Final Identification of Life-Limiting Components

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representatives of the engineering, operations, and maintenance departments. Proper selection of the

MCA team is vital to success.

The collection of information or data and the performance of MCA evaluations will likely be

accomplished in several iterations. Information developed or conclusions reached at a given point in

the program may invalidate prior information or conclusions, or it may indicate that more detail or

additional information is necessary. Data gathering may occur in stages as the aging evaluations

indicate the need for more data. Sources of information or data used to support the conclusions should

be documented.

Initially, the action plan should provide the greatest detail for those activities that need to be completed

in the near term. Moreover, the action plan should provide detailed discussions of those activities that

have already been completed. The MCA action plan may be revised and updated as the program

progresses.

4.2.1.2 MCA Governing and Implementing Procedures

The contractor should develop governing and implementing procedures for the MCA adjunct program.

Governing procedures serve to indicate the correlation of the action plan with the program plan and to

coordinate the implementing procedures with each other and with the action plan. Governing

procedures are, in effect, an umbrella document or overview of the implementation process.

Development of facility implementing procedures to support the action plan is necessary to ensure a

consistent approach to MCA and to promote the successful and cost-effective completion of the MCA

program. These procedures should address and control responsibilities associated with the

performance of analyses and with the preparation, review, and approval of documents. The

procedures should provide specific methods for identification of life-limiting components, detailed aging

degradation evaluations, determination of facility remaining lifetime, and feasibility for continued

operations or life extension.

4.2.2 FINAL IDENTIFICATION OF LIFE-LIMITING COMPONENTS

The final list of life-limiting components should be developed through a structured process based on

established criteria and a detailed scoring methodology. This list of components provides the subjects

for the detailed MCA analysis. A flow diagram for the identification of life-limiting components is shown

in Figure 42.

The primary activities of this process are:

Screen SSCs to identify components that are potentially life-limiting.

Determine significance to facility lifetime of potentially life-limiting components.

Identify the life-limiting components.

Personnel knowledgeable about the facility and its safety analysis should perform the screening of

SSCs to identify those components that are potentially life-limiting. These components should meet

one or more of the following criteria:

Replacement cost is large.

Replacement schedule is long.

Failure may have significant impact on facility safety.

Known history of safety concern exists.

Operating conditions or environment are relatively harsh.

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