ML12321A102

Annual Submittal of Technical Specification Bases Changes Pursuant to Technical Specification 5.5.13.d

ML12321A102
Person / Time
Site:	North Anna
Issue date:	10/05/2012
From:	Garver R Virginia Electric & Power Co (VEPCO), Dominion
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
12-622
Download: ML12321A102 (5)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 October 5, 2012 U,S. Nuclear Regulatory Commission Serial No.12-622 Attention: Document Control Desk NAPS/JHL 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 I AND 2 ANNUAL SUBMITTAL OF TECHNICAL SPECIFICATION BASES CHANGES PURSUANT TO TECHNICAL SPECIFICATION 5.5.13.d Pursuant to Technical Specifications 5.5.13.d, "Technical Specifications (TS) Bases Control Program," Dominion hereby submits the changes to the Bases of the Technical Specifications implemented during the period of October 1, 2011 through September 30, 2012. A summary of these changes is provided in Attachment 1. Enclosed is an electronic copy (CD) of the entire TS Bases through Revision 48 for your information.

TS Bases changes that were submitted to the NRC for information along with the associated License Amendment Request transmittals, submitted pursuant to 10CFR50.90, were reviewed and approved by the Facility Safety Review Committee.

These changes have been implemented with the respective License Amendments. A summary of these changes is provided in Attachment 1.

If you have any questions regarding this submittal, please contact Mr. Page Kemp at (540) 894-2295.

Sincerely, R. M. Garver Director, Nuclear Safety and Licensing Attachment Enclosure - CD of Current TS Bases (Revision 48)

Commitments made in this letter: None AOD'

cc: U.S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Avenue, NE, Suite 1200 Atlanta, Georgia 30303-1257 Mr. J. E. Reasor, Jr. (without Enclosure)

Old Dominion Electric Cooperative Innsbrook Corporate Center 4201 Dominion Blvd.

Suite 300 Glen Allen, Virginia 23060 State Health Commissioner (without Enclosure)

Virginia Department of Health James Madison Building- 7th Floor 109 Governor Street Room 730 Richmond, Virginia 23219 Dr. V. Sreenivas NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 08 G-9A Rockville, Maryland 20852-2738 Ms. K. R. Cotton NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 08 G-9A Rockville, Maryland 20852-2738 NRC Senior Resident Inspector (without Enclosure)

North Anna Power Station

ATTACHMENT Serial No.12-622

SUMMARY

OF TS BASES CHANGES ASSOCIATED WITH LICENSE AMENDMENTS Virginia Electric and Power Company (Dominion)

North Anna Power Station Units 1 and 2

Summary of TS Bases Changes Associated with License Amendments Addition to Analytical Methodology to Core Operating Limits Report for Best Estimate Large Break Loss-of-Coolant Accident These amendments and Bases changes add a reference to Technical Specification (TS) 5.6.5.b, Core Operating Limits Report (COLR), to permit the use of the Westinghouse Best Estimate Large Break Loss-of-Coolant accident (BE-LOCA)

Evaluation Methodology using the Automated Statistical Treatment of Uncertainty Method (ASTRUM) for the analysis of LBLOCA at North Anna Units 1 and 2.

The TS Bases changes are made to differentiate the usage of accumulator water level (volume) between small break (SB) LOCA and LBLOCA methodologies. The SBLOCA methodologies use a nominal contained water volume. The best estimate or realistic LBLOCA methodologies sample the accumulator water volume over a given range.

The other Bases changes are to replace "10 CFR 50, Appendix K"with "10 CFR 50.46".

The use of 10 CFR 50.46 allows for the use of both best estimate LBLOCA and deterministic SBLOCA methodologies, since it invokes the requirements of Appendix K.

The Bases changes noted above were submitted to the NRC by Dominion submittals dated October 21, 2010, June 23, 2011 and August 22, 2011 and incorporated into the Bases on March 21, 2012 upon NRC approval and implementation of the associated Technical Specification changes (Amendments 267 for Unit 1 and 248 for Unit 2 issued on February 29, 2012).

Adoption of TSTF-513, Regarding Revision of Operability Requirements and Actions for Reactor Coolant System (RCS) Leakage Detection Instrumentation These amendments and Bases changes revise Technical Specification (TS) 3.4.15, RCS Leakage Detection Instrumentation. The amendments define a new time limit for restoring inoperable RCS leakage detection instrumentation to operable status and establish alternate methods of monitoring RCS leakage when one or more required leakage detection monitors are inoperable. The changes are consistent with NRC-approved Industry Technical Specification Task Force (TSTF) Standard Technical Specifications change TSTF-513, Revision 3.

The TS Bases are revised to clarify the specified safety function for each required instrument in the limiting condition for operation (LCO) Bases, delete discussion from the Bases that could be construed to alter the meaning of TS operability requirements, and reflect the changes made to TS 3.4.15.

Page 1 of 2

The Bases changes noted above were submitted to the NRC by Dominion submittal dated April 27, 2011 and incorporated into the Bases on November 1, 2011 upon NRC approval and implementation of the associated Technical Specification changes (Amendments 265 for Unit 1 and 246 for Unit 2 issued on September 28, 2011).

Page 2 of 2