05000313/FIN-2008003-08
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Finding | |
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Title | Loss of 500 Kv Power Line Due to Switchyard Maintenance |
Description | The inspectors documented a self-revealing finding for emergent work performed outside of the original work scope that led to the loss of the Pleasant Hills 500 kV power line. Entergy switchyard technicians, while working on a switchyard breaker, stepped outside the bounds of the Arkansas Nuclear One work order and caused another breaker to trip. Consequently, the load dispatcher requested that the plant reduce the output power level and the licensee down-powered both units. The licensee entered the issue into the corrective action program as CR ANO-C-2008-1053, immediately stopped work in the switchyard, performed a stand down to reemphasize work procedures and expectations, and instituted supervisory tours of the work in the switchyard until the work was complete. The finding was more than minor because it was associated with the human error attribute and affected the Initiating Event Cornerstone objective to limit the likelihood of those events that upset plant stability during power operations. The significance of the finding was assessed using Manual Chapter 0609, Significance Determination Process, Phase 1 Worksheet. The finding was of very low safety significance (Green) because it did not contribute to the likelihood that mitigation equipment or functions would not be available. The finding had a cross-cutting aspect in the area of Human Performance associated with work practices because the licensee did not ensure supervisory and management oversight of work activities, including Entergy transmission network technicians, in the switchyard such that nuclear safety was supported [H.4.(c) |
Site: | Arkansas Nuclear |
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Report | IR 05000313/2008003 Section 4OA3 |
Date counted | Jun 30, 2008 (2008Q2) |
Type: | Finding: Green |
cornerstone | Initiating Events |
Identified by: | Self-revealing |
Inspection Procedure: | IP 71153 |
Inspectors (proximate) | L Ricketson P Elkmann G George S Graves A Sanchez W Walker W Sifre J Josey S Alferink C Young G Apger S Makor B Rice |
CCA | H.2, Field Presence |
INPO aspect | LA.2 |
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Finding - Arkansas Nuclear - IR 05000313/2008003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2008Q2
Self-Identified List (Arkansas Nuclear)
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