ML073190187
| ML073190187 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/21/2007 |
| From: | John Hughey NRC/NRR/ADRO/DORL/LPLI-2 |
| To: | Christian D Virginia Electric & Power Co (VEPCO) |
| Sanders, Carleen, NRR/DORL 415-1603 | |
| References | |
| TAC MD3450 | |
| Download: ML073190187 (5) | |
Text
November 21, 2007 Mr. David A. Christian President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
MILLSTONE POWER STATION, UNIT NO. 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING STEAM GENERATOR TUBE INSPECTION SPECIAL REPORT (TAC NO. MD3450)
Dear Mr. Christian:
By letter to the Nuclear Regulatory Commission (NRC) dated October 2, 2006, Dominion Nuclear Connecticut, Inc. (DNC) submitted the results of the steam generator tube inspection activities conducted during the tenth refueling outage. The NRC staff has reviewed the report submitted by DNC and has identified a need for additional information as set forth in the enclosure.
On November 19, 2007, William Bartron, from your staff indicated that DNC understands the issues and plans to submit a response by December 28, 2007.
If you have any questions please contact Carleen Sanders at 301-415-1603.
Sincerely,
/ra/
John D. Hughey, Project Manager Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-423
Enclosure:
As stated cc w/encl: See next page
November 21, 2007 Mr. David A. Christian President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
MILLSTONE POWER STATION, UNIT NO. 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING STEAM GENERATOR TUBE INSPECTION SPECIAL REPORT (TAC NO. MD3450)
Dear Mr. Christian:
By letter to the Nuclear Regulatory Commission (NRC) dated October 2, 2006, Dominion Nuclear Connecticut, Inc. (DNC) submitted the results of the steam generator tube inspection activities conducted during the tenth refueling outage. The NRC staff has reviewed the report submitted by DNC and has identified a need for additional information as set forth in the enclosure.
On November 19, 2007, William Bartron, from your staff indicated that DNC understands the issues and plans to submit a response by December 28, 2007.
If you have any questions please contact Carleen Sanders at 301-415-1603.
Sincerely,
/ra/
John D. Hughey, Project Manager Plant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-423
Enclosure:
As stated cc w/encl: See next page DISTRIBUTION:
PUBLIC LPL1-2 R/F RidsNrrDorlLpl1-2 RidsNrrPMJHughey RidsNrrLAABaxter RidsRgn1MailCenter RidsAcrsAcnwMailCenter RidsOgcRp AHiser, NRR AJohnson, NRR KKarwoski, NRR ADAMS Accession No. ML073190187
- By Memorandum dated OFFICE LPL1-2/GE LPL1-2/PM LPL1-2/LA DCI/CSGB/BC LPL1-2/BC NAME CSanders JHughey ABaxter AHiser*
HChernoff DATE 11/19/2007 11/19/2007 11/19/2007 10/11/2007 11/21/2007 Official Record Cop
Enclosure REQUEST FOR ADDITIONAL INFORMATION 2005 STEAM GENERATOR TUBE INSPECTIONS MILLSTONE POWER STATION UNIT 3 DOCKET NUMBER 50-423
- 1.
Of all the new anti-vibration bar wear indications found in steam generator (SG) A and C, what was the maximum depth of wear recorded?
- 2.
Dominion Nuclear Connecticut, Inc. (DNC) indicated that inspections were performed at six possible loose part locations during the outage. Please provide the scope and results of any other secondary side inspections (including foreign object search and retrieval) performed during the 2005 outage.
- 3.
DNC indicated that 379 of the u-bends in rows one and two were inspected this outage.
Please discuss the last time the remaining u-bends in rows one and two were inspected with a rotating probe. Please discuss the nature of the restrictions observed in the row one and row two tubes.
- 4.
DNC indicated that 1054 over-expansions were inspected this outage. Of the total population of over-expansions within the tubesheet, what percentage does the 1054 represent? What was the criterion used to determine which over-expansions were inspected (i.e., was it only the over-expansions whose voltage exceeded 28 volts)?
Were the 1054 over-expansions contained within the 207 tubes identified in Table 1 of your October 2, 2006, letter? Given the requirements in place at the time of the inspection, what was the basis for only sampling over-expansions in the top 16 inches of the tubesheet? Given recent operating experience, that cracking can occur in and near the tube-to-tubesheet weld and the tack expansion, please discuss why no inspections were performed in this region.
- 5.
Please clarify the scope of the dent and ding inspections. In particular, were all dents and dings greater than or equal to five volts inspected with a rotating probe? If not, please clarify when the last time was that dents and dings greater than five volts were inspected with a rotating probe.
- 6.
Table 2 indicated that tubes in SG A at row 29 column 109 (R29C109) and R29C110 were visually inspected for loose parts. Both the map of SG A and the associated table in Attachment 3 indicate R29C112 as having been inspected and not R29C109 and R29C110. Please clarify.
- 7.
Please clarify the following inspection categories from Table 1: U-bends - Additional Scope (tubes) and U-bend.Special Interest - Diagnostic Exams and from Previous History (tubes).
- 8.
Please clarify the nature of the single volumetric indications (SVIs) that were sized and left in service. If any of the indications are related to loose parts, please clarify whether
a loose part or potential loose part is still at the affected location. If so, discuss the basis for leaving the tube(s) in service. In addition, please provide the depth estimate of all SVIs that were left in service. Please discuss whether any of these indications have changed in size since the last inspection.
Millstone Power Station, Unit No. 3 cc:
Lillilan M. Cuoco, Esquire Senior Counsel Dominion Resources Services, Inc.
Building 475, 5th Floor Rope Ferry Road Waterford, CT 06385 Edward L. Wilds, Jr., Ph.D.
Director, Division of Radiation Department of Environmental Protection 79 Elm Street Hartford, CT 06106-5127 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 First Selectmen Town of Waterford 15 Rope Ferry Road Waterford, CT 06385 Mr. J. W. "Bill" Sheehan Co-Chair NEAC 19 Laurel Crest Drive Waterford, CT 06385 Mr. Evan W. Woollacott Co-Chair Nuclear Energy Advisory Council 128 Terry's Plain Road Simsbury, CT 06070 Senior Resident Inspector Millstone Power Station c/o U.S. Nuclear Regulatory Commission P. O. Box 513 Niantic, CT 06357 Ms. Nancy Burton 147 Cross Highway Redding Ridge, CT 00870 Mr. Joseph Roy, Director of Operations Massachusetts Municipal Wholesale Electric Company Moody Street P.O. Box 426 Ludlow, MA 01056 Mr. J. Alan Price Site Vice President Dominion Nuclear Connecticut, Inc.
Building 475, 5th Floor Rope Ferry Road Waterford, CT 06385 Mr. Chris Funderburk Director, Nuclear Licensing and Operations Support Dominion Resources Services, Inc.
5000 Dominion Boulevard Glen Allen, VA 23060-6711 Mr. William D. Bartron Licensing Supervisor Dominion Nuclear Connecticut, Inc.
Building 475, 5th Floor Rope Ferry Road Waterford, CT 06385