05000313/FIN-2010002-01
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Finding | |
|---|---|
| Title | Inadequate Root Cause Evaluation Failed to Prevent Main Feedwater Pump Thrust Bearing Failure |
| Description | The inspectors identified a Green finding for the licensees failure to develop an adequate root cause evaluation and subsequent corrective actions to prevent reoccurrence of main feedwater pump 2P-1A thrust bearing failure. Specifically, the licensees root cause evaluation for a thrust bearing failure on March 13, 2009, failed to identify that the main feedwater pump performance had been degrading and did not implement corrective actions to repair the pump during the Unit 2 refueling outage in September 2009. The pump thrust bearing failed again on December 8, 2009, which led to an unplanned manual reactor trip. The licensee entered the issue into their corrective action program as Condition Report CR-ANO-2-2009-3744. The failure to perform an adequate root cause evaluation to prevent the reoccurrence of the main feedwater pump 2P-1A thrust bearing failure was a performance deficiency. The performance deficiency was determined to be more than minor because if left uncorrected could become a more significant safety concern and is therefore a finding. Specifically, the failure to perform thorough and adequate root cause evaluations could lead to a more significant safety concern. Using Manual Chapter 0609, Attachment 4, Phase I worksheet, the finding was determined to be of very low safety significance, Green, because the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment or functions would not be available. The finding was determined to have a crosscutting aspect in the area of problem identification and resolution associated with corrective action program P.1(c), in that the licensee failed to adequately evaluate the problem with main feedwater pump 2P-1A thrust bearing failure and did not prevent reoccurrence following implementation of corrective action |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2010002 Section 4OA2 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Sanchez G Guerra J Clark J Rotton |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Arkansas Nuclear - IR 05000313/2010002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2010Q1
Self-Identified List (Arkansas Nuclear)
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