ML091880506
| ML091880506 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/06/2009 |
| From: | Price J A Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 09-389, GL-08-001 | |
| Download: ML091880506 (6) | |
Text
VIRGINIA ELI<:CTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 July 6, 2009 U.S.Nuclear Regulatory Commission Attention:
Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 Serial No.NLOS/ETS Docket No.License No.09-389 RO 50-338 NPF-4 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTHANNAPOWER STATION UNIT 1 SUPPLEMENTAL RESPONSE TO NRC GENERIC LETTER 2008*01.MANAGING GAS ACCUMULATION IN EMERGENCY CORE COOLING.DECAY HEAT REMOVAL.AND CONTAINMENT SPRAY SYSTEMS*INACCESSIBLE AREAS The Nuclear Regulatory Commission (NRC)issued Generic Letter (GL)2008-01 on January 11, 2008, to request that each licensee evaluate the licensing basis, design, testing, and corrective action programs for the Emergency Core Cooling Systems (ECCS), Residual Heat Removal (RHR)System, and Containment Spray (CS)System to ensure that gas accumulation is maintained less than the amount that could challenge operability of these systems, and that appropriate action is taken when conditions adverse to quality are identified.
In an October 14, 2008 letter (Serial No.08-00138), Dominion provided the information requested in GL 2008-01 for Surry and North Anna Power Stations.However, as identified in our May 8, 2008 letter (Serial No.08-0013A), Dominion provided an alternate schedule for the completion of the walkdowns and evaluations of the inaccessible portions of the ECCS and Spray Systems inside containment.
Specifically, Dominion committed to provide this information by January 15, 2009 for North Anna Unit 2 and July 15, 2009 for North Anna Unit 1.The NRC approved the completion schedule via letter dated July 23, 2008.Dominion completed the walkdowns for Unit 2 during the fall 2008 refueling outage and provided the evaluation results in a letter dated January 15, 2009 (Serial No.08-0013F).
The attachment to this letter provides the results of the walkdowns and evaluations of the inaccessible portion of the ECCS inside containment for North Anna Power Station Unit 1.Insummary,Dominion has concluded that: 1)the ECCS, RHR and containment spray systems at North Anna Power Station Unit 1 are in compliance with their TS definitions of operability, i.e., capable of performing their intended safety functions, and 2)North Anna Power Station is in compliance with 10 CFR 50, Appendix 8, Criterion III, V, XI, Serial No.09-389 Docket No.50-338 Page 2 of 3 XVI, and XVII, with respect to the concerns outlined in GL 2008-01 regarding gas accumulation in the applicable systems.Please contact Mr.Thomas Shaub at (804)273-2763 if you have any questions or require additional information.
Sincerely,\.J. rice
-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 J.Alan Price, 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 l.D-I-h day of_---=J'--u.=....-I--=I.d:;-I
, 2009.My Commission Expires:
..otarYPUblic CUJJ.a Commitments made in this letter: None
Attachment:
Supplemental Response to GL 2008-01-North Anna Power Station Unit 1 cc: U.S.Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, S.W., Suite 23T85 Atlanta, GA 30303-8931 NRC Senior Resident Inspector North Anna Power Station Mr.J.E.Reasor, Jr.Old Dominion Electric Cooperative Innsbrook Corporate Center 4201 Dominion Blvd.Suite 300 Glen Allen, Virginia 23060 Mr.J.F.Stang, Jr.NRC Project Manager U.S.Nuclear Regulatory Commission One White Fli nt North Mail Stop 08-G9A 11555 Rockville Pike Rockville, MD 20852-2738 Ms.D.N.Wright NRC Project Manager U.S.Nuclear Regulatory Commission One White Flint North Mail Stop 08-H4A 11555 Rockville Pike Rockville, MD 20852-2738 Serial No.09-389 Docket No.50-338 Page 3 of 3 ATTACHMENT NORTH ANNA POWER STATION UNIT 1 SUPPLEMENTAL RESPONSE TO GL 2008-01 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
Serial No.09-389 Docket No.50-338 Serial No.09-389 Docket No.50-338 Page 1 of 2 North Anna Unit 1 Nine-Month Supplemental Response to NRC Generic Letter 2008-01 This attachment provides the nine-month supplemental response to Generic Letter 2008-01 for actions that has been deferred until the next refueling outage for North AnnaUnit1 as requested in a May 8, 2008 letter (Serial No.08-0013A)and approved by the NRG in a July 23,2008 letter.The original conclusions regarding the licensing basis evaluation, testing evaluations, and corrective action evaluations have not changed from those conclusions documented in the initial response for North Anna Unit 1.This supplemental response provides the results of the design evaluation reviews conducted during the recent Unit 1 refueling outage associated with walkdowns of previously uncompleted activities.
A.EVALUATION RESULTS 1.DesignBasisDocuments No changes to licensing or design basis have been identified as a result of the confirmatory inspection or walkdown performed during the North Anna Power Station Unit 1 Refueling Outage.2.Confirmatory Walkdowns a)The Low Head Safety Injection cold leg piping inside containment was laser scanned and detailed isometrics prepared.A slope report was developed to identify high points in the piping.Each identified high point of greater than 1 degree was evaluated forpotentialgas accumulation.
The evaluated high points did not exceed previously determined acceptance criteria developed for this discharge piping.b)Venting was performed at the system piping high points outside of containment in accordance with existing station procedures for each EGGS system piping train upon return to service.Subsequent full flow testing and system flow sweeping was performed in accordance with existing station procedures to provide dynamic venting of the system high points both outside and inside containment for each EGGS system piping train.3.Vent Valves No new vent valve locations or modifications to existing vent valves have been identified by the confirmatory inspection or walkdown.
Serial No.09-389 Docket No.50-338 Page 2 of 2 4.Procedures No procedure revisions have been identified by the confirmatory inspection or walkdown.B.DESCRIPTION OF NECESSARY ADDITIONAL CORRECTIVE ACTIONS 1.Additional Corrective Actions No additional corrective actions are required as a result of the confirmatory inspections or walkdowns.
2.Corrective Action Updates No changes have been made to the previous corrective actions identified in Section C of Attachment 2 to Dominion's October 14, 2008 letter (Serial No.08-00138).
Conclusion Dominion has evaluated the previously unevaluated portions of the applicable systems at North Anna Station Power Station Unit 1 that perform the functions described in the Generic Letter 2008-01 and has concluded that these systems are operable.The original conclusions documented in the Dominion's response dated October 14, 2008 with respect to the licensing basis evaluation, testing evaluations, and corrective action evaluations have not changed.