05000382/FIN-2011004-06
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Finding | |
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| Title | Untimely Actions to Correct Repetitive Dry Cooling Tower Fan Failures |
| Description | The inspectors identified a non-cited violation of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, because the licensee did not promptly correct a condition adverse to quality related to repetitive failures of the dry cooling tower fans to start and run in fast speed. Specifically, the licensee did not perform corrective actions to resolve the failure mechanism of the fast speed breaker relay in a timely manner. As a result, additional failures occurred over a period of several years prior to the implementation of corrective action in March 2011. The licensee entered this issue into their corrective action program for resolution as CR-WF3- 2011-2546. The corrective action includes a plan to replace the affected components inside the dry cooling tower fan breakers with a new design. The finding is more than minor because it is associated with the equipment performance attribute of the Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the inspectors concluded that the reoccurrence of the problem challenged the reliability, and capability of the dry cooling tower fans. The inspectors performed the initial significance determination for the failure to start the dry cooling tower fans in fast speed using NRC Inspection Manual Chapter 0609, Attachment 0609.04, Phase 1 Initial Screening and Characterization of Findings. The Initial screening directed the inspectors to use Attachment 1 of Appendix G, Shutdown Operations Significance Determination Process, based on fact that the failures of the breaker relay to start in fast speed occurred during refueling outages. The inspectors determined that the finding was of very low safety significance (Green) because it did not require a quantitative assessment since adequate mitigating equipment remained available and it did not constitute a loss of control, as defined in Appendix G. This finding has a cross-cutting aspect in the resource component of the human performance area in that the licensee did not minimize long-standing equipment issues and maintenance deferrals |
| Site: | Waterford  |
|---|---|
| Report | IR 05000382/2011004 Section 4OA2 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | M Davis S Garchow J Melfi R Azua D Overland E Uribe |
| CCA | H.6, Design Margins |
| INPO aspect | WP.2 |
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Finding - Waterford - IR 05000382/2011004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Waterford) @ 2011Q3
Self-Identified List (Waterford)
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