Instrument Matrix

DOE-STD-1052-93

commitments associated with the component

cost of repair

mean-time-between-failures

input from vendors and other supplier programs (e.g., technical bulletins and

notices)

A list of all FCE should be compiled, this list should be useful in assigning priorities

and should provide a mechanism for tracking and documenting the status of

subsequent analysis.

7.7.1

Instrument Matrix

This section describes a method of identifying functionally critical

instruments. A system may contain hundreds of instruments and the analysis

of these instruments may be a formidable task. Many instruments perform

important system functions that should be preserved by a PM task. However,

some of these functions may not be identified during an analysis of system

functions or during development of a FMEA on FCE that has associated

instruments. To assist in identifying functionally critical instruments, a matrix

should be developed and used to identify the functions of the instrument and

their importance in maintaining system functions. This technique of using a

matrix has proven to be successful for evaluating instruments and provides

a good checklist to ensure that all functions of the instrument are identified

for analysis.

7.7.1.1

All instruments contained in the system should be listed on a

matrix containing an instrument function. The functions to be

listed on the matrix are listed below:

F I - provides a component, system, or plant trip function

F 2 - provides automatic control or interlock

F 3 - safety-related display instrumentation (e.g., as defined in

technical safety requirements and the FSAR)

F 4 - supports technical safety requirements

F 5 - provides alarm, indication, or recorder information to the

control room

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