ML072290531

Report on Results of Staff Audit of Corrective Actions to Address Generic Letter 2004-02

ML072290531
Person / Time
Site:	Millstone
Issue date:	08/30/2007
From:	Chernoff H NRC/NRR/ADRO/DORL/LPLI-2
To:	Christian D Dominion Nuclear Connecticut
Lamb John G./NRR/DORL, 415-3100
Shared Package
ML072290454	List: ML072290531 ML072290550
References
GL-04-002, GSI-191, TAC MC4694
Download: ML072290531 (4)

Text

August 30, 2007Mr. David A. ChristianSr. Vice President and Chief Nuclear Officer Dominion Nuclear Connecticut, Inc.

Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711

SUBJECT:

MILLSTONE POWER STATION, UNIT NO. 2: REPORT ON RESULTS OFSTAFF AUDIT OF CORRECTIVE ACTIONS TO ADDRESS GENERIC LETTER 2004-02 (TAC NO. MC4694)

Dear Mr. Christian:

Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency RecirculationDuring Design Basis Accidents at Pressurized-Water Reactors," requested that all pressurized-water reactor (PWR) licensees (1) evaluate the adequacy of the emergency sump recirculation function with respect to potentially adverse effects associated with post-accident debris, and (2) implement any plant modifications determined to be necessary. Dominion Nuclear Connecticut, Inc. (Dominion), the licensee, has conducted an evaluation of recirculation sump performance for Millstone Power Station, Unit No. 2 (Millstone Unit 2). Dominion has installed new sump strainers in Millstone Unit 2.Consistent with the discussion in the "Reasons for Information Request" section of GL 2004-02,the Nuclear Regulatory Commission (NRC) staff is using sample audits to help verify that addressees have resolved the concerns identified in the GL. The staff has conducted a detailed audit of the new sump strainer design and associated analyses and testing for Millstone Unit 2.The NRC previously forwarded the draft report to Dominion, and Dominion, after consultationwith its contractors and vendors for GL 2004-02 corrective actions, has confirmed that there is no proprietary information contained in the audit report.The enclosed audit report provides Dominion feedback on its GL 2004-02 corrective actionsand supporting analyses. Also, when made publically available, this audit report will serve as a vehicle to inform other PWR licensees of the NRC staff's technical positions on various aspectsof Generic Safety Issue 191, PWR Sump Performance.The enclosed audit report does not reach a conclusion regarding overall adequacy ofDominion's GL 2004-02 corrective actions. The NRC staff expects that Dominion's end-of-calendar year (CY) 2007 GL 2004-02 supplemental response will respond to the open items in the enclosed audit report. This expectation has been stated in public meetings with licensees and at the audit exit meeting for the Millstone Unit 2 audit. It is reinforced in a GL 2004-02 supplemental response content guide that the NRC staff released on D. Christian- 2 -August 15, 2007 (Agencywide Documents Access and Management System AccessionNo. ML071060091). In early CY 2008 NRC staff consideration of Dominion's end-of-CY 2007 GL 2004-02 supplemental response (including its response to audit open items) will result in a letter to Dominion assessing the overall adequacy of the Millstone Unit 2 GL 2004-02 corrective actions.The audit team did not evaluate whether the licensee has identified and/or submittedappropriate licensing documents for its GL 2004-02 corrective actions. The audit team did not evaluate the completeness of the licensee's implementation of GL 2004-02 corrective actions.

That is within the scope of the Reactor Oversight Program under Test Instruction 2515/166, "Pressurized Water Reactor Containment Sump Blockage."In conclusion, the NRC staff is appreciative of the licensee's support during all phases of theaudit and the assistance to the NRC staff of the Dominion GSI-191 Audit designated single point-of-contact during the preparation, conduct, and documentation phases of the audit. The staff also thanks Dominion for providing appropriate office space and facilitating the emergency core cooling system pump rooms tour taken by the audit team members.If you have any questions, please contact John Hughey, Project Manager, at (301) 415-3204.Sincerely, /ra/ (RBEnnis for)Harold K. Chernoff, ChiefPlant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No:50-336

