05000220/FIN-2013007-01
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Finding | |
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| Title | Failure to Identify and Correct a Condition Adverse to Quality Associated With HPCS Medium Voltage Power Supply Cables |
| Description | The inspectors identified an NCV of 10 CFR 50, Appendix B Criterion XVI, Corrective Actions, because between November 5, 2012, and July 22, 2013, NMPNS did not promptly identify and correct a failed automatic de-watering system for the buried high pressure core spray (HPCS) medium voltage power supply cable duct bank. As a result, on July 22, 2013, NMPNS unexpectedly discovered significant water level in the two manholes that contained the buried HPCS cable duct bank. NMPNS subsequently determined that multiple level switches for the de-watering system had failed. In response, NMPNS pumped down the affected manholes, replaced the failed level switches and initiated weekly manual pump downs of the manholes until final corrective actions could be completed. NMPNS entered this performance deficiency into the NMPNS CAP under CR-2013-006992. The inspectors determined that this performance deficiency was more than minor because if left uncorrected the failed automatic dewatering system would have become a more significant safety concern. Specifically, with no preventative maintenance (PM) task to inspect and test the dewatering system and no work order (WO) scheduled to investigate the cause of the MH-1 hi-hi level alarm, the inspectors determined that, based on NMPNS previous experience of rising level in this manhole and wetting of these cables, it was not likely that NMPNS would identify the failed de-watering system before the HPCS power supply cables were wetted. Wetted cables become a more significant concern because, in accordance with industry and NRC operating experience, the long term reliability of medium voltage cables is negatively affected when wetted. In accordance with IMC 0609.04, Initial Characterization of Findings, and Exhibit 2 of IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, issued June 19, 2012, the inspectors determined that the finding was of very low safety significance (Green), because the finding was not a design or qualification deficiency, did not represent a loss of safety system function, and did not screen as potentially risk significant due to external initiating events. The inspectors determined that this finding had a cross-cutting aspect in the area of human performance, resources, because NMPNS did not maintain long term plant safety by maintenance of design margins, minimization of long-standing equipment issues, minimizing PM deferrals, and ensuring maintenance and engineering backlogs which are low enough to support safety. Specifically, an NMPNS planner changed the scope of a PM task to eliminate inspecting MH-1 and MH-3 cable ducts every six months, and as a result, PM activities were not performed in November 2012 and May 2013. This error prevented NMPNS from identifying the condition adverse to quality associated with the HPCS medium voltage power supply cable duct bank de-watering equipment. |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2013007 Section 4OA2 |
| Date counted | Sep 30, 2013 (2013Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | D Schroeder B Smith A Turilin E Miller |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Nine Mile Point - IR 05000220/2013007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Nine Mile Point) @ 2013Q3
Self-Identified List (Nine Mile Point)
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