05000313/FIN-2012005-03
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Finding | |
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| Title | Failure to Adequately Evaluate Discolored Boric Acid on ReactorMake-up Water Pipe |
| Description | The inspectors identified a finding for the failure to perform an adequate boric acid evaluation on the reactor make-up water pipe located in the overhead of the train B charging pump room. The licensee entered this issue into the corrective action program as Condition Report CR-ANO-C-2012-03119 The inspectors determined that the failure to adequately evaluate the reddish to brownish discoloration near a reactor make-up water pipe fillet weld and demonstrate that the structural integrity of the weld or the pipe was not adversely impacted was a performance deficiency. This finding was more than minor because it is associated with the Initiating Events Cornerstone attribute of performance and affects the cornerstone objective to limit the likelihood of those events that upset plant stability and that challenge critical safety functions during power operations and if left uncorrected, the performance deficiency would have the potential to lead to a more significant safety concern. Specifically, if licensee personnel continue to perform boric acid evaluations under the assumption that reddish to brownish discoloration on stainless steel pipe at low temperature is not indicative of localized corrosion, a more significant instance of corrosion on stainless steel pipe may not be appropriately evaluated and corrected. Using Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, the finding was determined to be of very low safety significance (Green) because the finding could not result in exceeding the reactor coolant system leak rate for a small loss-ofcoolant accident, nor could the finding have likely affected other systems used to mitigate a loss-of-coolant accident resulting in a total loss of their function. This finding had a cross-cutting aspect in the area of human performance, associated with the decision-making component, because the licensee failed to use conservative assumptions in decision-making and adopt a requirement to demonstrate that the proposed action is safe in order to proceed rather than a requirement to demonstrate that it is unsafe in order to disprove the action. Specifically, the licensee inappropriately assumed that the discoloration on the reactor make-up water line was staining by migrating particulate without fully evaluating other possible causes of the discoloration. |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2012005 Section 1R08 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.08 |
| Inspectors (proximate) | A Fairbanks A Sanchez C Osterholtz D Allen J Drake N Hernandez R Latta S Hedger T Buchanan T Farina W Schaup |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Arkansas Nuclear - IR 05000313/2012005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2012Q4
Self-Identified List (Arkansas Nuclear)
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