ML020160066
| ML020160066 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 01/04/2002 |
| From: | Christian D Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 01-721 | |
| Download: ML020160066 (9) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 January 4, 2002 United States Nuclear Regulatory Commission Serial No.:
01-721 Attention: Document Control Desk LR/MWH RO Washington, DC 20555-0001 Docket Nos.:
50-280/281 50-338/339 License Nos.: DPR-32/37 NPF-4/7 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
SURRY AND NORTH ANNA POWER STATIONS UNITS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION LICENSE RENEWAL APPLICATIONS In a November 14, 2001 letter, the NRC requested additional information regarding the license renewal applications (LRAs) for Surry and North Anna Power Stations. The attachment to this letter contains the responses to the Requests for Additional Information (RAIs) associated with Sections 2.3.1 and 2.3.2 of the LRA.
Should you have any questions regarding this submittal, please contact Mr. J. E.
Wroniewicz at (804) 273-2186.
Very truly yours, David A. Christian Senior Vice President - Nuclear Operations and Chief Nuclear Officer Attachment Commitments made in this letter: None
Serial No.: 01-721 SPS/NAPS LR - Response to RAI cc page 1 of 4 cc:
U. S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW Suite 23T85 Atlanta, GA 30303-8931 Mr. M. J. Morgan NRC Senior Resident Inspector North Anna Power Station Mr. R. A. Musser NRC Senior Resident Inspector Surry Power Station Mr. J. E. Reasor, Jr.
Old Dominion Electric Cooperative Innsbrook Corporate Center 4201 Dominion Blvd.
Suite 300 Glen Allen, VA 23060 Ms. Ellie Irons, EIR Program Manager Virginia Dept. of Environmental Quality 629 East Main St., 6 th Fl Richmond, VA 23219 Mr. David Paylor, Program Coordinator Virginia Dept. of Environmental Quality P.O. Box 10009 Richmond, VA 23240-0009 Mr. Joe Hassell, Environmental Manager Virginia Dept. of Environmental Quality Water Division P.O. Box 10009 Richmond, VA 23240-0009 Mr. Frank Daniel, Regional Director Virginia Dept. of Environmental Quality Tidewater Regional Office 5636 Southern Blvd.
Serial No.: 01-721 SPS/NAPS LR - Response to RAI cc page 2 of 4 Mr. Gregory Clayton, Regional Director Virginia Dept. of Environmental Quality Northern Virginia Regional Office 13901 Crown Ct.
Woodbridge, VA 22193 Mr. Frank Fulgham, Program Manager Virginia Dept. of Agriculture & Consumer Services Office of Plant & Pest Services 1100 Bank St.
Richmond, VA 23219 Mr. David Brickley, Agency Director Virginia Dept. of Conservation & Recreation 203 Governor St.
Richmond, VA 23219 Mr. William Woodfin, Director Virginia Dept. of Game & Inland Fisheries 4010 West Broad St.
Richmond, VA 23230 Mr. Robert Hicks, Director Virginia Dept. of Health Office of Environmental Health Services 1500 East Main St., Room 115 Richmond, VA 23219 Ms. Kathleen S. Kilpatrick, Director Virginia Dept. of Historic Resources State Historic Preservation Office 2801 Kensington Ave.
Richmond, VA 23221 Dr. Ethel Eaton, Archeologist Senior Virginia Dept. of Historic Resources State Historic Preservation Office 2801 Kensington Ave.
Richmond, VA 23221
Serial No.: 01-721 SPS/NAPS LR - Response to RAI cc page 3 of 4 Mr. Robert W. Grabb, Assistant Commissioner Virginia Marine Resources Commission 2600 Washington Ave.
Newport News, VA 23607 Dr. John Olney, Associate Professor Virginia Institute of Marine Science School of Marine Science Gloucester Point, VA 23062 Mr. John Simkins Virginia Dept. of Transportation Environmental Division 1401 East Broad St.
Richmond, VA 23219 Mr. Robert Burnley Virginia Economic Development Partnership 901 East Byrd St.
Richmond, VA 23219 Mr. William F. Stephens, Director Virginia State Corporation Commission Division of Energy Regulation 1300 East Main St., 4th Fl., Tyler Bldg.
Richmond, VA 23219 Mr. Michael Cline, State Coordinator Commonwealth of Virginia Department of Emergency Management 10501 Trade Rd.
Richmond, VA 23236-3713 Mr. Terry Lewis, County Administrator P.O. Box 65 Surry, VA 23883 Mr. Lee Lintecum Louisa County Administrator P.O. Box 160 Louisa, VA 23093
Serial No.: 01-721 SPS/NAPS LR - Response to RAI cc page 4 of 4 Mr. Douglas C. Walker Acting Spotsylvania County Administrator P.O. Box 99 Spotsylvania, VA 22553 Ms. Brenda G. Bailey, County Administrator P.O. Box 11 Orange, VA 22960 Chairman Reeva Tilley Virginia Council on Indians P.O. Box 1475 Richmond, VA 23218 Mr. Don Lillywhite, Director Economics Information Services Virginia Employment Commission State Data Center 703 East Main St., Room 213 Richmond, VA 23219 Mr. Alan Zoellner Government Information Department Swem Library College of William and Mary Landrum Dr.
