ML071150025

RAI, Request for Additional Information Regarding the Proposal to Revise Technical Specification Surveillance Requirements (TAC Nos. MD3168 & MD3169)

ML071150025
Person / Time
Site:	Surry
Issue date:	05/03/2007
From:	Siva Lingam NRC/NRR/ADRO/DORL/LPLII-1
To:	Christian D Virginia Electric & Power Co (VEPCO)
Lingam, Siva NRR/DORL 415-1564
References
GL-04-002, TAC MD3168, TAC MD3169
Download: ML071150025 (4)

Text

May 3, 2007 Mr. David A. Christian Senior Vice President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711

SUBJECT:

SURRY POWER STATION, UNIT NOS. 1 AND 2, REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING THE PROPOSAL TO REVISE TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENTS FOR THE INSPECTION OF THE CONTAINMENT RECIRCULATION SUMP (TAC NOS. MD3168 AND MD3169)

Dear Mr. Christian:

By letter dated October 3, 2006, Virginia Electric and Power Company (the licensee) submitted a license amendment request regarding the revision of Technical Specification (TS)

Surveillance Requirements (SR) for the inspection of the containment recirculation sump. The proposed license amendment will revise the TS SR to: (1) change the required frequency of containment sump inspections, and (2) replace specific terminology associated with the existing sump screen design with generic terminology applicable to both the existing design and the replacement strainer being installed in response to the Nuclear Regulatory Commissions (NRCs) Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors. The NRC staff is reviewing the submittal and has determined that additional information is required to complete its evaluation.

The NRC staffs RAI is enclosed. The licensee is requested to provide a response to the RAI within 30 days.

Sincerely,

/RA/

Siva P. Lingam, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-280 and 50-281

Enclosure:

RAI cc: See next page

May 3, 2007 Mr. David A. Christian Senior Vice President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711

SUBJECT:

SURRY POWER STATION, UNIT NOS. 1 AND 2, REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING THE PROPOSAL TO REVISE TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENTS FOR THE INSPECTION OF THE CONTAINMENT RECIRCULATION SUMP (TAC NOS. MD3168 AND MD3169)

Dear Mr. Christian:

By letter dated October 3, 2006, Virginia Electric and Power Company (the licensee) submitted a license amendment request regarding the revision of Technical Specification (TS)

Surveillance Requirements (SR) for the inspection of the containment recirculation sump. The proposed license amendment will revise the TS SR to: (1) change the required frequency of containment sump inspections, and (2) replace specific terminology associated with the existing sump screen design with generic terminology applicable to both the existing design and the replacement strainer being installed in response to the Nuclear Regulatory Commissions (NRCs) Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors. The NRC staff is reviewing the submittal and has determined that additional information is required to complete its evaluation.

The NRC staffs RAI is enclosed. The licensee is requested to provide a response to the RAI within 30 days.

Sincerely,

/RA/

Siva P. Lingam, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-280 and 50-281

Enclosure:

RAI cc: See next page DISTRIBUTION:

Public RidsAcrsAcnwMailCenter RidsOgcRp LPL2-1 R/F RidsNrrDeEemb(KManoly) RidsRgn2MailCenter(EGuthrie)

RidsNrrDorlLpl2-1(EMarinos) RidsNrrLAMOBrien (hard copy)

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BSingal, DORL DPR ADAMS Accession No. ML071150025

• transmitted by memo dated. NRR-088 OFFICE NRR/LPL2-1/PM NRR/LPD2-1/LA NRR/DE/EEMB/BC NRR/LPL2-1/BC NAME SLingam:nc MOBrien KManoly EMarinos DATE 4/24/07 4/30/07 4/19/07* 5/3/07

OFFICIAL RECORD COPY REQUEST FOR ADDITIONAL INFORMATION REGARDING REVISION OF TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENTS AMENDMENT ASSOCIATED WITH CONTAINMENT SUMP SURRY POWER STATION, UNIT NOS. 1 AND 2 DOCKET NOS. 50-280 AND 50-281 In Attachment 1, Discussion of Change, Section 5.0, page 5 of 11 to the licensees letter dated October 3, 2006 (Agencywide Documents Access and Management System (ADAMS)

Accession No. ML062770208), the licensee stated that the modified sump strainer assemblies for recirculation spray and low head safety injection systems are designed to be mounted in a modular format on the containment floor around the containment sump. Each module contains a number of fins attached to the body of the module, and each module is bolted to the containment floor and connected to each other by flexible metal seals. The following additional information is requested.

1. Provide a simple sketch of the layout showing the arrangement for the existing and modified containment sump designs. What is the total strainer area of the modified sump strainer design compared with the total area of the existing sump strainer design?

2. Discuss the load components (such as dead weight load, debris loads, hydrodynamic mass, thermal, seismic load, loads due to differential pressure or head loss, loads due to any other dynamic effects, etc.) and load combinations that are used in the structural design of the modified modular sump strainer components and the floor-mounted bolted connections.

3. In reference to the calculation for the evaluation to establish the structural adequacy of the modified sump strainer assemblies, provide a summary of the structural adequacy evaluation of the modified sump strainer highlighting the design margins. Also, identify the design codes that were utilized in the structural design.

Regarding item No. 6 of the licensees letter dated March 28, 2007 (ADAMS Accession No. ML070871222), clarify whether the drawing reviews and evaluations performed to determine the absence of any missiles, high energy lines and associated dynamic effects due to pipe whip and jet impingement on the modified strainer assemblies are documented in calculations or reports. Provide references by citing the specific document and a summary of these evaluations.

Enclosure

Surry Power Station, Units 1 & 2 cc:

Mr. David A. Christian Office of the Attorney General Senior Vice President Commonwealth of Virginia and Chief Nuclear Officer 900 East Main Street Virginia Electrical and Power Company Richmond, Virginia 23219 Innsbrook Technical Center 5000 Dominion Boulevard Mr. Chris L. Funderburk, Director Glen Allen, VA 23060-6711 Nuclear Licensing & Operations Support Dominion Resources Services, Inc.

Ms. Lillian M. Cuoco, Esq. Innsbrook Technical Center Senior Counsel 5000 Dominion Blvd.

Dominion Resources Services, Inc. Glen Allen, Virginia 23060-6711 Building 475, 5th Floor Rope Ferry Road Waterford, Connecticut 06385 Mr. Donald E. Jernigan Site Vice President Surry Power Station Virginia Electric and Power Company 5570 Hog Island Road Surry, Virginia 23883-0315 Senior Resident Inspector Surry Power Station U. S. Nuclear Regulatory Commission 5850 Hog Island Road Surry, Virginia 23883 Chairman Board of Supervisors of Surry County Surry County Courthouse Surry, Virginia 23683 Dr. W. T. Lough Virginia State Corporation Commission Division of Energy Regulation Post Office Box 1197 Richmond, Virginia 23218 Dr. Robert B. Stroube, MD, MPH State Health Commissioner Office of the Commissioner Virginia Department of Health Post Office Box 2448 Richmond, Virginia 23218