ML110811012
| ML110811012 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 03/29/2011 |
| From: | Cotton K Plant Licensing Branch II |
| To: | Heacock D Virginia Electric & Power Co (VEPCO) |
| Cotton K, NRR/DORL, 301-415-1438 | |
| References | |
| TAC ME5689 | |
| Download: ML110811012 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001
~1arch 29, 2011 Mr. David A. Heacock President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center SOOO Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
SURRY POWER STATION, UNIT NO.2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING THE 2009 REFUELING OUTAGE STEAM GENERATOR TUBE INSPECTIONS FOR END OF CYCLE 22 (TAC NO.
MES689)
Dear Mr. Heacock:
By letter dated May 24, 2010, Virginia Electric and Power Company, the licensee, submitted information summarizing the results of the 2009 steam generator tube inspections at Surry Power Station, Unit 2.
The U.S. Nuclear Regulatory Commission staff has reviewed the information the licensee provided and determined that additional information is needed in order to complete the review.
The requested additional information is enclosed. Please respond within 30 days of the date of this letter.
If you have any questions, please feel free to contact me at 301-41S-1438.
Sincerely, Karen Cotton, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor licenSing Office of Nuclear Reactor Regulation Docket No. SO-281
Enclosure:
Request for Additional Information cc w/encl: Distribution via Listserv
REQUEST FOR ADDITIONAL INFORMATION SURRY POWER STATION, UNIT NO.2 2009 STEAM GENERATOR TUBE INSPECTIONS TAC NO. ME5689 DOCKET NO. 50-281 By letter dated May 24, 2010 (Agencywide Documents Access and Management System, Accession No. ML101530533), Virginia Electric and Power Company, the licensee, submitted information summarizing the results of the 2009 steam generator (SG) tube inspections at Surry Power Station, Unit No.2.
In order to complete the review, the U.S. Nuclear Regulatory Commission (NRC) staff requests the following information:
- 1. Please clarify the difference between an overexpansion and overroll.
- 2. With respect to tubes that may have potentially elevated residual stresses as a result of fabrication, please clarify the number of high row tubes (i.e., tubes in rows where the U-bends were not stress relieved following bending) in SG A that have this condition (either Tier 1 or Tier 2 tubes). It is the NRC staff's understanding that none of the low row tubes (i.e., tubes in rows where the U-bends were stress relieved) in either SGs A, B, or C have potentially elevated residual stresses (Le., no eddy current offset) as a result of fabrication and that there are 2 high row tubes in SG Band 14 high row tubes in SG C that have potentially elevated residual stresses (Le., 2 sigma tubes). Please confirm the NRC staff's understanding.
- 3. Please discuss the results of the secondary side inspections (other than foreign object search and retrieval) in SG C. Please discuss how the 2009 inspection results compare to the inspection results obtained in 2008 for this SG.
- 4. During a prior outage, corrosion degradation was observed in the channel head area and in an unplugged tube (which was subsequently replugged) in SG A. Please discuss whether these areas were inspected/monitored during the 2009 outage. If so, please discuss the results.
- 5. Based on a review of Tables 9 and 10, it appears that some tubes with no degradation were plugged since they had foreign objects present. Please identify these tubes (Le.,
tubes with loose part indications and no associated wear that were plugged) and the tubes that were plugged because they were not expanded in the tubesheet (NTE tubes).
Enclosure
March 29, 2011 Mr. David A. Heacock President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
SURRY POWER STATION, UNIT NO.2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING THE 2009 REFUELING OUTAGE STEAM GENERATOR TUBE INSPECTIONS FOR END OF CYCLE 22 (TAC NO.
ME5689)
Dear Mr. Heacock:
By letter dated May 24,2010, Virginia Electric and Power Company, the licensee, submitted information summarizing the results of the 2009 steam generator tube inspections at Surry Power Station, Unit 2.
The U.S. Nuclear Regulatory Commission staff has reviewed the information the licensee provided and determined that additional information is needed in order to complete the review.
The requested additional information is enclosed. Please respond within 30 days of the date of this letter.
If you have any questions, please feel free to contact me at 301-415-1438.
Sincerely, IRA!
Karen Cotton, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-281
Enclosure:
Request for Additional Information cc w/encl: Distribution via Listserv DISTRIBUTION:
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KCotton DATE 03129/11 03/2B/11 3110111 03/29/11 03/29/11 OFFICIAL RECORD COPY