05000272/FIN-2011009-01
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Finding | |
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| Title | Untimely Completion of Corrective Actions Results in No. 11 Service Water Strainer Trip Due To Grassing |
| Description | The inspectors identified a self-revealing apparent violation of 10 CFR 50, Appendix B, Criterion XVI, Corrective AGtion, because the 11 service water strainer overloads tripped on February 9, 2011, due to binding of the strainer rotating drum, which rendered the 11 service water strainer pump inoperable and unavailable. The binding occurred because PSEG did not complete timely corrective actions for a condition adverse to quality identified following an April 4,2010, 11 service water strainer trip. Specifically, PSEG did not repair excessive grooves identified on the 11 service water strainer body wear surface by taking the actions specified in their corrective action program in January 2011. As a result, the grooves caused river grass to become trapped between the rotating strainer drum and the body wear surface, which eventually bound and tripped the strainer overloads. As corrective action, before the next spring grassing season, PSEG will temporarily fill in the grooves on the 11 service water strainer body wear surface and then trend the body wear ring condition for future replacement with a monel wear ring. PSEG entered this issue into the corrective action program as 20523166. This performance deficiency was more than minor because it was associated with the equipment performance attribute of the initiating events and mitigating systems cornerstones. The finding affected the cornerstones\' objectives to limit the likelihood of those events that could upset plant stability and challenge critical safety functions during power operations and to ensure the availability and reliability of systems that respond to initiating events to prevent undesirable consequences. Specifically, not promptly correcting the excessive grooving identified on that strainer\'s body wear ring degraded the availability and reliability of the 11 service water train. The significance of this finding is designated as To Be Determined (TBD) until a regional senior reactor analyst completes a Phase 3 analysis, in accordance with IMC 0609, Appendix A, Determining the Significance of Reactor Inspection Findings for At-Power Situations (IMC 0609A). Phase 1 screened the finding to Phase 2 because the inspectors concluded that the finding contributed to both the likelihood of a reactor trip and the likelihood that mitigating systems would not have been available. This conclusion was based upon the increased chance of a loss of service water given one train being removed for strainer repairs and the loss of redundancy in the service water system to cool mitigating equipment over the assumed 53 hour6.134259e-4 days <br />0.0147 hours <br />8.763227e-5 weeks <br />2.01665e-5 months <br /> exposure period. The Phase 3 analysis was required because the Salem Pre-solved Risk-Informed Inspection Notebook does not address the loss of one train of service water. This finding has a cross-cutting aspect in the area of problem identification and resolution, corrective action program, because PSEG did not take appropriate corrective actions to address a safety issue in a timely manner, commensurate with the safety-significance and complexity P.1(d). Specifically, PSEG did not implement timely actions to repair excessive grooves identified in the 11 service water strainer body wear ring in January 2011 because work control documents were not correctly coded in July 2010. |
| Site: | Salem  |
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| Report | IR 05000272/2011009 Section 4OA2 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Burritt C Douglas L Cline M Modes P Mckennaa Burritt A Turilin C Douglas D Schroeder E Gray J Furia P Mckenn |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Salem - IR 05000272/2011009 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Salem) @ 2011Q3
Self-Identified List (Salem)
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