ML16202A051

Response to Request for Additional Information Regarding Core Operating Limits Report Cycle 25, Pattern Kty, Revision 1

ML16202A051
Person / Time
Site:	North Anna
Issue date:	07/14/2016
From:	Mark D. Sartain Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML16202A051 (5)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 July 14, 2016 10 CFR 50.90 U.S. Nuclear Regulatory Commission Serial No.16-274 Attention: Document Control Desk NRA/DEA R1 Washington, DC 20555 Docket No.: 50-339 License No.: NPF-7 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)

NORTH ANNA POWER STATION UNIT 2 RESPONSE TO NRC REQUEST FOR ADDITIONAL INFORMATION CORE OPERATING LIMITS REPORT CYCLE 25, PATTERN KTY, REVISION 1 On April 21, 2016, Dominion submitted letter Serial No.16-126, "Core Operating Limits Report North Anna 2 Cycle 25 Pattern KTY Revision 1," to the Nuclear Regulatory Commission (NRG) in accordance with Technical Specification 5.6.5.d.

In an email dated June 27, 2016, the Nuclear Regulatory Commission (NRG) transmitted a request for additional information (RAI) to Dominion related to the Core Operating Limits Report. Dominion agreed to respond to the RAI by July 27, 2016.

The attachment to this letter provides Dominion's response to the NRC's RAI.

Should you have any questions regarding this submittal, please contact Ms. Diane E. Aitken at (804) 273-2694.

Sincerely, Mark D. Sartain Vice President - Nuclear Engineering COMMONWEALTH OF VIRGINIA COUNTY OF HENRICO The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Mark D. Sartain, who is Vice President - Nuclear Engineering 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 /ij. ~ay of VU {11 , 2016.

My Commission Expires: 5 -3\-\B '

V1~l4. ~ .J\uoo Notary Public

Serial No.: 16-274 Docket No.: 50-339 Response to RAI - COLR N2C25 Page 2 of 2

Attachment:

Response to Request for Additional Information in Support of NRC Review of COLR Cycle 25 Pattern KTY Revision 1 for Cycle 25 Commitments made in this letter: None.

cc: U.S. Nuclear Regulatory Commission - Region II Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, GA 30303-1257 Dr. V. Sreenivas NRC Project Manager - North Anna U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 Ms. Karen Cotton-Gross NRC Project Manager U.S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector North Anna Power Station

Serial No.: 16-274 Docket No.: 50-339 ATTACHMENT RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION IN SUPPORT OF NRC REVIEW OF COLR CYCLE 25 PATTERN KTY REVISION 1 FOR CYCLE 25 Virginia Electric and Power Company (Dominion)

North Anna Power Station Unit 2

Serial No: 16-274 Docket Nos.: 50-339 Response to RAI - COLR N2C25 Attachment; Page 1 of 2 Response to Request for Additional Information in Support of NRC Review of COLR Cycle 25 Pattern KTY Revision 1 for Cycle 25 North Anna Power Station Unit 2 Generic Letter 88-16 provides guidance to modify Technical Specifications (TS) that have cycle-specific parameter limits using NRC approved methodology. The modifications, in part, were to allow these cycle-specific TS parameters to be relocated to licensee controlled Core Operating Limits Report (COLR) and to include a list of the TS parameters relocated to the COLR and their associated methodologies used to establish these TS parameters in the TS. The licensee has adopted Generic Letter 88-16 for use at North Anna Unit 2. Section 5.6.5 of the licensee's TS contains a list of many analytical methods used to develop COLR parameters while the COLR only lists a subset of these analytical methods.

RAI No.1 Please identify those specific analytical methods listed in the TS that were used in the development of COLR parameters for Cycle 25. If there are analytical methods that were not specifically used for Cycle 25, please provide a justification for maintaining them in the TS.

Dominion Response The two previous operating cycles, North Anna Unit 1 Cycles 23 and 24 and North Anna Unit 2 Cycles 23 and 24, had a mixed core configuration with both AREVA Advanced Mark-BW fuel and Westinghouse RFA-2 fuel. During these cycles, the Core Operating Limits Report (COLR) included both AREVA and Westinghouse analytical methods to determine core operating limits for each vendor's fuel product.

The current operating cycles, North Anna Unit 1 Cycle 25 (N1C25) and North Anna Unit 2 Cycle 25 (N2C25), are full cores of Westinghouse RFA-2 fuel. As such, the AREVA analytical methods are not in the cycle-specific COLR for either N1C25 or N2C25 since these core designs do not contain AREVA Advanced Mark-BW fuel. The specific analytical methods listed in the TS that were used in the development of COLR parameters for Unit 2 Cycle 25 (N2C25) are provided in the list of references of the N2C25 COLR Pattern KTY, Revision 1 submitted on April 21, 2016.

Although not used in the N2C25 COLR, Dominion maintains the AREVA methodologies in the TS list of COLR references as a contingency measure to support the loading of AREVA Advanced Mark-BW fuel into North Anna cores in the future, if required.

Currently, the AREVA Advanced-Mark BW fuel assemblies are still on Dominion's fuel re-use list to support core design pattern development during a redesign. In order to support potential emergent redesigns during an outage, it is necessary for Dominion to maintain the ability to reinsert these AREVA Advanced-Mark BW fuel assemblies back

Serial No: 16-274 Docket Nos.: 50-339 Response to RAI - COLR N2C25 Attachment; Page 2 of 2 into the core, if required. Once a sufficient number of Westinghouse RFA-2 fuel assemblies are stockpiled in the spent fuel pool, a license amendment request will be submitted to remove the AREVA methods from TS 5.6.5.b. Specifically, AREVA analytical methods in References 10 through 15 will be removed from TS 5.6.5.b list of COLR references.