ML061030545
| ML061030545 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/13/2006 |
| From: | Grecheck E Dominion, Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 06-189, RG-1.174, RG-1.177 | |
| Download: ML061030545 (2) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY
- RICHMOND, VIRGINIA 23261 April 13, 2006 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Serial No.06-189 NLOS/ETS RO Docket Nos. 50-338 License Nos. NPF-4 50-339 NPF-7 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNITS 1 AND 2 WITHDRAWAL OF PROPOSED TECHNICAL SPECIFICATIONS CHANGE FOR SYSTEMS COMPLETION TIMES INCREASED ECCS-LHSI. AFW. QUENCH SPRAY AND CHEMICAL ADDITION In a December 17, 2004 letter (Serial No.04-381), as supplemented by letter dated October 7, 2005 (Serial No.05-553), Dominion requested amendments to Facility Operating License Numbers NPF-4 and NPF-7 in the form of changes to the Technical Specifications for North Anna Power Station Units 1 and 2. The proposed changes would increase the completion times for several safety systems from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 7 days. The proposed changes were based on a risk-informed evaluation performed in accordance with Regulatory Guides (RG) 1.1 74, An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions On Plant-Specific Changes to the Licensing Basis, and RG 1.1 77, An Approach for Plant-Specific, Risk-Informed Decisionmaking: Technical Specifications. Based upon issues identified by the NRC at a February 8, 2006 meeting, Dominion is withdrawing the proposed amendment request.
At the meeting, the NRC staff identified a number of risk-informed and deterministic justifications provided by proposed change. These specific issues included:
issues associated with the Dominion in support of the 0
Consideration of external events risk 0
Technical justification of the Tier 2 evaluation Determination of compensatory measures 0
Development and review of Tier 3 evaluations 0
Resolution of peer review comments on the PRA model It is Dominions intention to address the NRC issues identified in the meeting in a re-submittal. The re-submittal of the license amendment will be limited to just the completion time for an inoperable Low Head Safety Injection Subsystem (LHSI), based on the repetitive emergency TS changes that have been required the past few years for LHSI piping repairs.
Prior to re-submittal of a proposed amendment, Dominion plans to request a meeting with the NRC staff to discuss the revised approach.
Should you have any questions or require additional information, please contact Mr. Thomas Shaub at (804) 273-2763.
Very truly yours, V
Eugene S. Grecheck Vice President - Nuclear Support Services Commitments made in this letter: None 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 I nnsbrook Corporate Center 4201 Dominion Blvd.
Suite 300 Glen Allen, Virginia 23060 Co mmissio ner Bureau of Radiological Health 1500 East Main Street Suite 240 Richmond, Virginia 23218 Mr. J. T. Reece NRC Senior Resident Inspector North Anna Power Station Mr. S. R. Monarque NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North 11 555 Rockville Pike Mail Stop 8-Hi 2 Rockville, Maryland 20852