ML083220479
| ML083220479 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 11/17/2008 |
| From: | Matthews W Dominion, Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 08-0670 | |
| Download: ML083220479 (3) | |
Text
10 CFR 50.90 VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 November 17, 2008 u.s. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Serial No.
NL&OS/ETS Docket Nos.
License Nos.
08-0670 Ro 50-338/339 50-280/281 NPF-4/7 DPR-32/37 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNITS 1 AND 2 SURRY POWER STATION UNITS 1 AND 2 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION FOR PROPOSED LICENSE AMENDMENT REQUEST DELETION OF MAIN CONTROL ROOM/EMERGENCY SWITCHGEAR ROOM BOTTLED AIR SYSTEM FROM TECHNICAL SPECIFICATIONS In a letter dated March 19, 2008 (Serial No. 08-0080), Dominion requested amendments, in the form of changes to the Technical Specifications to Facility Operating License Numbers NPF-4 and NPF-7, for North Anna Power Station Units 1 and 2, respectively.
The proposed amendment would delete the Control Room/Emergency Switchgear Room (MCR/ESGR) Bottled Air System from Technical Specifications.
In an October 29, 2008 telephone conference call, the NRC staff requested additional information regarding adequacy of breathing air for the occupants in the MCR/ESGR envelope during the first hour of a Design Basis Accident (DBA).
Removal of the bottled air system will have no adverse effects on the personnel in the MCR/ESGR envelope. A conservative estimate indicates that, with an airtight MCR/ESGR envelope and no bottled air available, MCR/ESGR environmental conditions at one hour after a DBA would remain within normal, expected ranges, specifically for carbon dioxide and oxygen concentration.
It was estimated that the oxygen concentration would be Insignificantly affected during this time frame.
Carbon dioxide concentration would Increase, but remain several times less than the NIOSH/OSHA time weighted average limit.
Ventilation effectiveness has been observed for about 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during tracer gas testing at both stations, at which time the MCR/ESGR envelope was isolated with no bottled air. No adverse effects to the personnel that were within the MCR/ESGR envelope were observed.
Actual MCR/ESGR envelope inleakage measured in the DBA alignment was at least 100 cfm.
Surry Power Station has requested a similar license amendment to delete the MCR/ESGR Bottled Air System from Technical Specifications in a letter dated October 9, 2008 (Serial No. 08-0411).
Due to the similarity of design and operation of the Surry and North Anna MCR/ESGRs, the NRC's request for additional information is applicable to the Surry
Serial No. 08-0670 Docket Nos. 50-338/339, 50-280/281 RAI-Bottled Air System Amendment Page 2 of 3 license amendment request as well.
Therefore, the information provided herein is provided as supplemental information on both the North Anna and Surry license amendment requests.
The information provided in this letter does not affect the conclusion of the significant hazards consideration discussion provided in Dominion letters dated March 19, 2008 (Serial No. 08-0080) and October 9, 2009 (Serial No. 08-0411) for North Anna and Surry, respectively.
If you have any questions or require additional information, please contact Mr. Thomas Shaub at (804) 273-2763.
Very truly yours, U//2q'~
William R. Matthews Senior Vice President - Nuclear Operations COMMONWEALTH OF VIRGINIA COUNTY OF HENRICO The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by William R. Matthews, who is Senior Vice President - Nuclear Operations, 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 th~S< '7 ~ay o~t'm6a./, 2008.
My Commission Exp;,es,,,I/h:j 31,,20/0.K. '. /
(//(£t X,2/;4L Notary Public VICII L. MULL Notary Public commonwealth of Virginia U0542 I My CommlIIIon ExpIres May 31. 2010
cc:
U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW Suite 23T85 Atlanta, Georgia 30303 Mr. J. E. Reasor, Jr.
Old Dominion Electric Cooperative Innsbrook Corporate Center 4201 Dominion Blvd.
Suite 300 Glen Allen, Virginia 23060 State Health Commissioner Virginia Department of Health James Madison Building - 7th floor 109 Governor Street Suite 730 Richmond, Virginia 23219 NRC Senior Resident Inspector North Anna Power Station NRC Senior Resident Inspector Surry Power Station Ms. D. N. Wright NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 0-8 H4A 11555 Rockville Pike Rockville, Maryland 20852 Mr. J. F. Stang, Jr.
NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 0-8 G9A 11555 Rockville Pike Rockville, Maryland 20852 Serial No. 08-0670 Docket Nos. 50-338/339, 50-280/281 RAI-Bottled Air System Amendment Page 3 of 3