ESR Turbine

Attendance

J. Creel K. Dixon M. Wright R. Norton D. Schleeper S. Radovic

Issue Statement

• When T2 at ESR trips off, the turbine continues to spin much longer than expected. The is a concern that the turbine will be damaged if it does not stop spinning when the inlet valve is closed. On a few occasions, the turbine continued to spin (~500Hz) until the the plant was re-started.

Agenda and Notes

1. What do we need to do to fix this problem.

  -Several things can be done to correct the issue.  The least impact (from an operational view) would be to isolate and warm up the turbine temporarily.

1. Is this really a problem (I think that this is a big problem)

  -Absolutely.  The bearing gas system isn't yet fully understood.  Regardless, a turbine spinning when bearing gas is not active would certainly wear the turbine.

1. Why do we think this is a problem (Is bearing gas on during that time)

  -See above.

1. Should we be doing something manually?

  -For long outages, consider closing the manual valve on the T2 outlet.

1. Other questions that we need to make sure we have answered.

Action Items

1. investigate bearing gas process at ESR
2. Verify LVDT on turbine inlet valve
3. Warm T2. Schedule. Dependent on transfer line.
4. Check seating force of T2 inlet valve (require trip?) (verify proper operation)
5. Can T2 be isolated to support troubleshooting without damaging turbine or stopping entire CBX?
6. Develop plan to isolate CBX in the event T2 must be stopped, and/or CBX must be tripped.
7. Verify that we have a spare.
8. What is required to check seating force (operationally)?
9. Create an alarm that will alert us when turbine inlet valves are closed and turbine speed is > 0.
10. drink a beer
11. Get the transfer line from CHL operational
12. follow-up meeting ~1/20/2017.
13. Contact Pete to begin information/data collection, vendors, contacts.