05000219/FIN-2010008-02
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Finding | |
|---|---|
| Title | EDG Low Voltage Control Cable Submergence |
| Description | The team identified a finding of very low safety significance (Green) involving an NCVof 10 CFR 50, Appendix B, Criterion III, Design Control. Specifically, Exelon did not maintain safety-related emergency diesel generator (EDG) instrumentation and low voltage control cables in the EDG cable trenches from becoming submerged, which resulted in subjecting the cables to an environment for which they were not qualified. Exelon entered the issue into their corrective action program and determined that there was no impact to EDG operability based on the observed condition of the cables and no apparent signs of degradation. The finding was determined to be more than minor because the finding was associated with the Mitigating Systems Cornerstone attribute of equipment performance and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, Exelon did not maintain the cables for the EDG 1 and EDG 2 in an environment for which they were designed when the cables were allowed to be submerged in a below grade trench without ensuring adequate drainage. The team determined the finding could be evaluated using the SDP in accordance with IMC 0609, Significance Determination Process, Attachment 0609.04, Phase 1 - Initial Screening and Characterization of Findings. The finding was of very low safety significance because it was a qualification deficiency confirmed not to result in a loss of operability. The performance deficiency had a cross-cutting aspect in the area of human performance, Resources, because Exelon did not ensure that personnel, equipment, procedures, and other resources were available and adequate to maintain long term plant safety through minimization of long-standing equipment issues. Specifically, Exelon did not correct long-standing deficiencies that allowed debris to block the drains allowing the cables to become submerged. Additionally, procedures were not adequate to ensure that the trenches were inspected and the drains were maintained to ensure that they remained free of debris. [IMC 0310, Aspect H.2.(a)) |
| Site: | Oyster Creek |
|---|---|
| Report | IR 05000219/2010008 Section 1R21 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | C Cahill J Schoppy F Arner S Kobylarz S Spiegelman L Doerflein P Mckenna A Dugandzic |
| CCA | H.6, Design Margins |
| INPO aspect | WP.2 |
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Finding - Oyster Creek - IR 05000219/2010008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Oyster Creek) @ 2010Q3
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