05000336/FIN-2010004-01
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Finding | |
|---|---|
| Title | Failure to Promptly Identify and Correct the Source of a Unit 2 RCS Pressure Boundary Leak |
| Description | The inspectors identified a Green, NCV of 10 CFR 50, Appendix B, Criterion XVI, Corrective Actions, for Dominion\'s failure to promptly identify and correct the source of a reactor coolant system (RCS) pressure boundary leak from July 3, 2009, through July 13, 2009. Dominion subsequently repaired the leak and returned to 100 percent power. The inspectors determined that Dominion\'s failure to promptly identify and correct the cause of pressure boundary leakage is a performance deficiency that was reasonably within Dominion\'s ability to foresee and correct and should have been prevented. This issue is more than minor because the issue is similar to NRC Inspection Manual Chapter (IMC) 0612, Appendix E, and minor example 2.g. The inspectors determined that the issue affected the Initiating Events Cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. The inspectors concluded that this condition, assuming the worst case degradation, would not have affected other mitigating systems resulting in a total loss of their safety function. Accordingly, the finding was determined to be of very low safety significance (Green) using IMC 609, Attachment 0609.004, Phase 1 Screening Worksheet. The inspectors determined that this issue had a crosscutting aspect in the Problem Identification and Resolution cross-cutting area, Corrective Action Program component, because Dominion did not identify the pressure boundary leakage completely, accurately, and in a timely manner commensurate with its safety significance. [P.1 (a)] |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2010004 Section 4OA2 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | T Moslak D Jackson B Haagensen J Krafty S Shaffer M Balazik L Kauffman K Modes |
| CCA | P.1, Identification |
| INPO aspect | PI.1 |
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Finding - Millstone - IR 05000336/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2010Q3
Self-Identified List (Millstone)
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