CAT Chat Minutes

August 13, 1999

Information and Follow-up Items

Can the APS put notices up on the television screens after power failures to announce the cause for the failure?

Such failures often require substantial investigation to determine the cause. This process can be time consuming and definitive answers may not be available at the time the power is restored.

User Operations

Availability for the week has been at about 89%. The mean time between failures has been low due to various causes, including problems with IOC communication, water system problems, etc. A 48-hour studies period is scheduled to begin at 8:00 a.m. Monday, August 16, and will end at 8:00 a.m. Wednesday, August 18.

The APS has experienced two recent power outages. The root cause(s) of the first power outage is still being investigated. The second power outage (which lasted approximately 30 minutes and happened during a studies period) occurred when safety straps were not removed from some bus work in another part of the laboratory before the system was re-energized, creating a ground fault. The power loss resulted in three lost hours of user time. At this time, we are running on only one transformer. The transformer involved in the first failure is still being repaired.

General Information

One quarter of the liquid-nitrogen distribution system has been filled and is maintaining level. The system is not ready to supply liquid nitrogen yet but can be used to test the setup. The system appears to be working well, and some users are gearing up to tie in to the lines. Successive modules are following at about three-week intervals. It is anticipated that the project will be finished in early November.