ML061380548
| ML061380548 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 05/10/2006 |
| From: | Brandi Hamilton Duke Energy Carolinas, Duke Energy Corp |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GL-96-006 | |
| Download: ML061380548 (3) | |
Text
BRUCE H HAMILTON Dukge Vice President 1a negy Oconee Nuclear Station Duke Energy Corporation ONO1VP / 7800 Rochester Highway Seneca, SC 29672 864 885 3487 864 885 4208 fax bhhamilton@duke-energy. corn May 10, 2006 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555
Subject:
Duke Power Company LLC d/b/a Duke Energy Carolinas, LLC Oconee Nuclear Station Docket Nos. 50-269, 50-270, 50-287 Generic Letter 96-06: Assurance of Equipment Operability and Containment Integrity During Design-Basis Conditions - Waterhammers -
Supplemental Information Regarding Modification Schedules Generic Letter (GL) 96-06, "Assurance of Equipment Operability and Containment Integrity During Design Basis Conditions" was issued on September 30, 1996. GL 96-06 requested licensees to determine if containment air cooler cooling water systems are susceptible to either waterhammer or two-phase flow conditions during postulated accident conditions and to determine if piping systems that penetrate containment are susceptible to thermal expansion of fluid that could lead to overpressurization of piping. Duke Energy Carolinas (Duke) responded to the GL 96-06 in submittals to the NRC dated October 29, 1996, January 28, 1997, April 15, 1997, June 30,1997, August 1, 1997, May 28, 1998, September 22,1998, December 17, 1998, September 30, 2002, March 24, 2003 and September 29, 2003.
In the September 30, 2002 letter, Duke indicated that although the required systems remained operable, certain code allowables associated with the piping and the present piping support/restraint system would be exceeded without implementation of modifications to reduce the magnitudes of waterhammers. The letter also provided the conceptual scope of the proposed modifications and indicated that the schedules to complete the additional modifications would be provided when the plans and schedule for the modifications were developed.
Duke originally planned to implement the design modifications described in Attachment 1 to the September 30, 2002 letter on the following schedule:
Unit End-of Cycle Outage No.
Approximate Date 3
22 Spring 2006 1
24 Spring 2008 2
23 Fall 2008
.AcY72 www. duke-energy. corn
US NRC Document Control Desk May 10, 2006 Page 2 However, during development and scoping for the modification addressing LPSW System drainage, Duke determined that NRC review and approval is necessary prior to implementation.
Due to the additional time necessary to support NRC review and approval, Unit 3's modification will not be implemented until End-of-Cycle Outage No. 23 currently scheduled for Fall, 2007.
Unit 1 and 2's modifications are still scheduled for each unit's respective outage in 2008.
Please address any questions to Reene' Gambrell at 864-885-3364.
Very truly yours, B. H. Hamilton, Site Vice President Oconee Nuclear Station cc:
Mr. W. D. Travers, Regional Administrator U. S. Nuclear Regulatory Commission, Region II Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303 Mr. L. Olshan, Project Manager Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 0-14 H25 Washington, D.C. 20555 Mr. M.C. Shannon Senior Resident Inspector Oconee Nuclear Site
US NRC Document Control Desk May 10, 2006 Page 3 bcc:
Lisa F. Vaughn Graham Davenport C. Jeff Thomas - MNS Randy D. Hart - CNS Robert L. Gill -NAID Reene V. Gambrell Timothy D. Brown Richard J. Freudenberger Steve D. Capps George K. Mc Aninch Elizabeth S. Durham Lenny J. Azzarello BWOG Tech Spec Committee (5)
NSRB, EC05N ELL, EC050 ONS Document Management (OS-293)
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