05000461/FIN-2010002-07
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Finding | |
|---|---|
| Title | Main Turbine Trip During On-line Testing |
| Description | The inspectors evaluated outage activities during Unit 1 forced outage C1F53, which began on February 5, 2010. During the performance of turbine on-line testing with the unit at about 17 percent power and the main generator synchronized to the grid, the turbine unexpectedly tripped due to mechanical overspeed. The turbine mechanical trip device was mis-adjusted during the refueling outage, which caused the turbine trip logic to activate prematurely. The reactor remained on line while troubleshooting the cause for the turbine trip. The licensee synchronized the unit to the grid on February 8th. The inspectors reviewed plant equipment configuration, risk management, startup activities, and identification and resolution of problems associated with the outage. This inspection constituted one other outage inspection sample as defined in IP 71111.20. No findings of significance were identified with the conduct of forced outage activities. During the refueling outage, the turbine mechanical trip device trip finger plunger gap was mis-adjusted by the turbine vendor while performing an inspection. This mis-adjusted gap caused the turbine trip logic to activate prematurely during start-up testing, causing the forced outage. This issue is considered to be an Unresolved Item (URI 05000461/20100002-07, Main Turbine Trip During On-line Testing) pending the inspectors review of the licensees cause evaluation for the event. |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2010002 Section 1R20 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | M Holmberg R Jickling R Langstaff J Cassidy B Metrow B Kemker M Ring S Mischke D Lords E Coffman J Draper A Scarbeary D Sandb Kemkerd Lords D Melendez Colon E Coffman J Cassidy M Mitchell M Ring R Russell S Mischkea Scarbearyb Kemker D Lords J Bozga M Mitchell M Ring S Mischke |
| INPO aspect | |
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Finding - Clinton - IR 05000461/2010002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2010Q1
Self-Identified List (Clinton)
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