05000390/FIN-2011005-01
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Finding | |
|---|---|
| Title | Failure to develop and implement corrective actions for PMP Drainage Path Impact on Unit 1 |
| Description | The inspectors identified an NCV of 10 Code of Federal Regulations (CFR) 50 Appendix B, Criterion XVI, Corrective Action, for the licensees failure to develop and implement corrective actions to address the unauthorized placement of temporary structures supporting Unit 2 construction in the probable maximum precipitation (PMP) drainage path. Problem Evaluation Report (PER) 206105, initiated by the licensee on October 28, 2009, identified that Unit 2 temporary structures had been placed inside the plant protected area surrounding Unit 1 and 2 without verifying impacts to the PMP critical flood elevation of 729 feet. The PER required a corrective action plan (CAP) due date of February 14, 2010. The condition as it then existed was bounded by a functional evaluation which expired February 28, 2010. The inspectors determined that the corrective actions had not been implemented and that the original adverse condition had worsened due to the addition of other temporary structures. Based on this observation, the licensee reentered the issue into the corrective action program as PER 413818 and also initiated PER 417148 to address the continuing plant impact from the addition of more temporary structures. The licensees failure to develop and implement corrective actions to preclude the unauthorized placement of temporary structures in the PMP drainage path was a performance deficiency. The inspectors reviewed Inspection Manual Chapter (IMC) 0612 and determined that the finding was more than minor because if left uncorrected, would have the potential to lead to even more temporary structures being added to the PMP drainage path thus exceeding the critical flood level of 729 feet, at which point safety-related structures, systems, and components would be adversely impacted. Additionally, the finding was associated with the protection against external factors attribute of the Initiating Events cornerstone and adversely affected the cornerstone objective of limiting the frequency of those events that upset plant stability and challenge critical safety functions, during shutdown as well as power operations. The inspectors determined that the finding was of very low safety significance (Green) because, at the point the licensee gained control of adding temporary structures, the modeled PMP basin water level was two tenths of a foot below the elevation leading to flooding of safety-related structures, systems, and components. The cause of the finding had a cross-cutting aspect in the area of problem identification and resolution associated with the CAP component because the licensee failed to develop and implement corrective actions to address the unauthorized placement of temporary structures supporting Unit 2 construction in the PMP drainage path. |
| Site: | Watts Bar  |
|---|---|
| Report | IR 05000390/2011005 Section 1R01 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.01 |
| Inspectors (proximate) | S Shaeffer P Higgins R Baldwin K Miller W Deschaine N Childs R Monk |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Watts Bar - IR 05000390/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2011Q4
Self-Identified List (Watts Bar)
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