ML032810326
| ML032810326 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/29/2003 |
| From: | Rosalyn Jones Duke Power Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GL-96-006 | |
| Download: ML032810326 (2) | |
Text
P uke R.
A.
JONES Power.
Vice President A Duke Energy Company Duke Power 29672 / Oconee Nuclear Site 7800 Rochester Highway Seneca, SC 29672 864 885 3158 864 885 3564 fax September 29, 2003 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555
Subject:
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 Corporation (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 and March 24,2003.
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 mplementation 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 currently plans 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 In addition, Duke continues to develop more detailed thermal-hydraulic analyses to ensure final resolution of the waterhammer concems.
4 0W www. duke-energy. corn
US NRC Document Control Desk September 29, 2003 Page 2 Please address any questions to Robert Douglas at 864-885-3073.
Very t rs es, Site Vice President Oconee Nuclear Station cc:
Mr. L. A. Reyes, 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