ML071060269

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

ML071060269
Person / Time
Site:	Columbia
Issue date:	04/19/2007
From:	Lyon C NRC/NRR/ADRO/DORL/LPLIV
To:	Parrish J Energy Northwest
Lyon C Fred, NRR/DORL/LPL4, 301-415-2296
References
TAC MD0966
Download: ML071060269 (4)

Text

April 19, 2007 Mr. J. V. Parrish Chief Executive Officer Energy Northwest P.O. Box 968 (Mail Drop 1023)

Richland, WA 99352-0968

SUBJECT:

COLUMBIA GENERATING STATION - RESPONSE TO GENERIC LETTER 2006-02, GRID RELIABILITY AND THE IMPACT ON PLANT RISK AND THE OPERABILITY OF OFFSITE POWER (TAC NO. MD0966)

Dear Mr. Parrish:

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 Document Access and Management System (ADAMS) Accession No. ML060180352), to all holders of operating licenses for nuclear power reactors, except those who have permanently ceased operation 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 the following four areas:

(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 RA/RC 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 that licensees respond to questions in the following areas:

(1) Switchyard Minimum Voltage;

J. V. Parrish (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; and (6) Interface With Transmission System Operator During Extended Plant Maintenance.

By letters dated April 3, 2006 (ADAMS Accession No. ML061010040, non-publicly available),

June 15, 2006 (ADAMS Accession No. ML061780425), and January 25, 2007 (ADAMS Accession No. ML070370406), 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 regarding this matter, please contact me 301-415-2296.

Sincerely,

/RA/

Carl F. Lyon, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-397 cc: See next page

ML061010040, non-publicly available),

June 15, 2006 (ADAMS Accession No. ML061780425), and January 25, 2007 (ADAMS Accession No. ML070370406), 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 regarding this matter, please contact me 301-415-2296.

Sincerely,

/RA/

Carl F. Lyon, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-397 cc: See next page DISTRIBUTION:

PUBLIC RidsNrrDorlLpl4 RidsOgcRp LPLIV Reading RidsNrrLAJBurkhardt RidsRgn4MailCenter RidsAcrsAcnwMailCenter RidsNrrPMFLyon JRobinson, NRR RidsNrrDeEeeb RidsNrrDprPgcb ADAMS Accession No.: ML071060269 OFFICE LPL4/PM LPL4/LA EEEB/BC LPL4/BC NAME FLyon JBurkhardt GWilson THiltz DATE 4/18/07 4/18/07 4/18/07 4/19/07 Columbia Generating Station cc:

Chairman Technical Services Branch Chief Energy Facility Site Evaluation Council FEMA Region X P.O. Box 43172 130 228th Street, S.W.

Olympia, WA 98504-3172 Bothell, WA 98201-9796 Mr. Douglas W. Coleman (Mail Drop PE20) Regional Administrator, Region IV Manager, Regulatory Programs U.S. Nuclear Regulatory Commission Energy Northwest 611 Ryan Plaza Drive, Suite 400 P.O. Box 968 Arlington, TX 76011-4005 Richland, WA 99352-0968 Senior Resident Inspector Chairman U.S. Nuclear Regulatory Commission Benton County Board of Commissioners P.O. Box 69 P.O. Box 190 Richland, WA 99352-0069 Prosser, WA 99350-0190 Assistant Director Mr. William A. Horin, Esq. Nuclear Safety and Energy Siting Division Winston & Strawn Oregon Department of Energy 1700 K Street, N.W. 625 Marion Street NE Washington, DC 20006-3817 Salem, OR 97301-3742 Mr. Matt Steuerwalt Special Hazards Program Manager Executive Policy Division Washington Emergency Management Div.

Office of the Governor 127 W. Clark Street P.O. Box 43113 Pasco, WA 99301 Olympia, WA 98504-3113 Ms. Lynn Albin Washington State Department of Health P.O. Box 7827 Olympia, WA 98504-7827 April 2007