Post-Modification Tests

DOESTD107393

to deviate from the design requirements. Surveillance testing techniques are similar in many ways to

those used In SSC performance monitoring. A comprehensive surveillance testing program ensures

that the identified testing is scheduled and performed, the results are reviewed and trended, and

necessary corrective actions are taken to return equipment performance to within the design

requirements.

The periodic equipment performance monitoring function should take credit for periodic surveillance

testing, where appropriate. Full integration of the surveillance test program with other periodic

equipment monitoring can provide efficiencies in manpower and scheduling. Periodic testing, beyond

that in the TSR surveillance requirements, may be adjusted both In frequency and degree of technical

content based on the importance of the SSC or the particular SSC function. The origin of various

testing requirements should be documented and maintained.

DOE 4330.4A, Maintenance Management Program, establishes preventive and predictive maintenance

activities, such as tests, inspections, diagnostics, and trending. It further requires that a documented

basis for planned preventive and predictive maintenance activities should be provided. Existing

program to satisfy these Order requirements should provide a good interface with the CM program.

Existing programs should be reviewed to determine whether they are adequately oriented toward

maintaining configuration and achieving the associated CM program objectives.

Aging degradation monitoring is an important subset of equipment performance monitoring. It is

directed at detecting the impact of known and anticipated aging degradation mechanisms. The MCA

adjunct program will establish the technical basis for inspection and testing activities to trend important

characteristics, anticipate the time of failure, and detect component degradation, which can result in

systems and components operating outside their design requirements. The results of the MCA

program will be reviewed by the design authority to determine which should be implemented within the

periodic monitoring function (i.e., new design requirements). The assessments element supports the

MCA adjunct program by coordinating implementation of identified monitoring actions performed

throughout the life of the facility (i.e., during ongoing MCA implementation, after development).

2.5.3.4 Post-Modification Tests

Post-modification tests are performed each time an important SSC is installed or modified. These tests

ensure that the SSC meets the design requirements and is verified to be operable prior to being placed

into service initially or returned to service. This function prevents unintended changes from being

introduced through errors during design or construction. For physical changes, these tests serve as a

final and independent adequacy check of the design and technical reviews for the change. If a

changed SSC fails to meet its acceptance criteria, ft may not be turned over for normal operations until

either a technical review has been completed and any follow-up actions completed or the SSC is

returned to its original condition and tested satisfactorily.

The fully developed program should include (1) implementing procedures established to specify and

control post-modification testing and (2) acceptance criteria defined consistent with the design

requirements. A recommended approach is to develop a generic procedure for identifying the post-

modification tests to be performed and to invoke this procedure each time a facility change is made.

For the post-modification tests to be effective, test conditions should be consistent with normal and

emergency operating conditions and acceptance criteria should demonstrate that the applicable design

requirements are met. The dominant factor affecting the level of effort for post-modification testing is

the complexity of the design change involved.

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