05000336/FIN-2011002-01
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Finding | |
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| Title | Failure to Prevent Safety Related Cables from Being Submerged |
| Description | A self-revealing Green non-cited violation (NCV) of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified for Dominion\'s failure to maintain safety related cables in an environment for which they were designed. Specifically, 480V safety related cables, which are not qualified for continuous submergence, were found submerged in a cable vault since approximately October 20, 2010, to March 14, 2011. Dominion took immediate corrective action to remove the water from the cable vault and entered the issue into their corrective action program (CAP). The inspectors determined that the finding was more than minor because if left uncorrected, the performance deficiency would have the potential to lead to a more significant safety concern. Specifically, the inspectors noted that the insulation of continuously submerged cables would degrade more than dry or periodically wetted cables, which would lead to failures. The finding was of very low safety significance (Green) because the finding was not a design or qualification deficiency which resulted in a loss of operability or functionality, did not represent a loss of system safety function, did not represent an actual loss of safety function of a single train for greater than its Technical Specification allowed outage time, did not represent an actual loss of safety function of one or more non-Technical Specification trains of equipment designated as risk-significant for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and was not potentially risk significant due to a seismic, flooding or severe weather initiating event. The inspectors determined that the finding had a cross-cutting aspect in the Problem Identification and Resolution crosscutting area, Operating Experience component, because Dominion did not effectively implement Operating Experience to prevent submergence of safety related cables. P.2(b) |
| Site: | Millstone  |
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| Report | IR 05000336/2011002 Section 1R06 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | B Haagensen D Jackson J Krafty P Presby S Shaeffer T Moslak W Schmidt |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Millstone - IR 05000336/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2011Q1
Self-Identified List (Millstone)
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