ML100541591
| ML100541591 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 02/09/2010 |
| From: | Repko R Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML100541591 (2) | |
Text
REGIS T. REPKO Vice President PefwEnergye McGuire Nuclear Station Duke Energy MG01VP / 12700 Hagers Ferry Rd.
Huntersville, NC 28078 980-875-4111 980-875-4809 fax regis. repko@duke-energy. corn February 9, 2010 United States Nuclear Regulatory Commission Washington, DC 20555-0001 ATTENTION:
Document Control Desk
Subject:
Duke Energy Carolinas, LLC (Duke)
McGuire Nuclear Station Unit 1 Docket No. 50-369 Update on Corrective Actions to Resolve the Auxiliary Feedwater System Air Entrainment Condition Reference 1:
Duke letter to NRC dated June 28, 2007 The purpose of this letter is to provide an update on Duke's plans for resolving an Operable But Degraded Non-conforming (OBDN) condition which existed on the Auxiliary Feedwater (CA) System at McGuire Nuclear Station (McGuire). As communicated in Reference 1, an additional air entrainment scenario was identified at the Unit 1 Standby Shutdown System (SSS) CA supply connection via valves1CA-161C and 1CA-162C. Unit 2 is not susceptible to this air entrainment scenario. This OBDN condition is documented in the McGuire Corrective Action Program as M-06-02284.
Also communicated in Reference 1, McGuire would provide a schedule for implementing the corrective actions to resolve the CA system air entrainment OBDN condition. The plan and schedule for resolving this OBDN condition follows:
To resolve the air entrainment issue, a modification was performed to delete the automatic open feature for valves 1CA-161C and 1CA-162C such that these become manually operated valves. The initial CA water source for SSS events will be provided by the CA Storage Tank. Manual alignment of the Condenser Circulating Water system via valves 1CA-161C and 1CA-162C can be performed after the water source has been confirmed to be water solid. The modifications on valves 1CA-161C and 1CA-162C were performed on February 5, 2010.
This letter completes McGuire's commitment to update the NRC on the CA system air entrainment conditions:
www.duke-energy. corn
U.S. Regulatory Commission February 9, 2010 Page 2 Please contact Lee Hentz at 980-875-4187 or Jim Mead at 980-875-4129 if any questions arise.
Sincerely, Regis T. Repko xc:
L. A. Reyes Administrator, Region II U.S. Nuclear Regulatory Commission Sam Nunn Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, GA 30303 J. H. Thompson Project Manager (McGuire)
U.S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852-2738 Mail Stop 0-8 G9A J. B. Brady Senior Resident Inspector U. S. Nuclear Regulatory Commission McGuire Nuclear Station
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