05000331/FIN-2014008-01
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Finding | |
|---|---|
| Title | Failure to Verify Design Adequacy of Loss of Voltage Relay Setting |
| Description | The inspectors identified a finding having very low safety significance and an associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to ensure the Loss of Voltage Relay trip settings were properly established. Specifically, the licensee failed to consider trip setting coordination requirements with the essential bus and essential load feeders' over-current relay trip setpoints for postulated fault induced voltage dip events. This finding was entered into the licensees Corrective Action Program and the licensees preliminary verification determined the Loss of Voltage Relay settings were still operable but non-conforming. The inspectors determined the performance deficiency was more than minor because if left uncorrected, the performance deficiency had the potential to lead to a more significant safety concern. Specifically, the isolation of postulated faulted loads by under-voltage relay actuation in lieu of overcurrent relay actuation would have increased the likelihood of events that upset plant stability and affected the availability and reliability of the preferred alternating current power supply. The inspectors determined the finding was of very low safety significance (Green) because it did not cause a reactor trip and the loss of mitigation equipment relied upon to transition the plant from the onset of the trip to a stable shutdown condition. The inspectors did not identify a cross-cutting aspect associated with this finding because the finding was not representative of the licensees current performance. |
| Site: | Duane Arnold  |
|---|---|
| Report | IR 05000331/2014008 Section 1R21 |
| Date counted | Sep 30, 2014 (2014Q3) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | A Dahbur A Stone B Jose C Edwards J Braisted J Chiloyan N Valos |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Duane Arnold - IR 05000331/2014008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Duane Arnold) @ 2014Q3
Self-Identified List (Duane Arnold)
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