ML071160429

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

ML071160429
Person / Time
Site:	Callaway
Issue date:	05/10/2007
From:	Donohew J NRC/NRR/ADRO/DORL/LPLIV
To:	Naslund C Union Electric Co
Donohew J N, NRR/DORL/LP4, 415-1307
References
GL-06-002, TAC MD9060
Download: ML071160429 (4)

Text

May 10, 2007 Mr. Charles D. Naslund Senior Vice President and Chief Nuclear Officer Union Electric Company Post Office Box 620 Fulton, MO 65251

SUBJECT:

CALLAWAY PLANT, UNIT 1 - CLOSEOUT LETTER FOR GENERIC LETTER 2006-02, GRID RELIABILITY AND THE IMPACT ON PLANT RISK AND THE OPERABILITY OF OFFSITE POWER (TAC NO. MD0960)

Dear Mr. Naslund:

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). The purpose of the GL is for NRC to obtain information from its licensees in the following four areas involving the grid at a nuclear power plant (NPP):

1. Use of protocols between the 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. (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 also issued a letter dated December 5, 2006 (ADAMS Accession No. ML063380308) with a request for additional information (RAI) regarding the resolution of GL 2006-02 to 63 of 65 holders of operating licenses for nuclear power reactors, including Union Electric Company (the licensee) for the Callaway Plant, Unit 1 (Callaway). The RAI letter requested licensees respond to questions in the following six 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 probability, and

C. D. Naslund (6) interface with transmission system operator during extended plant maintenance. Of the six questions attached to the NRCs RAI letter, the licensee was requested to address questions numbered 1, 4, and 5 for Callaway.

By letters dated March 31 (ULNRC-05270, ADAMS Accession Nos. ML061010664) and August 1, 2006 (ULNRC-05313, ADAMS Accession No. ML062140589), the licensee responded to the information requested in the GL. The information attached to the March 31, 2006, letter is not available to the public because the licensee has declared part of the information provided as sensitive and should be withheld from the public in accordance with Section 2.390 of Title 10 of the Code of Federal Regulations. The August 1, 2006, letter provided a non-sensitive version of the same information provided in the March 31, 2006, letter.

By the additional letter dated January 31, 2007 (ULNRC-05362, ADAMS Accession No. ML070380274), the licensee responded to the subsequent RAI letter dated December 5, 2006. Based on the information provided in these letters, the NRC staff has concluded that the licensee is complying with the NRC regulatory requirements governing electric power sources and associated personnel training, and considers the licensees response to GL 2006-02 to be complete, for Callaway.

Based on this, the subject TAC MD0960 is closed. If you have any questions with respect to this letter, contact me at 301-415-1307.

Sincerely,

/RA/

Jack Donohew, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-483 cc: See next page

ML061010664) and August 1, 2006 (ULNRC-05313, ADAMS Accession No. ML062140589), the licensee responded to the information requested in the GL. The information attached to the March 31, 2006, letter is not available to the public because the licensee has declared part of the information provided as sensitive and should be withheld from the public in accordance with Section 2.390 of Title 10 of the Code of Federal Regulations. The August 1, 2006, letter provided a non-sensitive version of the same information provided in the March 31, 2006, letter.

By the additional letter dated January 31, 2007 (ULNRC-05362, ADAMS Accession No. ML070380274), the licensee responded to the subsequent RAI letter dated December 5, 2006. Based on the information provided in these letters, the NRC staff has concluded that the licensee is complying with the NRC regulatory requirements governing electric power sources and associated personnel training, and considers the licensees response to GL 2006-02 to be complete, for Callaway.

Based on this, the subject TAC MD0960 is closed. If you have any questions with respect to this letter, contact me at 301-415-1307.

Sincerely,

/RA/

Jack Donohew, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-483 DISTRIBUTION:

PUBLIC LPLIV Reading cc: See next page RidsNrrDorl RidsNrrDorlLpl4 RidsNrrPMJDonohew RidsNrrLALFeizollahi RidsOgcRp RidsAcrsAcnwMailCenter RidsRegion4MailCenter RidsNrrDprPgcb (CJackson) JRobinson, PGCB RidsNrrDeEeeb (GWilson) MMcConnell, EEEB ACCESSION NO.: ML071160429 OFFICE NRR/LPL4/PM NRR/LPL4/LA PGCB/BC EEEB/BC NRR/LPL4/BC NAME JDonohew LFeizollahi CJackson GWilson THiltz DATE 5/4/07 5/3/07 5/8/07 5/9/07 5/10/07 Callaway Plant, Unit 1 cc:

Professional Nuclear Consulting, Inc. Mr. Dan I. Bolef, President 19041 Raines Drive Kay Drey, Representative Derwood, MD 20855 Board of Directors Coalition for the Environment John ONeill, Esq. 6267 Delmar Boulevard Pillsbury Winthrop Shaw Pittman LLP University City, MO 63130 2300 N. Street, N.W.

Washington, D.C. 20037 Mr. Lee Fritz, Presiding Commissioner Callaway County Court House Mr. Keith A. Mills, Supervising Engineer 10 East Fifth Street Regional Regulatory Affairs/Safety Analysis Fulton, MO 65151 AmerenUE P.O. Box 620 Mr. David E. Shafer Fulton, MO 65251 Superintendent, Licensing Regulatory Affairs U.S. Nuclear Regulatory Commission AmerenUE Resident Inspector Office P.O. Box 66149, MC 470 8201 NRC Road St. Louis, MO 63166-6149 Steedman, MO 65077-1302 Manager, Regulatory Affairs Mr. Les H. Kanuckel AmerenUE Manager, Quality Assurance P.O. Box 620 AmerenUE Fulton, MO 65251 P.O. Box 620 Fulton, MO 65251 Mr. Keith G. Henke, Planner Division of Community and Public Health Missouri Public Service Commission Office of Emergency Coordination Governor Office Building 930 Wildwood P.O. Box 570 200 Madison Street Jefferson City, MO 65102 Jefferson City, MO 65102-0360 Certrec Corporation Regional Administrator, Region IV 4200 South Hulen, Suite 630 U.S. Nuclear Regulatory Commission Fort Worth, TX 76109 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-4005 Director, Missouri State Emergency Management Agency Mr. H. Floyd Gilzow P.O. Box 116 Deputy Director for Policy Jefferson City, MO 65102-0116 Missouri Department of Natural Resources P.O. Box 176 Jefferson City, MO 65102-0176 Mr. Rick A. Muench President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation P.O. Box 411 Burlington, KA 66839 June 2006