ML071870152

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

ML071870152
Person / Time
Site:	Mcguire, McGuire
Issue date:	07/09/2007
From:	Stang J NRC/NRR/ADRO/DORL/LPLII-1
To:	Gordon Peterson Duke Power Co
Stang J, NRR/DORL, 415-1345
References
TAC MD0997, TAC MD0998
Download: ML071870152 (4)

Text

July 9, 2007 Mr. G. R. Peterson Vice President McGuire Nuclear Station Duke Power Company LLC 12700 Hagers Ferry Road Huntersville, NC 28078

SUBJECT:

MCGUIRE NUCLEAR STATION, UNITS 1 AND 2, RESPONSE TO GENERIC LETTER 2006-02, GRID RELIABILITY AND THE IMPACT ON PLANT RISK AND THE OPERABILITY OF OFFSITE POWER (TAC NOS. MD0997 AND MD0998)

Dear Mr. Peterson:

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.

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:

G. Peterson (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 March 30, 2006 (ADAMS Accession No. ML06102020168), and January 31, 2007 (ADAMS Accession No. ML070440175), 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 301-415-1345.

Sincerely,

/RA/

John Stang, Senior Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-369 and 50-370 cc: See next page

ML06102020168), and January 31, 2007 (ADAMS Accession No. ML070440175), 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 301-415-1345.

Sincerely,

/RA/

John Stang, Senior Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-369 and 50-370 cc: See next page Distribution:

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Accession Number: ML071870152 OFFICE NRR/LPL2-1/PM NRR/LPL2-1/LA NRR/LPL2-1/BC NAME JStang:nc MOBrien EMarinos DATE 7/9/07 7/9/07 7/9/07 McGuire Nuclear Station, Units 1 & 2 cc:

Vice President Manager McGuire Nuclear Station Nuclear Regulatory Issues &

Duke Power Company, LLC Industry Affairs 12700 Hagers Ferry Road Duke Energy Corporation Huntersville, NC 28078 526 S. Church St.

Mail Stop EC05P Associate General Counsel and Managing Charlotte, NC 28202 Attorney Duke Energy Carolinas, LLC Division of Radiation Protection 526 South Church Street - EC07H NC Dept of Environment, Health & Natural Charlotte, North Carolina 28202 Resources 3825 Barrett Dr.

County Manager of Mecklenburg County Raleigh, NC 27609-7721 720 E. Fourth St.

Charlotte, NC 28202 Owners Group (NCEMC)

Duke Energy Corporation Regulatory Compliance Manager 4800 Concord Road Duke Energy Corporation York, SC 29745 McGuire Nuclear Site 12700 Hagers Ferry Road Group Vice President, Nuclear Generation Huntersville, NC 28078 & Chief Nuclear Officer P.O. Box 1006-EC07H Senior Resident Inspector Charlotte, NC 28201-1006 U.S. Nuclear Regulatory Commission 12700 Hagers Ferry Road Senior Counsel Huntersville, NC 28078 Duke Energy Carolinas, LLC 526 South Church Street - EC07H Mecklenburg County Charlotte, NC 28202 Department of Environmental Protection 700 N. Tryon St Charlotte, NC 28202 Vice President Customer Relations and Sales Westinghouse Electric Company 6000 Fairview Road, 12th Floor Charlotte, NC 28210 NCEM REP Program Manager 4713 Mail Service Center Raleigh, NC 27699-4713 Assistant Attorney General NC Department of Justice P.O. Box 629 Raleigh, NC 27602