mode it prevents. The interval for
a condition-monitoring task depends on its ability to measure and detect a
reduction in the component's condition or performance before a failure occurs.
The same is also true of failure-finding tasks assigned to components with
potential hidden failures.
The requirement for the first interval for condition-monitoring tasks or
inspection is that the interval be long enough so that some physical evidence
of deterioration may be detected. Subsequent intervals shall be short enough
to ensure that further degradation is detected before failure occurs, so that
planned or condition-directed maintenance may be performed to prevent the
impending failure.
After the applicability and effectiveness of the conditioning-monitoring task
is established, a condition-directed task restoring the degraded condition-
detected by the condition-monitoring task may be determined and prepared.
The initial intervals for time-directed tasks are conservatively selected based
on operating and/or vendor information. These intervals should be adjusted
according to the component's reliability and as-found condition based on
review of PM task results and the component's maintenance history.
The following questions may be of assistance in determining appropriate task
interval for time-directed and condition-monitoring tasks:
How frequently does the failure mode occur that the task is designed
to prevent?
How much time elapses between initiation of degradation and
functional failure?
Can the failure progression or component degradation be measured
adequately?
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