05000313/FIN-2010003-03
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Finding | |
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| Title | Failure to Recognize Critical Dimension Results in Reactor Coolant Pump Seal Failure |
| Description | The inspectors documented a self-revealing finding associated with the third stage seal failure of reactor coolant pump P-32C on April 18, 2010. Specifically, during reassembly of reactor coolant pump P-32C, the licensee failed to recognize and maintain the gap between the pumps slinger ring and splash shield as a critical dimension which was required for successful operation of the seal assembly. This lack of recognition resulted in the failure of the pumps third stage seal, and an increase in reactor coolant system leak rate. This issue was entered into the licensees corrective action program as Condition Report CR-ANO-1-2010-1896
The performance deficiency was determined to be more than minor because it was associated with the design control attribute of the Initiating Events Cornerstone, and affected the associated cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as at power operations, and is therefore a finding. Specifically, the failure to recognize and maintain the gap between the reactor coolant pumps slinger ring and splash shield as a critical dimension resulted in the failure of the pumps third stage seal. Using NRC Manual Chapter 0609, Significance Determination Process, Phase 1 Worksheets, the finding was determined to have very low safety significance because assuming worst case degradation, the finding would not result in exceeding the technical specification limit for any reactor coolant system leakage; nor could the finding have likely affected other mitigation systems resulting in a total loss of their safety function. The inspectors determined that since the licensee had not recently re-evaluated what dimensions were critical to the seals operation and vendor documents were not specific to this dimension; this finding did not represent current plant performance and therefore did not have a crosscutting aspect associated with it. |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2010003 Section 1R20 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | J Josey J Rotton N Greene A Sanchez D Stearns E Uribe G George J Clark |
| INPO aspect | |
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Finding - Arkansas Nuclear - IR 05000313/2010003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2010Q2
Self-Identified List (Arkansas Nuclear)
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