Enclosure:

As stated cc w/encls:See next page D. Christian- 2 -August 15, 2007 (Agencywide Documents Access and Management System AccessionNo. ML071060091). In early CY 2008 NRC staff consideration of Dominion's end-of-CY 2007 GL 2004-02 supplemental response (including its response to audit open items) will result in a letter to Dominion assessing the overall adequacy of the Millstone Unit 2 GL 2004-02 corrective actions.The audit team did not evaluate whether the licensee has identified and/or submittedappropriate licensing documents for its GL 2004-02 corrective actions. The audit team did not evaluate the completeness of the licensee's implementation of GL 2004-02 corrective actions.

That is within the scope of the Reactor Oversight Program under Test Instruction 2515/166, "Pressurized Water Reactor Containment Sump Blockage."In conclusion, the NRC staff is appreciative of the licensee's support during all phases of theaudit and the assistance to the NRC staff of the Dominion GSI-191 Audit designated single point-of-contact during the preparation, conduct, and documentation phases of the audit. The staff also thanks Dominion for providing appropriate office space and facilitating the emergency core cooling system pump rooms tour taken by the audit team members.If you have any questions, please contact John Hughey, Project Manager, at (301) 415-3204.Sincerely, /ra/ (RBEnnis for)Harold K. Chernoff, ChiefPlant Licensing Branch I-2 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No:50-336

Enclosure:

As stated cc w/encls:See next pageDISTRIBUTION:JGollaMScottRidsNrrDssRidsNrrPMJHugheyRidsNrrPMJLambRidsNrrLAABaxterKManoly AMendiolaAHiserLWhitneyWRulandPackage.: ML072290454 Memo.: ML072290531 Enclosure.: ML07072290550 OFFICELPL1-2/PMLPL1-2/LALPL2-2/LASSIB/BCLPL1-2/BCNAMEJLambABaxterRSolaMScottHChernoff(RBEnnis for)DATE8/17/07 8 /30 /07 8 / 30 /07 8 / 29 /078/30/07OFFICIAL RECORD COPY Millstone Power Station, Unit No. 2 cc:

Lillian M. Cuoco, EsquireSenior Counsel Dominion Resources Services, Inc.

Building 475, 5 th FloorRope Ferry Road Waterford, CT 06385Edward L. Wilds, Jr., Ph.D.Director, Division of Radiation Department of Environmental Protection 79 Elm Street Hartford, CT 06106-5127Regional Administrator, Region IU.S. Nuclear Regulatory Commission

475 Allendale Road King of Prussia, PA 19406First SelectmenTown of Waterford 15 Rope Ferry Road Waterford, CT 06385Charles Brinkman, DirectorWashington Operations Nuclear Services Westinghouse Electric Company 12300 Twinbrook Pkwy, Suite 330 Rockville, MD 20852Senior Resident InspectorMillstone Power Station c/o U.S. Nuclear Regulatory Commission P.O. Box 513 Niantic, CT 06357Mr. J. Alan PriceSite Vice President Dominion Nuclear Connecticut, Inc.

Building 475, 5 th FloorRope Ferry Road Waterford, CT 06385Mr. J. W. "Bill" Sheehan Co-Chair NEAC 19 Laurel Crest Drive Waterford, CT 06385Mr. Evan W. WoollacottCo-Chair Nuclear Energy Advisory Council 128 Terry's Plain Road Simsbury, CT 06070Ms. Nancy Burton147 Cross Highway Redding Ridge, CT 00870Mr. Chris L. FunderburkDirector, Nuclear Licensing and Operations Support Dominion Resources Services, Inc.

Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711Mr. David W. DodsonLicensing Supervisor Dominion Nuclear Connecticut, Inc.

Building 475, 5 th FloorRope Ferry Road Waterford, CT 06385Mr. Joseph Roy, Director of Operations Massachusetts Municipal Wholesale Electric Company Moody Street P.O. Box 426 Ludlow, MA 01056