ML072390513

Response to Generic Letter 2006-02, Grid Reliability and the Impact on Plant Risk and the Operability of Offsite Power

ML072390513
Person / Time
Site:	Harris
Issue date:	09/07/2007
From:	Vaaler M NRC/NRR/ADRO/DORL/LPLII-2
To:	Duncan R Carolina Power & Light Co
Vaaler, Marlayna, NRR/DORL 415-1998
References
GL-06-002, TAC MD0986
Download: ML072390513 (5)

Text

September 7, 2007 Robert J. Duncan II, Vice President Shearon Harris Nuclear Power Plant Carolina Power & Light Company Post Office Box 165, Mail Code: Zone 1 New Hill, North Carolina 27562-0165

SUBJECT:

SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 - RESPONSE TO GENERIC LETTER 2006-02, GRID RELIABILITY AND THE IMPACT ON PLANT RISK AND THE OPERABILITY OF OFFSITE POWER (TAC NO. MD0986)

Dear Mr. Duncan:

On February 1, 2006, the U.S. Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 2006-02, Grid Reliability and the Impact on Plant Risk and the Operability of Offsite Power (Agencywide Documents Access and Management System (ADAMS) Accession No. ML060180352), to all holders of operating licenses for nuclear power reactors except those who have permanently ceased operations and have certified that fuel has been removed from the reactor vessel.

GL 2006-02 notified licensees of the NRC staffs need for information in four areas as follows:

(1) use of protocols between the nuclear power plant (NPP) and the transmission system operator (TSO), independent system operator (ISO), or reliability coordinator/authority (RC/RA) and the use of transmission load flow analysis tools (analysis tools) by TSOs to assist NPPs in monitoring grid conditions to determine the operability of offsite power systems under plant technical specifications (TSs). (The TSO, ISO, or RC/RA is responsible for preserving the reliability of the local transmission system. In this GL the term TSO is used to denote these entities);

(2) use of NPP/TSO protocols and analysis tools by TSOs to assist NPPs in monitoring grid conditions for consideration in maintenance risk assessments; (3) offsite power restoration procedures in accordance with Section 2 of NRC Regulatory Guide (RG) 1.155, Station Blackout; and (4) losses of offsite power caused by grid failures at a frequency equal to or greater than once in 20 site-years in accordance with RG 1.155.

R. Duncan Subsequent to the GL, the NRC issued a request for additional information (RAI), (ADAMS Accession No. ML063380308) regarding the resolution of GL 2006-02 to 63 of 65 holders of operating licenses for nuclear power reactors. The RAI requested licensees respond to questions in the following areas:

(1) Switchyard Minimum Voltage (2) Loss of Real-Time Contingency Analysis (RTCA) Capability (3) Verification of RTCA Predicted Post-Trip Voltage (4) Identification of Applicable Single Contingencies (5) Seasonal Variation in Grid Stress (reliability and Loss-of-offsite power (LOOP) Probability (6) Interface With Transmission System Operator During Extended Plant Maintenance By letters dated April 3, 2006 (ADAMS Accession No. ML061020109), and January 26, 2007 (ADAMS Accession No. ML070320562), you responded to the information request of GL 2006-02 and the subsequent RAI. Based on the information you provided, the staff has concluded that compliance is being maintained with NRC regulatory requirements governing electric power sources and associated personnel training and considers your response to GL 2006-02 complete.

If you have any questions, please contact me 301-415-3178.

Sincerely,

/RA/

Marlayna Vaaler, Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-400 cc: See next page

ML061020109), and January 26, 2007 (ADAMS Accession No. ML070320562), you responded to the information request of GL 2006-02 and the subsequent RAI. Based on the information you provided, the staff has concluded that compliance is being maintained with NRC regulatory requirements governing electric power sources and associated personnel training and considers your response to GL 2006-02 complete.

If you have any questions, please contact me 301-415-3178.

Sincerely,

/RA/

Marlayna Vaaler, Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-400 cc: See next page Distribution:

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Accession Number: ML072390513 NRR-106 OFFICE LPL2-2/PM LPL2-2/SR PM LPL2-2/LA EEEB/BC LPL2-2/BC NAME MVaaler/kac SBailey CSola GWilson TBoyce DATE 08/24/07 08/31/07 08/30/07 09/07/07 09/07/07 Shearon Harris Nuclear Power Plant, Unit 1 cc:

David T. Conley Mr. Robert P. Gruber Associate General Counsel II - Executive Director Legal Department Public Staff NCUC Progress Energy Service Company, LLC 4326 Mail Service Center Post Office Box 1551 Raleigh, North Carolina 27699-4326 Raleigh, North Carolina 27602-1551 Chairman of the North Carolina Resident Inspector/ Harris NPS Utilities Commission c/o U. S. Nuclear Regulatory Commission Post Office Box 29510 5421 Shearon Harris Road Raleigh, North Carolina 27626-0510 New Hill, North Carolina 27562-9998 Mr. Tony Gurley, Chair Ms. Margaret A. Force Board of County Commissioners Assistant Attorney General of Wake County State of North Carolina P. O. Box 550 Post Office Box 629 Raleigh, North Carolina 27602 Raleigh, North Carolina 27602 Mr. Carl Thompson, Chair Public Service Commission Board of County Commissioners State of South Carolina of Chatham County Post Office Drawer 11649 P. O. Box 87 Columbia, South Carolina 29211 Pittsboro, North Carolina 27312 Ms. Beverly Hall, Section Chief Mr. Thomas J. Natale, Manager Division of Radiation Protection Support Services N.C. Department of Environment Shearon Harris Nuclear Power Plant and Natural Resources Carolina Power & Light Company 3825 Barrett Drive P. O. Box 165, Mail Zone 1 Raleigh, North Carolina 27609-7721 New Hill, North Carolina 27562-0165 Mr. J. Paul Fulford Mr. David H. Corlett, Supervisor Manager, Performance Evaluation and Licensing/Regulatory Programs Regulatory Affairs PEB 5 Shearon Harris Nuclear Power Plant Carolina Power & Light Company Carolina Power & Light Company Post Office Box 1551 P. O. Box 165, Mail Zone 1 Raleigh, North Carolina 27602-1551 New Hill, NC 27562-0165 Mr. Chris L. Burton Mr. John H. ONeill, Jr.

Director of Site Operations Pillsbury Winthrop Shaw Pittman, LLP and Acting Plant General Manager 2300 N Street NW.

Shearon Harris Nuclear Power Plant Washington, DC 20037-1128 Carolina Power & Light Company Post Office Box 165, Mail Zone 1 New Hill, North Carolina 27562-0165