P.O. Box 8794 Williamsburg, VA 23187-8794 Mr. Walter Newsome Government Information Resources Alderman Library University of Virginia 160 McCormick Rd.
P.O. Box 400154 Charlottesville, VA 22904-4154
SN: 01-721 Docket Nos.: 50-280/281 50-338/339
Subject:
License Renewal RAI COMMONWEALTH OF VIRGINIA COUNTY OF HENRICO
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The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by David A. Christian who is Senior Vice President and Chief Nuclear Officer of Virginia Electric and Power Company. He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that Company, and that the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this 4th day of January, 2002.
My Commission Expires: March 31, 2004.
otarý Public (SEAL)
Docket Nos. 50-280/281 50-338/339 Serial No.: 01-721 Attachment Page 1 of 3 Attachment License Renewal - Response to RAI Serial No.01-721 Response to Request for Additional Information Dated November 14, 2001 Surry and North Anna Power Stations, Units I and 2 License Renewal Applications Sections 2.3.1 and 2.3.2 Virginia Electric and Power Company (Dominion)
Docket Nos. 50-280/281 50-338/339 Serial No.: 01 -721 Attachment Page 2 of 3 RAI 2.3.1-1:
In both LRAs, Section 2.3.1, the applicant states that two concentric, hollow, metallic 0 rings between the closure head flange and the reactor vessel flange form an inner and outer seal. Furthermore, it was stated in the UFSAR that leakage through the reactor vessel head flange will leak between the double 0-ring seal to the leakoff provided.
Leakage into this leakoff path will cause high temperature in this line, which will actuate an alarm in the control room. On the bases of the staffs experience with license renewal, the staff has generally concluded that the inner 0-ring, the leakoff lines, and the outer 0-ring all support the reactor vessel closure head flange pressure boundary.
Although in select cases the staff has accepted a site-specific technical justification, in general, the leakoff lines require an aging management review. Please provide a site specific technical justification for both NAS and SPS as to why aging management is not required, or perform an aging management review for these components.
Dominion Response:
As discussed in the UFSAR, the reactor vessel closure head and shell flanges are sealed by inner and outer hollow metallic o-rings.
Any leakage through this seal arrangement is directed to the leakage detection system through 1/4" holes in the vessel flange. The leakage detection system consists of 1" tubes connected to the vessel flange that reduce to 3/8" tubing a short distance from the flange. These leak detection lines do not provide a license renewal intended function. Leakage flow past the inner o-ring is limited in the event of failure since the 1/4" diameter hole in the flange is smaller than the inside diameter of the leak detection line. Additionally, the potential flowrate through the 1/4" diameter hole in the flange is within the normal make-up capability of the charging system.
Since the reactor vessel flange seal leakage detection function of these components does not meet the criteria of 10CFR54.4(a) as an intended function, the leak detection components are not within the scope of license renewal.
The license renewal drawings referenced in the application (11448-LRM-086A, sh. 1 and 11548-LRM-086A, sh. 1 for Surry and 11715-LRM-093A, sh. 1 and 12050-LRM 093A, sh. 1 for North Anna) incorrectly indicate that leak detection components are within the scope of license renewal. As described above, these components are not within scope. The affected license renewal drawings will be revised consistent with this conclusion.
Docket Nos. 50-280/281 50-338/339 Serial No.: 01-721 Attachment Page 3 of 3 RAI 2.3.2.4-1:
It was stated in the UFSAR that a modified design incorporating vortex suppressing devices was developed so that the containment sump will be free of any harmful vortices for any postulated operating conditions. The modifications made to the sump involved the installation of two layers of floor grating in the sump and the installation of perforated vortex breakers inside the cylindrical screens (Sections 3A.79 and 6.2.2.4.3 of the North Anna UFSAR). These components do not appear to have been described in the LRA, and are not included within the scope of license renewal. The staff requests that the applicant provide a technical justification for its exclusion, or that the applicant submit an aging management review for these components. In addition, if similar components (screens/vortex suppressors) are employed inside tanks at pump suction lines, then the applicant should also identify those components, and submit an AMR for those components.
Dominion Response:
The perforated vortex breakers were considered an integral part of the cylindrical sump screens since they are constructed of the same material and exposed to the same environment as the sump screens. Applicable aging effects for the cylindrical sump screens (including the perforated vortex breakers) are managed by the Infrequently Accessed Area Inspection Activity as indicated in Table 3.2-3 of the license renewal application.
The two layers of floor grating installed in the sump function as vortex suppressors and will be included in the scope of License Renewal.
These vortex suppressors are subject to loss of material and this aging effect will be managed by the Infrequently Accessed Area Inspection Activity.
A review of Surry and North Anna tanks has concluded that there are no other vortex suppression devices installed at pump suction lines that should be included within the scope of license renewal.