ML071210360
| ML071210360 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 05/08/2007 |
| From: | Balwant Singal NRC/NRR/ADRO/DORL/LPLII-1 |
| To: | Tynan T Southern Nuclear Operating Co |
| singal, balwant NRR/DORL 301-415-3016 | |
| References | |
| TAC MD1046, TAC MD1047 | |
| Download: ML071210360 (4) | |
Text
May 8, 2007 Mr. Tom E. Tynan Vice President - Vogtle Vogtle Electric Generating Plant 7821 River Road Waynesboro, GA 30830
SUBJECT:
VOGTLE ELECTRIC GENERATING PLANT, 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.
MD1046 AND MD1047)
Dear Mr.Tynan:
On February 1, 2006, the U.S. Nuclear Regulatory Commission (NRC) issued 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.
In GL 2006-02 (GL), 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 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 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
T. Tynan 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 March 31, 2006 (ADAMS Accession No. ML060900618), and January 30, 2007 (ADAMS Accession No. ML070300848), you responded to the information request of GL 2006-02 and the subsequent RAI, respectively. Based on the information you provided, the NRC 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/
Balwant K. Singal, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-424 and 50-425 cc: See next page
ML060900618), and January 30, 2007 (ADAMS Accession No. ML070300848), you responded to the information request of GL 2006-02 and the subsequent RAI, respectively. Based on the information you provided, the NRC 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/
Balwant K. Singal, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-424 and 50-425 cc: See next page DISTRIBUTION:
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ACCESSION NO.: ML071210360 OFFICE NRR/LPL2-1/PM NRR/LPL2-1/LA NRR/DE/EEEB/BC NRR/LPL2-1/BC NAME BSingal:nc MOBrien GWilson EMarinos DATE 5/4/07 5/4/07 5/8/07 5/8/07
Vogtle Electric Generating Plant, Units 1 & 2 cc:
Mr. Tom E. Tynan Vice President - Vogtle Vogtle Electric Generating Plant 7821 River Road Waynesboro, GA 30830 Mr. N. J. Stringfellow Manager, Licensing Southern Nuclear Operating Company, Inc.
P.O. Box 1295 Birmingham, AL 35201-1295 Mr. Jeffrey T. Gasser Executive Vice President Southern Nuclear Operating Company, Inc.
P.O. Box 1295 Birmingham, AL 35201-1295 Mr. Steven M. Jackson Senior Engineer - Power Supply Municipal Electric Authority of Georgia 1470 Riveredge Parkway, NW Atlanta, GA 30328-4684 Mr. Reece McAlister Executive Secretary Georgia Public Service Commission 244 Washington St., SW Atlanta, GA 30334 Mr. Harold Reheis, Director Department of Natural Resources 205 Butler Street, SE, Suite 1252 Atlanta, GA 30334 Attorney General Law Department 132 Judicial Building Atlanta, GA 30334 Mr. Laurence Bergen Oglethorpe Power Corporation 2100 East Exchange Place P.O. Box 1349 Tucker, GA 30085-1349 Arthur H. Domby, Esquire Troutman Sanders Nations Bank Plaza 600 Peachtree Street, NE Suite 5200 Atlanta, GA 30308-2216 Resident Inspector Vogtle Plant 8805 River Road Waynesboro, GA 30830 Office of the County Commissioner Burke County Commission Waynesboro, GA 30830