05000220/FIN-2009004-01
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Finding | |
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| Title | Unqualified HPCS Pump Power Cables Used in Submerged Conditions |
| Description | An NRC-identified non-cited violation (NCV) of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified, in that Nine Mile Point Nuclear Station (NMPNS) failed to maintain the Unit 2 high pressure core spray (HPCS) pump power cables in an environment for which they were designed. Although NMPNS had indications that these cables were periodically submerged in water, they could not demonstrate that the cables were designed for submerged conditions. As immediate corrective action, NMPNS dewatered and inspected the HPCS cable run, and changed the frequency of dewatering to monthly. Based on the inspection results, along with the cable design specifications and most recent test results, NMPNS concluded that the HPCS pump power cables would remain operable while they conduct a design change evaluation to examine methods to reduce cable exposure to submerged conditions. The issue was entered into the corrective action program (CAP) as condition report (CR) 2009-2901.The finding was more than minor because, if left uncorrected, it had the potential to lead to a more significant safety concern. The finding affected 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. The finding was of very low safety significance because it was a qualification deficiency that did not result in loss of operability. The finding had a cross-cutting aspect in the area of problem identification and resolution, operating experience, because NMPNS did not use operating experience, such as Generic Letter (GL) 2007-01, Inaccessible or Underground Power Cable Failures That Disable Accident Mitigation Systems or Cause Plant Transients, to evaluate possible adverse effects of periodic submergence of the HPCS pump power cables (P.2.a per IMC 0305). |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2009004 Section 4OA2 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | L Scholl D Dempsey K Kolaczyk B Haagensen J Furia G Dentel J Krafty E Knutson S Shaffer N Perry O Ayegbiso |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Nine Mile Point - IR 05000220/2009004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Nine Mile Point) @ 2009Q3
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