[i.e., it corrected the original problem(s)]; it should also prove that no problems were
introduced as a result of the maintenance activities.
The maintenance work control package or maintenance procedure should specify the type
and duration of post-maintenance testing required. For some facilities, the specific
requirements to prove operability of safety-related systems are identified in Technical Safety
Requirements (e.g., Technical Specifications, Operational Safety Requirements, etc.). An
engineering evaluation should determine whether additional testing or different methods are
required whenever the scope of work is changed, e.g., when additional work is performed
to correct a previously undisclosed problem that is discovered during maintenance. All
equipment functions that may have been affected by the maintenance should be tested.
Operation of the equipment for testing should be performed by qualified operations
personnel in accordance with approved procedures. Maintenance personnel should monitor
the testing. The operations supervisor is ultimately responsible for ensuring that the testing
proves the operability of the equipment.
4.9 Temporary Modification Control
Facilities should establish administrative control systems for approving, installing, and
monitoring temporary modifications. Temporary modifications may include electrical
jumpers, lifted leads, pulled circuit boards, disabled annunciators or alarms, mechanical
jumpers or bypasses, temporary setpoint changes, installed or removed blank flanges,
disabled relief or safety valves, installed or removed filters or strainers, plugged floor drains,
and temporary pipe supports.
Prior to installing the temporary modification, the administrative control system should
provide for the following activities:
Communicate the proposed modification to the design authority to allow for evaluation
of the modification's impact on current design activities and system characteristics,