ML071130261
| ML071130261 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  (NPF-087, NPF-089) |
| Issue date: | 04/27/2007 |
| From: | Thadani M NRC/NRR/ADRO/DORL/LPLIV |
| To: | Blevins M TXU Power |
| Thadani, M C, NRR/DORL/LP4, 415-1476 | |
| References | |
| GL-06-002, TAC MD0967, TAC MD0968 | |
| Download: ML071130261 (4) | |
Text
April 27, 2007 Mr. M. R. Blevins Senior Vice President &
Chief Nuclear Officer TXU Power Attn: Regulatory Affairs Department P. O. Box 1002 Glen Rose, TX 76043
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC 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. MD0967 AND MD0968)
Dear Mr. Blevins:
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 operation and have certified that fuel has been removed from the reactor vessel.
In GL 2006-02, the NRC staff notified the 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. (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 the 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
M. operating licenses for nuclear power reactors. The RAI requested that 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. ML061010635), June 29, 2006 (ADAMS Accession No. ML061870342), and January 29, 2007 (ADAMS Accession No. ML070370349),
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 with the NRC regulatory requirements governing electric power sources and associated personnel training is being maintained. Accordingly, the NRC staff considers your response to GL 2006-02 complete.
If you have any questions, please contact me at 301-415-1476.
Sincerely,
/RA/
Mohan C. Thadani, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-445 and 50-446 cc: See next page
ML061010635), June 29, 2006 (ADAMS Accession No. ML061870342), and January 29, 2007 (ADAMS Accession No. ML070370349),
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 with the NRC regulatory requirements governing electric power sources and associated personnel training is being maintained. Accordingly, the NRC staff considers your response to GL 2006-02 complete.
If you have any questions, please contact me at 301-415-1476.
Sincerely,
/RA/
Mohan C. Thadani, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-445 and 50-446 cc: See next page DISTRIBUTION:
PUBLIC LPLIV Reading RidsAcrsAcnwMailCenter RidsNrrDorlLpl4 JEargle, NRR RidsNrrPMMThadani RidsNrrLALFeizollahi RidsOgcRp RidsRgn4MailCenter ACCESSION NO: ML071130261 OFFICE NRR/LPL4/PM NRR/LPL4/PM NRR/LPL4/LA NRR/LPL4/BC NAME MThadani JEargle/MMarkley LFeizollahi THiltz/MMarkley DATE 4/25/07 4/27/07 4/26/07 4/27/07
December 2004 Comanche Peak Steam Electric Station cc:
Senior Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 2159 Glen Rose, TX 76403-2159 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 Mr. Fred W. Madden, Director Regulatory Affairs TXU Generation Company LP P.O. Box 1002 Glen Rose, TX 76043 George L. Edgar, Esq.
Morgan Lewis 1111 Pennsylvania Avenue, NW Washington, DC 20004 County Judge P.O. Box 851 Glen Rose, TX 76043 Environmental and Natural Resources Policy Director Office of the Governor P.O. Box 12428 Austin, TX 78711-3189 Mr. Richard A. Ratliff, Chief Bureau of Radiation Control Texas Department of Health 1100 West 49th Street Austin, TX 78756-3189 Mr. Brian Almon Public Utility Commission William B. Travis Building P.O. Box 13326 1701 North Congress Avenue Austin, TX 78701-3326 Ms. Susan M. Jablonski Office of Permitting, Remediation and Registration Texas Commission on Environmental Quality MC-122 P.O. Box 13087 Austin, TX 78711-3087 Terry Parks, Chief Inspector Texas Department of Licensing and Regulation Boiler Program P.O. Box 12157 Austin, TX 78711