05000285/FIN-2011006-02
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Finding | |
|---|---|
| Title | Inadequate Corrective Actions to Ensure the Reliability of the RAW Water Pump Power Cables |
| Description | The NRC identified a cited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for failure to take effective corrective action following the initial discovery of water intrusion in cable vault manholes MH-5 and MH-31 in 1998, 2005, 2009, and 2011. Specifically, the licensee failed to take effective corrective action to establish an appropriate monitoring frequency, which took into account variable environmental conditions to mitigate potential common mode failure of raw water 4160 V motor cables in underground ducts and manholes identified during the Component Design Basis Inspection performed in 2009. The violation is being cited because the licensee had failed to restore compliance in a reasonable period following documentation of the issue as a non-cited violation issued December 30, 2009. The failure to take effective corrective action to ensure the reliability and capability of the safety-related cables powering the raw water pump motors was a performance deficiency. Furthermore, the finding was within the licensee\\\'s ability to foresee and correct because the licensee had multiple opportunities to correct the continuing challenge to the safety-related cables and raceways for the raw water system over an extended period. The finding was more than minor because it adversely affected the Mitigating Systems Cornerstone attribute of design control for ensuring the availability, reliability, and capability of systems that respond to Initiating Events to prevent undesirable consequences. The finding is of very low safety significance because it was a design deficiency that did not result in loss of operability or functionality. This finding has a crosscutting aspect in the decision-making program component of the human performance area because the licensee failed to use conservative assumptions in decision-making and adopt a requirement to demonstrate that the proposed action was safe in order to proceed rather than a requirement to demonstrate that it was unsafe in order to disapprove the action. Specifically, from 2005 until 2011, the licensee chose to postpone installation of proposed water level control corrective actions and failed to appropriately monitor water intrusion into underground ducts and manholes MH-5 and MH-31 for raw water 4160 V motor cables multiple times |
| Site: | Fort Calhoun  |
|---|---|
| Report | IR 05000285/2011006 Section 4OA2 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | Violation: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | D Kern D Stearns G Apger G Ryan J Dean J Drake J Kirkland J Wingebach M Hay P Elkmann R Deese S Sanchez W Sifre B Larson C Norton C Zoiac Osterholtzh Freeman J Wingebach R Alexander R Cohen R Lattag Pickj Dixong Meyerg Miller G Pick J Melfi J Rivera Ortiz S Makor |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Fort Calhoun - IR 05000285/2011006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fort Calhoun) @ 2011Q4
Self-Identified List (Fort Calhoun)
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