05000219/FIN-2003005-02

Finding

Title

Failure to Comply with 10 CFR 50, Appendix B, Criterion Xvi, Corrective Action, Related to a Cable Ground Fault and Subsequent Loss of 4.16KV Emergency Bus 1C

Description

A finding was identified by the NRC involving the failure to comply with 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, specifically the failure to take appropriate corrective actions following medium voltage cable failures in 1996 and 2001. As a result, on May 20, 2003, a ground fault on the cable running from the No. 1 EDG output breaker to the 4160 volt emergency bus 1C caused an unrecoverable loss of the 1C electrical bus. The loss of bus 1C, as well as the mitigating system and barrier integrity equipment powered from this bus, forced a Technical Specification required shutdown. This finding was more than minor because it was associated with the equipment performance attribute of the initiating events and mitigating systems cornerstones. Specifically, the failure of the cable associated with the 1C 4160 volt emergency bus resulted in the loss of the bus, which increased the likelihood of a reactor transient and caused the mitigating equipment powered from the bus to be unavailable to perform its safety function. A significance determination process (SDP) Phase 1 screening of this finding was performed and determined that the finding degraded both the initiating event and mitigating systems cornerstones. Therefore, an SDP Phase 2 evaluation was performed, which determined that the finding was of low to moderate safety significance (White). (Section 40A5)

02
Site:	Oyster Creek
Report	IR 05000219/2003005 Section 4OA5
Date counted	Dec 31, 2003 (2003Q4)
Type:	Violation: White
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:
Inspectors (proximate)	A Della J Herrera J Jang J Mcfadden J Williams J Wray N Mcnamara P Eselgroth R Barkley R Summers S Dennisa Bloughd Holody P Eselgroth W Lanning
INPO aspect
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v • d • e

Finding - Oyster Creek - IR 05000219/2003005

1(0)2(0)3(0)4(0)5(1)6(0)7(0)8(0)

IR 05000219/2003005: 2

Finding List (Oyster Creek) @ 2003Q4

CCA Matrix: 2003Q4

	Q	CCA	Title
05000219/FIN-2003005-02	2003Q4		Failure to Comply with 10 CFR 50, Appendix B, Criterion Xvi, Corrective Action, Related to a Cable Ground Fault and Subsequent Loss of 4.16KV Emergency Bus 1C

Self-Identified List (Oyster Creek)

[Oyster Creek Findings full list]

05000219/FIN-2003005-02

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