48: Scope Issue
Definition/Typical Issues
Did the fault-finding maintenance and inspection issue testing fail to include all applicable portions of the system (i.e., detection system, control systems, actuation systems, and the actual components)?
Note 1: Fault-finding maintenance and inspection are usually applicable to standby systems or the detection of hidden failures in systems.
Examples
Example 1
- A second cooling pump was installed as a spare. It was designed to start when the primary pump fails. The standby pump is smaller than the primary and so it is seldom used. The pump is tested when it is periodically placed in service (although this is not done on any schedule). However, the auto start system is never tested. As a result, the standby pump failed to start following an emergency shutdown of the primary pump.
Example 2
- Testing of an emergency diesel generator backup system only involved starting and synchronizing the generator to the gird. However, the test did not involve loading the generator.
Typical Recommendations
Check fault-finding testing procedures to ensure that they test the entire system and not just a portion of it. Check to see that the following portions of the system are included:
- Detection systems (i.e., systems that detect low voltage to start an emergency generator)
- Actuation systems (i.e., the parts of the system that tell the standby component to start)
- The component itself (i.e., the diesel generator)
Identify emergency response equipment, including required inspections and tests, and establish a system to ensure that equipment is properly maintained and tested.
Identify emergency evacuation equipment, including required inspections, tests, and other preventive maintenance or replacement activities, and establish a system to ensure that equipment is properly maintained and tested.
Cross-References
| Version 10 Element(s) | |
|---|---|
| Node ID | Node Name |
| 48 | Scope LTA |
| Maritime Element(s) | |
|---|---|
| Node ID | Node Name |
| 61 | Scope Issue |