ML091970595

Response to Request for Additional Information, License Amendment Request, Measurement Uncertainty Recapture Power Uprate

ML091970595
Person / Time
Site:	North Anna
Issue date:	07/16/2009
From:	Matthews W Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
09-412A, NLOS/ETS R0
Download: ML091970595 (3)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 July 16, 2009 U.S. Nuclear Regulatory Commission Serial No. 09-412A Attention: Document Control Desk NLOS/ETS RO Washington, D.C. 20555 Docket Nos. 50-338 50-339 License Nos. NPF-4 NPF-7 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)

NORTH ANNA POWER STATION UNITS 1 AND 2 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION LICENSE AMENDMENT REQUEST MEASUREMENT UNCERTAINTY RECAPTURE POWER UPRATE In a letter dated March 26, 2009 (Serial No.09-033), Dominion requested amendments to Operating Licenses NPF-4 and NPF-7 for North Anna Power Station Units 1 and 2, respectively. This measurement uncertainty recapture (MUR) power uprate License Amendment Request (LAR) would increase each unit's authorized core power level from 2893 megawatts thermal (MWt) to 2940 MWt, and make changes to Technical Specifications as necessary to support operation at the uprated power level. In a July 8,2009 letter (Serial No.09-412), Dominion responded to the NRC staff's request for additional information (RAI).

In a July 10,2009 phone call, the NRC staff and Dominion discussed RAI question eleven, which pertained to the impact of the MUR on grid stability. During the call, the NRC requested additional information regarding the actual value of the generator outputs used in the grid stability studies. The following information is provided to address the NRC request.

In the LAR and the follow-up response to the RAI, Dominion indicated that the gross generator outputs after the MUR are 980.5 MWe for Unit 1, and 972.9 MWe for Unit 2.

Gross generator output values are used in grid stability analyses.

As part of the capacity uprate projects, Dominion submitted new requests with PJM for authority to dispatch additional output, and these requests were assigned four submittal or queue numbers by PJM. Queue numbers S108 and S109 address an additional 20 MWe per unit for North Anna Units 1 and 2, respectively, for the MUR. Queues S11 0 and S112 were submitted for North Anna Units 2 and 1, respectively, to address an additional 65 MWe output per unit due to planned efficiency improvements from turbine replacements.

As part of the system impact studies (SIS), transient stability analyses were performed by PJM and provide the basis for the interconnect service agreement (ISA) Dominion has with PJM. These SIS documents also considered the associated gross generator outputs of 1075 MWe (Queue S112 for North Anna Unit 1) and 1068 MWe (Queue S11 0 for North Anna Unit 2). Based on PJM's approval of these submittals, Dominion now has a new ISA with PJM.

Serial No. 09-412A Docket Nos. 50-338/339 Page 2 of 3 In the new ISA, PJM also refers to the term maximum facility output (MFO). MFO represents the output that could be available to the grid, but is slightly different from Net Generation (gross generator output minus station service loads), since PJM averages three years of summer output data to arrive at an MFO value. Under the active ISA, the current MFO values are 945 MWe for Unit 1 and 938 MWe for Unit 2, which were the values discussed in the response to RAI question eleven. Under the new ISA for MUR and turbine replacement, the MFO values have increased to 1009.3 MWe and 993.7 MWe for Units 1 and 2, respectively.

The system impact study and the interconnect service agreement are available on the PJM website and are identified under the Queue numbers.

The information provided in this letter does not affect the conclusion of the significant hazards consideration discussion provided in Dominion letter dated March 26, 2009 (Serial No.09-033).

If you have any questions or require additional information, please contact Mr. Thomas Shaub at (804) 273-2763.

Sincerely, cu~~

William R. Matthews Senior Vice President - Nuclear Operations Commitments made in this letter: None 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.

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Acknowledged before me this , 2009.

My Commission ExPiresJY\a .3 lid. 0 )Q0. "U

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Notary Public VICKI L. HULL NotarY PWIIO commonwealth of commllll-

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Serial No. 09-412A Docket Nos. 50-338/339 Page 3 of 3 cc: U.S. Nuclear Regulatory Commission Region II Regional Administrator 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 Ms. D. N. Wright NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North MaiI 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