ML12300A418
| ML12300A418 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/25/2012 |
| From: | Gillespie T Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML12300A418 (4) | |
Text
F.
T. PRESTON GILLESPIE, JR.
Duke Vice President Energy.
Oconee Nuclear Station Duke Energy ONO VP / 7800 Rochester Hwy.
Seneca, SC 29672 D5/.-0-/3. *,.-;/.I October 25, 2012 864-873-4208 fax T. Gillespie@duke-energy. corn U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
Subject:
Duke Energy Carolinas, LLC (Duke Energy)
Oconee Nuclear Station, Unit 2 Docket Numbers 50-270 2011 Unit 2 End of Cycle (EOC) 25 Request for Additional Information (RAI) Response On February 29, 2012, Duke Energy submitted information summarizing the results of the 2011 Steam Generator (SG) Tube Inservice Inspections performed during the Oconee Nuclear Station (ONS) Unit 2 EOC-25 Refueling Outage (ADAMS Accession No. ML12066A243).
On September 11, 2012, the NRC Staff electronically requested additional information regarding this SG report. The enclosure provided in this submittal contains Duke Energy's response to the RAI.
This submittal document contains no regulatory commitments.
If you have any questions or require additional information, please contact Corey Gray at (864) 873-6325.
Sincerely, T. Preston Gillespie Jr.,
Site Vice President Enclosure www. duke-energy. com
U. S. Nuclear Regulatory Commission October 25, 2012 Page 2 xc (w/enclosure):
Victor McCree Region II Administrator U. S. Nuclear Regulatory Commission Marquis One Tower 245 Peachtree Center Ave., NE, Suite 1200 Atlanta, GA 30303-1257 John Boska Project Manager (by electronic mail only)
U. S. Nuclear Regulatory Commission One White Flint North, M/S O-8G9A 11555 Rockville Pike Rockville, MD 20852-2746 cc: (w/o enclosure)
NRC Senior Resident Inspector Oconee Nuclear Station Susan Jenkins Section Manager Division of Waste Management Bureau of Land and Waste Management SC Dept. of Health & Environmental Control 2600 Bull St.
Columbia, SC 29201
Duke Energy Response to Request for Additional Information on Steam Generator Tube Inspection Report, ME8435
- 1. Please clarify the results of your steam generator tube plug inspections.
Duke Response All plugs were visually inspected and no abnormal conditions were detected
- 2. Please clarify which tubes were plugged.
Duke response The table below contains the tubes that were repaired SteamSemRow Tube Generator A
75 1
A 78 1
A 79 1
A 73 2
A 75 3
A 98 125 A
75 131 A
76 131 A
77 131 A
77 132 B
64 5
B 93 6
B 99 6
B 68 10 B
72 10 B
123 97
- 3. Please provide the effective full power years that the steam generators have operated for the last several outages Duke Response Below is listed the EFPY for each refueling outage since replacement EOC Date EFPY EOC 20 March 2004 Replacement EOC 21 October 2005 1.31 EOC 22 April 2007 1.37 EOC 23 October 2008 1.38 EOC 24 April 2010 1.36 EOC 25 October 2011 1.37
- 4. In your condition monitoring assessment, you assess structural integrity against a limit associated with burst at three times the normal operating differential pressure. Please confirm that this limit is more limiting than the limit associated with a large break loss of coolant accident for both single and multiple sided wear indications.
Duke response Yes, the limit associated with burst at three times the normal operating differential pressure is more limiting than the limit associated with a large break loss of coolant accident for both single and multiple sided wear indications.