Analysis Stategy for Critical and Noncritical Components

DOE-STD-1052-93

7.7.1.3

After each instrument has been analyzed, the matrix should be

returned to the analyst. The results of all the responses are

combined into a master matrix. Based on the collective

responses, the analyst determines the importance of each

instrument. The first three functions (Fl, F2, and F3) listed on

the matrix are important system functions. Instruments that

implement these functions are typically associated with other

FCE. Instruments that perform functions F4 through F9 of

Section 7.7.1.1 should be considered for an FMEA based on

the instrument's use, its required accuracy, and consequence of

its failure.

7.8

Analysis Stategy for Critical and Noncritical Components

The two analysis strategies presented in this section are the failure modes analysis of:

(1) critical and (2) noncritical components.

7.8.1

Noncritical Component Strategy

The strategy for noncritical components is to evaluate existing PM tasks and

the components, considering the consequences of deleting the tasks. The

analysis of noncritical components often provides the greatest opportunity to

optimize use of resources by identifying unnecessary or inappropriate PM tasks.

After the list of FCE has been identified and analyzed, the noncritical

components should be reviewed and evaluated. An analysis of the PM

programs for noncritical components may justify the deletion or modification

of existing tasks or provide an economic basis that should allow the

component to run-to-failure. The analysis of noncritical components may also

result in a reduction of maintenance man-hours, spare part inventories, and

radiation exposure. In addition, this should allow maintenance personnel to

concentrate their efforts on components that are important to plant operation

and safety.

A minimum review of noncritical components should consist of a review of the

maintenance history, total PM tasks, and vendor information for the

component. This review should identify recurring or highly probable failure

modes. If the failure rate of the noncritical component is high and its repeated

failures are not cost-effective, then effective PM tasks or design changes may

be used to control the failure rate. Noncritical components with an acceptable

failure rate and whose failure consequences are economically tolerable should

be considered for run-to-failure operation.

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