Letter Sequence Other |
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MONTHYEARML0633803172006-12-0505 December 2006
Enclosure 1 - Addressee List
Project stage: Request
ML0634604402006-12-13013 December 2006
Response Date for Request for Additional Information Regarding Resolution of Generic Letter 2006-02, Grid Reliability and the Impact on Plant Risk and the Operability of Offsite Power (TAC Nos. MD0947 Through MD1050)
Project stage: RAI
ML0703300512007-01-31031 January 2007
2 & 3; Sequoyah, Units 1 & 2 and Watts Bar, Unit 1 - Request for Additional Information Regarding Resolution of Generic Letter 2006-02, Grid Reliability and Impact on Plant Risk & Operability of Offsite Power
Project stage: Request
ML0703701932007-01-31031 January 2007
Response to Request for Additional Information Regarding Generic Letter 2006-02, Grid Reliability and the Impact on Plant Risk and the Operability of Offsite Power.
Project stage: Response to RAI
ML0710802252007-05-0303 May 2007
Response to Generic Letter 2006-02 Grid Reliability and the Impact on Plant Risk and the Operability of Offsite Power
Project stage: Other
2006-12-05
[Table View] |
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Category:Letter
MONTHYEARML23319A2452024-01-29029 January 2024
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CNL-24-016, Supplement to Application to Modify the Technical Specification Surveillance Requirement 3.9.5.1 (WBN-TS-21-14)2024-01-10010 January 2024
Supplement to Application to Modify the Technical Specification Surveillance Requirement 3.9.5.1 (WBN-TS-21-14)
CNL-23-052, Application to Adopt TSTF-427-A, Revision 2, Allowance for Non-Technical Specification Barrier Degradation on Supported System Operability2024-01-0909 January 2024
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ML23346A1382024-01-0303 January 2024
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CNL-23-069, Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation2023-12-21021 December 2023
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IR 05000390/20230102023-11-30030 November 2023
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Updated Inspection Plan for Watts Bar Nuclear Plant, Units 1 and 2 - Report 05000390/2023005 and 05000391/2023005
ML23233A0042023-08-28028 August 2023
Proposed Alternative to the Requirements of the ASME Boiler and Pressure Vessel Code for Upper Head Injection Dissimilar Metal Butt Welds
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Reissue - Watts Bar Nuclear Plant - Integrated Inspection Report 05000390/2023002 and 05000391/2023002
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2024-01-09
[Table view] |
Text
May 3, 2007 Mr. Preston D. Swafford Interim Chief Nuclear Officer Nuclear Support Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801
SUBJECT:
WATTS BAR NUCLEAR PLANT, UNIT 1 - RESPONSE TO GENERIC LETTER 2006-02 GRID RELIABILITY AND THE IMPACT ON PLANT RISK AND THE OPERABILITY OF OFFSITE POWER (TAC NO. MD1049)
Dear Mr. Swafford:
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 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 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
P. Swafford operating licenses for nuclear power reactors. The RAI requested 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. ML060950306), and January 31, 2007 (ADAMS Accession No. ML070330051), the Tennessee Valley Authority (TVA) responded to the information request of GL 2006-02 and the subsequent RAI, respectively. Based on the information provided, the staff has concluded that compliance is being maintained with NRC regulatory requirements governing electric power sources and associated personnel training and considers TVAs response to GL 2006-02 complete for the Watts Bar Nuclear Plant, Unit 1.
If you have any questions, please contact me 301-415-3974.
Sincerely,
/RA/
Brendan T. Moroney, Project Manager Plant Licensing Branch II-2 Division of Operating Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-390 cc: See next page
ML060950306), and January 31, 2007 (ADAMS Accession No. ML070330051), the Tennessee Valley Authority (TVA) responded to the information request of GL 2006-02 and the subsequent RAI, respectively. Based on the information provided, the staff has concluded that compliance is being maintained with NRC regulatory requirements governing electric power sources and associated personnel training and considers TVAs response to GL 2006-02 complete for the Watts Bar Nuclear Plant, Unit 1.
If you have any questions, please contact me 301-415-3974.
Sincerely,
/RA/
Brendan T. Moroney, Project Manager Plant Licensing Branch II-2 Division of Operating Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-390 cc: See next page Distribution:
PUBLIC LPL2-2 r/f RidsNrrLACSola RidsNrrPMBMoroney RidsNrrDorlLpl2-2 RidsOgcRp RidsAcrsAcnwMailCenter RidsRgn2MailCenter RidsNrrDeEeeb SCampbell, EDO, Region II JRobinson, NRR ADAMS ACCESSION NUMBER: ML071080225 OFFICE LPL2-2/PM LPL2-2/LA EEEB/BC LPL2-2/BC NAME BMoroney RSola GWilson TBoyce DATE 4/19/07 4/19/07 4/25/07 5/3/07
Mr. Preston D. Swafford Tennessee Valley Authority WATTS BAR NUCLEAR PLANT cc:
Mr. Ashok S. Bhatnagar, Senior Vice President Mr. James D. Smith, Acting Manager Nuclear Operations Licensing and Industry Affairs Tennessee Valley Authority Watts Bar Nuclear Plant 6A Lookout Place Tennessee Valley Authority 1101 Market Street P.O. Box 2000 Chattanooga, TN 37402-2801 Spring City, TN 37381 Mr. Larry S. Bryant, Vice President Mr. Michael J. Lorek, Plant Manager Nuclear Engineering & Technical Services Watts Bar Nuclear Plant Tennessee Valley Authority Tennessee Valley Authority 6A Lookout Place P.O. Box 2000 1101 Market Street Spring City, TN 37381 Chattanooga, TN 37402-2801 Senior Resident Inspector Mr. Michael D. Skaggs, Site Vice President Watts Bar Nuclear Plant Watts Bar Nuclear Plant U.S. Nuclear Regulatory Commission Tennessee Valley Authority 1260 Nuclear Plant Road P.O. Box 2000 Spring City, TN 37381 Spring City, TN 37381 County Executive General Counsel 375 Church Street Tennessee Valley Authority Suite 215 6A West Tower Dayton, TN 37321 400 West Summit Hill Drive Knoxville, TN 37902 County Mayor P. O. Box 156 Mr. John C. Fornicola, Manager Decatur, TN 37322 Nuclear Assurance Tennessee Valley Authority Mr. Lawrence E. Nanney, Director 6A Lookout Place Division of Radiological Health 1101 Market Street Dept. of Environment & Conservation Chattanooga, TN 37402-2801 Third Floor, L and C Annex 401 Church Street Mr. Robert H. Bryan, Jr., General Manager Nashville, TN 37243-1532 Licensing and Industry Affairs Tennessee Valley Authority Ms. Ann P. Harris 4X Blue Ridge 341 Swing Loop Road 1101 Market Street Rockwood, TN 37854 Chattanooga, TN 37402-2801 Ms. Beth A. Wetzel, Manager Corporate Nuclear Licensing and Industry Affairs Tennessee Valley Authority 4X Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801
