ML090440020
| ML090440020 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 02/13/2009 |
| From: | Gerald Gulla, Nick Hilton NRC/OE |
| To: | |
| Gulla G. 415-2872 | |
| References | |
| EA-08-324 RN-09-008 | |
| Download: ML090440020 (2) | |
Text
PRELIMINARY INFORMATION - NOT FOR PUBLIC DISCLOSURE UNTIL VERIFICATION THAT LICENSEE HAS RECEIVED ACTION PRELIMINARY INFORMATION - NOT FOR PUBLIC DISCLOSURE UNTIL VERIFICATION THAT LICENSEE HAS RECEIVED ACTION February 13, 2009 RN-09-008 OFFICE OF ENFORCEMENT NOTIFICATION OF SIGNIFICANT REGULATORY ACTION Licensee:
Duke Power Company, LLC (EA-08-324) d/b/a Duke Energy Carolinas, LLC Oconee Nuclear Station Docket No. 05000269
Subject:
ISSUANCE OF FINAL SIGNIFICANCE DETERMINATION This is to inform the Commission that a White Significance Determination Process (SDP) finding will be issued on or about February 19, 2009, to Duke Energy Carolinas, LLC (DEC) as a result of inspections at the Oconee Nuclear Station. This White finding, an issue with low to moderate safety significance, involved a maintenance procedure that failed to identify and electrically isolate all main generator automatic voltage regulator (AVR) trip outputs to the main generator lockout relay. Consequently, during AVR maintenance on DEC Oconee Unit 1 generator on April 15, 2008, a main generator lockout occurred, resulting in a loss of power event that ultimately led to a loss of reactor coolant system inventory while in Mode 6 (reactor head closure bolts de-tensioned) on decay heat removal. As such, this finding was considered to have a cross-cutting aspect associated with a procedure, as described in the resources component of the human performance cross-cutting area.
Having resulted from an inadequate maintenance procedure for a non-safety-related component (i.e., Main generator AVR) the associated performance deficiency did not involve a violation of regulatory requirements. However, being contrary to a licensee standard, it was characterized as an Initiating Events cornerstone finding.
It should be noted that the licensee has not been specifically informed of the regulatory action.
The schedule of issuance and notification is:
Mailing of Final Significance Determination February 19, 2009 Telephone Notification of Licensee February 19, 2009 The State of South Carolina will be notified.
Contacts: Gerry Gulla, OE, (301) 415-2872 Nick Hilton, OE, (301) 415-3055
PRELIMINARY INFORMATION - NOT FOR PUBLIC DISCLOSURE UNTIL VERIFICATION THAT LICENSEE HAS RECEIVED ACTION PRELIMINARY INFORMATION - NOT FOR PUBLIC DISCLOSURE UNTIL VERIFICATION THAT LICENSEE HAS RECEIVED ACTION Distribution: RN-09-008, February 13, 2009 OWFN Chairman Klein Comm. Jaczko Comm. Lyons Comm. Svinicki SECY OCA OPA OIP OWFN EDO DEDR DEDMRS OE OGC NRR OI NSIR TWFN OCFO OP CENTER NMSS OIG OIS RES ACRS FSME Regional Offices RI RII RIII RIV MAIL PUBLIC OE staff DISTRIBUTION: (Hard copy)
C. Carpenter, OE S. Magruder, OE N. Hilton, OE G. Gulla, OE OE r/f EN binder Publicly Available X Non-Sensitive X ML090440020 OFFICE OE:ES OE:BC NAME G. Gulla N Hilton DATE 2/13/09 2/13/09 OFFICIAL RECORD COPY