ML062000123
| ML062000123 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/11/2006 |
| From: | Stephen Monarque NRC/NRR/ADRO/DORL/LPLII-1 |
| To: | Christian D Virginia Electric & Power Co (VEPCO) |
| Monarque, S R, NRR/DORL, 415-1544 | |
| References | |
| TAC MD0266 | |
| Download: ML062000123 (4) | |
Text
July 11, 2006 Mr. David A. Christian Senior Vice President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
NORTH ANNA POWER STATION, UNIT NO. 2 (NORTH ANNA 2), REVIEW OF STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT FOR THE FALL 2005 REFUELING OUTAGE (TAC NO. MD0266)
Dear Mr. Christian:
By letters dated October 21, 2005, and February 28, 2006, Virginia Electric and Power Company (VEPCO) submitted reports summarizing the steam generator (SG) tube inspections performed during the fall 2005 refueling outage at North Anna 2.
The Nuclear Regulatory Commission (NRC) staffs review of VEPCOs SG tube inspection report is enclosed. Based on its review, the NRC staff has concluded that VEPCO has provided the information required by their technical specifications for North Anna 2. The NRC staffs review did not identify any new technical issues that warrant follow-up action.
Sincerely,
/RA/
Stephen Monarque, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-339
Enclosure:
Safety Evaluation cc w/encl: See next page
July 11, 2006 Mr. David A. Christian Senior Vice President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
NORTH ANNA POWER STATION, UNIT NO. 2 (NORTH ANNA 2), REVIEW OF STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT FOR THE FALL 2005 REFUELING OUTAGE (TAC NO. MD0266)
Dear Mr. Christian:
By letters dated October 21, 2005, and February 28, 2006, Virginia Electric and Power Company (VEPCO) submitted reports summarizing the steam generator (SG) tube inspections performed during the fall 2005 refueling outage at North Anna 2.
The Nuclear Regulatory Commission (NRC) staffs review of VEPCOs SG tube inspection report is enclosed. Based on its review, the NRC staff has concluded that VEPCO has provided the information required by their technical specifications for North Anna 2. The NRC staffs review did not identify any new technical issues that warrant follow-up action.
Sincerely,
/RA/
Stephen Monarque, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-339
Enclosure:
Safety Evaluation cc w/encl: See next page DISTRIBUTION:
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Adams Accession No. ML062000123
- input by memo dated OFFICE NRR/LPL2-1/PM NRR/LPD2-1/LA NRR/CSGB/ABC NRR/LPL2-1/BC NAME SMonarque MOBrien TBloomer*
EMarinos DATE 73/2006 7/6/2006 06/01/2006 7/11/2006 OFFICIAL RECORD COPY
EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION REGARDING THE FALL 2005 REFUELING OUTAGE STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION, UNIT NO. 2 DOCKET NO. 50-339 By letters dated October 21, 2005, and February 28, 2006, Virginia Electric and Power Company (the licensee) submitted reports summarizing the steam generator (SG) tube inspections performed during the fall 2005 refueling outage for SG-B at North Anna Power Station, Unit No. 2 (North Anna 2). These reports were submitted in accordance with Technical Specification (TS) Sections 5.6.7.a, 5.6.7.b, and 5.5.8. A summary of the Nuclear Regulatory Commission (NRC) staffs evaluation of the fall 2005 refueling outage SG tube inspection results is provided below.
North Anna 2 has three replacement Westinghouse Model 54F SGs that are designated A, B, and C. Each SG contains 3,592 thermally treated Inconel 690 tubes, which have an outside diameter of 0.875 inch and a wall thickness of 0.050 inch. The tubes have been hydraulically expanded into the tubesheet and the stainless steel Type 405 tube support plates contain broached quatrefoil holes. These SGs began operation in 1995.
Only SG-B was inspected during the fall 2005 refueling outage. The last inspection of SG-B took place during the fall 1999 refueling outage. The licensee inspected 3592 tubes (100 percent of tubes in SG-B), full length (tube end cold to tube end hot), using a bobbin probe. A +Point' probe was used to inspect approximately 20 percent (719 tubes) of the tubes in the hot-leg expansion transition region and 100 percent (98 tubes) of the tubes in the U-bend region in Row 1 (top hot leg support to top cold leg support).
The licensee provided the scope, extent, methods, and results of its SG tube inspections in the documents referenced above. Based on a review of the information provided, the NRC staff concludes that the licensee provided the information required by the TSs. In addition, the NRC staff concludes that there are no technical issues that warrant follow-up action at this time since the inspections appear to be consistent with the objective of detecting potential tube degradation and the inspection results appear to be consistent with industry operating experience at similarly designed and operated units.
Principal Contributor: M. Vaaler Date: July 11, 2006 North Anna Power Station, Units 1 & 2 cc:
Mr. C. Lee Lintecum County Administrator Louisa County Post Office Box 160 Louisa, Virginia 23093 Ms. Lillian M. Cuoco, Esq.
Senior Counsel Dominion Resources Services, Inc.
Building 475, 5 th floor Rope Ferry Road Waterford, Connecticut 06385 Dr. W. T. Lough Virginia State Corporation Commission Division of Energy Regulation Post Office Box 1197 Richmond, Virginia 23218 Old Dominion Electric Cooperative 4201 Dominion Blvd.
Glen Allen, Virginia 23060 Mr. Chris L. Funderburk, Director Nuclear Licensing & Operations Support Dominion Resources Services, Inc.
Innsbrook Technical Center 5000 Dominion Blvd.
Glen Allen, Virginia 23060-6711 Office of the Attorney General Commonwealth of Virginia 900 East Main Street Richmond, Virginia 23219 Senior Resident Inspector North Anna Power Station U. S. Nuclear Regulatory Commission 1024 Haley Drive Mineral, Virginia 23117 Mr. Jack M. Davis Site Vice President North Anna Power Station Virginia Electric and Power Company Post Office Box 402 Mineral, Virginia 23117-0402 Dr. Robert B. Stroube, MD, MPH State Health Commissioner Office of the Commissioner Virginia Department of Health Post Office Box 2448 Richmond, Virginia 23218